Is CD1B p.Trp295Arg (c.883T>A) pathogenic?

CD1B p.Trp295Arg (c.883T>A) is classified Uncertain significance in CD1B (ClinVar, Single submitter, 1 submitter; last evaluated 2025-09-26). AlphaMissense: likely pathogenic (0.5861); Ultra-rare (popmax 0.0557%, eas).

How common is CD1B p.Trp295Arg (c.883T>A) in the general population?

CD1B p.Trp295Arg (c.883T>A) is ultra-rare (popmax 0.0557%, eas) (gnomAD).

What do computational predictors say about CD1B p.Trp295Arg (c.883T>A)?

AlphaMissense predicts likely pathogenic (score 0.5861) — an in-silico prediction, not a clinical call.

CD1B p.Trp295Arg

c.883T>A · VCV4650472

Uncertain significance Single submitter

Classification

Uncertain significance

ClinVar

Review

Single submitter ★☆☆☆

ClinVar · 1 submitter

AlphaMissense

likely pathogenic

0.5861 · ACMG-weighted

gnomAD v4.1

Rare

ultra-rare (popmax 0.0557%, eas)

Missense predictors

1/3 damaging

AlphaMissense, REVEL, SaProt

Computational evidence

Protein change
AlphaMissense	0.5861	likely pathogenic
REVEL	0.238	benign-leaning
SaProt	LLR -6.96	tolerated
⇒ AlphaMissense calls this damaging; REVEL and SaProt do not.
Splicing
SpliceAI	—	not assessed · no allele here is in the release
Constraint at this position
Conservation	phyloP 6.6	GERP 0.72, phastCons 1
Regional constraint	o/e 1.23	unconstrained · MANE · 3,184 bp · p 5.6e-06 · regional, not allelic
Overall
CADD	24.1	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 0.0557% East Asian · 25/44,854 alleles

Filtering AF 0.0387% ClinGen BA1/BS1 input FAF95, joint · FAF99 0.033%

Overall 0.00167% 27/1,612,754 alleles · ultra-rare

Ancestry group	Frequency	1 in
East Asiangrpmax	0.0557%	1,794
Remaining individualsnot grpmax-eligible	0.0016%	62,418
European (non-Finnish)	8.48e-05%	1,179,176

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: CD1B
Protein: p.Trp295Arg
Coding: c.883T>A
MANE Select: NM_001764
Type: single nucleotide variant
Location: chr1:158329373 (GRCh38)
Gene constraint: LOEUF 1.334 · pLI <0.01 (gnomAD)
Structure: AlphaFold pLDDT 91.00 · 28 PDB
Residue 295: the ig-like domain

Full CD1B gene report on Sugi Atlas → Gene function, pathways, protein structure, interactions & more

Similar variants

CD1B p.Gly104Ser Benign ★★ same type
CD1B p.Gly247Ser Benign ★★ ⚠ same type
CD1B p.Phe76= Benign ★★ same type
CD1C p.Arg283Thr Likely benign ★★ same type
CD1C p.Gln23= Benign ★★ same type
CD1C p.Phe300Ser Benign ★★ same type
CD1C p.Val282Leu Likely benign ★★ ⚠ same type
CD1C p.Val318= 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/cd1b-p-trp295arg (accessed [today's date]).

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