Is CMAS p.Arg175His (c.524G>A) pathogenic?

CMAS p.Arg175His (c.524G>A) is classified Uncertain significance in CMAS (ClinVar, Single submitter, 1 submitter; last evaluated 2025-01-22). AlphaMissense: ambiguous (0.5487); Very rare (popmax 0.00401%, afr).

How common is CMAS p.Arg175His (c.524G>A) in the general population?

CMAS p.Arg175His (c.524G>A) is very rare (popmax 0.00401%, afr) (gnomAD).

What do computational predictors say about CMAS p.Arg175His (c.524G>A)?

AlphaMissense predicts ambiguous (score 0.5487) — an in-silico prediction, not a clinical call.

CMAS p.Arg175His

c.524G>A · VCV3834275

Uncertain significance Single submitter

Classification

Uncertain significance

ClinVar

Review

Single submitter ★☆☆☆

ClinVar · 1 submitter

AlphaMissense

ambiguous

0.5487 · ACMG-weighted

gnomAD v4.1

Rare

very rare (popmax 0.00401%, afr)

Computational evidence

Protein change
AlphaMissense	0.5487	ambiguous
REVEL	0.317	indeterminate
SaProt	LLR -9.14	tolerated
Splicing
SpliceAI	—	not assessed · no allele here is in the release
Constraint at this position
Conservation	phyloP 9.9	GERP 1.3, phastCons 1
Regional constraint	o/e 0.56	unconstrained · MANE · 6,214 bp · p 4.4e-12 · regional, not allelic
Overall
CADD	25.8	PHRED · no single calibrated threshold — expert panels disagree

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

Population frequency

gnomAD v4.1 · exomes + genomes

Grpmax group 0.00401% African / African-American · 3/74,878 alleles

Filtering AF 0.00153% ClinGen BA1/BS1 input FAF95, joint · FAF99 0.0013%

Overall 0.00193% 31/1,609,884 alleles · very rare

Ancestry group	Frequency	1 in
African / African-Americangrpmax	0.00401%	24,959
European (non-Finnish)	0.00221%	45,347
Admixed American	0.00169%	59,212
South Asian	0.00112%	89,570

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: CMAS
Protein: p.Arg175His
Coding: c.524G>A
MANE Select: NM_018686
Type: single nucleotide variant
Location: chr12:22055575 (GRCh38)
Gene constraint: LOEUF 0.566 · pLI 0.83 (gnomAD)
Structure: AlphaFold pLDDT 88.10

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

Similar variants

CMAS p.Arg175Cys Uncertain significance ★ ⚠ same residue
CMAS p.Lys26= Benign ★★ same type
CMAS p.Tyr403= Benign/Likely benign ★★ same type
CMAS p.Ala328Pro Uncertain significance ★ ⚠ same type
CMAS p.Arg18Leu Uncertain significance ★ ⚠ same type
CMAS p.Arg203Cys Uncertain significance ★ ⚠ same type
CMAS p.Arg241Gln Uncertain significance ★ ⚠ same type
CMAS p.Arg415Gln 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/cmas-p-arg175his (accessed [today's date]).

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