Is BLNK p.Pro87= (c.261C>T) pathogenic?

BLNK p.Pro87= (c.261C>T) is classified Likely benign in BLNK (ClinVar, Multiple submitters, 2 submitters; last evaluated 2025-05-21). Very rare (popmax 0.00267%, afr); Associated with agammaglobulinemia 4, autosomal recessive.

What condition is associated with BLNK p.Pro87= (c.261C>T)?

BLNK p.Pro87= (c.261C>T) is associated with agammaglobulinemia 4, autosomal recessive (ClinVar).

How common is BLNK p.Pro87= (c.261C>T) in the general population?

BLNK p.Pro87= (c.261C>T) is very rare (popmax 0.00267%, afr) (gnomAD).

BLNK p.Pro87=

c.261C>T · VCV4748220

Likely benign Multiple submitters

Classification

Likely benign

ClinVar

Review

Multiple submitters ★★☆☆

ClinVar · 2 submitters

gnomAD v4.1

Rare

very rare (popmax 0.00267%, afr)

Conditions

agammaglobulinemia 4, 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 -9.5	GERP -3.4
Overall
CADD	0.809	PHRED · no single calibrated threshold — expert panels disagree

Population frequency

gnomAD v4.1 · exomes + genomes

Grpmax group 0.00267% African / African-American · 2/74,948 alleles

Filtering AF 0.00145% ClinGen BA1/BS1 input FAF95, joint · FAF99 0.00123%

Overall 0.0018% 29/1,614,048 alleles · very rare

Ancestry group	Frequency	1 in
African / African-Americangrpmax	0.00267%	37,474
East Asian	0.00223%	44,898
European (non-Finnish)	0.00212%	47,202
South Asian	0.0011%	91,088

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: BLNK
Protein: p.Pro87=
Coding: c.261C>T
MANE Select: NM_013314
Type: single nucleotide variant
Location: chr10:96227510 (GRCh38)
Gene constraint: LOEUF 0.517 · pLI 0.90 · ClinGen HI gene assoc. with recessive phenotype (gnomAD)
Structure: AlphaFold pLDDT 64.46 · 1 PDB
Residue 87: the 'disordered' region

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

Disease context

agammaglobulinemia 4, autosomal recessive — disease report on Sugi Atlas → Associated genes, phenotypes, clinical trials & treatments

Similar variants

BLNK c.902+2T>C Likely pathogenic ★★ same condition
BLNK p.Ala176Val Uncertain significance ★★ ⚠ same condition
BLNK p.Ala218Thr Uncertain significance ★★ ⚠ same condition
BLNK p.Ala290Val Uncertain significance ★★ ⚠ same condition
BLNK p.Ala88Ser Uncertain significance ★★ ⚠ same condition
BLNK p.Ala92Asp Uncertain significance ★★ ⚠ same condition
BLNK p.Ala92Thr Uncertain significance ★★ ⚠ same condition
BLNK p.Arg282Gln 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/blnk-p-pro87 (accessed [today's date]).

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