The DOI matches its Crossref record; 104 of the 105 references it cites were found in a registry or an index, and 1 are not checked yet; 10 of the 24 sources its claims cite were checked for support.
Lysosome-related organelles orchestrate guanine crystal formation in pigment cells
Open accessPublished version of a preprint
Abstract
Iridosomes, the guanine crystal-forming organelles of pigment-producing iridophores, are among the most versatile, visually striking yet mechanistically uncharacterized organelles in vertebrate biology. Lysosome-related organelles (LROs) support cell type–specific functions by adapting endolysosomal pathways for specialized roles. Here, we show that iridosomes represent a subtype of LROs. Using transcriptomic profiling of zebrafish iridophores, CRISPR-Cas9-mediated gene disruption, and cryogenic transmission electron microscopy, we define the molecular program underlying iridosome biogenesis. Iridosomes have evolved unique adaptations for crystal growth while retaining core features of other LROs. Key regulators, including Rab32a, Ap3m2, and Hps5, are essential for crystal formation, with gene knockouts causing reduced crystal number, altered morphology, and distinct maturation defects. We further identify hallmark LRO features in iridosomes, including intraluminal vesicles and pH-regulated developmental transitions. Cross-species transcriptomic analysis confirms that iridosomes share an LRO signature across vertebrates, including teleost fish and reptiles, suggesting ancient evolutionary origins. These findings establish iridosomes as crystalline LROs and as a model for investigating how cells construct structurally specialized organelles through coordinated trafficking and crystallization, with implications for LRO evolution and human disease.
Verified 2026-11-10 · 1 reference not checked yet
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Written from the paper’s full text.
TL;DR
The paper shows that zebrafish iridosomes, the guanine crystal-forming organelles of iridophores, are a specialized type of lysosome-related organelle (LRO). It identifies conserved LRO machinery—including Rab32a, Ap3m2, and Hps5—required for iridosome biogenesis and crystal formation, and finds LRO signatures in iridophores across medaka and gecko.
Key findings
- Transcriptomic profiling of FACS-isolated 5 dpf zebrafish iridophores identified 1,222 significantly upregulated genes, including iridophore markers such as pnp4a, tfec, slc2a15a, gmps, gpnmb, and alx4a, with enrichment for pigment granule organization and lysosome-related pathways. Over 30 LRO regulators were upregulated, including rab38, rab32, rab5, AP3/AP2 subunits, BLOC components, HPS proteins, V-ATPase, and VPS-associated proteins; a 27-gene LRO signature was significantly elevated versus control cells (two-tailed unpaired Student’s t test, P < 0.0001).
- CRISPR mutants showed reduced crystal production: rab32a−/− and ap3m2−/− larvae had fewer crystals without detectable effects on overall larval development. rab32a−/− mutants produced shorter, lower-aspect-ratio, more distorted crystals, whereas ap3m2−/− mutants maintained WT-like crystal morphology; ap3m2−/− mutants also had reduced melanin pigmentation, while rab32a−/− mutants did not. hps5−/− mutants had severe crystal deficiency, with almost no crystals in the eyes at 72 hpf and irregular crystal assemblies at 7 dpf, plus reduced melanin pigmentation.
- Cryo-TEM of 81 iridosomes from 12 iridophores detected intraluminal vesicles (ILVs) in 18 cases (22%); ILVs ranged from ~20–40 nm to larger structures (96 ± 95 nm overall, up to several hundred nanometers) and were less common in large, late-stage organelles, supporting an endosomal origin.
- Cross-species scRNAseq analysis found significantly elevated LRO scores in medaka and leopard gecko iridophores compared with general cell populations (medaka: two-tailed unpaired Student’s t test, P < 0.0001; gecko: two-way ANOVA with Tukey, P < 0.0001 for iridophores versus nonpigment cells and melanophores versus nonpigment cells, P < 0.05 for iridophores versus melanophores).
Methods
- Zebrafish larvae were used as the model. Iridophores were isolated by FACS from Tg(pnp4a:PALM-mCherry) larvae at 5 dpf and compared with a low-mCherry control cell population; bulk MARS-Seq RNA-seq libraries were prepared and analyzed with UTAP, DESeq2, Metascape, STRING, and Cytoscape.
- Functional tests used CRISPR-Cas9-generated rab32a−/− and ap3m2−/− mutants, an hps5−/− mutant line, and morpholino knockdowns, combined with live confocal/reflectance imaging, HCR fluorescence in situ hybridization, cryo-TEM, and quantification of crystal area, crystal morphology, and ILVs.
- Cross-species conservation was assessed by reanalyzing publicly available medaka and leopard gecko scRNAseq datasets with a 27-gene LRO score; bulk RNA-seq deconvolution used CIBERSORTx with the Daniocell dataset as reference.
Limitations
- Stated in the paper: rab32a and ap3m2 phenotypes were partial, consistent with known redundancy and compensatory trafficking pathways in LRO biology (e.g., Rab32/38 and AP-3/AP-1); cross-species conservation was inferred from public transcriptomic datasets rather than functional perturbation in medaka or gecko; future studies are needed to dissect the mechanisms further.
- Evident from the text: the study’s functional conclusions rely primarily on zebrafish, and the LRO classification uses a curated 27-gene marker set that may not capture all LRO components; the hps5−/− mutant is an existing line with a severe phenotype, and direct rescue or additional independent validation is not described in the provided text.
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Claims the paper makes
10 of 24 cited sources checked · 3 supported · 0 flagged · accuracy not yet measured
- Interpretationown data
The phenotypes of rab32a and hps5 mutants suggest distinct contributions to crystal morphology and organelle maturation.
“Notably, the phenotypes of rab32a and hps5 mutants suggest distinct contributions also to crystal morphology and organelle maturation, mirroring the specialized trafficking roles previously ascribed to these proteins in melanosomes (30, 41, 85, 90, 91).”
Quote in the paperSubstantial claim5 of 5 sources checked- cites [30] C. M. Daly, J. Willer, R. Gregg, J. M. Gross, Snow white, a zebrafish model of Hermansky-Pudlak Syndrome type 5. Genetics 195, 481– 494 (2013), 10.1534/genetics.113.154898. 23893484 PMC3781975 source
The section “Melanosome maturation is disrupted in snw/hps5 mutants” reports fewer mature melanosomes and suggests that Hps5 may have a role in iridophore formation. It does not examine crystal morphology or compare hps5 mutants with rab32a mutants, so it supports only the Hps5-related organelle-maturation part of the claim. (LLM, conf=0.88)
Experimental — accuracy not yet measured - cites [41] C. Wasmeier, Rab38 and Rab32 control post-Golgi trafficking of melanogenic enzymes. J. Cell Biol. 175, 271– 281 (2006), 10.1083/jcb.200606050. 17043139 PMC2064568 source
The Results and Discussion describe Rab32/Rab38-dependent trafficking of melanogenic enzymes and a loss of mature, but not stage II, melanosomes in deficient cells. The Discussion also notes that different HPS mutants disrupt melanosome maturation at different stages. It does not examine rab32a or hps5 mutants, compare their phenotypes, or address crystal morphology; those specifics are not supported by this source. (LLM, conf=0.87)
Experimental — accuracy not yet measured - cites [85] S. M. Di Pietro, J. M. Falcón-Pérez, E. C. Dell’Angelica, Characterization of BLOC-2, a complex containing the Hermansky-Pudlak syndrome proteins HPS3, HPS5 and HPS6. Traffic 5, 276– 283 (2004), 10.1111/j.1600-0854.2004.0171.x. 15030569 source
The Abstract identifies HPS5 as a BLOC-2 component associated with melanosome defects, and the “BLOC-2 Contains HPS3, HPS5 and HPS6 Proteins” section describes melanosome phenotypes in Hps5-mutant mice. That supports the citation’s background point about HPS5 and melanosomes, but this paper does not address rab32a or compare the mutants’ contributions to crystal morphology or organelle maturation. The comparison is the citing authors’ interpretation, not a finding of this source. (LLM, conf=0.85)
Experimental — accuracy not yet measured - cites [90] M. Fukuda, Rab GTPases: Key players in melanosome biogenesis, transport, and transfer. Pigment Cell Melanoma Res. 34, 222– 235 (2021), 10.1111/pcmr.12931. 32997883 source
Section 2 (p. 225) describes Rab32/38-mediated trafficking of melanogenic enzymes to immature melanosomes, supporting the cited background about Rab32’s melanosome role. The passages do not identify a trafficking role for HPS5 specifically, so they do not fully support the roles attributed to both proteins. The crystal-mutant interpretation is the citing authors’ own inference, not a finding attributed to this source. (LLM, conf=0.83)
Experimental — accuracy not yet measured - cites [91] A. Helip-Wooley, Improper trafficking of melanocyte-specific proteins in Hermansky-Pudlak syndrome type-5. J. Invest. Dermatol. 127, 1471– 1478 (2007). 10.1038/sj.jid.5700737. 17301833 PMC8369813 source
The Discussion (page not available in our copy) links HPS5/BLOC-2 to trafficking of melanogenic proteins and failure of melanosomes to mature. The Ultrastructure section also reports predominantly early-stage melanosomes in HPS-5 cells. The paper does not address rab32a mutants, crystals, or distinct contributions of rab32a and hps5 to crystal morphology. (LLM, conf=0.86)
Experimental — accuracy not yet measured
- Interpretationcitation
The presence of ILVs within iridosomes supports an endosomal origin or an endosomal intermediate during iridosome formation and maturation.
“Because ILVs are a hallmark of multivesicular bodies and are commonly observed during the maturation of multiple LRO types, including melanosomes and cytotoxic granules (86–88), their presence within iridosomes supports an endosomal origin or an endosomal intermediate during iridosome formation and maturation.”
Quote in the paperSubstantial claim3 of 3 sources checked- cites [86] J. Lee, N. M. G. Dieckmann, J. R. Edgar, G. M. Griffiths, R. M. Siegel, Fas ligand localizes to intraluminal vesicles within NK cell cytolytic granules and is enriched at the immune synapse. Immun. Inflamm. Dis. 6, 312– 321 (2018), 10.1002/iid3.219. 29642281 PMC5946154 source
- cites [87] A. C. Theos, A lumenal domain-dependent pathway for sorting to intralumenal vesicles of multivesicular endosomes involved in organelle morphogenesis. Dev. Cell 10, 343– 354 (2006), 10.1016/j.devcel.2006.01.012. 16516837 PMC1773005 source
- cites [88] G. Niel, The tetraspanin CD63 regulates ESCRT-independent and -dependent endosomal sorting during melanogenesis. Dev. Cell 21, 708– 721 (2011), 10.1016/j.devcel.2011.08.019. 21962903 PMC3199340 source
The Introduction (page unavailable) describes ILVs in multivesicular endosomes and identifies ILV-containing stage I premelanosomes as endosomal intermediates, supporting the analogy with melanosomes. Our copy does not address cytotoxic granules or iridosomes; the proposed origin of iridosomes is the citing authors’ inference, not a finding of this source. (LLM, conf=0.85)
Experimental — accuracy not yet measured
- Findingown data
Morpholino knockdown of rab32a and ap3m2 produced a similar phenotype to mutants.
“A similar phenotype was observed in knockdown experiments using morpholinos (SI Appendix, Fig. S4), thereby further validating their roles in iridosome development.”
Quote in the paperNot a substantial claim- Rests on an assumption: Morpholino knockdowns specifically target rab32a and ap3m2 without off-target effects.
- Findingown data
hps5−/− mutants exhibit severely deficient capacity to form guanine crystals, with almost no crystals in eyes of 72 hpf larvae.
“Strikingly, hps5−/− mutants exhibited a severely deficient capacity to form guanine crystals, with almost no crystals present in the eyes of 72 hpf larvae (Fig. 4 B and B′) without any detectable effect on overall larval development (SI Appendix, Fig. S3C).”
- Also stated in: § Iridosomes as a Class of LRO and their Molecular Pathways. · plain
“Strikingly, hps5 mutants had a severely deficient capacity to form guanine crystals, and almost no crystals were observed in the eyes of larvae.”
Quote in the paperSubstantial claim - Also stated in: § Iridosomes as a Class of LRO and their Molecular Pathways. · plain
- Findingown data
When present, ILVs ranged from small vesicles (~20 to 40 nm) to occasional much larger structures (96 ± 95 nm overall; up to several hundred nanometers).
“When present, they ranged from small vesicles (~20 to 40 nm) to occasional much larger structures (96 ± 95 nm overall; up to several hundred nanometers).”
Quote in the paperNot a substantial claim
- Findingown data
Iridophores upregulate over 30 known LRO regulators, including Rab GTPases, AP complexes, BLOC components, HPS proteins, V-ATPase subunits, and VPS-associated proteins.
“Our transcriptomic analysis revealed an enrichment of over 30 known LRO regulators (23) that were upregulated in iridophores (Fig. 2 D and E and SI Appendix, Fig. S2D).”
- Also stated in: § Transcriptomic Profiling of Zebrafish Iridophores Reveals Key LRO Pathways in Iridosome Biogenesis. · plain
“These included members of the Rab GTPase family (such as rab38, rab32, and rab5) (39, 40), AP complexes including ap3 and ap2 subunits (72, 73), and multiple BLOC complexes components (particularly bloc1s1 and bloc1s4) (39, 43).”
- Also stated in: § Transcriptomic Profiling of Zebrafish Iridophores Reveals Key LRO Pathways in Iridosome Biogenesis. · plain
“Additionally, we identified multiple HPS proteins (hps1, hps3, hps4, and hps5) (7, 22, 23, 39), as well as various subunits of vacuolar ATPase (V-ATPase) (74) and VPS-associated proteins (22, 39) (Fig. 2 D and E and SI Appendix, Fig. S2A).”
Quote in the paperSubstantial claim - Also stated in: § Transcriptomic Profiling of Zebrafish Iridophores Reveals Key LRO Pathways in Iridosome Biogenesis. · plain
- Findingown data
The ap3m2−/− mutant line has a 4 nt deletion leading to a truncated protein of 104 aa instead of 418 aa.
“ap3m2−/− resulting in a 4 nt deletion (Fig. 3), leading to a truncated protein, resulting in 104 aa instead of 418 aa.”
Quote in the paperNot a substantial claim - Findingown data
Rab32a mutants resulted in reduced crystal abundance rather than complete loss of iridosomes.
“Rab32a mutants resulted in reduced crystal abundance rather than complete loss of iridosomes.”
Quote in the paperSubstantial claim - Findingown data
Transcriptomic profiling identified 1,222 significantly upregulated genes specific to iridophores.
“We identified 1,222 significantly upregulated genes specific to iridophores (Fig. 2A)”
Quote in the paperSubstantial claim - Findingcitation
ap3m2−/− mutants showed reduced melanin pigmentation compared to WT siblings.
“Notably, ap3m2−/− mutants showed a reduction in melanin pigmentation compared to WT siblings (SI Appendix, Fig. S5) as previously reported (80, 82, 83).”
Quote in the paperNot a substantial claim - Findingown data
The rab32a−/− mutant line has a series of genetic alterations leading to a truncated protein of 122 aa instead of 213 aa.
“rab32a−/− resulting in a series of genetic alternations (Fig. 3), leading to a truncated protein, resulting in 122 aa instead of 213 aa.”
Quote in the paperNot a substantial claim - Findingown data
High magnification of crystals in 7 dpf hps5 mutant larvae revealed irregular-shaped assemblies.
“High magnification of crystals in 7 dpf mutant larvae revealed irregular-shaped assemblies (Fig. 4B″).”
Quote in the paperSubstantial claim - Findingown data
Iridophores selectively upregulate rab20, rab3il1, and rabl6b.
“These include rab20, rab3il1, and rabl6b (SI Appendix, Fig. S2A), which were selectively upregulated in iridophores, and may reflect the functional specialization required for iridosomes.”
Quote in the paperSubstantial claim - Findingown data
ILVs were observed in a subset of iridosomes.
“In addition, we observed ILVs in a subset of iridosomes (SI Appendix, Fig. S6).”
Quote in the paperSubstantial claim - Findingreasoning
rab32a−/− mutants did not show reduction in melanin pigmentation.
“In contrast, such a reduction was not observed in rab32a−/− mutants (SI Appendix, Fig. S5), potentially reflecting functional compensation in melanophores by Rab38, in agreement with previous reports (41, 84).”
Quote in the paperSubstantial claim - Findingown data
Functional enrichment analyses highlighted pigment granule organization and lysosome-related pathways as enriched in iridophores.
“Functional enrichment analyses using Metascape (69) highlighted key pathways enriched in iridophores, particularly the pigment granule organization as well as different lysosome-related pathways (Fig. 2C and SI Appendix, Fig. S2C).”
Quote in the paperSubstantial claim - Findingown data
STRING network of upregulated LRO-associated genes clustered into three clusters: VPS/Rab, BLOC/HPS, and AP complexes.
“Using the k-means algorithm, we clustered the network into three clusters showing a high degree of connectivity between the genes: one centered around VPS and Rab subunits, a second around BLOC and HPS proteins, and a third includes the AP complexes (Fig. 2D).”
Quote in the paperNot a substantial claim - Findingown data
Medaka and gecko iridophores exhibited significantly elevated LRO scores compared to their respective general cell populations.
“Using the same 27-gene LRO signature applied to zebrafish, we found that both medaka and gecko iridophores exhibited significantly elevated LRO scores compared to their respective general cell populations”
Quote in the paperSubstantial claim- Rests on an assumption: The curated 27-gene LRO marker set is a valid and comparable proxy for LRO identity across zebrafish, medaka, and gecko.
- Rests on an assumption: Publicly available medaka and gecko scRNAseq datasets have accurate iridophore annotations.
- Findingown data
ap3m2−/− mutant crystals were similar in morphology to WT.
“while the crystals formed by ap3m2−/− mutants were similar in morphology to those found in WT fish (Fig. 3 A′ and C′)”
Quote in the paperSubstantial claim - Findingown data
rab32a−/− and ap3m2−/− mutations had no detectable effect on overall larval development.
“Both homozygous rab32a−/− and ap3m2−/− mutants showed a marked reduction in the number of crystals formed by iridophores (Fig. 3), without any detectable effect on overall larval development (SI Appendix, Fig. S3 A and B).”
Quote in the paperNot a substantial claim - Findingown data
In a survey of 81 iridosomes from 12 iridophores, ILVs were detected in 18 cases (22%).
“To determine how common ILVs are, we surveyed 81 iridosomes from 12 iridophores by cryo-TEM (iridosomes identified by crystals and/or internal characteristic fibers). ILVs were detected in 18 cases (22%) (SI Appendix, Fig. S6).”
Quote in the paperSubstantial claim - Findingown data
Iridophores show significantly elevated expression of a consensus set of 27 LRO marker genes relative to control samples.
“Iridophores displayed a significantly elevated expression of LRO genes relative to the control samples (Student’s t test, two tailed, unpaired, P < 0.0001) (Fig. 2F and SI Appendix, Fig. S2B), further indicating that the iridosomes within iridophores represent a class of LROs.”
- Also stated in: § Transcriptomic Profiling of Zebrafish Iridophores Reveals Key LRO Pathways in Iridosome Biogenesis. · boosted
“Iridophores showed a robust and statistically significant elevation of this LRO gene set relative to the heterogeneous control population (two-tailed unpaired Student’s t test, P < 0.0001) (Fig. 2F and SI Appendix, Fig. S1B), supporting the classification of iridosomes as LROs.”
Quote in the paperSubstantial claim- Rests on an assumption: The curated 27-gene LRO marker set is a valid and comparable proxy for LRO identity across zebrafish, medaka, and gecko.
- Also stated in: § Transcriptomic Profiling of Zebrafish Iridophores Reveals Key LRO Pathways in Iridosome Biogenesis. · boosted
- Findingown data
ILVs were less common in large, late-stage organelles, appearing only once among 10 iridosomes larger than 1,000 nm.
“ILVs were less common in large, late-stage organelles, appearing only once among 10 iridosomes larger than 1,000 nm, consistent with ILVs being enriched at early stages of iridosome biogenesis.”
Quote in the paperSubstantial claim - Findingown data
hps5−/− mutation had no detectable effect on overall larval development.
“Strikingly, hps5−/− mutants exhibited a severely deficient capacity to form guanine crystals, with almost no crystals present in the eyes of 72 hpf larvae (Fig. 4 B and B′) without any detectable effect on overall larval development (SI Appendix, Fig. S3C).”
Quote in the paperNot a substantial claim - Interpretationown data
The molecular machinery underlying iridosome biogenesis is deeply conserved across vertebrate taxa.
“These results further support the notion that the molecular machinery underlying iridosome biogenesis is deeply conserved across vertebrate taxa (SI Appendix, Fig. S7).”
Quote in the paperSubstantial claim - Interpretationcitation
The defects in rab32a, ap3m2, and hps5 mutants recapitulate phenotypes observed in canonical LRO systems, such as melanosome or dense granule disorders in HPS.
“These defects recapitulate the phenotypes observed in canonical LRO systems, such as melanosome or dense granule disorders in HPS (22).”
Quote in the paperSubstantial claim0 of 1 sources checked- cites [22] S. L. Bowman, J. Bi-Karchin, L. Le, M. S. Marks, The road to lysosome-related organelles: Insights from Hermansky-Pudlak syndrome and other rare diseases. Traffic 20, 404– 435 (2019), 10.1111/tra.12646. 30945407 PMC6541516 source
Checked before — its earlier verdict is held back until a new check runs.
- Interpretationreasoning
Functional compensation within the Rab32/38 and AP3/AP1 network may buffer the loss of Rab32a and Ap3m2 in zebrafish iridophores.
“It is therefore possible that functional compensation within the Rab32/38 and AP3/AP1 network buffers the loss of Rab32a and Ap3m2 in zebrafish iridophores as well.”
Quote in the paperNot a substantial claim - Interpretationreasoning
rab20, rab3il1, and rabl6b may confer additional trafficking or regulatory capabilities tailored to guanine crystal formation.
“These genes are not known to participate in melanosome biogenesis, suggesting that they may confer additional trafficking or regulatory capabilities tailored to the demands of guanine crystal formation.”
Quote in the paperNot a substantial claim- Rests on an assumption: rab20, rab3il1, and rabl6b are not known to participate in melanosome biogenesis.
- Interpretationreasoning
Iridosomes leverage LRO machinery to orchestrate spatially precise crystallization of purine metabolites.
“While most LROs store pigments, small molecules, or secreted factors, iridosomes leverage LRO machinery to orchestrate spatially precise crystallization of purine metabolites.”
Quote in the paperSubstantial claim - Interpretationcitation
Iridosome biogenesis depends on a similar molecular machinery that governs the formation of canonical LROs such as melanosomes, platelet dense granules, and Weibel-Palade bodies.
“By integrating transcriptomic profiling, gene perturbation, cryo-TEM, and comparative evolutionary analyses, we reveal that iridosome biogenesis depends on a similar molecular machinery that governs the formation of canonical LROs such as melanosomes, platelet dense granules, and Weibel-Palade bodies (31, 32) (Fig. 4E).”
Quote in the paperSubstantial claim0 of 2 sources checked- cites [31] E. C. Dell’Angelica, C. Mullins, S. Caplan, J. S. Bonifacino, Lysosome-related organelles. FASEB J. 14, 1265– 1278 (2000), 10.1096/fj.14.10.1265. 10877819 source
- cites [32] C. Delevoye, M. S. Marks, G. Raposo, Lysosome-related organelles as functional adaptations of the endolysosomal system. Curr. Opin. Cell Biol. 59, 147– 158 (2019), 10.1016/j.ceb.2019.05.003. 31234051 PMC6726539 source
Checked before — its earlier verdict is held back until a new check runs.
- Interpretationreasoning
Iridosome biogenesis and maturation are severely impaired in hps5−/− mutants.
“The reduction in crystal formation and crystal shape impairment in the hps5−/−mutant was far more pronounced compared to the other mutants we analyzed, suggesting that iridosome biogenesis and maturation are severely impaired in hps5−/− mutants.”
Quote in the paperSubstantial claim - Interpretationown data
Iridosomes display defining structural features of endosomal origin.
“Beyond their molecular signature, iridosomes display defining structural features of endosomal origin.”
Quote in the paperSubstantial claim - Interpretationcitation
The partial reduction in crystal formation in rab32a and ap3m2 mutants is consistent with known redundancy and compensatory trafficking pathways in LRO biology.
“The phenotypes we observed for rab32a and ap3m2 mutants show partial yet statistically significant reduction in crystal formation, a feature that is consistent with known redundancy and compensatory trafficking pathways in LRO biology (41, 48, 89).”
Quote in the paperNot a substantial claim0 of 3 sources checked- cites [41] C. Wasmeier, Rab38 and Rab32 control post-Golgi trafficking of melanogenic enzymes. J. Cell Biol. 175, 271– 281 (2006), 10.1083/jcb.200606050. 17043139 PMC2064568 source
Checked before — its earlier verdict is held back until a new check runs.
- cites [48] A. Sitaram, Differential recognition of a dileucine-based sorting signal by AP-1 and AP-3 reveals a requirement for both BLOC-1 and AP-3 in delivery of OCA2 to melanosomes. Mol. Biol. Cell 23, 3178– 3192 (2012), 10.1091/mbc.e11-06-0509. 22718909 PMC3418312 source
Checked before — its earlier verdict is held back until a new check runs.
- cites [89] A. C. Theos, Functions of adaptor protein (AP)-3 and AP-1 in tyrosinase sorting from endosomes to melanosomes. Mol. Biol. Cell 16, 5356– 5372 (2005), 10.1091/mbc.e05-07-0626. 16162817 PMC1266432 source
- Interpretationown data
Iridosomes are a specialized type of lysosome-related organelle (LRO).
“Using zebrafish larvae, as a tractable, optically transparent system, we show that iridosomes are a specialized type of lysosome-related organelle (LRO).”
- Also stated in: § Iridosomes as a Class of LRO and their Molecular Pathways. · boosted
“Our findings establish that iridosomes, the guanine crystal-bearing organelles of zebrafish iridophores, are members of the LRO family.”
- Also stated in: § Transcriptomic Profiling of Zebrafish Iridophores Reveals Key LRO Pathways in Iridosome Biogenesis. · hedged
“further indicating that the iridosomes within iridophores represent a class of LROs.”
Quote in the paperSubstantial claim- Rests on an assumption: The curated 27-gene LRO marker set is a valid and comparable proxy for LRO identity across zebrafish, medaka, and gecko.
- Rests on an assumption: FACS-sorted pnp4a:PALM-mCherry-positive cells are pure iridophores.
- Also stated in: § Iridosomes as a Class of LRO and their Molecular Pathways. · boosted
- Interpretationreasoning
Rab32a is required in iridophores to direct trafficking of specific components necessary for proper crystal morphogenesis, such as guanine transporters, scaffold proteins, or pH-regulating channels.
“Similarly, our findings suggest that Rab32a is required in iridophores to direct the trafficking of specific components necessary for proper crystal morphogenesis, such as guanine transporters, scaffold proteins, or pH-regulating channels, thus influencing crystal shape and organization.”
Quote in the paperSubstantial claim - Interpretationreasoning
Together, these results point to a functional division of labor among LRO regulators during iridosome development.
“Together, these results point to a functional division of labor among LRO regulators during iridosome development, in which certain components control organelle identity and cargo input, while others modulate the physical characteristics of the organelle’s contents.”
Quote in the paperSubstantial claim - Interpretationown data
rab20, rab3il1, and rabl6b may represent iridophore-specific adaptations to LRO biology.
“These include rab20, rab3il1, and rabl6b (SI Appendix, Fig. S2A), which were selectively upregulated in iridophores, and may reflect the functional specialization required for iridosomes.”
Quote in the paperNot a substantial claim - Interpretationreasoning
Iridosomes follow a similar developmental trajectory of pH modulation as melanosomes.
“Our previous work demonstrating early iridosome (51) acidification, together with our current transcriptomic evidence for upregulated vacuolar-type H+-ATPases (v-ATPases), suggests that iridosomes follow a similar developmental trajectory.”
Quote in the paperSubstantial claim0 of 1 sources checked- cites [51] Z. Eyal, Controlled pH alteration enables guanine accumulation and drives crystallization within iridosomes. Nat. Chem. Biol. 22, 19– 27 (2025), 10.1038/s41589-025-02020-0. 40897845 PMC12727525 source
Checked before — its earlier verdict is held back until a new check runs.
- Interpretationreasoning
Widespread conservation implies strong selective pressure to maintain crystalline optical organelles for light manipulation, camouflage, or signaling across environments and taxa.
“This widespread conservation implies strong selective pressure to maintain crystalline optical organelles for light manipulation, camouflage, or signaling across environments and taxa.”
Quote in the paperNot a substantial claim
- Probably not a substantial claim. 17
- It may state two separate claims as one. 17
Probably not a substantial claim. It may state two separate claims as one.
PremisecitationPNP expression is a marker for iridophores, and OCA2 expression is a marker for melanophores.
“Focusing on pigment cells, we used PNP expression as a marker for iridophores, OCA2 as a marker for melanophores.”
Quote in the paperSubstantial claim1 of 1 sources checked- cites [56] A. Ullate-Agote, A. C. Tzika, The dynamic behavior of chromatophores marks the transition from bands to spots in leopard geckos. Proc. Natl. Acad. Sci. U.S.A. 121, e2400486121 (2024), 10.1073/pnas.2400486121. 38976731 PMC11260152 source
Probably not a substantial claim. The paper’s conclusions may not depend on it. It may state two separate claims as one.
PremisecitationIn zebrafish, teleost-specific gene duplication has expanded the Rab family with additional Rab38 paralogs (Rab38b, Rab38c) and Rab32 paralogs (Rab32a, Rab32b), which are upregulated in iridophores.
“In zebrafish, teleost-specific gene duplication has further expanded this family with additional Rab38 paralogs (84), including Rab38b, and Rab38c, which are upregulated in iridophores, as well as Rab32 paralogs (Rab32a and Rab32b).”
Quote in the paperNot a substantial claim1 of 1 sources checked- cites [84] U. Coppola, G. Annona, S. D’Aniello, F. Ristoratore, Rab32 and Rab38 genes in chordate pigmentation: An evolutionary perspective. BMC Evol. Biol. 16, 26 (2016), 10.1186/s12862-016-0596-1. 26818140 PMC4728774 source
The Results (Evolutionary history) identify three zebrafish Rab38 genes and two Rab32 genes, and the Discussion (Rab32 and Rab38 toolkit) attributes their expansion to both teleost-specific genome duplication and a single-gene duplication. The iridophore claim is not supported: the Results (gene expression patterns) place Rab38b expression in the pharyngeal arches and swim bladder and Rab38c expression in the head, while the Discussion calls Rab38a the sole Rab38 expressed in zebrafish pigment-producing cells. (LLM, conf=0.90)
Experimental — accuracy not yet measured
It may state two separate claims as one.
Findingown dataEarly-stage iridosomes often contained multiple thin, developing crystals, whereas more mature iridosomes typically housed a single larger crystal.
“Early-stage iridosomes often contained multiple thin, developing crystals, whereas more mature iridosomes typically housed a single larger crystal (SI Appendix, Fig. S6), consistent with previous observations (27).”
Quote in the paperNot a substantial claimProbably not a substantial claim. The paper’s conclusions may not depend on it.
Findingown dataThe most efficient crRNA tested was located on exon 2 of the rab32a and exon 2 of the ap3m2 canonical transcripts.
“The most efficient crRNA tested was located on exon 2 of the rab32a and exon 2 of the ap3m2 canonical transcripts”
Quote in the paperNot a substantial claimIt may state two separate claims as one.
Findingown datarab32a−/− mutants produced significantly shorter, lower aspect ratio, and more distorted crystals than WT.
“rab32a−/− mutants produced significantly shorter, with lower aspect ratio and more distorted crystals (Fig. 3B′ and SI Appendix, Fig. S4I).”
Quote in the paperSubstantial claimIt may state two separate claims as one.
Findingown dataBoth rab32a−/− and ap3m2−/− mutants show marked reduction in the number of crystals formed by iridophores.
“Both homozygous rab32a−/− and ap3m2−/− mutants showed a marked reduction in the number of crystals formed by iridophores (Fig. 3), without any detectable effect on overall larval development (SI Appendix, Fig. S3 A and B).”
Quote in the paperSubstantial claimProbably not a substantial claim. The paper’s conclusions may not depend on it.
Findingown dataThe hps5−/− point mutation results in a nonsense mutation leading to a truncated protein of 768 aa instead of 1,133 aa.
“The point mutation results in nonsense mutation leading to a truncated protein, resulting in 768 aa instead of 1,133 aa (Fig. 4).”
Quote in the paperNot a substantial claimIt may state two separate claims as one.
Findingown dataReduction in crystal formation and crystal shape impairment in hps5−/− mutant was far more pronounced compared to other mutants analyzed.
“The reduction in crystal formation and crystal shape impairment in the hps5−/−mutant was far more pronounced compared to the other mutants we analyzed, suggesting that iridosome biogenesis and maturation are severely impaired in hps5−/− mutants.”
Quote in the paperSubstantial claimProbably not a substantial claim. The paper’s conclusions may not depend on it.
Findingcitationhps5 mutants exhibited pronounced reduction in melanin pigmentation.
“In parallel, and consistent with previous reports, hps5 mutants also exhibited a pronounced reduction in melanin pigmentation (30) (SI Appendix, Fig. S5).”
Quote in the paperNot a substantial claimIt may state two separate claims as one.
InterpretationreasoningIridosomes have ancient evolutionary roots, with their formation relying on a conserved regulatory network.
“This suggests that iridosomes have ancient evolutionary roots, with their formation relying on a conserved regulatory network.”
Quote in the paperNot a substantial claimIt may state two separate claims as one.
Interpretationown dataRab32a plays a significant role in proper crystal shaping and structural integrity, whereas Ap3m2 is more generally involved in organelle biogenesis.
“Rab32a appears to play a significant role in proper crystal shaping and structural integrity, whereas Ap3m2 is more generally involved in organelle biogenesis.”
Quote in the paperSubstantial claimProbably not a substantial claim. It may be too vague to check against evidence.
InterpretationreasoningLROs are not defined by their contents, but rather by their shared reliance on a specialized endolysosomal trafficking and maturation system tailored to cell-type-specific roles.
“This finding reinforces the idea that LROs are not defined by their contents, but rather by their shared reliance on a specialized endolysosomal trafficking and maturation system tailored to cell-type-specific roles.”
Quote in the paperNot a substantial claimProbably not a substantial claim. The paper’s conclusions may not depend on it.
Study design and conductcitationThe annotation was further validated by querying the PanglaoDB database with the marker genes of each cluster, using enrichR.
“The annotation was further validated by querying the PanglaoDB database with the marker genes of each cluster, using the R package, enrichR (100).”
Quote in the paperNot a substantial claim0 of 1 sources checked- cites [100] M. V. Kuleshov, Enrichr: A comprehensive gene set enrichment analysis web server 2016 update. Nucleic Acids Res. 44, W90– W97 (2016), 10.1093/nar/gkw377. 27141961 PMC4987924 source
Probably not a substantial claim. The paper’s conclusions may not depend on it.
Study design and conductnone givenLow-quality cells were filtered out based on criteria: fewer than 1,000 detected genes, fewer than 2,000 UMIs, more than 9,000 detected genes, or more than 70,000 UMIs.
“Low-quality cells were filtered out based on the following criteria: fewer than 1,000 detected genes, fewer than 2,000 UMIs, more than 9,000 detected genes, or more than 70,000 UMIs.”
Quote in the paperNot a substantial claimProbably not a substantial claim. The paper’s conclusions may not depend on it. It may state two separate claims as one.
Study design and conductnone givenDoublet detection was performed using scDblFinder, and cells identified as doublets were excluded from further analysis.
“Doublet detection was performed using scDblFinder (v1.18.0), and cells identified as doublets were excluded from further analysis.”
Quote in the paperNot a substantial claimIt may state two separate claims as one.
Interpretationnone givenThis study classifies iridosomes as LROs and reveals a conserved molecular framework for their biogenesis.
“In summary, this study classifies iridosomes as LROs and reveals a conserved molecular framework for their biogenesis.”
Quote in the paperSubstantial claimProbably not a substantial claim. The paper’s conclusions may not depend on it.
Study design and conductnone givenScaling was applied while regressing out cell cycle effects, using human cell cycle gene sets provided by Seurat.
“Scaling was applied while regressing out cell cycle effects, using human cell cycle gene sets provided by Seurat.”
Quote in the paperNot a substantial claimProbably not a substantial claim. The paper’s conclusions may not depend on it. It may state two separate claims as one.
InterpretationreasoningILVs observed in iridosomes may provide organizing centers for similar fibers or may serve for nucleation centers for guanine crystallization by themselves.
“By analogy, the ILVs observed in iridosomes may provide organizing centers for similar fibers or may serve for nucleation centers for guanine crystallization by themselves.”
Quote in the paperNot a substantial claimProbably not a substantial claim. The paper’s conclusions may not depend on it.
PremisecitationIn D. rerio, the housekeeping gene actinb1 has relatively high and uniform expression.
“For D. rerio, the housekeeping gene actinb1 was selected for its relatively high and uniform expression (64) and was specifically calibrated for the MARS-Seq protocol.”
Quote in the paperNot a substantial claim0 of 1 sources checked- cites [64] C. W. Higdon, R. D. Mitra, S. L. Johnson, Gene expression analysis of zebrafish melanocytes, iridophores, and retinal pigmented epithelium reveals indicators of biological function and developmental origin. PLoS ONE 8, e67801 (2013), 10.1371/journal.pone.0067801. 23874447 PMC3706446 source
It may state two separate claims as one.
Interpretationown dataDisrupting key LRO regulators Rab32a, Ap3m2, and Hps5 impairs crystal formation and/or organelle maturation.
“Second, our functional studies demonstrate that disrupting key LRO regulators- Rab32a, Ap3m2, and Hps5, impairs crystal formation and/or organelle maturation.”
Quote in the paperSubstantial claimIt may state two separate claims as one.
InterpretationreasoningThe mechanistic architecture of iridosome development closely parallels melanosome biogenesis and supports classification of iridosomes as a specialized subtype of LROs.
“This mechanistic architecture closely parallels with what has been described in melanosome biogenesis and further supports the classification of iridosomes as a specialized subtype of LROs.”
Quote in the paperSubstantial claimProbably not a substantial claim. The paper’s conclusions may not depend on it. It may state two separate claims as one.
Study design and conductreasoningCells with over 10% mitochondrial gene expression and over 30% ribosomal gene expression were removed to eliminate stressed or dying cells.
“To eliminate stressed or dying cells, we also removed cells with over 10% mitochondrial gene expression and over 30% ribosomal gene expression”
Quote in the paperNot a substantial claimProbably not a substantial claim. The paper’s conclusions may not depend on it. It may state two separate claims as one.
PremisecitationHps5 functions in the BLOC2 complex, which in melanophores is involved in transport from early endosomes to maturating melanosomes.
“Hps5 functions in the BLOC2 complex, which in melanophores is involved in transport from early endosomes to maturating melanosomes (23, 43, 44, 85, 91).”
Quote in the paperNot a substantial claim0 of 5 sources checked- cites [23] L. Le, J. Sirés-Campos, G. Raposo, C. Delevoye, M. S. Marks, Melanosome biogenesis in the pigmentation of mammalian skin. Integr. Comp. Biol. 61, 1517– 1545 (2021), 10.1093/icb/icab078. 34021746 PMC8516112
- cites [43] E. C. Dell’Angelica, The building BLOC(k)s of lysosomes and related organelles. Curr. Opin. Cell Biol. 16, 458– 464 (2004), 10.1016/j.ceb.2004.05.001. 15261680 source
- cites [44] J. J. Bultema, A. L. Ambrosio, C. L. Burek, S. M. Di Pietro, BLOC-2, AP-3, and AP-1 proteins function in concert with Rab38 and Rab32 proteins to mediate protein trafficking to lysosome-related organelles. J. Biol. Chem. 287, 19550– 19563 (2012), 10.1074/jbc.M112.351908. 22511774 PMC3365991 source
Checked before — its earlier verdict is held back until a new check runs.
- cites [85] S. M. Di Pietro, J. M. Falcón-Pérez, E. C. Dell’Angelica, Characterization of BLOC-2, a complex containing the Hermansky-Pudlak syndrome proteins HPS3, HPS5 and HPS6. Traffic 5, 276– 283 (2004), 10.1111/j.1600-0854.2004.0171.x. 15030569 source
Checked before — its earlier verdict is held back until a new check runs.
- cites [91] A. Helip-Wooley, Improper trafficking of melanocyte-specific proteins in Hermansky-Pudlak syndrome type-5. J. Invest. Dermatol. 127, 1471– 1478 (2007). 10.1038/sj.jid.5700737. 17301833 PMC8369813 source
Checked before — its earlier verdict is held back until a new check runs.
It may state two separate claims as one.
Interpretationown dataBoth Rab32a and Ap3m2 are important for iridosome biogenesis and crystal production.
“These findings indicate that both Rab32a and Ap3m2 are important for iridosome biogenesis and crystal production.”
Quote in the paperSubstantial claimProbably not a substantial claim. The paper’s conclusions may not depend on it.
Study design and conductown data63.3% of the cells passed the quality filters.
“(63.3% of the cells passed these filters).”
Quote in the paperNot a substantial claimProbably not a substantial claim. The paper’s conclusions may not depend on it. It may state two separate claims as one.
Study design and conductreasoningCell types represented by fewer than 100 cells, as well as cell types with an excessive number of features (Z-score > 1.96), were excluded to prevent disproportionate influence on downstream deconvolution.
“Cell types represented by fewer than 100 cells, as well as cell types with an excessive number of features (Z-score > 1.96), were excluded to prevent disproportionate influence on downstream deconvolution.”
Quote in the paperNot a substantial claimProbably not a substantial claim. The paper’s conclusions may not depend on it.
Interpretationown dataThe presence of unusually large ILVs compared to other LRO systems may reflect structural specialization in iridosomes.
“The presence of unusually large ILVs compared to other LRO systems may reflect structural specialization in iridosomes.”
Quote in the paperNot a substantial claim
The paper relies on this without support.
The curated 27-gene LRO marker set is a valid and comparable proxy for LRO identity across zebrafish, medaka, and gecko.
“The marker set was assembled using three criteria: i) genes repeatedly annotated as canonical LRO components across multiple model systems, ii) genes with demonstrated roles in melanosome/LRO biogenesis, and iii) genes with conserved, expressed zebrafish orthologs.”
The paper relies on this without support.
FACS-sorted pnp4a:PALM-mCherry-positive cells are pure iridophores.
“Cells were isolated from Tg(pnp4a:PALM-mCherry) positive fish larvae and sorted via FACS.”
The paper relies on this without support.
The CRISPR-generated rab32a−/− and ap3m2−/− alleles are complete loss-of-function.
“Both mutations resulted in premature stop codons predicted to produce nonfunctional proteins (Fig. 3 and Materials and Methods).”
The paper relies on this without support.
The hps5−/− allele is loss-of-function.
“Schematic of the hps5 mutation, which introduces a premature stop codon resulting in a truncated protein.”
The paper relies on this without support.
Publicly available medaka and gecko scRNAseq datasets have accurate iridophore annotations.
“we analyzed publicly available single cell RNAseq datasets from other vertebrate species. Specifically, we calculated an “LRO score” for every iridophore cell from two additional organisms: the medaka (O. latipes) (17), a teleost related to zebrafish, and the leopard gecko (E. macularius) (56), a distantly related reptile”
The paper relies on this without support.
Morpholino knockdowns specifically target rab32a and ap3m2 without off-target effects.
“A similar phenotype was observed in knockdown experiments using morpholinos (SI Appendix, Fig. S4), thereby further validating their roles in iridosome development.”
The paper relies on this without support.
rab20, rab3il1, and rabl6b are not known to participate in melanosome biogenesis.
“These genes are not known to participate in melanosome biogenesis, suggesting that they may confer additional trafficking or regulatory capabilities tailored to the demands of guanine crystal formation.”
The paper relies on this without support.
The genes listed in SI Appendix, Table S1 have a well-established function in LROs.
“These are genes with a well-established function in LROs.”
Self-check
Percentages, sums and reported differences re-computed from the paper’s own numbers.
Each contradiction between two passages listed here was confirmed by an independent check.
Hps5 is assigned to the wrong network node
MinorThe paper places BLOC and HPS proteins in the second network cluster and AP complexes in the third, but later describes Hps5, a BLOC-2 component, as belonging to the third node.
“we investigated Hps5, a component of the BLOC-2 complex identified in the third node of our network analysis (Fig. 4 A–D).”
“one centered around VPS and Rab subunits, a second around BLOC and HPS proteins, and a third includes the AP complexes (Fig. 2D).”
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“For instance, melanosomes in pigment cells synthesize and store melanin for photoprotection (23, 24, 34, 35), platelet dense granules release pro - adhesive factors to support homeostasis (36), and Weibel - Palade bodies in endothelial cells store and secrete proteins vital for vascular health (37).”
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The Dual Functional Reflecting Iris of the Zebrafish
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Self-citationRole of adaptin protein complexes in intracellular trafficking and their impact on diseases
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The Non‐Classical Crystallization Mechanism of a Composite Biogenic Guanine Crystal
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Improper trafficking of melanocyte-specific proteins in Hermansky-Pudlak syndrome type-5
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Morphological and Physiological Colour Changes in the Animal Kingdom
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The physical and cellular mechanism of structural color change in zebrafish
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Self-citationGenetic control over biogenic crystal morphogenesis in zebrafish
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Specialized molecular pathways drive the formation of light-scattering assemblies in leucophores
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pH variations enable guanine crystal formation within iridosomes
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Self-citationInsights into lysosome-related organelle biogenesis: melanosome as a model organelle
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Flagged first, then by citations
Research works printed but not linked: 1
- N. Oshima, A. Kasai, Iridophores involved in generation of skin color in the zebrafish. Brachydanio rerio. Forma Tokyo 17, 91–101 (2002).
Cited by
Sorted by citations
Moirai: single-cell trajectory inference grounded in gene-level expression dynamicsPreprint
Fijn, A. H. B., & Jeuken, G. S. (2026) · bioRxiv (Cold Spring Harbor Laboratory) · doi:10.64898/2026.08.05.742709
Metadata
- Authors
- Gorelick-Ashkenazi, A., Barzilay, Y., Lerer-Goldshtein, T., Olender, T., Eyal, Z., Glaser, M., Broder, Y., Mishol, N., Deis, R., Kedmi, M., & Gur, D.
- Affiliations
- Weizmann Institute of Science (IL)
- Department of Molecular Genetics, Weizmann Institute of Science
- Corresponding author
- Gur, Dvir
- ORCID
- Venue
- Proceedings of the National Academy of Sciences
- Publisher
- National Academy of Sciences
- Published
- 2026-04-08
- Volume
- 123
- Issue
- 15
- Pages
- e2524305123-e2524305123
- ISSN
- 0027-8424 (ISSN-L)
- 1091-6490
- PMC
- PMC13079938
- OpenAlex
- W7151989125
- Cited by
- 1
- References
- 104
- Citations by year
- 2026: 1
- FWCI
- 1.89
- Type
- journal article
- Language
- en
- Open access
- hybrid
- doi.org
- Licence
- Locations
- Proceedings of the National Academy of Sciences (publishedVersion, cc-by-nc-nd)
- bioRxiv (Cold Spring Harbor Laboratory) (submittedVersion, cc-by-nc-nd)
- PubMed Central (publishedVersion, cc-by-nc-nd)
- PubMed (publishedVersion)
- Funders
- EC | Horizon Europe | Excellent Science | HORIZON EUROPE European Research Council (101077470)
- Topics
- Life Sciences › Biochemistry, Genetics and Molecular Biology › Cell Biology › Cellular transport and secretion
- Life Sciences › Biochemistry, Genetics and Molecular Biology › Physiology › Calcium signaling and nucleotide metabolism
- Life Sciences › Biochemistry, Genetics and Molecular Biology › Cell Biology › melanin and skin pigmentation
- Keywords
- lysosome-related organelles, iridophores, endolysosomal trafficking, intraluminal vesicles, organelle evolution, zebrafish, teleosts, reptiles
- MeSH terms
- Animals, Crystallization, Lysosomes, Zebrafish, Organelles, Zebrafish Proteins
About these checks
Registry, retraction, Cites and statistics results are computed, not judged, with one exception: a printed reference that no index lists is read once by a model before it counts as a citation error. Claims are extracted by a model and kept only when their quote appears verbatim in the text; each cited source is then checked, with a model’s help, for whether it says what the claim relies on. Those verdicts can be wrong — read the claim’s quote and the cited source before relying on one.
A language model drew the claims from the paper on 2026-11-10, under version 3 of the claim definition (model deepseek-v4.1-flash, prompt extract-v3).
A second model labelled each claim on 2026-11-10 (model jev-1.13-20260917, definition revision gold-guideline-v0.2).
Cited sources are checked with a language model’s help (gpt-6-sol).
Statistics and arithmetic are recomputed, not judged.
Confidence bands are shown only for fields calibrated on our annotated test set. None is calibrated yet, so no band is shown.
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