Cited by 91Autoimmune and Inflammatory Disorders ResearchImmunodeficiency and Autoimmune DisordersInflammasome and immune disorders

The genetics of macrophage activation syndrome

Schulert, Grant S., Cron, Randy Q.·2020·Genes & Immunity

Abstract

Macrophage activation syndrome (MAS), or secondary hemophagocytic lymphohistiocytosis (HLH), is a cytokine storm syndrome associated with multi-organ system dysfunction and high mortality rates. Laboratory and clinical features resemble primary HLH, which arises in infancy (1 in 50,000 live births) from homozygous mutations in various genes critical to the perforin-mediated cytolytic pathway employed by NK cells and cytotoxic CD8 T lymphocytes. MAS/secondary HLH is about ten times more common and typically presents beyond infancy extending into adulthood. The genetics of MAS are far less defined than for familial HLH. However, the distinction between familial HLH and MAS/secondary HLH is blurred by the finding of heterozygous perforin-pathway mutations in MAS patients, which may function as hypomorphic or partial dominant-negative alleles and contribute to disease pathogenesis. In addition, mutations in a variety of other pathogenic pathways have been noted in patients with MAS/secondary HLH. Many of these genetically disrupted pathways result in a similar cytokine storm syndrome, and can be broadly categorized as impaired viral control (e.g., SH2P1A), dysregulated inflammasome activity (e.g., NLRC4), other immune defects (e.g., IKBKG), and dysregulated metabolism (e.g., LIPA). Collectively these genetic lesions likely combine with states of chronic inflammation, as seen in various rheumatic diseases (e.g., still disease), with or without identified infections, to result in MAS pathology as explained by the threshold model of disease. This emerging paradigm may ultimately support genetic risk stratification for high-risk chronic and even acute inflammatory disorders. Moving forward, continued whole-exome and -genome sequencing will likely identify novel MAS gene associations, as well as noncoding mutations altering levels of gene expression.

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Crossref · 10.1038/s41435-020-0098-4

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  • Data from mouse models of HLH and patients with cytokine storm indicate that the inability of CTLs to kill efficiently leads to prolonged activation of T cells, triggering a cascade of inflammatory tissue damage.

    “Data from mouse models of HLH and patients with cytokine storm indicate that the inability of CTLs to kill efficiently leads to prolonged activation of T cells, triggering a cascade of inflammatory tissue damage.”

    From Cytokine storm (2020) · cites this paper as [23]

  • In patients with primary HLH, various autosomal recessive monogenic abnormalities in granule-mediated cytotoxicity lead to cytokine storm.

    “In patients with primary HLH, various autosomal recessive monogenic abnormalities in granule-mediated cytotoxicity lead to cytokine storm.”

    From Cytokine storm (2020) · cites this paper as [23]

  • Common pathologic mutations in primary HLH include those in PRF1, UNC13D, STXBP1, RAB27A, STX11, SH2D1A, XIAP, and NLRC4.

    “Common pathologic mutations include those occurring in PRF1, UNC13D, STXBP1, RAB27A, STX11, SH2D1A, XIAP, and NLRC4.23”

    From Cytokine storm (2020) · cites this paper as [23]

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Authors
Schulert, G. S., & Cron, R. Q.
Affiliations
  • Cincinnati Children's Hospital Medical Center (US)
  • Children's of Alabama (US)
Corresponding author
Cron, Randy Q.
Venue
Genes & Immunity
Published
2020-04-15
Volume
21
Issue
3
Pages
169-181
ISSN
  • 1466-4879 (ISSN-L)
  • 1476-5470
OpenAlex
W3015523006
Cited by
91
References
124
Citations by year
2026: 11 · 2025: 6 · 2024: 16 · 2023: 16 · 2022: 15 · 2021: 17 · 2020: 10
FWCI
2.27
Type
journal article
Language
en
Open access
closed
Locations
  • Genes and Immunity (publishedVersion)
  • PubMed (publishedVersion)
Funders
  • Histiocytosis Association (pilot grant)
  • Cincinnati Children's Research Foundation (N/A)
Topics
  • Health Sciences › Medicine › Hematology › Autoimmune and Inflammatory Disorders Research
  • Life Sciences › Immunology and Microbiology › Immunology › Immunodeficiency and Autoimmune Disorders
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Inflammasome and immune disorders
Keywords
macrophage activation syndrome, secondary hemophagocytic lymphohistiocytosis, familial hemophagocytic lymphohistiocytosis, natural killer cells, heterozygous mutation, hypomorphic allele, chronic inflammation, rheumatic diseases, virus control, NLRC4, inflammasome, NEMO, LIPA, cytokine storm, genetic risk stratification
MeSH terms
Heterozygote, Humans, Killer Cells, Natural, Mutation, Virus Diseases, CD8-Positive T-Lymphocytes, Genetic Predisposition to Disease, Lymphohistiocytosis, Hemophagocytic, Perforin, Macrophage Activation Syndrome, Inflammasomes

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