Is CD3D p.Ile26Val (c.76A>G) pathogenic?

CD3D p.Ile26Val (c.76A>G) is classified Uncertain significance in CD3D (ClinVar, Single submitter, 1 submitter; last evaluated 2025-11-24). AlphaMissense: likely benign (0.0485); Very rare (popmax 0.00267%, afr); Associated with immunodeficiency 19.

What condition is associated with CD3D p.Ile26Val (c.76A>G)?

CD3D p.Ile26Val (c.76A>G) is associated with immunodeficiency 19 (ClinVar).

How common is CD3D p.Ile26Val (c.76A>G) in the general population?

CD3D p.Ile26Val (c.76A>G) is very rare (popmax 0.00267%, afr) (gnomAD).

What do computational predictors say about CD3D p.Ile26Val (c.76A>G)?

AlphaMissense predicts likely benign (score 0.0485) — an in-silico prediction, not a clinical call.

CD3D p.Ile26Val

Q: How is T-B+ severe combined immunodeficiency due to CD3delta/CD3epsilon/CD3zeta inherited?

Typically Autosomal recessive (Orphanet). A genetic counselor can assess individual risk for a family.

c.76A>G · rs201374139 · VCV541672

Uncertain significance Single submitter

Classification

Uncertain significance

ClinVar

Review

Single submitter ★☆☆☆

ClinVar · 1 submitter

AlphaMissense

likely benign

0.0485 · ACMG-weighted

gnomAD v4.1

Rare

very rare (popmax 0.00267%, afr)

Missense predictors

0/3 damaging

AlphaMissense, REVEL, SaProt

Conditions

immunodeficiency 19

Computational evidence

Protein change
AlphaMissense	0.0485	likely benign
REVEL	0.037	moderately benign-leaning
SaProt	LLR -5.38	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 0.074	GERP -1.1, phastCons 0.002
Regional constraint	o/e 0.97	unconstrained · MANE · 3,442 bp · p 0.64 · regional, not allelic
Overall
CADD	0.133	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 0.00267% African / African-American · 2/74,860 alleles

Filtering AF 0.00122% ClinGen BA1/BS1 input FAF95, joint · FAF99 0.00104%

Overall 0.00167% 27/1,613,408 alleles · very rare

Ancestry group	Frequency	1 in
African / African-Americangrpmax	0.00267%	37,430
South Asian	0.0022%	45,519
European (non-Finnish)	0.00187%	53,617
Remaining individualsnot grpmax-eligible	0.0016%	62,478

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: CD3D
Protein: p.Ile26Val
Coding: c.76A>G
MANE Select: NM_000732
dbSNP: rs201374139
Type: single nucleotide variant
Location: chr11:118340573 (GRCh38)
Gene constraint: LOEUF 1.325 · pLI <0.01 · ClinGen HI gene assoc. with recessive phenotype (gnomAD)
Structure: AlphaFold pLDDT 77.57 · 31 PDB
Residue 26: a β-strand

Full CD3D gene report on Sugi Atlas → Gene function, pathways, protein structure, interactions & more

Disease context

immunodeficiency 19 — disease report on Sugi Atlas → Associated genes, phenotypes, clinical trials & treatments

For T-B+ severe combined immunodeficiency due to CD3delta/CD3epsilon/CD3zeta (Orphanet):

Inheritance: Autosomal recessive
Onset: Infancy

Similar variants

CD3D p.Ile26Thr Uncertain significance ★ ⚠ same residue
CD3D c.274+5G>A Pathogenic/Likely pathogenic ★★ same condition
CD3D c.407-2A>G Likely pathogenic ★★ same condition
CD3D p.Arg68Ter Pathogenic ★★ same condition
CD3D p.Cys93Ter Pathogenic ★★ same condition
CD3D c.274+4C>T Uncertain significance ★★ same condition
CD3D c.450+6C>T Uncertain significance ★★ same condition
CD3D p.Ala119Asp Uncertain significance ★★ ⚠ same condition

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/cd3d-p-ile26val (accessed [today's date]).

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