PLCγ2 deficiency compromises systemic immune tolerance and erodes myelin homeostasis while enhancing oxidative metabolism in the mouse brain

Probably not a substantial claim: may not pass S3 (load-bearing). May combine two claims.

Phosphoinositides including PIP2 are abundant in CNS myelin and have been implicated in myelin protein trafficking, cytoskeletal coupling, and paranodal organization.

“Beyond microglia, phosphoinositides including PIP2 are abundant in CNS myelin and have been implicated in myelin protein trafficking, cytoskeletal coupling, and paranodal organization [38–41]”

• cites [38] !!! INVALID CITATION !!! 37–39.Not matched

  Couldn’t be matched to a paper in Crossref, so it can’t be checked.

• cites [39] Erwig, M.S. , et al., Anillin facilitates septin assembly to prevent pathological outfoldings of central nervous system myelin. Elife, 2019. 8. sourcePartly supported

  The Results and discussion (page unavailable) report measuring PIP2 in purified CNS myelin and propose that PIP2–anillin interactions scaffold myelin through septin filaments, supporting the cytoskeletal-coupling part. The paper does not establish that phosphoinositides are abundant in CNS myelin, or implicate them directly in myelin protein trafficking or paranodal organization; its References list a separate study of PIP2 and myelin basic protein targeting. (LLM, conf=0.85)

  Experimental — accuracy not yet measured
• cites [40] Mironova, Y.A. , et al., PI(3,5)P2 biosynthesis regulates oligodendrocyte differentiation by intrinsic and extrinsic mechanisms. Elife, 2016. 5. sourcePartly supported

  The Discussion (page unavailable) identifies PI(3,5)P2 as important for trafficking myelin proteins through the endolysosomal system. Our copy does not establish that phosphoinositides, including PIP2, are abundant in CNS myelin or implicate them in cytoskeletal coupling or paranodal organization. (LLM, conf=0.86)

  Experimental — accuracy not yet measured
• cites [41] sourcePartly supported

  The Abstract and Discussion (pages unavailable) show that PIP2 helps target myelin basic protein to oligodendroglial membranes and is implicated in lipid sorting and myelin compaction. They do not establish that phosphoinositides are abundant in CNS myelin or link them to cytoskeletal coupling or paranodal organization. (LLM, conf=0.86)

  Experimental — accuracy not yet measured

May combine two claims.

PLCG2 gene expression in the mammalian brain is very low under physiological conditions, yet it is induced in AD brains and AD-like animal models.

“PLCG2 gene expression in the mammalian brain is very low under physiological conditions, yet it is induced in AD brains and AD-like animal models [12, 30].”

• cites [12] sourcePartly supported

  The Introduction states that PLCG2 expression increases in several brain regions in AD patients and in the 5xFAD mouse model; the Summary also describes induction in plaque-associated microglia. Our copy does not establish that PLCG2 gene expression is very low in the mammalian brain under physiological conditions. (LLM, conf=0.85)

  Experimental — accuracy not yet measured
• cites [30] sourceCould not verify

  The passages from the Introduction and the young-versus-old mouse-brain analysis address aging, not PLCG2 expression under physiological conditions or its induction in Alzheimer’s disease. Searches for PLCG2 and for AD brains or AD-like models found no passage addressing the claim; the indexed copy is truncated. (LLM, conf=0.70)

  Experimental — accuracy not yet measured

Probably not a substantial claim: may not pass S3 (load-bearing).

Multiple myelin-enriched lipid classes (such as galactosylceramides, sulfatides, and plasmalogens) are increasingly recognized as vulnerable nodes in AD.

“multiple myelin-enriched lipid classes (such as galactosylceramides, sulfatides, and plasmalogens) are increasingly recognized as vulnerable nodes in AD [42, 43].”

• cites [42] sourcePartly supported

  The paper reports substantial sulfatide depletion in very mild AD and identifies pGPEtn (a plasmalogen lipid) as another class with altered content (Abstract; page unavailable). But it reports no significant change in cerebrosides, which include galactosylceramides. It therefore does not support the claim for all three listed classes. (LLM, conf=0.88)

  Experimental — accuracy not yet measured
• cites [43] 2026, Spatial-temporal lipidomics reveals dysregulated lipid metabolism in mouse brain during Alzheimer’s disease progression, J Adv Res sourcePartly supported

  The Results report altered sulfatides and galactosylceramides in APP/PS1 mice, and the Discussion links these lipids to myelin. The paper therefore supports vulnerability of those classes in an AD mouse model, but the passages do not identify plasmalogens as another affected class; searches for plasmalogens and ether phosphatidylethanolamine found no such finding. (LLM, conf=0.86)

  Experimental — accuracy not yet measured

May combine two claims.

Within the brain, PLCγ2 is primarily but not exclusively expressed in microglia, where it serves as an important signaling node downstream of TREM2 and CD33.

“Within the brain, PLCγ2 is primarily but not exclusively expressed in microglia, where it serves as an important signaling node downstream of TREM2 and CD33 [31, 32], both also AD risk genes [33–35].”

• cites [31] 2020, Alzheimer’s-associated PLCgamma2 is a signaling node required for both TREM2 function and the inflammatory response in human microglia, Nat Neurosci sourceNot checked — no full text of the source
• cites [32] sourcePartly supported

  The section “Potential involvement of other AD risk genes in microglial function” says PLCG2 is preferentially expressed in microglia, and the table in “Human genetic evidence for microglia involvement in late-onset AD” places it downstream of SYK during ITAM signaling, consistent with the described TREM2 pathway. The paper instead describes CD33 as an inhibitory receptor that opposes ITAM receptors and SYK; it does not place PLCγ2 downstream of CD33. Page numbers are unavailable in our copy. (LLM, conf=0.88)

  Experimental — accuracy not yet measured
• cites [33] sourceSupported
• cites [34] sourceSupported
• cites [35] sourceNot checked — no full text of the source

Probably not a substantial claim: may not pass S3 (load-bearing).

The PLCG2 M28L variant confers a modest increased risk of AD (OR ≈ 1.16).

“other rare PLCG2 variants, such as M28L (rs61749044) that confers a modest increased risk of AD (OR ≈ 1.16) [1, 4, 7–13]”

• cites [1] sourceCould not verify

  The paper’s Abstract reports an association for a different PLCG2 variant, p.P522R, with decreased late-onset AD risk (OR=0.68). Searches for M28L, rs61749044, and an OR of 1.16 found no passage addressing the claimed variant or its risk estimate; the result for p.P522R does not establish what M28L does. (LLM, conf=0.75)

  Experimental — accuracy not yet measured
• cites [4] sourceCould not verify

  The Results (‘Association with brain diseases’; page unavailable) report reduced AD risk for a different PLCG2 variant, rs72824905-G (OR = 0.57). Searches for M28L, rs61749044, and Met28Leu found no passage in our copy addressing that variant or an AD odds ratio of approximately 1.16. The result for a different variant does not contradict the claim about M28L. (LLM, conf=0.76)

  Experimental — accuracy not yet measured
• cites [7] sourceCould not verify

  The Results section (page not available) reports AD associations for PLCG2 rs72824905-G, not M28L (rs61749044). Searches for M28L, rs61749044, and an AD odds ratio of approximately 1.16 found no passage addressing the claimed variant, so this copy cannot verify its reported risk. (LLM, conf=0.76)

  Experimental — accuracy not yet measured
• cites [8] 2020, PLCG2 protective variant p.P522R modulates tau pathology and disease progression in patients with mild cognitive impairment, Acta Neuropathol sourceCould not verify

  The Introduction discusses the protective PLCG2 variant p.P522R, and the Methods > Genotyping section describes testing that variant. Searches for M28L, rs61749044, and an odds ratio of 1.16 found no passage in our copy addressing the claimed risk association. The finding about p.P522R does not establish or contradict a claim about M28L. (LLM, conf=0.75)

  Experimental — accuracy not yet measured
• cites [9] 2023, Novel Genetic Variants in TP37, PIK3R1, CALM1, and PLCG2 of the Neurotrophin Signaling Pathway Are Associated with the Progression from Mild Cognitive Impairment to Alzheimer’s Disease, J Alzheimers Dis sourceCould not verify

  The Results section discusses two other PLCG2 variants, rs4073828 and rs4369658, and mentions five previously reported AD-associated variants without identifying M28L. Searches for M28L, rs61749044, and an odds ratio near 1.16 found no passage in our copy supporting the specific claim. (LLM, conf=0.76)

  Experimental — accuracy not yet measured
• cites [10] 2018, GWAS on family history of Alzheimer’s disease, Transl Psychiatry sourcePartly supported

  The Results section (‘Novel genome-wide significant loci’; page unavailable) identifies a PLCG2 locus associated with Alzheimer’s disease, but its reported SNP is rs12444183. Our copy does not identify M28L (rs61749044) or report an odds ratio of approximately 1.16 for it, so the variant-specific risk claim is not supported by this source. (LLM, conf=0.82)

  Experimental — accuracy not yet measured
• cites [11] sourceCould not verify

  The Results (Meta-GWAS of AD; page unavailable) report an association for a different PLCG2 variant, rs3935877 (OR 0.92). Searches for M28L, p.Met28Leu, and rs61749044 found no passage in our copy reporting an AD-risk estimate for the claimed variant. The different variant’s result neither verifies nor contradicts the claim about M28L. (LLM, conf=0.72)

  Experimental — accuracy not yet measured
• cites [12] sourceSupported
• cites [13] 2020, Examination of the Effect of Rare Variants in TREM2, ABI3, and PLCG2 in LOAD Through Multiple Phenotypes, J Alzheimers Dis sourceCould not verify

  The Methods and Results passages discuss PLCG2 p.P522R, not M28L (rs61749044). Searches for M28L and OR 1.16 found no passage in our copy addressing the claimed risk estimate; the protective finding for p.P522R concerns a different variant. (LLM, conf=0.76)

  Experimental — accuracy not yet measured

Probably not a substantial claim: may not pass S3 (load-bearing).

The TREM2-PLCγ2 signaling axis has been proposed to regulate phagocytosis, secretion of cytokines and chemokines, cell survival and proliferation in microglia.

“The TREM2-PLCγ2 signaling axis has been proposed to regulate phagocytosis, secretion of cytokines and chemokines, cell survival and proliferation in microglia [17, 36, 37].”

• cites [17] 2020, The Alzheimer’s disease-associated protective Plcgamma2-P522R variant promotes immune functions, Mol Neurodegener sourcePartly supported

  The Findings (page not provided) identify PLCγ2 as part of TREM2 signaling in microglia and link that pathway to phagocytosis and cell survival. They also discuss proliferation through downstream signaling, but describe cytokine secretion in macrophages as occurring apart from TREM2-dependent signaling; they do not establish chemokine secretion through the TREM2–PLCγ2 axis. (LLM, conf=0.85)

  Experimental — accuracy not yet measured
• cites [36] sourcePartly supported

  The introductory passage (listed under Abstract; page unavailable) links TREM2 to phagocytosis and inflammatory cytokine production, and Results and Discussion reports altered inflammatory-cytokine transcripts in TREM2-deficient mice. The paper identifies DAP12 as TREM2’s adaptor but does not establish a TREM2–PLCγ2 axis or its proposed roles in chemokine secretion, microglial survival, and proliferation; survival is raised only as a possible explanation for reduced macrophage accumulation. (LLM, conf=0.87)

  Experimental — accuracy not yet measured
• cites [37] sourcePartly supported

  The Introduction and Discussion link TREM2–PLCγ2 signalling to phagocytosis and cell survival in microglia-related models. The Results and Discussion discuss cytokine secretion in connection with PLCγ2 and other inflammatory pathways, but do not establish it as a TREM2–PLCγ2 function; the supplied copy likewise does not link this axis to chemokine secretion or proliferation. Page numbers were not provided. (LLM, conf=0.88)

  Experimental — accuracy not yet measured

Classified as probably not a substantial claim. May combine two claims.

Age-associated B cells (ABCs; CD11c+T-bet+) and regulatory T cells (Tregs) are key regulators of immune tolerance in aging, and their expansion or loss, respectively, has been implicated in age-related autoimmunity and chronic inflammation.

“Age-associated B cells (ABCs; CD11c+T-bet+) and regulatory T cells (Tregs) are key regulators of immune tolerance in aging, and their expansion or loss, respectively, has been implicated in age-related autoimmunity and chronic inflammation [25–29].”

• cites [25] sourcePartly supported

  The sections on ABC characteristics and accumulation with age (page not provided) identify CD11c-positive, T-bet-dependent ABCs and link their accumulation to aging and autoimmunity. The paper does not establish that ABCs are key regulators of immune tolerance, and the passages found do not address Tregs or the effects of Treg loss. It suggests that elevated inflammatory cytokines may promote ABC expansion, rather than establishing that ABC expansion causes chronic inflammation. (LLM, conf=0.88)

  Experimental — accuracy not yet measured
• cites [26] sourcePartly supported

  The Introduction and “Frequency of ABCs is increased during autoimmunity” sections identify ABCs using T-bet and CD11c and report their expansion with aging and in autoimmune disease. The “ABCs and tolerance” section discusses possible protective as well as pathogenic roles, but does not establish ABCs as key regulators of tolerance in aging. The copy does not support the claim about age-related Treg loss or its link to chronic inflammation; a reference title mentions regulatory T cells in patients with common variable immunodeficiency, not aging. (LLM, conf=0.88)

  Experimental — accuracy not yet measured
• cites [27] 2022, The dark side of Tregs during aging, Front Immunol sourcePartly supported

  The Introduction and Conclusion describe Tregs as regulators that restrain autoreactive responses, and the Conclusion says too few Tregs can lead to autoimmune responses. But the paper reports Treg accumulation with age, not a general loss, and the passages do not support the claim about expansion of CD11c+T-bet+ age-associated B cells or its link to chronic inflammation. (LLM, conf=0.88)

  Experimental — accuracy not yet measured
• cites [28] sourceNot checked — no full text of the source
• cites [29] sourcePartly supported

  The Loss of proteostasis section (p. 4) links loss of intestinal Tregs to systemic inflammation in autophagy-deficient models, supporting part of the claim about Tregs and immune tolerance. But the review does not address CD11c+T-bet+ age-associated B cells, and Lack of effector plasticity (p. 7) says Treg numbers increase—not decrease—in aged mice, although their suppressive function declines. (LLM, conf=0.86)

  Experimental — accuracy not yet measured

May combine two claims.

PLCγ2 is primarily expressed in lymphoid tissue (bone marrow, thymus, spleen and lymph nodes), where it functions immediately downstream of the B-cell receptor (BCR) and other ITAM-coupled receptors.

“PLCγ2 is primarily expressed in lymphoid tissue (bone marrow, thymus, spleen and lymph nodes), where it functions immediately downstream of the B-cell receptor (BCR) and other ITAM-coupled receptors [22–24].”

• cites [22] sourceNot checked — no full text of the source
• cites [23] sourcePartly supported

  The Introduction says PLCγ2 expression is restricted to the hematopoietic system, and the Results identify it in thymic and splenic T cells; neither passage establishes primary expression across the four listed tissues. The Abstract says PLCγ2 is critical for BCR signal transduction, but our copy does not establish that it functions immediately downstream of the BCR and other ITAM-coupled receptors. (LLM, conf=0.84)

  Experimental — accuracy not yet measured
• cites [24] 2024, Characterisation of molecular mechanisms for PLCgamma2 disease-linked variants, Adv Biol Regul sourcePartly supported

  The Introduction (page not provided) says PLCγ2 is expressed at high levels in immune cells and is linked to ITAM-associated receptors, including the BCR. It does not establish that PLCγ2 is primarily expressed in lymphoid tissue or specify the bone marrow, thymus, spleen and lymph nodes as its principal sites of expression. (LLM, conf=0.86)

  Experimental — accuracy not yet measured

May combine two claims.

The Betsholtz lab vascular atlas shows highest Plcg2 expression in microglia, followed by arterial endothelial cells.

“The Betsholtz lab vascular atlas shows highest Plcg2 expression in microglia, followed by arterial endothelial cells, highlighting putative roles at the blood-brain and perivascular interfaces [72].”

• cites [72] 2018, Single-cell RNA sequencing of mouse brain and lung vascular and vessel-associated cell types, Sci Data sourcePartly supported

  The Background & Summary (page unavailable) describes a searchable vascular atlas with microglia and arterial endothelial cell clusters, and says the database displays gene expression across cell types. Our copy does not state the claimed Plcg2 expression ranking; searches for “Plcg2” and the cell-type comparison found no passage establishing it. (LLM, conf=0.82)

  Experimental — accuracy not yet measured

Probably not a substantial claim: may not pass S3 (load-bearing). May combine two claims.

In the DropViz adult mouse brain atlas, the top ten Plcg2-expressing clusters are classified as microglia/macrophages and endothelial cells, with the strongest expression in microglia/macrophage clusters marked by Tmem119-Mrc1 and C1qb.

“Virtually identical expression patterns are observed in the DropViz adult mouse brain atlas, where the top ten Plcg2-expressing clusters are classified as microglia/macrophages and endothelial cells, with the strongest expression in microglia/macrophage clusters marked by Tmem119-Mrc1 and C1qb [73].”

• cites [73] sourcePartly supported

  The Introduction (page unavailable) identifies the adult mouse brain cell atlas, and the STAR Methods (page unavailable) list microglia/macrophage and endothelial cell classes. But the passages found for Plcg2, Tmem119, Mrc1, and C1qb do not report the top-ten Plcg2-expressing clusters or their relative expression, so the specific ranking and marker claim is not supported by our copy. (LLM, conf=0.82)

  Experimental — accuracy not yet measured

May combine two claims.

In the Aging Mouse Brain Single Cell Portal, Plcg2 expression is highest in microglia and brain macrophages, with lower levels in endothelial cells and oligodendrocyte precursor cells and minimal to no expression in neurons, astrocytes, and mature oligodendrocytes.

“In the Aging Mouse Brain Single Cell Portal, Plcg2 expression is highest in microglia and brain macrophages, with lower levels in endothelial cells and oligodendrocyte precursor cells and minimal to no expression in neurons, astrocytes, and mature oligodendrocytes [30, 72–74].”

• cites [30] sourceCould not verify

  The Identification of cell types section (page unavailable) describes microglia, macrophages, endothelial cells, oligodendrocyte precursors, neurons, astrocytes, and oligodendrocytes in the dataset. Searches for “Plcg2” and “Single Cell Portal” found no passage in our copy reporting the claimed expression pattern. The copy is truncated, so the claim cannot be verified from it. (LLM, conf=0.69)

  Experimental — accuracy not yet measured
• cites [72] 2018, Single-cell RNA sequencing of mouse brain and lung vascular and vessel-associated cell types, Sci Data sourceCould not verify

  The Background & Summary describes a searchable database of adult mouse brain vascular and vessel-associated cells, but does not report Plcg2 expression or identify the Aging Mouse Brain Single Cell Portal. Searches for “Plcg2” and the portal name found no passage establishing the claimed ranking across cell types. (LLM, conf=0.73)

  Experimental — accuracy not yet measured
• cites [73] sourceCould not verify

  The Introduction describes an adult mouse brain cell atlas, and STAR Methods specifies mice aged 60–70 days; neither passage identifies the Aging Mouse Brain Single Cell Portal. Searches for Plcg2, phospholipase C gamma 2, and the portal found no passage reporting the claimed expression pattern across cell types. (LLM, conf=0.74)

  Experimental — accuracy not yet measured
• cites [74] sourceNot checked — no full text of the source

May combine two claims.

Treg depletion is expected to promote a chronic low-grade inflammatory milieu characterized by elevated interferon γ, and such a cytokine environment is well-suited to sustain T-bet+ ABC-like populations.

“their depletion is expected to promote a chronic low-grade inflammatory milieu characterized by elevated interferon γ [69], such a cytokine environment is well-suited to sustain T-bet+ ABC-like populations [70].”

• cites [69] sourcePartly supported

  The Abstract and Discussion report that Tregs suppress IFN-γ and that IFN-γ can be produced rapidly after Treg depletion. They address acute cytokine regulation, not a chronic low-grade inflammatory milieu. The ABC-like population claim is attached to a different citation and is not assessed here. (LLM, conf=0.86)

  Experimental — accuracy not yet measured
• cites [70] sourceNot checked — no full text of the source

• AssumptionRests on an assumption: Regulatory T cells serve as key brakes on age- and autoimmunity-associated immune activation.

May combine two claims.

Human genetic studies have identified a nonsynonymous PLCG2 variant (rs72824905-G) that confers reduced risk of AD, dementia with Lewy bodies, and frontotemporal dementia while increasing the likelihood of longevity.

“Human genetic studies have identified a nonsynonymous PLCG2 variant (rs72824905-G) that confers reduced risk of AD, dementia with Lewy bodies, and frontotemporal dementia while increasing the likelihood of longevity, highlighting PLCG2 as a candidate therapeutic target [4].”

• cites [4] sourceSupported

Probably not a substantial claim: may not pass S3 (load-bearing). May combine two claims.

Prior work shows that loss of PLCγ2 can increase NF-κB signaling while reducing activation of the IRF3 pathway in PLCγ2-deficient macrophages.

“prior work showing that loss of PLCγ2 can increase NF-κB signaling while reducing activation of the interferon regulatory factor 3 (IRF3) pathway in PLCγ2-deficient macrophages [75]”

• cites [75] sourceSupported

Probably not a substantial claim: may not pass S3 (load-bearing).

In demyelinating and dysmyelinating models, phosphoinositide distributions within white matter tracts are altered.

“In demyelinating and dysmyelinating models, phosphoinositide distributions within white matter tracts are altered [85–87]”

• cites [85] Garcia-Dominguez, M ., White Matter in Crisis: Oligodendrocytes and the Pathophysiology of Multiple Sclerosis. Cells, 2025. 14(18). sourceCould not verify

  The Introduction describes demyelinated plaques in white matter, but does not discuss phosphoinositide distributions. Searches for “phosphoinositide” and for lipid distribution in dysmyelinating models found only a mention of phosphoinositide 3-kinase in a therapeutic table (Section 4.3, page unavailable), not the claimed change within white matter tracts. (LLM, conf=0.76)

  Experimental — accuracy not yet measured
• cites [86] 2025, Spatial lipidomics reveals demyelination and remyelination dynamics in the mouse brain, J Lipid Res sourcePartly supported

  The Results section (page not provided) reports increased phosphatidylinositol (PI) species in the corpus callosum during cuprizone-induced demyelination, supporting altered PI distribution in a white-matter tract. It does not report findings from a dysmyelinating model, and its measurements of PI species do not establish altered distributions of phosphorylated phosphoinositides. (LLM, conf=0.85)

  Experimental — accuracy not yet measured
• cites [87] 2024, Infrared spectral profiling of demyelinating activity in multiple sclerosis brain tissue, Acta Neuropathol Commun sourcePartly supported

  The Results section reports reduced phosphate signals in demyelinated MS white matter, and the Discussion interprets these as likely reflecting phospholipid changes. The paper does not identify phosphoinositide distributions specifically or establish the claim for demyelinating and dysmyelinating models; it examines MS brain tissue. (LLM, conf=0.86)

  Experimental — accuracy not yet measured

Probably not a substantial claim: may not pass S3 (load-bearing). May combine two claims.

Ferritin heavy chain-mediated iron delivery and storage are critical for oligodendrocyte iron metabolism and myelin lipid synthesis, helping to constrain iron-driven lipid peroxidation and ferroptotic death in white matter.

“ferritin heavy chain–mediated iron delivery and storage are critical for oligodendrocyte iron metabolism and myelin lipid synthesis, helping to constrain iron-driven lipid peroxidation and ferroptotic death in white matter [88, 89]”

• cites [88] sourcePartly supported

  The “Ferritin in iron homeostasis” section says heavy-chain ferritin is required for iron loading and helps quench oxidative stress. The paper also describes ferritin limiting lipid peroxidation in a macrophage-related context. It does not establish the claimed role in oligodendrocyte iron metabolism, myelin lipid synthesis, or prevention of ferroptotic death in white matter. (LLM, conf=0.87)

  Experimental — accuracy not yet measured
• cites [89] sourcePartly supported

  The H-Ferritin section describes FTH as an iron-delivery and storage protein for oligodendrocytes, explains that storage limits formation of harmful reactive oxygen species, and reports reduced myelin lipids when FTH levels are low. It does not establish the more specific claim that FTH constrains lipid peroxidation or ferroptotic death in white matter (searched: “lipid peroxidation” and “ferroptosis”). (LLM, conf=0.87)

  Experimental — accuracy not yet measured

Probably not a substantial claim: may not pass S3 (load-bearing).

CD11c+ microglia have been implicated in myelin development and repair.

“CD11c+ microglia have been implicated in myelin development and repair [79, 84]”

• cites [79] sourceSupported
• cites [84] 2023, CD11c(+) microglia promote white matter repair after ischemic stroke, Cell Death Dis sourceSupported

Probably not a substantial claim: may not pass S3 (load-bearing).

The Phyh-encoded peroxisomal enzyme phytanoyl-CoA 2-hydroxylase supports α-oxidation of 3-methyl branched-chain fatty acids such as phytanic acid, a peroxisomal processing step that is particularly important in lipid-rich, myelinated tissues.

“the Phyh-encoded peroxisomal enzyme phytanoyl-CoA 2-hydroxylase supports α-oxidation of 3-methyl branched-chain fatty acids such as phytanic acid, a peroxisomal processing step that is particularly important in lipid-rich, myelinated tissues [90].”

• cites [90] sourcePartly supported

  Split into 2 atoms — 1 confirmed, 1 partially supported, 0 disputed, 0 misattributed, 0 unverifiable. Expand the claim to see per-atom verdicts.

  Experimental — accuracy not yet measured

Probably not a substantial claim: may not pass S3 (load-bearing).

CD11c+ microglia are known to increase in chronic inflammatory and neurodegenerative conditions as well as during development.

“CD11c+ microglia are known to increase in chronic inflammatory and neurodegenerative conditions as well as during development [76–83]”

• cites [76] sourceCould not verify

  The Discussion (page unavailable) mentions a CD11c+ promoter only in describing preliminary transgenic-mouse experiments; it does not report an increase in CD11c+ microglia. The paper discusses microglial changes in EAE, but the passages found do not address CD11c+ microglia increasing across chronic inflammatory or neurodegenerative conditions or during development (searched: CD11c and developmental and disease terms). (LLM, conf=0.76)

  Experimental — accuracy not yet measured
• cites [77] sourceNot checked — no full text of the source
• cites [78] sourceSupported
• cites [79] sourceSupported
• cites [80] sourcePartly supported

  The Results section on disease-associated microglia (page unavailable) reports upregulation of Itgax, the gene encoding CD11c, in mouse models of ALS, Alzheimer’s disease, and multiple sclerosis. It does not show that the number of CD11c+ microglia increases, or report such an increase during development. (LLM, conf=0.83)

  Experimental — accuracy not yet measured
• cites [81] sourceNot checked — no full text of the source
• cites [82] sourcePartly supported

  The Results (page unavailable) identify CD11c as a marker of disease-associated microglia and report more CD11c-positive microglia in an Alzheimer’s mouse model than in wild-type mice. This supports the neurodegenerative-condition part of the claim, but our copy does not establish that CD11c-positive microglia increase during development or in chronic inflammatory conditions. (LLM, conf=0.85)

  Experimental — accuracy not yet measured
• cites [83] Shen, X. , et al., Definition of a mouse microglial subset that regulates neuronal development and proinflammatory responses in the brain. Proc Natl Acad Sci U S A, 2022. 119(8). sourcePartly supported

  The Results section reports that CD11c+ microglia increase shortly after birth, and the Abstract identifies them in mouse models of neurodegenerative disease. The paper does not establish that their numbers increase in chronic inflammatory conditions; its Results instead show that inflammatory activating stimuli did not induce CD11c expression in CD11c− microglia. (LLM, conf=0.87)

  Experimental — accuracy not yet measured

Probably not a substantial claim: may not pass S3 (load-bearing).

CPT1A catalyzes the rate-limiting formation of long-chain acylcarnitines at the outer mitochondrial membrane, thereby governing entry of long-chain fatty acids into the β-oxidation pathway.

“CPT1A catalyzes the rate-limiting formation of long-chain acylcarnitines at the outer mitochondrial membrane, thereby governing entry of long-chain fatty acids into the β-oxidation pathway [91]”

• cites [91] sourceSupported

Probably not a substantial claim: may not pass S3 (load-bearing).

HADHA is the catalytic subunit of the mitochondrial trifunctional protein that performs downstream dehydrogenation and hydration steps for long-chain acyl-CoAs.

“HADHA is the catalytic subunit of the mitochondrial trifunctional protein that performs downstream dehydrogenation and hydration steps for long-chain acyl-CoAs [92].”

• cites [92] Yang, J. , et al., Analysis of a family with mitochondrial trifunctional protein deficiency caused by HADHA gene mutations. Mol Med Rep, 2022. 25(2). sourceSupported

May combine two claims.

Only 13.1% of surviving males and 8.3% of surviving females were Homo KO at weaning, implying roughly half of Homo KO males and three-quarters of Homo KO females died before weaning.

“yet only 13.1% of surviving males and 8.3% of surviving females were Homo KO at weaning, implying that roughly half of Homo KO males and three-quarters of Homo KO females died before weaning (Figure 1A).”

May combine two claims.

PBS treatment had no detectable effect on body weight, blood glucose, spleen weight, or hemicerebrum weight.

“PBS treatment had no detectable effect on body weight, blood glucose, spleen weight, or hemicerebrum weight, so these animals were pooled with the baseline cohort for the expanded analyses (Figure S1 and S3).”

May combine two claims.

All Plcg2 Homo KO mice that survived to weaning lived to the planned three-month endpoint and displayed normal body weight relative to WT and Het KO littermates.

“Despite elevated pre-weaning mortality, all Plcg2 Homo KO mice that survived to weaning lived to the planned three-month endpoint and displayed normal body weight relative to WT and Het KO littermates.”

May combine two claims.

In Plcg2 Homo KO mice, CD8 Treg frequencies are significantly lower in spleen (35% decrease) and cervical lymph nodes (42% decrease) compared with WT.

“Plcg2 Homo KO mice exhibited significantly lower frequencies of CD8 Tregs in spleen (35% decrease) and cervical lymph nodes (42% decrease, Figure 2I–J)”

May combine two claims.

Females weighed less than males at 3 months (23% lower mean body weight), but within each sex there were no significant differences among genotypes.

“Females weighed less than males at 3 months (23% lower mean body weight), but within each sex there were no significant differences among genotypes (Figure 1B and Figure S1A).”

May combine two claims.

Dry cerebrum weight does not differ across Plcg2 genotypes at three months of age in either sex, indicating no gross brain atrophy in this young adult time window.

“we measured dry cerebrum weight and observed no differences across genotypes, indicating no gross brain atrophy in this young adult time window in either sex (Figure 3A and Figure S1D).”

May combine two claims.

When saline-treated controls were included, non-fasted glucose was reduced by 15% in males and 11% in females relative to WT, with statistically significant decreases in males.

“When saline-treated controls from an independent cohort were included, this effect reached statistical significance, with lower glucose in Homo KO mice and Het KO animals exhibiting intermediate values, non-fasted glucose was reduced by 15% in males and 11% in females relative to WT, with statistically significant decreases in males (Figure S1B).”

May combine two claims.

Across more than five years of Plcg2 Het intercrosses, >650 offspring from 130 litters were generated, with an average of 5.4 pups at birth and 4.7 mice at weaning.

“Across more than five years of colony maintenance under specific pathogen-free, Helicobacter-free barrier conditions under sterile housing conditions commonly used for immunocompromised mouse strains, Plcg2 Het intercrosses generated >650 offspring from 130 litters, with an average of 5.4 pups at birth and 4.7 mice at weaning”

May combine two claims.

DIA-MS proteomics revealed that C1QA and C1QB protein abundance was reduced by 20% and 14%, respectively, in Plcg2 Homo KO cerebrum compared with WT, with a similar 17% decrease in C1QC that trended toward but did not reach statistical significance.

“DIA-MS proteomics revealed that C1QA and C1QB protein abundance was reduced by 20% and 14%, respectively, in Plcg2 Homo KO cerebrum compared with WT (Figure 6D–E), with a similar 17% decrease in C1QC that trended toward but did not reach statistical significance after correcting for multiple comparisons (Figure 6F).”

May combine two claims.

Decreased proteins were dominated by microglia-enriched complement components, whereas increased proteins included multiple enzymes involved in fatty-acid oxidation.

“decreased proteins were dominated by microglia-enriched complement components, whereas increased proteins included multiple enzymes involved in fatty-acid oxidation.”

May combine two claims.

Among 27 quantified acylcarnitine species, three showed significant genotype effects after FDR correction: C6-OH, C8:1, and C5-DC; C6-OH and C8:1 were increased by 36% and 70%, respectively, in Homo KO brains relative to WT, and C6-OH was also increased relative to Het KO.

“Among 27 quantified species (C0 and C2–C20), three showed significant genotype effects after FDR correction: 3-hydroxyhexanoylcarnitine (C6-OH), 2-octenoylcarnitine (C8:1), and L-glutarylcarnitine (C5-DC) (Figure 7K–L). C6-OH and C8:1 were increased by 36% and 70%, respectively, in Homo KO brains relative to WT, and C6-OH was also increased relative to Het KO (Figure 7K–L).”

May combine two claims.

Total HexCer was reduced by ~15% in Plcg2 Homo KO cerebrum relative to WT and Het KO mice, primarily driven by losses in the non-hydroxy HexCer subclass by 23%, whereas hydroxy HexCer species showed a downward trend (−8%) that did not reach statistical significance.

“Total HexCer was reduced by ~15% in Plcg2 Homo KO cerebrum relative to WT and Het KO mice (Figure 9A–B), and this effect was primarily driven by losses in the non-hydroxy HexCer subclass by 23% (Figure 9C), whereas hydroxy HexCer species showed a downward trend (−8%) that did not reach statistical significance.”

May combine two claims.

Absolute NanoString quantification showed that Phyh mRNA was increased by 6% and Fth1 transcript was increased by 7% in Plcg2 Homo KO cerebrum compared with WT.

“Absolute NanoString quantification showed that Phyh mRNA was increased by 6% in Plcg2 Homo KO cerebrum compared with WT (Figure 7A). Fth1 transcript was increased by 7% in Plcg2 Homo KO cerebrum (Figure 7B).”

May combine two claims.

Total DAG levels only modestly trended downward in Homo KO brains relative to WT (7% reduction), and none of the saturation-based DAG subclasses were significantly altered.

“Finally, total diacylglycerol (DAG) levels only modestly trended downward in Homo KO brains relative to WT (7% reduction; Figure 8F–G). Trying to get more granularity we broke into saturation-based DAG subclasses (saturated, monounsaturated, polyunsaturated), but none were significantly altered (Figure S4D-F).”

May combine two claims.

Across public mouse and human single-cell and single-nucleus RNA-seq atlases, Plcg2 transcripts are enriched in microglia and brain-associated macrophages, with additional expression in endothelial and perivascular macrophage-like cells and minimal expression in neurons, astrocytes, and mature oligodendrocytes.

“Across datasets, Plcg2 transcripts were enriched in microglia and brain-associated macrophages, with additional expression in endothelial and perivascular macrophage-like cells and minimal expression in neurons, astrocytes, and mature oligodendrocytes (Figure 3E–F).”

May combine two claims.

Volcano-plot analysis identified 17 differentially abundant lipids between Plcg2 Homo KO and WT brains; 16 were decreased and 1 was increased.

“Volcano-plot analysis identified a focused set of 17 differentially abundant lipids between Plcg2 Homo KO and WT brains; strikingly, 16 of these species were decreased and only 1 was increased, yielding a predominantly loss-of-function signature.”

May combine two claims.

Immunofluorescence analysis demonstrated a significant reduction in Iba1+ area coverage by 33% within the cerebrum region of interest in Plcg2 Homo KO mice, while P2RY12+ area fraction remained unchanged across genotypes.

“Complementary immunofluorescence analysis demonstrated a significant reduction in Iba1+ area coverage by 33% within the cerebrum region of interest in Plcg2 Homo KO mice (Figure 6I–L), while P2RY12+ area fraction remained unchanged across genotypes (Figure 6M–P)”

May combine two claims.

NanoString transcriptomic profiling revealed more modest genotype effects: PCA showed a modest trend toward separation of Plcg2 KO samples from WT and Het KO clusters in males with borderline non-significant PERMANOVA, whereas females displayed substantial overlap among Plcg2 genotypes with non-significant PERMANOVA.

“PCA showed a modest trend toward separation of Plcg2 KO samples from WT and Het KO clusters in males, with PERMANOVA results that were borderline non-significant (Figure 4D), whereas females displayed substantial overlap among Plcg2 genotypes with non-significant PERMANOVA results (Figure 4E).”

May combine two claims.

Differential abundance analysis identified 24 proteins altered in Plcg2 Homo KO versus WT brains, with very modest fold-change magnitudes; 11 were decreased and 13 increased.

“differential abundance analysis using a linear model with sex as a covariate identified a small set of 24 proteins altered in Plcg2 Homo KO versus WT brains, with very modest fold-change magnitudes. Of these, 11 were decreased and 13 increased (Figure 4F)”

May combine two claims.

DIA-MS proteomics showed that CPT1A and HADHA protein abundance was increased by approximately 10% in Plcg2 Homo KO cerebrum relative to WT; ACADSB was elevated by 10%, and ALDH9A1 by 14%.

“DIA-MS proteomics showed that CPT1A and HADHA protein abundance was increased by approximately 10% in Plcg2 Homo KO cerebrum relative to WT (Figure 7E–F). ACADSB was elevated by 10%, and ALDH9A1 by 14%, in Plcg2 Homo KO cerebrum (Figure 7G, Figure S3A).”

May combine two claims.

Total levels of PIP1 and PIP3 were unchanged across genotypes, indicating that Plcg2 deficiency does not globally disrupt phosphoinositide abundance.

“Despite this selective depletion of brain PIP2 pools, total levels of phosphatidylinositol-4-phosphate (PIP1) and phosphatidylinositol-3,4,5-trisphosphate (PIP3) were unchanged across genotypes (Figure S4B–C), indicating that Plcg2 deficiency does not globally disrupt phosphoinositide abundance.”

May combine two claims.

Gene Ontology cellular-component analysis identified the mitochondrial matrix as the top enriched term for this protein set; within this group, ETFB abundance was increased by 8% in Plcg2 Homo KO brains, and ACSS1, RIDA, and HMGCS1 showed increases of 13-22%.

“Gene Ontology cellular-component analysis identified the mitochondrial matrix as the top enriched term for this protein set (Figure 7D). Within this matrix-localized group, ETFB abundance was increased by 8% in Plcg2 Homo KO brains (Figure 7H), and additional matrix enzymes including ACSS1, RIDA, and HMGCS1 showed increases of 13–22% (Figure S3B–D).”

May combine two claims.

Six acylcarnitine species (C18:2, C8:1, C14:2, C12:1, C5-DC, and C6-OH) displayed absolute Spearman ρ values greater than 0.5 with Plcg2 genotype; short-, medium-, and long-chain acylcarnitines with strong genotype correlations showed increased levels in Plcg2 Homo KO brains, whereas free carnitine (C0) did not differ significantly across genotypes.

“An exploratory Spearman rank correlation analysis in MetaboAnalyst showed that six acylcarnitine species (C18:2, C8:1, C14:2, C12:1, C5-DC, and C6-OH) displayed absolute Spearman ρ values greater than 0.5 with Plcg2 genotype (Figure S3E). Short-, medium-, and long-chain acylcarnitines with strong genotype correlations showed increased levels in Plcg2 Homo KO brains, whereas free carnitine (C0) did”

May combine two claims.

Most downregulated genes were microglia-enriched, whereas upregulated genes were associated with myelin/oligodendrocyte pathways, fatty-acid oxidation, and vascular functions.

“Most downregulated genes were microglia-enriched, whereas upregulated genes were associated with myelin/oligodendrocyte pathways, consistent with the global lipidomics data, and, unexpectedly, with fatty-acid oxidation and vascular functions.”

May combine two claims.

PCA revealed clear genotype-associated separation of Plcg2 homozygous knockout samples from WT and Het KO brains in both sexes, with significant PERMANOVA results for each sex.

“Principal component analysis (PCA) revealed clear genotype-associated separation of Plcg2 homozygous knockout samples from WT and Het KO brains in both sexes, with significant PERMANOVAs results for each sex (Figure 4A–B).”

May combine two claims.

Ethanolamine plasmalogens emerged as the only other lipid subclass that met significance, and the phosphatidylethanolamine plasmalogen subclass was significantly decreased in Plcg2 Homo KO cerebrum, exemplified by reduced levels of PE P18:0-18:1.

“In addition to non-hydroxy HexCer and the long- and very-long-chain PIP2 subclasses, ethanolamine plasmalogens emerged as the only other lipid subclass that met significance, and this class is likewise highly enriched in myelin membranes. The phosphatidylethanolamine plasmalogen subclass was significantly decreased in Plcg2 Homo KO cerebrum (Figure 9E–F), exemplified by reduced levels of the”

• AssumptionRests on an assumption: Ethanolamine plasmalogens are highly enriched in central myelin.

May combine two claims.

Plcg2 Het KO mice generally showed intermediate expression levels between WT and Homo KO, typically closer to WT, consistent with a partial gene-dosage effect across the complement pathway.

“Plcg2 Het KO mice generally showed intermediate expression levels between WT and Homo KO, typically closer to WT, consistent with a partial gene-dosage effect across the complement pathway.”

May combine two claims.

Surviving young adult Homo KO mice had prominent intestinal vascular abnormalities characterized by a dense meshwork of thin, highly arborized blood-filled vessels that persisted after saline perfusion and appeared more marked in females.

“In surviving young adult Homo KO mice, gross examination revealed prominent intestinal vascular abnormalities characterized by a dense meshwork of thin, highly arborized blood-filled vessels that persisted after saline perfusion and appeared more marked in females.”

Probably not a substantial claim: may not pass S3 (load-bearing). May combine two claims.

qPCR in cerebrum detected a small, non-significant 4% decrease in Ctss in Plcg2 Homo KO mice, with the same direction of effect as NanoString.

“qPCR in cerebrum detected only a small, non-significant 4% decrease in Ctss (Figure 6H), again with the same direction of effect as NanoString”

May combine two claims.

qPCR in cerebrum showed a 29% decrease in C1qa in Plcg2 Homo KO mice relative to WT that did not reach statistical significance but was directionally consistent with the NanoString data.

“C1qa showed a clear 29% decrease in Plcg2 Homo KO mice relative to WT that did not reach statistical significance but was directionally consistent with the NanoString data (Figure 6C).”

May combine two claims.

The two positively correlated modules were enriched for myelin sheath and carboxy/fatty-acid metabolic processes in both sexes, with the male-biased module additionally enriched for angiogenesis and the female-biased module enriched for protein kinase binding and related signaling functions.

“In contrast, the two positively correlated modules were enriched for myelin sheath and carboxy/fatty-acid metabolic processes in both sexes, with the male-biased module additionally enriched for angiogenesis and the female-biased module enriched for protein kinase binding and related signaling functions (Figure 5C–D).”

May combine two claims.

The subset of Plcg2 Homo KO mice that survived to weaning reached three months of age with normal body weight and hemicerebrum mass.

“the subset of Plcg2 Homo KO mice that survived to weaning reached three months of age with normal body weight and hemicerebrum mass”

May combine two claims.

In brain and meningeal immune atlases, Plcg2 is detected in a substantial fraction of CD45+ cells, including parenchymal microglia, multiple border-associated macrophage subsets at choroid plexus and dural surfaces, and ABC-like B-cell clusters in meningeal and brain-associated lymphoid tissues.

“In brain and meningeal immune atlases, Plcg2 was detected in a substantial fraction of CD45+ cells, including parenchymal microglia, multiple border-associated macrophage subsets at choroid plexus and dural surfaces (Figure 3H), and ABC-like B-cell clusters in meningeal and brain-associated lymphoid tissues (Figure 3I).”

May combine two claims.

NanoString pathway scores showed that microglial neurodegenerative phenotype (MgND) pathway scores were markedly reduced in Plcg2 Homo KO brains relative to WT (2.2-fold lower), homeostatic and phagocytosis pathway scores were substantially reduced (~2.5-fold lower than WT), and NF-κB signaling scores were roughly doubled in Homo KO relative to WT.

“Microglial neurodegenerative phenotype (MgND) pathway scores were markedly reduced in Plcg2 Homo KO brains relative to WT (2.2-fold lower; Figure 6Q), suggesting reduced engagement of this neurodegeneration-associated microglial program in line with Ctss/CTSS data. Homeostatic and phagocytosis pathway scores were likewise substantially reduced (~2.5-fold lower than WT), whereas NF-κB signaling s”

May combine two claims. The quote only partly states this claim.

DIA-MS profiling of PLC-family proteins in whole cerebrum revealed robust expression of only seven out of 18 PLC-family members; PLCB1 dominated total PLC abundance and was the only detectable PLCβ isozyme, followed by PLCH2, PLCG1, and PLCD1 as the only detectable members of their families; PLCL1 and PLCL2 were detected, with PLCL2 the second most abundant PLC-family protein; PLCγ2 and 10 дополни

“DIA-MS profiling of PLC-family proteins in whole cerebrum revealed robust expression of only seven out of 18 PLC-family members, comprising 16 mammalian PLC isozymes and two PLC-like proteins (PLCL1/2). PLCB1 dominated total PLC abundance and was the only detectable PLCβ isozyme, followed by PLCH2 as the only detectable η-family isozyme, PLCG1 as the only detectable γ-family isozyme, and PLCD1 as”

May combine two claims.

Plcg2 Het × Het intercrosses yielded far fewer Homo KO weanlings than predicted by Mendelian ratios, with genotype distributions indicating substantial pre- and early postnatal lethality and implying that roughly half of Plcg2-deficient embryos die in utero and many of the remainder succumb between P0 and P5.

“Plcg2 Het × Het intercrosses yielded far fewer Homo KO weanlings than predicted by Mendelian ratios, with genotype distributions indicating substantial pre- and early postnatal lethality and implying that roughly half of Plcg2-deficient embryos die in utero and many of the remainder succumb between P0 and P5.”

May combine two claims.

Acylcarnitine profiling showed that Homo KO brains clustered together irrespective of sex, whereas WT and Het KO samples grouped primarily by sex.

“A metadata heatmap and hierarchical clustering of MetaboAnalyst annotations showed that Homo KO brains clustered together irrespective of sex, whereas WT and Het KO samples grouped primarily by sex (Figure 7I).”

May combine two claims.

The most prominent myelin-linked signal was a coordinated reduction in HexCer species, with roughly half of the differentially abundant lipids belonging to this class.

“the most prominent myelin-linked signal was a coordinated reduction in HexCer species, with roughly half of the differentially abundant lipids belonging to this class.”

May combine two claims.

MAG-positive area tended to be lower in Plcg2 Homo KO mice compared with WT littermates, while NeuN-positive neuronal nuclei and GFAP-positive astrocytes were unchanged across genotypes.

“MAG-positive area tended to be lower in Plcg2 Homo KO mice compared with WT littermates (Figure 9N), aligning with the selective loss of myelin-enriched lipid species. In contrast, NeuN-positive neuronal nuclei (Figure 9O) and GFAP-positive astrocytes were unchanged across genotypes.”

Probably not a substantial claim: may not pass S3 (load-bearing). May combine two claims.

In the Brain Immune Atlas aggregate of CD45+ cells from brain and meningeal regions, Plcg2 transcripts are detected in 18% of immune cells across parenchymal microglia and multiple BAM subsets, with choroid plexus surface and dural BAMs contributing many Plcg2+ cells and a small B-cell cluster displaying the highest per-cell Plcg2 expression in the dataset.

“In the Brain Immune Atlas aggregate of CD45+ cells from brain and meningeal regions, Plcg2 transcripts are detected in 18% of immune cells across parenchymal microglia and multiple border-associated macrophage (BAM) subsets, with choroid plexus surface and dural BAMs contributing many Plcg2+ cells and a small B-cell cluster displaying the highest per-cell Plcg2 expression in the dataset [74].”

• cites [74] sourceNot checked — no full text of the source

May combine two claims.

Brain proteomic profiles showed only weak genotype-associated dispersion with largely overlapping 95% confidence ellipses in PCA space and no clear separation of Plcg2 genotypes by PERMANOVA.

“In both sexes, brain proteomic profiles showed only weak genotype-associated dispersion with largely overlapping 95% confidence ellipses in PCA space with no clear separation of Plcg2 genotypes by PERMANOVA (Figure 4G–H).”

May combine two claims.

Five of the differentially abundant lipids were PIP2 species, including PIP2 16:0-20:1/18:0-18:1, which showed a 17% decrease in Homo KO brains; PIP2 18:0-20:4 tended to decrease by ~13% but did not remain significant after correction.

“Five of the differentially abundant lipids were PIP2 species, including the second most abundant molecular species, PIP2 16:0–20:1/18:0–18:1, which showed a concordant 17% decrease in Homo KO brains (Figure 8E). Similarly, the most abundant species, PIP2 18:0–20:4, tended to decrease by ~13% but did not remain significant after correction for multiple comparisons (Figure S4A).”

May combine two claims.

Differential expression analysis identified 16 differentially expressed genes in Plcg2 Homo KO versus WT brains, with mild fold-change magnitudes, including 5 downregulated and 11 upregulated transcripts.

“differential expression analysis using DESeq2 with sex and brain region included as covariates identified a small set of 16 differentially expressed genes in Plcg2 Homo KO versus WT brains, with mild fold-change magnitudes, including 5 downregulated and 11 upregulated transcripts (Figure 4F).”

May combine two claims.

A sphingomyelin species, SM d18:1-18:1, was significantly decreased in Plcg2 Homo KO brains, mirrored by trending decreases in SM d18:1-24:0 and d18:1-24:1.

“we observed a significant decrease in a sphingomyelin species, SM d18:1-18:1 (Figure 9H–I), mirrored by trending decreases in SM d18:1-24:0 and d18:1-24:1.”

May combine two claims.

NanoString Glial Panel data showed that C1qa and C1qb transcripts were decreased by ~10% in Plcg2 Homo KO mice compared with WT, with C1qc showing a ~10% downward trend (adj. p = 0.097).

“NanoString Glial Panel data showed that C1qa and C1qb transcripts were decreased by ~10% in Plcg2 Homo KO mice compared with WT (Figure 6A–B), with C1qc showing a ~10% downward trend (adj. p = 0.097).”

May combine two claims.

WGCNA identified several modules whose eigengenes correlated with Plcg2 genotype in a sex-dependent manner, including two modules positively associated with Plcg2 Homo KO status (one in males and one in females) and one module negatively associated with genotype in females.

“This analysis identified several modules whose eigengenes correlated with Plcg2 genotype in a sex-dependent manner, including two modules positively associated with Plcg2 Homo KO status (one in males and one in females) and one module negatively associated with genotype in females (Figure 5A).”

May combine two claims.

None of the robustly detected PLC-family members are selectively enriched in microglia based on single-cell and single-nucleus transcriptomic datasets, in contrast to PLCγ2, which is predominantly expressed by microglia in the brain.

“Notably, none of the robustly detected PLC-family members are selectively enriched in microglia based on single-cell and single-nucleus transcriptomic datasets, in contrast to PLCγ2, which is predominantly expressed by microglia in the brain and functions as a key signaling node downstream of TREM2 and other immune receptors.”

May combine two claims.

CD19+CD11b− B cells are decreased, whereas CD19−CD11b+ cells are increased in both percentage and number in Plcg2 Homo KO mice.

“The decrease in CD19+CD11b− B cells is consistent with impaired BCR-dependent survival signaling and reduced B cell maturation described in Plcg2-deficient models, whereas CD19−CD11b+ cells, a population enriched for myeloid/innate lineages (e.g., monocytes/macrophages and granulocytes), are increased in both percentage and number”

May combine two claims.

Non-fasted blood glucose was modestly but reproducibly reduced in Homo KO mice, with intermediate values in Het KO animals.

“non-fasted blood glucose was modestly but reproducibly reduced in Homo KO mice, with intermediate values in Het KO animals”

May combine two claims.

Total PIP2 levels were reduced by ~13% in Plcg2 Homo KO brains compared with WT, with similar significant decreases across long-chain and very-long-chain PIP2 subclasses.

“Total levels of PIP2, the canonical substrate of PLCγ2, were reduced by ~13% in Plcg2 Homo KO brains compared with WT (Figure 8A–B), with similar significant decreases across long-chain and very-long-chain PIP2 suclasses (Figure 8C–D).”

• AssumptionRests on an assumption: PLCγ2 directly hydrolyzes PIP2 to yield DAG and inositol trisphosphate.

May combine two claims.

DIA-MS proteomics revealed that JAM3, PADI2, and ANLN were significantly decreased in Plcg2 Homo KO cerebrum, each showing modest but consistent shifts in abundance that mirror the direction of the myelin lipid changes.

“Among these, JAM3 (junctional adhesion molecule 4), PADI2 (peptidyl arginine deiminase 2), and ANLN (anillin) were significantly decreased, each showing modest but consistent shifts in abundance that mirror the direction of the myelin lipid changes (Figure 9J–L).”

Probably not a substantial claim: may not pass S3 (load-bearing). May combine two claims.

Effect sizes for Phyh and Fth1 were similar in males and females, and absolute expression levels were higher in brainstem than cerebrum.

“Effect sizes for Phyh and Fth1 were similar in males and females, and absolute expression levels were higher in brainstem than cerebrum.”

Probably not a substantial claim: may not pass S3 (load-bearing). May combine two claims.

Across all datasets, Plcg2 transcript counts remain relatively low even in these populations, consistent with PLCγ2 being a low-abundance yet selectively expressed enzyme under physiological, non-inflammatory conditions.

“Across all datasets, Plcg2 transcript counts remain relatively low even in these populations, consistent with PLCγ2 being a low-abundance yet selectively expressed enzyme under physiological, non-inflammatory conditions.”

May combine two claims.

Plcg2-sensitive WGCNA co-expression modules are enriched for microglial/immune and lysosomal pathways, myelin-associated transcripts, fatty-acid metabolism, and vascular signaling.

“Plcg2-sensitive modules are enriched for microglial/immune and lysosomal pathways, myelin-associated transcripts, fatty-acid metabolism, and vascular signaling”

May combine two claims.

There was no accompanying loss of NeuN or increase in GFAP in Plcg2 Homo KO brains.

“without accompanying loss of NeuN or increase in GFAP”

May combine two claims.

Within the NanoString dataset, Phyh and Fth1 are modestly but significantly upregulated in Plcg2 Homo KO cerebrum, with higher absolute levels in brainstem.

“modest but significant upregulation of Phyh and Fth1 in Plcg2 Homo KO cerebrum, with higher absolute levels in brainstem”

Probably not a substantial claim: may not pass S3 (load-bearing), S4 (based). May combine two claims.

An unpublished mouse atlas of CNS-resident B cells reveals enrichment of Plcg2 in CD11c+T-bet+ ABC-like clusters in meningeal and brain-associated lymphoid tissues, with analogous PLCG2-high ABC-like populations in human post-mortem brain B-cell datasets.

“An unpublished mouse atlas of CNS-resident B cells reveals enrichment of Plcg2 in CD11c+T-bet+ ABC-like clusters in meningeal and brain-associated lymphoid tissues, with analogous PLCG2-high ABC-like populations in human post-mortem brain B-cell datasets.”

May combine two claims.

The strongest lipidomic signal of Plcg2 deficiency was a coordinated reduction in myelin-enriched lipid classes: total HexCer was reduced, driven by non-hydroxy HexCer species that correspond predominantly to galactosylceramides, together with significant decreases in ethanolamine plasmalogens.

“the strongest lipidomic signal of Plcg2 deficiency was a coordinated reduction in myelin-enriched lipid classes: total HexCer was reduced, driven by non-hydroxy HexCer species that correspond predominantly to galactosylceramides, together with significant decreases in ethanolamine plasmalogens.”

May combine two claims.

Homo KO brains exhibit a dominant, sex-independent acylcarnitine profile, in contrast to WT and Het KO samples that segregate primarily by sex.

“Homo KO brains exhibit a dominant, sex-independent acylcarnitine profile, in contrast to WT and Het KO samples that segregate primarily by sex”

Probably not a substantial claim: may not pass S3 (load-bearing).

Females exhibited greater mortality in our colony.

“exhibited greater mortality in our colony”

Probably not a substantial claim: may not pass S3 (load-bearing).

Observed phenotypes in Plcg2 Homo KO mice may reflect developmental compensation.

“observed phenotypes may reflect developmental compensation”

• AssumptionRests on an assumption: Constitutive Plcg2 Homo KO mice display intestinal vascular abnormalities.

Probably not a substantial claim: may not pass S3 (load-bearing).

qPCR primers were validated to have an efficiency between 80% and 120%.

“Primers were obtained from Sigma (Supplemental Table 1) and validated to have an efficiency between 80% and 120%.”

May combine two claims.

The PLCG2 Q816X and R953X loss-of-function variants reduce PLCG2 expression by ~50% and confer substantial risk for AD (OR ≈ 10).

“the very rare PLCG2 Q816X and R953X loss-of-function (LoF) variants that reduce PLCG2 expression by ~50% and confer substantial risk for AD (OR ≈ 10 [6], comparable to having two APOE4 alleles)”

• cites [6] Coulon, A. , et al., Non-microglial downregulation of PLCG2 impairs synaptic function and elicits Alzheimer disease-related hallmarks. bioRxiv, 2026.Not matched

  Couldn’t be matched to a paper in Crossref, so it can’t be checked.

Probably not a substantial claim: may not pass S3 (load-bearing).

The investigator who performed RNA extractions, hybridization, and ran the SPRINT cartridge was blinded to the genotypes of the samples.

“The investigator (S.B.) who performed RNA extractions, hybridization, and ran the SPRING cartridge was blinded to the genotypes of the samples.”

Probably not a substantial claim: may not pass S3 (load-bearing).

All samples processed for lipid extraction and MS were included in all analyses (no samples were excluded).

“All samples processed for lipid extraction and MS were included in all analyses (no samples were excluded).”

May combine two claims.

Loss of PLCγ2 subtly erodes central myelin and phosphoinositide homeostasis.

“and subtly erodes central myelin and phosphoinositide homeostasis”

• AssumptionRests on an assumption: The constitutive Plcg2 Homo KO mouse model recapitulates human PLCG2 loss-of-function risk alleles linked to AD.
• AssumptionRests on an assumption: PLCγ2 catalyzes the hydrolysis of PIP2 to DAG and IP3.
• AssumptionRests on an assumption: DAG and IP3 feed into downstream signaling pathways involving PKC, lipid biosynthesis, and intracellular calcium regulation.

Probably not a substantial claim: may not pass S3 (load-bearing).

The investigators who processed the proteomics samples and ran MS data were blinded to the genotypes of the samples.

“The investigators (S.P. and S.W.) who processed the samples and ran MS data were blinded to the genotypes of the samples.”

Probably not a substantial claim: may not pass S3 (load-bearing). May combine two claims.

The investigator who performed lipid extraction, ran mass spectrometry, and quantified all lipid species was blinded to the genotypes of the samples, which were randomized.

“The investigator (H.W.) who performed lipid extraction, ran mass spectrometry (MS), and quantified all lipid species was completely blinded to the genotypes of the samples, which were randomized.”

Probably not a substantial claim: may not pass S3 (load-bearing).

All RNA samples hybridized and loaded into the SPRINT cartridges were included in all analyses (no samples were excluded).

“All RNA samples hybridized and loaded into the SPRINT cartridges were included in all analyses (no samples were excluded).”

The quote only partly states this claim.

The 10% increase in microglial CD11c MFI indicates a modest shift toward a more CD11c-high microglial phenotype at three months of age.

“indicating a modest shift toward a more CD11c-high microglial phenotype at this age.”

May combine two claims.

Plcg2 deficiency exerts its strongest impact on brain lipid metabolism, particularly myelin-associated and PIP2 species, with more modest effects on glial RNA signatures and minimal global-scale alterations in the proteome, while still showing discrete protein-level changes that converge on microglial complement pathways and fatty-acid oxidation.

“Together, these multi-omic data indicate that Plcg2 deficiency exerts its strongest impact on brain lipid metabolism, particularly myelin-associated and PIP2 species, with more modest effects on glial RNA signatures and minimal global-scale alterations in the proteome, while still showing discrete protein-level changes that converge on microglial complement pathways and fatty-acid oxidation.”

May combine two claims.

The concomitant expansion of pro-inflammatory ABC-like CD11c+T-bet+ B cells and depletion of CD4 and CD8 regulatory T-cell subsets removes key tolerance-maintaining lymphocytes while enriching effector populations that drive chronic inflammation, providing a cellular basis for compromised systemic immune tolerance in Plcg2-deficient mice.

“the concomitant expansion of pro-inflammatory ABC-like CD11c+T-bet+ B cells and depletion of CD4 and CD8 regulatory T-cell subsets removes key tolerance-maintaining lymphocytes while enriching effector populations that drive chronic inflammation, providing a cellular basis for compromised systemic immune tolerance in Plcg2-deficient mice.”

May combine two claims.

PLCγ2 deficiency drives a coordinated shift toward pro-inflammatory, ABC-rich B-cell states and diminished regulatory T-cell control in both systemic and brain-draining lymphoid tissues, a combination predicted to compromise immune tolerance and sensitize to autoimmune or neuroinflammatory pathology over time.

“Together, these findings support a model in which PLCγ2 deficiency drives a coordinated shift toward pro-inflammatory, ABC-rich B-cell states and diminished regulatory T-cell control in both systemic and brain-draining lymphoid tissues, a combination that is predicted to compromise immune tolerance and sensitize to autoimmune or neuroinflammatory pathology over time.”

May combine two claims.

Plcg2 deficiency produced a characteristic pattern of systemic immune remodeling, marked by splenomegaly, myeloid-skewed spleen composition, enrichment of age-associated B-cell (ABC-like) subsets, and parallel reductions in CD4 and CD8 regulatory T-cell populations.

“Plcg2 deficiency produced a characteristic pattern of systemic immune remodeling, marked by splenomegaly, myeloid-skewed spleen composition, enrichment of age-associated B-cell (ABC-like) subsets, and parallel reductions in CD4 and CD8 regulatory T-cell populations.”

May combine two claims.

PLCγ2 is essential for normal developmental survival and vascular patterning.

“Our data reinforce that PLCγ2 is essential for normal developmental survival and vascular patterning.”

May combine two claims.

PLCγ2 deficiency rebalances peripheral immunity away from conventional B cells and toward myeloid/innate effectors, reducing the pool of cells that normally support humoral homeostasis.

“Collectively, these changes indicate that PLCγ2 deficiency does not simply remodel spleen size, but rebalances peripheral immunity away from conventional B cells and toward myeloid/innate effectors, reducing the pool of cells that normally support humoral homeostasis.”

May combine two claims.

Microglia are the predominant Plcg2-expressing cell type within the brain parenchyma, while BAMs, ABC-like B cells at CNS borders, and arterial endothelial cells are Plcg2-enriched populations well positioned to mediate PLCG2-modulated neuroimmune and vascular signaling.

“Taken together, these datasets reinforce that microglia are the predominant Plcg2-expressing cell type within the brain parenchyma, while also identifying BAMs, ABC-like B cells at CNS borders, and arterial endothelial cells as Plcg2-enriched populations that are well positioned to mediate PLCG2-modulated neuroimmune and vascular signaling.”

May combine two claims.

This upregulation is consistent with enhanced peroxisomal oxidation of branched-chain fatty acids and increased iron-storage capacity in myelin-rich white matter tracts.

“is consistent with enhanced peroxisomal oxidation of branched-chain fatty acids and increased iron-storage capacity in myelin-rich white matter tracts.”

May combine two claims.

PLCγ2 deficiency produces a mild but coherent erosion of myelin membranes that is actively countered at the RNA level, rather than a nonspecific injury to all brain cell types.

“These converging biochemical, proteomic, histologic, and transcriptional data strongly argue that PLCγ2 deficiency produces a mild but coherent erosion of myelin membranes that is actively countered at the RNA level, rather than a nonspecific injury to all brain cell types.”

May combine two claims.

PLCγ2 deficiency installs a coordinated program in the mouse brain characterized by impaired PIP2 homeostasis, selective loss of myelin-enriched lipid and protein components, and increased reliance on mitochondrial and peroxisomal oxidative pathways.

“these myelin and PIP2 data indicate that PLCγ2 deficiency installs a coordinated program in the mouse brain characterized by impaired PIP2 homeostasis, selective loss of myelin-enriched lipid and protein components, and increased reliance on mitochondrial and peroxisomal oxidative pathways.”

May combine two claims.

PLCγ2 deficiency in young adult mice is associated with mild but systematic alterations in microglial complement, lysosomal, and signaling programs, dampening complement- and lysosome-linked microglial states while shifting signaling balance toward NF-κB-associated responses even in the absence of overt neurodegeneration.

“These coordinated changes support the conclusion that PLCγ2 deficiency in young adult mice is associated with mild but systematic alterations in microglial complement, lysosomal, and signaling programs, dampening complement- and lysosome-linked microglial states while shifting signaling balance toward NF-κB-associated responses even in the absence of overt neurodegeneration.”

May combine two claims.

Loss of PLCγ2 perturbs oligodendrocyte and myelin signaling pathways that normally sustain myelin-associated PIP2, coupling altered PIP2 homeostasis to emerging deficits in central myelin.

“a parsimonious explanation is that loss of PLCγ2 perturbs oligodendrocyte and myelin signaling pathways that normally sustain myelin-associated PIP2, coupling altered PIP2 homeostasis to emerging deficits in central myelin.”

May combine two claims.

Plcg2 loss pushes the immune system toward a pro-inflammatory, ABC-rich and Treg-poor state that is expected to weaken peripheral tolerance and favor chronic low-grade inflammation, particularly in females.

“Plcg2 loss pushes the immune system toward a pro-inflammatory, ABC-rich and Treg-poor state that is expected to weaken peripheral tolerance and favor chronic low-grade inflammation, particularly in females”

• AssumptionRests on an assumption: Females already show higher susceptibility to autoimmune disease.

May combine two claims.

Its absence is associated with coordinated alterations in microglial complement and lysosomal programs, selective myelin-associated lipid and protein loss, impaired PIP2 homeostasis, and increased reliance on mitochondrial and peroxisomal oxidative pathways.

“its absence is associated with coordinated alterations in microglial complement and lysosomal programs, selective myelin-associated lipid and protein loss, impaired PIP2 homeostasis, and increased reliance on mitochondrial and peroxisomal oxidative pathways.”

Probably not a substantial claim: may not pass S3 (load-bearing).

FDR-adjusted p values from linear models adjusted for sex are provided in the graphs.

“FDR-adjusted p values from linear models adjusted for sex are provided in the graphs.”

Probably not a substantial claim: may not pass S3 (load-bearing), S4 (based).

ABC expansion, Treg depletion, and early microglial and myelin-associated changes observed in Plcg2-deficient mice can be viewed as exaggerated manifestations of pathways that are more subtly tuned by protective PLCG2 alleles in humans.

“the ABC expansion, Treg depletion, and early microglial and myelin-associated changes observed in Plcg2-deficient mice can be viewed as exaggerated manifestations of pathways that are more subtly tuned by protective PLCG2 alleles in humans.”

Probably not a substantial claim: may not pass S4 (based).

PLCγ2 sits at a shared signaling hub in microglia, border-associated macrophages, arterial endothelial cells, and ABC-like B cells.

“PLCγ2 sits at a shared signaling hub in microglia, border-associated macrophages, arterial endothelial cells, and ABC-like B cells”