Is PTPRC p.Leu441= (c.1321C>T) pathogenic?

PTPRC p.Leu441= (c.1321C>T) is classified Likely benign in PTPRC (ClinVar, Multiple submitters, 2 submitters; last evaluated 2026-01-22). Ultra-rare (popmax 0.02%, amr); Associated with immunodeficiency 104.

What condition is associated with PTPRC p.Leu441= (c.1321C>T)?

PTPRC p.Leu441= (c.1321C>T) is associated with immunodeficiency 104 (ClinVar).

How common is PTPRC p.Leu441= (c.1321C>T) in the general population?

PTPRC p.Leu441= (c.1321C>T) is ultra-rare (popmax 0.02%, amr) (gnomAD).

PTPRC p.Leu441=

c.1321C>T · rs375608198 · VCV767372

Likely benign Multiple submitters

Classification

Likely benign

ClinVar

Review

Multiple submitters ★★☆☆

ClinVar · 2 submitters

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 -15	GERP -3.4
Overall
CADD	0.007	PHRED · no single calibrated threshold — expert panels disagree

Population frequency

gnomAD v4.1 · exomes + genomes

Grpmax group 0.02% Admixed American · 12/59,982 alleles

Filtering AF 0.0115% ClinGen BA1/BS1 input FAF95, joint · FAF99 0.00981%

Overall 0.00986% 159/1,611,972 alleles · ultra-rare exomes 143/1,459,836 · genomes 16/152,136 · joint denominator

Ancestry group	Frequency	1 in
Admixed Americangrpmax	0.02%	4,999
European (non-Finnish)	0.012%	8,308
Remaining individualsnot grpmax-eligible	0.00642%	15,579
African / African-American	0.00134%	74,840

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.Leu441=
Coding: c.1321C>T
MANE Select: NM_002838
dbSNP: rs375608198
Type: single nucleotide variant
Location: chr1:198716711 (GRCh38)
Gene constraint: LOEUF 0.343 · pLI 1.00 (gnomAD)
Structure: AlphaFold pLDDT 77.22 · 6 PDB
Residue 441: the fibronectin type-iii 1 domain

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.Leu441Met 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-leu441 (accessed [today's date]).

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