Is CSMD2 p.Ala3276Val (c.9827C>T) pathogenic?

CSMD2 p.Ala3276Val (c.9827C>T) is classified Uncertain significance in CSMD2 (ClinVar, Single submitter, 1 submitter; last evaluated 2025-12-11). AlphaMissense: likely benign (0.0754); Ultra-rare (popmax 0.0889%, sas).

How common is CSMD2 p.Ala3276Val (c.9827C>T) in the general population?

CSMD2 p.Ala3276Val (c.9827C>T) is ultra-rare (popmax 0.0889%, sas) (gnomAD).

What do computational predictors say about CSMD2 p.Ala3276Val (c.9827C>T)?

AlphaMissense predicts likely benign (score 0.0754) — an in-silico prediction, not a clinical call.

CSMD2 p.Ala3276Val

c.9827C>T · VCV4657090

Uncertain significance Single submitter

Classification

Uncertain significance

ClinVar

Review

Single submitter ★☆☆☆

ClinVar · 1 submitter

AlphaMissense

likely benign

0.0754 · ACMG-weighted

gnomAD v4.1

Rare

ultra-rare (popmax 0.0889%, sas)

Missense predictors

0/2 damaging

AlphaMissense, REVEL

Computational evidence

Protein change
AlphaMissense	0.0754	likely benign
REVEL	0.035	moderately benign-leaning
⇒ AlphaMissense and REVEL both call this tolerated.
Splicing
SpliceAI	—	not assessed · no allele here is in the release
Constraint at this position
Conservation	phyloP 4.5	GERP 1.9, phastCons 0.92
Regional constraint	o/e 0.76	unconstrained · MANE · 48 kb · p 3.4e-16 · regional, not allelic
Overall
CADD	15.22	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.

⚠ Isoform check: AlphaMissense numbered on a different transcript (AM A3132V vs ClinVar A3276V) — verify the residue.

Population frequency

gnomAD v4.1 · exomes + genomes

Grpmax group 0.0889% South Asian · 81/91,084 alleles

Filtering AF 0.0733% ClinGen BA1/BS1 input FAF95, joint · FAF99 0.0675%

Overall 0.00564% 91/1,614,146 alleles · ultra-rare

Ancestry group	Frequency	1 in
South Asiangrpmax	0.0889%	1,124
Remaining individualsnot grpmax-eligible	0.0096%	10,419
European (non-Finnish)	0.000339%	295,006

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: CSMD2
Protein: p.Ala3276Val
Coding: c.9827C>T
MANE Select: NM_001281956
Type: single nucleotide variant
Location: chr1:33537074 (GRCh38)
Gene constraint: LOEUF 0.364 · pLI 1.00 (gnomAD)

Full CSMD2 gene report on Sugi Atlas → Gene function, pathways, protein structure, interactions & more

Similar variants

CSMD2 p.Pro1506= Likely benign ★★ same type
CSMD2 p.Ser3015= Benign ★★ same type
CSMD2 c.404+2T>A Uncertain significance ★ same type
CSMD2 c.6344-398G>T Uncertain significance ★ same type
CSMD2 c.6344-422A>G Uncertain significance ★ same type
CSMD2 c.6344-423T>C Uncertain significance ★ same type
CSMD2 c.6344-429G>A Uncertain significance ★ same type
CSMD2 c.6344-435G>A 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/csmd2-p-ala3276val (accessed [today's date]).

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