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The complement system is a group of approximately 20 plasma proteins that strengthen the body's defenses against infections through opsonization, inflammation, and cell lysis. Opsonization involves coating pathogens with complement proteins, making them more recognizable and facilitating phagocyte engulfment. Certain complement proteins induce inflammation that attracts immune cells to the site of infection. Cell lysis involves the destruction of pathogens through the formation of a...
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Sequencing of the human genome has opened up several best-kept secrets of the genome. Scientists have identified thousands of genome variations that exist within a population. These variations can be a single nucleotide or a larger chromosomal variation.
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Javier Martínez-López1,2, Carlos Rangel-Peláez1, Inmaculada Rodriguez-Martin1

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Lower complement component 4 (C4) gene copy number (CN) increases systemic sclerosis (SSc) risk, particularly C4A in diffuse cutaneous SSc. Distinct C4A and C4B roles are identified in SSc subtypes.

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Area of Science:

  • Immunogenetics
  • Rheumatology
  • Human Genetics

Background:

  • Complement component 4 (C4), encoded by C4A and C4B in the MHC, is crucial for immune regulation and immune complex clearance.
  • Variable C4 gene copy number (CN) and HERV-K elements influence C4 function and are linked to systemic sclerosis (SSc) risk.

Purpose of the Study:

  • To investigate the association between C4 gene CN and SSc clinical and serological subtypes.
  • To identify C4-independent HLA alleles associated with SSc subtypes.

Main Methods:

  • Imputed C4 CNs were compared across various SSc subgroups (ACA+, ATA+, ARA+, TN, lcSSc, dcSSc) and controls.
  • Associations with SSc subtypes were evaluated, alongside identification of C4-independent HLA alleles.

Main Results:

  • Lower C4 CN and higher HERV-K CN correlated with increased SSc risk across all subgroups.
  • ATA+ patients exhibited the strongest association, particularly with C4A CN; differences were more pronounced between autoantibody than clinical subgroups.
  • Sex-biased associations were observed, with males showing stronger effects for C4A and females for C4B in specific SSc subtypes.

Conclusions:

  • Distinct genetic roles of C4A and C4B in SSc susceptibility are highlighted.
  • Lower C4 CNs, especially C4A, may increase the risk of severe dcSSc, potentially via impaired immune complex clearance.