Is BST1 p.Ser9Trp (c.26C>G) pathogenic?

BST1 p.Ser9Trp (c.26C>G) is classified Uncertain significance in BST1 (ClinVar, Single submitter, 1 submitter; last evaluated 2023-10-02). AlphaMissense: likely benign (0.1404); Very rare (popmax 0.00477%, eas).

How common is BST1 p.Ser9Trp (c.26C>G) in the general population?

BST1 p.Ser9Trp (c.26C>G) is very rare (popmax 0.00477%, eas) (gnomAD).

What do computational predictors say about BST1 p.Ser9Trp (c.26C>G)?

AlphaMissense predicts likely benign (score 0.1404) — an in-silico prediction, not a clinical call.

BST1 p.Ser9Trp

c.26C>G · rs752630803 · VCV3135332

Uncertain significance Single submitter

Classification

Uncertain significance

ClinVar

Review

Single submitter ★☆☆☆

ClinVar · 1 submitter

AlphaMissense

likely benign

0.1404 · ACMG-weighted

gnomAD v4.1

Rare

very rare (popmax 0.00477%, eas)

Missense predictors

0/3 damaging

AlphaMissense, REVEL, SaProt

Computational evidence

Protein change
AlphaMissense	0.1404	likely benign
REVEL	0.142	moderately benign-leaning
SaProt	LLR -7.71	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 -0.6	GERP -1.8
Regional constraint	o/e 1.07	unconstrained · MANE · 29 kb · p 0.17 · regional, not allelic
Overall
CADD	14.75	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.

Population frequency

gnomAD v4.1 · exomes + genomes

Grpmax group 0.00477% East Asian · 2/41,928 alleles

Filtering AF 0.000791% ClinGen BA1/BS1 input FAF95, joint · FAF99 0.000296%

Overall 0.000191% 3/1,567,110 alleles · very rare

Ancestry group	Frequency	1 in
East Asiangrpmax	0.00477%	20,964
Remaining individualsnot grpmax-eligible	0.00165%	60,666

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: BST1
Protein: p.Ser9Trp
Coding: c.26C>G
MANE Select: NM_004334
dbSNP: rs752630803
Type: single nucleotide variant
Location: chr4:15703170 (GRCh38)
Gene constraint: LOEUF 1.638 · pLI <0.01 (gnomAD)
Structure: AlphaFold pLDDT 90.33 · 6 PDB

Full BST1 gene report on Sugi Atlas → Gene function, pathways, protein structure, interactions & more

Similar variants

BST1 p.Arg145= Benign ★★ same type
BST1 p.Gly239Arg Benign ★★ ⚠ same type
BST1 p.Ile101Val Benign ★★ same type
BST1 p.Ala120Thr Uncertain significance ★ ⚠ same type
BST1 p.Ala175Ser Uncertain significance ★ ⚠ same type
BST1 p.Ala175Thr Uncertain significance ★ ⚠ same type
BST1 p.Ala27Val Uncertain significance ★ ⚠ same type
BST1 p.Ala2Thr 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/bst1-p-ser9trp (accessed [today's date]).

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