Is CSMD2 p.Asn661Ser (c.1982A>G) pathogenic?

CSMD2 p.Asn661Ser (c.1982A>G) is classified Uncertain significance in CSMD2 (ClinVar, Single submitter, 1 submitter; last evaluated 2025-03-01). AlphaMissense: likely benign (0.0925); Very rare (popmax 8.47e-05%, nfe).

How common is CSMD2 p.Asn661Ser (c.1982A>G) in the general population?

CSMD2 p.Asn661Ser (c.1982A>G) is very rare (popmax 8.47e-05%, nfe) (gnomAD).

What do computational predictors say about CSMD2 p.Asn661Ser (c.1982A>G)?

AlphaMissense predicts likely benign (score 0.0925) — an in-silico prediction, not a clinical call.

CSMD2 p.Asn661Ser

c.1982A>G · VCV3836835

Uncertain significance Single submitter

Classification

Uncertain significance

ClinVar

Review

Single submitter ★☆☆☆

ClinVar · 1 submitter

AlphaMissense

likely benign

0.0925 · ACMG-weighted

gnomAD v4.1

Rare

very rare (popmax 8.47e-05%, nfe)

Missense predictors

0/2 damaging

AlphaMissense, REVEL

Computational evidence

Protein change
AlphaMissense	0.0925	likely benign
REVEL	0.172	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 7.9	GERP 2.7, phastCons 1
Regional constraint	o/e 0.78	unconstrained · MANE · 331 kb · p 5.5e-29 · regional, not allelic
Overall
CADD	22.7	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 N621S vs ClinVar N661S) — verify the residue.

Population frequency

gnomAD v4.1 · exomes + genomes

Grpmax group 8.47e-05% European (non-Finnish) · 1/1,180,032 alleles

Overall 6.84e-05% 1/1,461,860 alleles · very rare

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.Asn661Ser
Coding: c.1982A>G
MANE Select: NM_001281956
Type: single nucleotide variant
Location: chr1:33743471 (GRCh38)
Gene constraint: LOEUF 0.364 · pLI 1.00 (gnomAD)
Residue 661: the cub 4 domain

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-asn661ser (accessed [today's date]).

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