Is TAP1 p.Asp297= (c.891T>C) pathogenic?

TAP1 p.Asp297= (c.891T>C) is classified Likely benign in TAP1 (ClinVar, Single submitter, 1 submitter; last evaluated 2025-04-17). Absent from gnomAD v4.1; Associated with MHC class I deficiency.

What condition is associated with TAP1 p.Asp297= (c.891T>C)?

TAP1 p.Asp297= (c.891T>C) is associated with MHC class I deficiency (ClinVar).

How common is TAP1 p.Asp297= (c.891T>C) in the general population?

TAP1 p.Asp297= (c.891T>C) is absent from gnomAD v4.1 (gnomAD).

TAP1 p.Asp297=

Q: How is Immunodeficiency by defective expression of MHC class I inherited?

Typically Autosomal recessive (Orphanet). A genetic counselor can assess individual risk for a family.

c.891T>C · VCV4717732

Likely benign Single submitter

Classification

Likely benign

ClinVar

Review

Single submitter ★☆☆☆

ClinVar · 1 submitter

gnomAD v4.1

Absent

absent from gnomAD v4.1

Conditions

MHC class I deficiency

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 -0.21	GERP -0.66, phastCons 0.22
Overall
CADD	1.764	PHRED · no single calibrated threshold — expert panels disagree

Population frequency

gnomAD v4.1 · exomes + genomes

Absent from gnomAD v4.1. Not observed in any sequenced alleles — a rarity signal (ACMG PM2-supporting), not evidence of pathogenicity on its own.

Variant & gene context

Gene: TAP1
Protein: p.Asp297=
Coding: c.891T>C
MANE Select: NM_000593
Type: single nucleotide variant
Location: chr6:32851103 (GRCh38)
Gene constraint: LOEUF 0.876 · pLI <0.01 (gnomAD)
Structure: AlphaFold pLDDT 79.03 · 22 PDB
Residue 297: the abc transmembrane type-1 domain; an α-helix

Full TAP1 gene report on Sugi Atlas → Gene function, pathways, protein structure, interactions & more

Disease context

MHC class I deficiency — disease report on Sugi Atlas → Associated genes, phenotypes, clinical trials & treatments

For Immunodeficiency by defective expression of MHC class I (Orphanet):

Inheritance: Autosomal recessive
Onset: Childhood

Similar variants

TAP1 p.Arg378Ter Pathogenic ★★ same condition
TAP1 p.Gln522Ter Pathogenic/Likely pathogenic ★★ same condition
TAP1 c.-20G>C Uncertain significance ★★ ⚠ same condition
TAP1 c.-59C>T Uncertain significance ★★ ⚠ same condition
TAP1 p.Ala101Val Uncertain significance ★★ ⚠ same condition
TAP1 p.Ala2Thr Uncertain significance ★★ ⚠ same condition
TAP1 p.Ala59Thr Uncertain significance ★★ ⚠ same condition
TAP1 p.Arg129Lys 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/tap1-p-asp297 (accessed [today's date]).

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