Is CD1B p.Arg219Pro (c.656G>C) pathogenic?

CD1B p.Arg219Pro (c.656G>C) is classified Uncertain significance in CD1B (ClinVar, Single submitter, 1 submitter; last evaluated 2023-02-08). AlphaMissense: likely benign (0.3391); Very rare (popmax 0.00339%, nfe).

How common is CD1B p.Arg219Pro (c.656G>C) in the general population?

CD1B p.Arg219Pro (c.656G>C) is very rare (popmax 0.00339%, nfe) (gnomAD).

What do computational predictors say about CD1B p.Arg219Pro (c.656G>C)?

AlphaMissense predicts likely benign (score 0.3391) — an in-silico prediction, not a clinical call.

CD1B p.Arg219Pro

c.656G>C · rs137886679 · VCV2482366

Uncertain significance Single submitter

Classification

Uncertain significance

ClinVar

Review

Single submitter ★☆☆☆

ClinVar · 1 submitter

AlphaMissense

likely benign

0.3391 · ACMG-weighted

gnomAD v4.1

Rare

very rare (popmax 0.00339%, nfe)

Missense predictors

1/3 damaging

AlphaMissense, REVEL, SaProt

Computational evidence

Protein change
AlphaMissense	0.3391	likely benign
REVEL	0.099	moderately benign-leaning
SaProt	LLR -15.71	damaging
⇒ SaProt calls this damaging; AlphaMissense and REVEL do not.
Splicing
SpliceAI	—	not assessed · no allele here is in the release
Constraint at this position
Conservation	phyloP -20	GERP -3.7
Regional constraint	o/e 1.23	unconstrained · MANE · 3,184 bp · p 5.6e-06 · regional, not allelic
Overall
CADD	19.77	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 0.00339% European (non-Finnish) · 40/1,180,032 alleles

Filtering AF 0.00255% ClinGen BA1/BS1 input FAF95, joint · FAF99 0.00225%

Overall 0.00274% 40/1,461,890 alleles · very rare

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.Arg219Pro
Coding: c.656G>C
MANE Select: NM_001764
dbSNP: rs137886679
Type: single nucleotide variant
Location: chr1:158329600 (GRCh38)
Gene constraint: LOEUF 1.334 · pLI <0.01 (gnomAD)
Structure: AlphaFold pLDDT 91.00 · 28 PDB
Residue 219: a β-strand; the ig-like domain

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

Similar variants

CD1B p.Arg219His Uncertain significance ★ ⚠ same residue
CD1B p.Arg219Leu Uncertain significance ★ ⚠ same residue
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

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-arg219pro (accessed [today's date]).

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