Is CD79B p.Asn101= (c.303C>T) pathogenic?

CD79B p.Asn101= (c.303C>T) is classified Likely benign in CD79B (ClinVar, Single submitter, 1 submitter; last evaluated 2025-07-09). Ultra-rare (popmax 0.04%, afr); Associated with agammaglobulinemia 6, autosomal recessive.

What condition is associated with CD79B p.Asn101= (c.303C>T)?

CD79B p.Asn101= (c.303C>T) is associated with agammaglobulinemia 6, autosomal recessive (ClinVar).

How common is CD79B p.Asn101= (c.303C>T) in the general population?

CD79B p.Asn101= (c.303C>T) is ultra-rare (popmax 0.04%, afr) (gnomAD).

CD79B p.Asn101=

c.303C>T · rs115494685 · VCV742724

Likely benign Single submitter

Classification

Likely benign

ClinVar

Review

Single submitter ★☆☆☆

ClinVar · 1 submitter

gnomAD v4.1

Rare

ultra-rare (popmax 0.04%, afr)

Conditions

agammaglobulinemia 6, autosomal recessive

Computational evidence

Protein change
Missense predictors do not apply to this variant type; conservation carries the signal.
Splicing
SpliceAI	—	not assessed · no allele here is in the release
Constraint at this position
Conservation	phyloP -1.9	GERP -4.3
Overall
CADD	3.705	PHRED · no single calibrated threshold — expert panels disagree

Population frequency

gnomAD v4.1 · exomes + genomes

Grpmax group 0.04% African / African-American · 30/75,054 alleles

Filtering AF 0.0288% ClinGen BA1/BS1 input FAF95, joint · FAF99 0.0249%

Overall 0.00266% 43/1,614,204 alleles · ultra-rare

Ancestry group	Frequency	1 in
African / African-Americangrpmax	0.04%	2,502
East Asian	0.00668%	14,962
South Asian	0.00329%	30,361
Remaining individualsnot grpmax-eligible	0.0032%	31,256
Admixed American	0.00167%	60,022
European (non-Finnish)	0.000339%	295,010

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: CD79B
Protein: p.Asn101=
Coding: c.303C>T
MANE Select: NM_000626
dbSNP: rs115494685
Type: single nucleotide variant
Location: chr17:63930201 (GRCh38)
Gene constraint: LOEUF 0.421 · pLI 1.00 (gnomAD)
Structure: AlphaFold pLDDT 76.02 · 6 PDB
Residue 101: a disulfide bond; the ig-like v-type domain

Full CD79B gene report on Sugi Atlas → Gene function, pathways, protein structure, interactions & more

Disease context

agammaglobulinemia 6, autosomal recessive — disease report on Sugi Atlas → Associated genes, phenotypes, clinical trials & treatments

Similar variants

CD79B p.Ala5Val Uncertain significance ★★ ⚠ same condition
CD79B p.Arg36Trp Uncertain significance ★★ ⚠ same condition
CD79B p.Gly216Arg Uncertain significance ★★ ⚠ same condition
CD79B p.Leu91Pro Uncertain significance ★★ ⚠ same condition
CD79B p.Met96Val Uncertain significance ★★ ⚠ same condition
CD79B p.Thr212Met Uncertain significance ★★ ⚠ same condition
CD79B p.Val175Met Uncertain significance ★★ ⚠ same condition
CD79B c.118+12C>T Benign/Likely benign ★★ 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/cd79b-p-asn101 (accessed [today's date]).

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