Is CD3G c.307+8A>G pathogenic?

CD3G c.307+8A>G is classified Likely benign in CD3G (ClinVar, Single submitter, 1 submitter; last evaluated 2024-10-15). Very rare (popmax 8.55e-05%, nfe); Associated with combined immunodeficiency due to CD3gamma deficiency.

What condition is associated with CD3G c.307+8A>G?

CD3G c.307+8A>G is associated with combined immunodeficiency due to CD3gamma deficiency (ClinVar).

How common is CD3G c.307+8A>G in the general population?

CD3G c.307+8A>G is very rare (popmax 8.55e-05%, nfe) (gnomAD).

CD3G c.307+8A>G

Q: How is Combined immunodeficiency due to CD3gamma deficiency inherited?

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

VCV3612883

Likely benign Single submitter

Classification

Likely benign

ClinVar

Review

Single submitter ★☆☆☆

ClinVar · 1 submitter

gnomAD v4.1

Rare

very rare (popmax 8.55e-05%, nfe)

Conditions

combined immunodeficiency due to CD3gamma deficiency

Computational evidence

Protein change
Missense predictors do not apply to this variant type; conservation carries the signal.
Splicing
Splice region	donor +8	near-intronic (+8 nt from the splice site)
SpliceAI	—	not assessed · no allele here is in the release
Constraint at this position
Conservation	phyloP 0.43	GERP -1
Non-coding constraint	Z 3.00	1 kb window · o/e 0.79 · regional · uncalibrated
Overall
CADD	7.684	PHRED · no single calibrated threshold — expert panels disagree

Population frequency

gnomAD v4.1 · exomes + genomes

Grpmax group 8.55e-05% European (non-Finnish) · 1/1,170,084 alleles

Overall 0.000138% 2/1,450,720 alleles · very rare

Ancestry group	Frequency	1 in
Finnishnot grpmax-eligible	0.00157%	63,790
European (non-Finnish)grpmax	8.55e-05%	1,170,085

Finnish shows a higher raw frequency than the grpmax group above it. gnomAD excludes bottlenecked groups — Finnish, Ashkenazi Jewish, Amish and “Remaining individuals” — from grpmax, because founder effects make their frequencies unrepresentative for filtering. The table is sorted by frequency, so an excluded group can sit above the grpmax row.

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: CD3G
Coding: c.307+8A>G
MANE Select: NM_000073
Type: single nucleotide variant
Location: chr11:118349978 (GRCh38)
Gene constraint: LOEUF 1.191 · pLI <0.01 · ClinGen HI gene assoc. with recessive phenotype (gnomAD)
Structure: AlphaFold pLDDT 75.05 · 38 PDB

Full CD3G gene report on Sugi Atlas → Gene function, pathways, protein structure, interactions & more

Disease context

combined immunodeficiency due to CD3gamma deficiency — disease report on Sugi Atlas → Associated genes, phenotypes, clinical trials & treatments

For Combined immunodeficiency due to CD3gamma deficiency (Orphanet):

Inheritance: Autosomal recessive
Onset: Infancy

Similar variants

CD3G c.55+1G>T Likely pathogenic ★★ same condition
CD3G c.56-1G>A Likely pathogenic ★★ same condition
CD3G p.Lys69Ter Pathogenic ★★ same condition
CD3G p.Met1Val Pathogenic/Likely pathogenic ★★ same condition
CD3G c.*308G>A Uncertain significance ★★ same condition
CD3G p.Arg146Thr Uncertain significance ★★ ⚠ same condition
CD3G p.Arg166Gln Uncertain significance ★★ ⚠ same condition
CD3G p.Asn156Ser 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/cd3g-c-307-plus-8a-g (accessed [today's date]).

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