Is BPI p.Ala26Val (c.77C>T) pathogenic?

BPI p.Ala26Val (c.77C>T) is classified Uncertain significance in BPI (ClinVar, Single submitter, 1 submitter; last evaluated 2021-10-27). AlphaMissense: likely benign (0.12); Ultra-rare (popmax 0.033%, mid).

How common is BPI p.Ala26Val (c.77C>T) in the general population?

BPI p.Ala26Val (c.77C>T) is ultra-rare (popmax 0.033%, mid) (gnomAD).

What do computational predictors say about BPI p.Ala26Val (c.77C>T)?

AlphaMissense predicts likely benign (score 0.12) — an in-silico prediction, not a clinical call.

BPI p.Ala26Val

c.77C>T · rs771157781 · VCV2217830

Uncertain significance Single submitter

Classification

Uncertain significance

ClinVar

Review

Single submitter ★☆☆☆

ClinVar · 1 submitter

AlphaMissense

likely benign

0.12 · ACMG-weighted

gnomAD v4.1

Rare

ultra-rare (popmax 0.033%, mid)

Missense predictors

0/3 damaging

AlphaMissense, REVEL, SaProt

Computational evidence

Protein change
AlphaMissense	0.12	likely benign
REVEL	0.028	moderately benign-leaning
SaProt	LLR -7.51	tolerated
⇒ AlphaMissense, REVEL and SaProt all call this tolerated.
Splicing
SpliceAI	—	not assessed · no allele here is in the release
Constraint at this position
Conservation	phyloP -1.9	GERP -3.9
Regional constraint	o/e 1.07	unconstrained · MANE · 33 kb · p 0.094 · regional, not allelic
Overall
CADD	2.994	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 A30V vs ClinVar A26V) — verify the residue.

Population frequency

gnomAD v4.1 · exomes + genomes

Grpmax group 0.033% Middle Eastern · 2/6,058 alleles

Filtering AF 0.00582% ClinGen BA1/BS1 input FAF95, joint · FAF99 0.00242%

Overall 0.000479% 7/1,461,854 alleles · ultra-rare

Ancestry group	Frequency	1 in
Middle Easterngrpmax	0.033%	3,029
South Asian	0.00549%	18,216

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: BPI
Protein: p.Ala26Val
Coding: c.77C>T
MANE Select: NM_001725
dbSNP: rs771157781
Type: single nucleotide variant
Location: chr20:38304300 (GRCh38)
Gene constraint: LOEUF 1.011 · pLI <0.01 (gnomAD)
Structure: AlphaFold pLDDT 92.70 · 2 PDB

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

Similar variants

BPI c.664+7G>T Benign ★★ same type
BPI p.Ala12Val Benign ★★ same type
BPI p.Ala192Val Benign ★★ same type
BPI p.Ala333Thr Likely benign ★★ ⚠ same type
BPI p.Ala8Thr Benign ★★ same type
BPI p.Ala8Val Benign ★★ same type
BPI p.Arg86Cys Benign ★★ ⚠ same type
BPI p.Glu136Gln 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/bpi-p-ala26val (accessed [today's date]).

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