Is C8A p.Arg196Cys (c.586C>T) pathogenic?

C8A p.Arg196Cys (c.586C>T) is classified Uncertain significance in C8A (ClinVar, Single submitter, 1 submitter; last evaluated 2022-01-27). AlphaMissense: likely benign (0.222); Very rare (popmax 0.00178%, nfe).

How common is C8A p.Arg196Cys (c.586C>T) in the general population?

C8A p.Arg196Cys (c.586C>T) is very rare (popmax 0.00178%, nfe) (gnomAD).

What do computational predictors say about C8A p.Arg196Cys (c.586C>T)?

AlphaMissense predicts likely benign (score 0.222) — an in-silico prediction, not a clinical call.

C8A p.Arg196Cys

c.586C>T · rs142286739 · VCV2274094

Uncertain significance Single submitter

Classification

Uncertain significance

ClinVar

Review

Single submitter ★☆☆☆

ClinVar · 1 submitter

AlphaMissense

likely benign

0.222 · ACMG-weighted

gnomAD v4.1

Rare

very rare (popmax 0.00178%, nfe)

Missense predictors

0/2 damaging

AlphaMissense, SaProt · REVEL no call

Computational evidence

Protein change
AlphaMissense	0.222	likely benign
REVEL	0.437	indeterminate
SaProt	LLR -9.00	tolerated
⇒ AlphaMissense and SaProt both call this tolerated; REVEL makes no call.
Splicing
SpliceAI	—	not assessed · no allele here is in the release
Constraint at this position
Conservation	phyloP 4.8	GERP 2, phastCons 1
Regional constraint	o/e 1.08	unconstrained · MANE · 63 kb · p 0.034 · regional, not allelic
Overall
CADD	28.9	PHRED · no single calibrated threshold — expert panels disagree

ClinVar classifies this uncertain; the computational predictors unanimously lean tolerated — a triage signal, not a reclassification

AlphaMissense carries the ACMG weight for missense; REVEL and SaProt are independent agreement signals.

Population frequency

gnomAD v4.1 · exomes + genomes

Grpmax group 0.00178% European (non-Finnish) · 21/1,179,780 alleles

Filtering AF 0.00114% ClinGen BA1/BS1 input FAF95, joint · FAF99 0.000971%

Overall 0.00136% 22/1,613,650 alleles · very rare

Ancestry group	Frequency	1 in
European (non-Finnish)grpmax	0.00178%	56,180
African / African-American	0.00134%	74,880

Rarity supports pathogenicity (ACMG PM2); frequency above a disease-specific BA1/BS1 threshold argues against it. A variant frequent in one ancestry group can be near-absent in others, so a single global figure can mislead.

Variant & gene context

Gene: C8A
Protein: p.Arg196Cys
Coding: c.586C>T
MANE Select: NM_000562
dbSNP: rs142286739
Type: single nucleotide variant
Location: chr1:56881566 (GRCh38)
Gene constraint: LOEUF 1.168 · pLI <0.01 (gnomAD)
Structure: AlphaFold pLDDT 79.58 · 11 PDB
Residue 196: a β-strand; the macpf domain

Full C8A gene report on Sugi Atlas → Gene function, pathways, protein structure, interactions & more

Similar variants

C8A p.Arg196His Uncertain significance ★★ ⚠ same residue
C8A p.Arg196Ser Uncertain significance ★ ⚠ same residue
C8A p.Arg424Ter Pathogenic ★★ same type
C8A p.Arg498Ter Pathogenic/Likely pathogenic ★★ same type
C8A p.Glu466Ter Pathogenic ★★ same type
C8A p.Tyr210Ter Pathogenic/Likely pathogenic ★★ same type
C8A p.Tyr384Ter Pathogenic/Likely pathogenic ★★ same type
C8A p.Arg107Cys Uncertain significance ★★ ⚠ same type

Built on 18 open, versioned datasets — ClinVar, gnomAD, AlphaMissense, REVEL, ClinGen & more — plus Sugi Variant's own cross-source analysis. Source data 2026-01–2026-10, ClinVar 2026-10. Full sources & versions →

Cite Sugi Variant

Gür T. Sugi Variant: A Deterministic Per-Variant Germline Reference from a Knowledge Graph for Humans and AI Agents. 2026. doi:10.5281/zenodo.21509445. This variant: https://sugi.bio/variant/c8a-p-arg196cys (accessed [today's date]).

Preprint & method: sugi.bio/variant/method Machine-readable: this page as Markdown