Is PTPRC p.Lys643= (c.1929G>A) pathogenic?

PTPRC p.Lys643= (c.1929G>A) is classified Likely benign in PTPRC (ClinVar, Single submitter, 1 submitter; last evaluated 2026-01-28). Ultra-rare (popmax 0.02%, amr); Associated with immunodeficiency 104.

What condition is associated with PTPRC p.Lys643= (c.1929G>A)?

PTPRC p.Lys643= (c.1929G>A) is associated with immunodeficiency 104 (ClinVar).

How common is PTPRC p.Lys643= (c.1929G>A) in the general population?

PTPRC p.Lys643= (c.1929G>A) is ultra-rare (popmax 0.02%, amr) (gnomAD).

PTPRC p.Lys643=

c.1929G>A · rs188500261 · VCV747304

Likely benign Single submitter

Classification

Likely benign

ClinVar

Review

Single submitter ★☆☆☆

ClinVar · 1 submitter

gnomAD v4.1

Rare

ultra-rare (popmax 0.02%, amr)

Conditions

immunodeficiency 104

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 2.8	GERP -2.3, phastCons 1
Overall
CADD	7.072	PHRED · no single calibrated threshold — expert panels disagree

Population frequency

gnomAD v4.1 · exomes + genomes

Grpmax group 0.02% Admixed American · 12/59,896 alleles

Filtering AF 0.0115% ClinGen BA1/BS1 input FAF95, joint · FAF99 0.009%

Overall 0.000931% 15/1,611,584 alleles · ultra-rare exomes 11/1,459,430 · genomes 4/152,154 · joint denominator

Ancestry group	Frequency	1 in
Admixed Americangrpmax	0.02%	4,991
Remaining individualsnot grpmax-eligible	0.00481%	20,795

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: PTPRC
Protein: p.Lys643=
Coding: c.1929G>A
MANE Select: NM_002838
dbSNP: rs188500261
Type: single nucleotide variant
Location: chr1:198731681 (GRCh38)
Gene constraint: LOEUF 0.343 · pLI 1.00 (gnomAD)
Structure: AlphaFold pLDDT 77.22 · 6 PDB
Residue 643: an α-helix; a UniProt-annotated variant site (in imd105)

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

Disease context

immunodeficiency 104 — disease report on Sugi Atlas → Associated genes, phenotypes, clinical trials & treatments

Similar variants

PTPRC p.Lys643Asn Uncertain significance ★ ⚠ same residue
PTPRC c.583+1G>A Likely pathogenic ★★ same condition
PTPRC c.583+1G>T Likely pathogenic ★★ same condition
PTPRC p.Arg890Ter Pathogenic/Likely pathogenic ★★ same condition
PTPRC c.1830-3C>T Uncertain significance ★★ same condition
PTPRC c.3509+5G>A Uncertain significance ★★ same condition
PTPRC p.Ala113Ser Uncertain significance ★★ ⚠ same condition
PTPRC p.Ala191Val 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/ptprc-p-lys643 (accessed [today's date]).

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