Is ANK2 p.Pro665Ser (c.1993C>T) pathogenic?

ANK2 p.Pro665Ser (c.1993C>T) is classified Conflicting classifications of pathogenicity in ANK2 (ClinVar, Conflicting submitters, 3 submitters; last evaluated 2025-04-14). AlphaMissense: ambiguous (0.4663); Very rare (popmax 0.00873%, nfe); Associated with long QT syndrome.

What condition is associated with ANK2 p.Pro665Ser (c.1993C>T)?

ANK2 p.Pro665Ser (c.1993C>T) is associated with long QT syndrome, cardiac arrhythmia, ankyrin-B-related (ClinVar).

How common is ANK2 p.Pro665Ser (c.1993C>T) in the general population?

ANK2 p.Pro665Ser (c.1993C>T) is very rare (popmax 0.00873%, nfe) (gnomAD).

What do computational predictors say about ANK2 p.Pro665Ser (c.1993C>T)?

AlphaMissense predicts ambiguous (score 0.4663) — an in-silico prediction, not a clinical call.

ANK2 p.Pro665Ser

c.1993C>T · rs758281393 · VCV1024600

Conflicting classifications of pathogenicity Conflicting submitters

Classification

Conflicting classifications of pathogenicity

ClinVar

Review

Conflicting submitters ★☆☆☆

ClinVar · 3 submitters

AlphaMissense

ambiguous

0.4663 · ACMG-weighted

gnomAD v4.1

Rare

very rare (popmax 0.00873%, nfe)

Conditions

long QT syndrome

Computational evidence

Protein change
AlphaMissense	0.4663	ambiguous
REVEL	0.708	pathogenic-leaning
Splicing
SpliceAI	—	not assessed · no allele here is in the release
Constraint at this position
Conservation	phyloP 3.3	GERP 1.6, phastCons 1
Regional constraint	o/e 0.77	unconstrained · MANE · 98 kb · p 4.4e-21 · regional, not allelic
Overall
CADD	23.1	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 0.00873% European (non-Finnish) · 103/1,179,954 alleles

Filtering AF 0.00733% ClinGen BA1/BS1 input FAF95, joint · FAF99 0.00684%

Overall 0.00669% 108/1,613,854 alleles · very rare

Ancestry group	Frequency	1 in
European (non-Finnish)grpmax	0.00873%	11,456
Remaining individualsnot grpmax-eligible	0.008%	12,496

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: ANK2
Protein: p.Pro665Ser
Coding: c.1993C>T
MANE Select: NM_001148
dbSNP: rs758281393
Type: single nucleotide variant
Location: chr4:113282786 (GRCh38)
Gene constraint: LOEUF 0.271 · pLI 1.00 · ClinGen HI 3/3 (gnomAD)
Residue 665: an α-helix

Full ANK2 gene report on Sugi Atlas → Gene function, pathways, protein structure, interactions & more

Disease context

long QT syndrome — disease report on Sugi Atlas → Associated genes, phenotypes, clinical trials & treatments

Also linked: cardiac arrhythmia, ankyrin-B-related

Similar variants

ANK2 p.Pro665Gln Uncertain significance ★★ ⚠ same residue
ANK2 p.Pro665= Benign/Likely benign ★★ same residue
ANK2 p.Arg1007Ter Pathogenic/Likely pathogenic ★★ same condition
ANK2 p.Arg1088Ter Pathogenic ★★ same condition
ANK2 p.Arg3113Ter Pathogenic ★★ same condition
ANK2 c.11032+11G>T Uncertain significance ★★ same condition
ANK2 c.11611-3T>A Uncertain significance ★★ same condition
ANK2 c.1783-3C>T Uncertain significance ★★ same condition

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/ank2-p-pro665ser (accessed [today's date]).

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