Is CHRNB2 p.Ala455Ser (c.1363G>T) pathogenic?

CHRNB2 p.Ala455Ser (c.1363G>T) is classified Uncertain significance in CHRNB2 (ClinVar, Single submitter, 1 submitter; last evaluated 2025-06-06). AlphaMissense: likely pathogenic (0.5895); Absent from gnomAD v4.1.

How common is CHRNB2 p.Ala455Ser (c.1363G>T) in the general population?

CHRNB2 p.Ala455Ser (c.1363G>T) is absent from gnomAD v4.1 (gnomAD).

What do computational predictors say about CHRNB2 p.Ala455Ser (c.1363G>T)?

AlphaMissense predicts likely pathogenic (score 0.5895) — an in-silico prediction, not a clinical call.

CHRNB2 p.Ala455Ser

c.1363G>T · VCV4536216

Uncertain significance Single submitter

Classification

Uncertain significance

ClinVar

Review

Single submitter ★☆☆☆

ClinVar · 1 submitter

AlphaMissense

likely pathogenic

0.5895 · ACMG-weighted

gnomAD v4.1

Absent

absent from gnomAD v4.1

Missense predictors

2/3 damaging

AlphaMissense, REVEL, SaProt

Computational evidence

Protein change
AlphaMissense	0.5895	likely pathogenic
REVEL	0.77	pathogenic-leaning
SaProt	LLR -10.00	tolerated
⇒ AlphaMissense and REVEL call this damaging; SaProt does not.
Splicing
SpliceAI	—	not assessed · no allele here is in the release
Constraint at this position
Conservation	phyloP 12	GERP 2, phastCons 1
Regional constraint	o/e 1.09	unconstrained · MANE · 4,110 bp · p 0.17 · regional, not allelic
Overall
CADD	26.5	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

Absent from gnomAD v4.1. Not observed in any sequenced alleles — a rarity signal (ACMG PM2-supporting), not evidence of pathogenicity on its own.

Variant & gene context

Gene: CHRNB2
Protein: p.Ala455Ser
Coding: c.1363G>T
MANE Select: NM_000748
Type: single nucleotide variant
Location: chr1:154575786 (GRCh38)
Gene constraint: LOEUF 1.116 · pLI <0.01 (gnomAD)
Structure: AlphaFold pLDDT 81.16 · 15 PDB
Residue 455: an α-helix

Full CHRNB2 gene report on Sugi Atlas → Gene function, pathways, protein structure, interactions & more

Similar variants

CHRNB2 p.Ala455Thr Uncertain significance ★★ ⚠ same residue
CHRNB2 p.Ala455Val Uncertain significance ★ ⚠ same residue
CHRNB2 p.Ala455= Likely benign ★ same residue
CHRNB2 p.Val287Leu Pathogenic/Likely pathogenic ★★ same type
CHRNB2 p.Val287Met Pathogenic ★★ same type
CHRNB2 p.Val308Ala Pathogenic/Likely pathogenic ★★ same type
CHRNB2 c.1338+3G>T Uncertain significance ★★ same type
CHRNB2 c.366-3C>T 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/chrnb2-p-ala455ser (accessed [today's date]).

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