Is CCAR1 p.Arg300Gln (c.899G>A) pathogenic?

CCAR1 p.Arg300Gln (c.899G>A) is classified Uncertain significance in CCAR1 (ClinVar, Single submitter, 1 submitter; last evaluated 2024-03-29). AlphaMissense: likely pathogenic (0.6281); Very rare (popmax 0.00364%, nfe).

How common is CCAR1 p.Arg300Gln (c.899G>A) in the general population?

CCAR1 p.Arg300Gln (c.899G>A) is very rare (popmax 0.00364%, nfe) (gnomAD).

What do computational predictors say about CCAR1 p.Arg300Gln (c.899G>A)?

AlphaMissense predicts likely pathogenic (score 0.6281) — an in-silico prediction, not a clinical call.

CCAR1 p.Arg300Gln

c.899G>A · VCV3263738

Uncertain significance Single submitter

Classification

Uncertain significance

ClinVar

Review

Single submitter ★☆☆☆

ClinVar · 1 submitter

AlphaMissense

likely pathogenic

0.6281 · ACMG-weighted

gnomAD v4.1

Rare

very rare (popmax 0.00364%, nfe)

Missense predictors

1/3 damaging

AlphaMissense, REVEL, SaProt

Computational evidence

Protein change
AlphaMissense	0.6281	likely pathogenic
REVEL	0.166	moderately benign-leaning
SaProt	LLR -7.56	tolerated
⇒ AlphaMissense calls this damaging; REVEL and SaProt do not.
Splicing
SpliceAI	—	not assessed · no allele here is in the release
Constraint at this position
Conservation	phyloP 12	GERP 2.2, phastCons 1
Regional constraint	o/e 0.71	unconstrained · MANE · 44 kb · p 4.8e-18 · regional, not allelic
Overall
CADD	28.0	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 0.00364% European (non-Finnish) · 43/1,179,798 alleles

Filtering AF 0.00275% ClinGen BA1/BS1 input FAF95, joint · FAF99 0.00244%

Overall 0.00279% 45/1,613,006 alleles · very rare

Ancestry group	Frequency	1 in
European (non-Finnish)grpmax	0.00364%	27,437
Remaining individualsnot grpmax-eligible	0.0016%	62,458
African / African-American	0.00134%	74,864

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: CCAR1
Protein: p.Arg300Gln
Coding: c.899G>A
MANE Select: NM_018237
Type: single nucleotide variant
Location: chr10:68749208 (GRCh38)
Gene constraint: LOEUF 0.651 · pLI <0.01 (gnomAD)
Structure: AlphaFold pLDDT 69.55
Residue 300: the 'interaction with gata2' region; the 'disordered' region

Full CCAR1 gene report on Sugi Atlas → Gene function, pathways, protein structure, interactions & more

Similar variants

CCAR1 c.1625+1G>A Uncertain significance ★ same type
CCAR1 p.Ala2Val Uncertain significance ★ ⚠ same type
CCAR1 p.Ala499Asp Uncertain significance ★ ⚠ same type
CCAR1 p.Ala878Ser Uncertain significance ★ ⚠ same type
CCAR1 p.Arg307Thr Uncertain significance ★ ⚠ same type
CCAR1 p.Arg327His Uncertain significance ★ ⚠ same type
CCAR1 p.Arg340Leu Uncertain significance ★ ⚠ same type
CCAR1 p.Arg345Gln 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/ccar1-p-arg300gln (accessed [today's date]).

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