Is AHNAK2 p.Arg628Cys (c.1882C>T) pathogenic?

AHNAK2 p.Arg628Cys (c.1882C>T) is classified Uncertain significance in AHNAK2 (ClinVar, Single submitter, 1 submitter; last evaluated 2025-10-18). AlphaMissense: likely benign (0.2063); Ultra-rare (popmax 0.0461%, sas).

How common is AHNAK2 p.Arg628Cys (c.1882C>T) in the general population?

AHNAK2 p.Arg628Cys (c.1882C>T) is ultra-rare (popmax 0.0461%, sas) (gnomAD).

What do computational predictors say about AHNAK2 p.Arg628Cys (c.1882C>T)?

AlphaMissense predicts likely benign (score 0.2063) — an in-silico prediction, not a clinical call.

AHNAK2 p.Arg628Cys

c.1882C>T · VCV4639271

Uncertain significance Single submitter

Classification

Uncertain significance

ClinVar

Review

Single submitter ★☆☆☆

ClinVar · 1 submitter

AlphaMissense

likely benign

0.2063 · ACMG-weighted

gnomAD v4.1

Rare

ultra-rare (popmax 0.0461%, sas)

Missense predictors

0/2 damaging

AlphaMissense, REVEL · SaProt no call

Computational evidence

Protein change
AlphaMissense	0.2063	likely benign
REVEL	0.141	moderately benign-leaning
SaProt	—	not scored · why
⇒ AlphaMissense and REVEL both call this tolerated; SaProt makes no call.
Splicing
SpliceAI	—	not assessed · no allele here is in the release
Constraint at this position
Conservation	phyloP -1.6	GERP -2.2
Regional constraint	o/e 1.23	unconstrained · MANE · 32 kb · p 4.7e-50 · regional, not allelic
Overall
CADD	5.662	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 is an independent agreement signal.

Population frequency

gnomAD v4.1 · exomes + genomes

Grpmax group 0.0461% South Asian · 42/91,090 alleles

Filtering AF 0.035% ClinGen BA1/BS1 input FAF95, joint · FAF99 0.0311%

Overall 0.00459% 74/1,613,796 alleles · ultra-rare exomes 67/1,461,704 · genomes 7/152,092 · joint denominator

Ancestry group	Frequency	1 in
South Asiangrpmax	0.0461%	2,169
Admixed American	0.00667%	14,998
Remaining individualsnot grpmax-eligible	0.0064%	15,616
Ashkenazi Jewishnot grpmax-eligible	0.00338%	29,606
East Asian	0.00223%	44,892
European (non-Finnish)	0.00178%	56,186
African / African-American	0.00134%	74,884

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: AHNAK2
Protein: p.Arg628Cys
Coding: c.1882C>T
MANE Select: NM_138420
Type: single nucleotide variant
Location: chr14:104953569 (GRCh38)
Gene constraint: LOEUF 0.917 · pLI <0.01 (gnomAD)
Residue 628: the 'disordered' region

Full AHNAK2 gene report on Sugi Atlas → Gene function, pathways, protein structure, interactions & more

Similar variants

AHNAK2 p.Arg628Leu Uncertain significance ★ ⚠ same residue
AHNAK2 p.Arg628Pro Uncertain significance ★ ⚠ same residue
AHNAK2 p.Glu3598Lys Uncertain significance ★★ ⚠ same type
AHNAK2 p.Gly4376Ser Uncertain significance ★★ ⚠ same type
AHNAK2 p.Lys2479Arg Uncertain significance ★★ ⚠ same type
AHNAK2 p.Lys3309Asn Uncertain significance ★★ ⚠ same type
AHNAK2 p.Val1351Met Uncertain significance ★★ ⚠ same type
AHNAK2 p.Ala1115Val Benign/Likely benign ★★ 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/ahnak2-p-arg628cys (accessed [today's date]).

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