Is CD79B p.Thr166= (c.498G>A) pathogenic?

CD79B p.Thr166= (c.498G>A) is classified Likely benign in CD79B (ClinVar, Single submitter, 1 submitter; last evaluated 2023-01-19). Ultra-rare (popmax 0.0187%, afr); Associated with agammaglobulinemia 6, autosomal recessive.

What condition is associated with CD79B p.Thr166= (c.498G>A)?

CD79B p.Thr166= (c.498G>A) is associated with agammaglobulinemia 6, autosomal recessive (ClinVar).

How common is CD79B p.Thr166= (c.498G>A) in the general population?

CD79B p.Thr166= (c.498G>A) is ultra-rare (popmax 0.0187%, afr) (gnomAD).

CD79B p.Thr166=

c.498G>A · rs141754572 · VCV1088512

Likely benign Single submitter

Classification

Likely benign

ClinVar

Review

Single submitter ★☆☆☆

ClinVar · 1 submitter

gnomAD v4.1

Rare

ultra-rare (popmax 0.0187%, 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 0.013	GERP -3.9, phastCons 0.47
Overall
CADD	9.023	PHRED · no single calibrated threshold — expert panels disagree

Population frequency

gnomAD v4.1 · exomes + genomes

Grpmax group 0.0187% African / African-American · 14/74,916 alleles

Filtering AF 0.0112% ClinGen BA1/BS1 input FAF95, joint · FAF99 0.00905%

Overall 0.00335% 54/1,613,178 alleles · ultra-rare

Ancestry group	Frequency	1 in
African / African-Americangrpmax	0.0187%	5,351
Remaining individualsnot grpmax-eligible	0.0048%	20,819
South Asian	0.00439%	22,769
European (non-Finnish)	0.0028%	35,750

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.Thr166=
Coding: c.498G>A
MANE Select: NM_000626
dbSNP: rs141754572
Type: single nucleotide variant
Location: chr17:63929821 (GRCh38)
Gene constraint: LOEUF 0.421 · pLI 1.00 (gnomAD)
Structure: AlphaFold pLDDT 76.02 · 6 PDB
Residue 166: an α-helix

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.Thr166Met Uncertain significance ★ ⚠ same residue
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

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-thr166 (accessed [today's date]).

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