Is CD79A p.Tyr104= (c.312C>T) pathogenic?

CD79A p.Tyr104= (c.312C>T) is classified Likely benign in CD79A (ClinVar, Multiple submitters, 2 submitters; last evaluated 2025-04-17). Ultra-rare (popmax 0.0373%, afr); Associated with agammaglobulinemia 3, autosomal recessive.

What condition is associated with CD79A p.Tyr104= (c.312C>T)?

CD79A p.Tyr104= (c.312C>T) is associated with agammaglobulinemia 3, autosomal recessive (ClinVar).

How common is CD79A p.Tyr104= (c.312C>T) in the general population?

CD79A p.Tyr104= (c.312C>T) is ultra-rare (popmax 0.0373%, afr) (gnomAD).

CD79A p.Tyr104=

c.312C>T · rs200667174 · VCV753741

Likely benign Multiple submitters

Classification

Likely benign

ClinVar

Review

Multiple submitters ★★☆☆

ClinVar · 2 submitters

gnomAD v4.1

Rare

ultra-rare (popmax 0.0373%, afr)

Conditions

agammaglobulinemia 3, autosomal recessive

Computational evidence

Protein change
Missense predictors do not apply to this variant type; conservation carries the signal.
Splicing
SpliceAI	<0.2	all four deltas below 0.2 · C>G here scores Δ0.27 · evaluated, not missing
Constraint at this position
Conservation	phyloP 0.75	GERP -0.56, phastCons 0.21
Overall
CADD	9.697	PHRED · no single calibrated threshold — expert panels disagree

Population frequency

gnomAD v4.1 · exomes + genomes

Grpmax group 0.0373% African / African-American · 28/75,036 alleles

Filtering AF 0.0265% ClinGen BA1/BS1 input FAF95, joint · FAF99 0.0229%

Overall 0.00359% 58/1,613,786 alleles · ultra-rare

Ancestry group	Frequency	1 in
African / African-Americangrpmax	0.0373%	2,680
Remaining individualsnot grpmax-eligible	0.008%	12,501
East Asian	0.00446%	22,439
South Asian	0.0022%	45,542
European (non-Finnish)	0.00169%	58,998
Admixed American	0.00167%	60,020

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: CD79A
Protein: p.Tyr104=
Coding: c.312C>T
MANE Select: NM_001783
dbSNP: rs200667174
Type: single nucleotide variant
Location: chr19:41879222 (GRCh38)
Gene constraint: LOEUF 0.991 · pLI <0.01 (gnomAD)
Structure: AlphaFold pLDDT 77.56 · 6 PDB
Residue 104: a disulfide bond; a β-strand; the ig-like c2-type domain

Full CD79A gene report on Sugi Atlas → Gene function, pathways, protein structure, interactions & more

Disease context

agammaglobulinemia 3, autosomal recessive — disease report on Sugi Atlas → Associated genes, phenotypes, clinical trials & treatments

Similar variants

CD79A p.Tyr104His Uncertain significance ★ ⚠ same residue
CD79A p.Arg124Cys Uncertain significance ★★ ⚠ same condition
CD79A p.Arg124His Uncertain significance ★★ ⚠ same condition
CD79A p.Arg168Gln Uncertain significance ★★ ⚠ same condition
CD79A p.Arg204Gln Uncertain significance ★★ ⚠ same condition
CD79A p.Asn60Ser Uncertain significance ★★ ⚠ same condition
CD79A p.Asn63Ser Uncertain significance ★★ ⚠ same condition
CD79A p.Gly179Arg 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/cd79a-p-tyr104 (accessed [today's date]).

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