CD8A p.Ala149=

Q: Is CD8A p.Ala149= (c.447G>A) pathogenic?

CD8A p.Ala149= (c.447G>A) is classified Benign in CD8A (ClinVar, Multiple submitters, 3 submitters; last evaluated 2026-02-01). Common (popmax 9.05%, afr) — too common for a highly-penetrant pathogenic allele; Associated with susceptibility to respiratory infections associated with CD8alpha chain mutation.

Q: What condition is associated with CD8A p.Ala149= (c.447G>A)?

CD8A p.Ala149= (c.447G>A) is associated with susceptibility to respiratory infections associated with CD8alpha chain mutation (ClinVar).

Q: How common is CD8A p.Ala149= (c.447G>A) in the general population?

CD8A p.Ala149= (c.447G>A) is common (popmax 9.05%, afr) — too common for a highly-penetrant pathogenic allele (gnomAD).

Q: How is Susceptibility to respiratory infections associated with CD8alpha chain mutation inherited?

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

c.447G>A · rs115370220 · VCV464448

Benign Multiple submitters

Classification

Benign

ClinVar

Review

Multiple submitters ★★☆☆

ClinVar · 3 submitters

gnomAD v4.1

Common

common (popmax 9.05%, afr) — too common for a highly-penetrant pathogenic allele

Conditions

susceptibility to respiratory infections associated with CD8alpha chain mutation

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 -1.3	GERP -2.7
Overall
CADD	4.767	PHRED · no single calibrated threshold — expert panels disagree

Population frequency

gnomAD v4.1 · exomes + genomes

Grpmax group 9.05% African / African-American · 6,029/66,630 alleles

Filtering AF 8.86% ClinGen BA1/BS1 input FAF95, joint · FAF99 8.78%

Overall 0.479% 6,673/1,392,202 alleles · common

Ancestry group	Frequency	1 in
African / African-Americangrpmax	9.05%	11
Admixed American	0.784%	128
Remaining individualsnot grpmax-eligible	0.598%	167
Middle Eastern	0.37%	270
South Asian	0.0318%	3,145
European (non-Finnish)	0.00389%	25,727

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: CD8A
Protein: p.Ala149=
Coding: c.447G>A
MANE Select: NM_001768
dbSNP: rs115370220
Type: single nucleotide variant
Location: chr2:86789707 (GRCh38)
Gene constraint: LOEUF 1.496 · pLI <0.01 · ClinGen HI gene assoc. with recessive phenotype (gnomAD)
Structure: AlphaFold pLDDT 79.03 · 8 PDB

Full CD8A gene report on Sugi Atlas → Gene function, pathways, protein structure, interactions & more

Disease context

susceptibility to respiratory infections associated with CD8alpha chain mutation — disease report on Sugi Atlas → Associated genes, phenotypes, clinical trials & treatments

For Susceptibility to respiratory infections associated with CD8alpha chain mutation (Orphanet):

Inheritance: Autosomal recessive
Onset: Infancy, Neonatal
Prevalence: <1 / 1 000 000 (Europe)

Similar variants

CD8A p.Ala149Glu Uncertain significance ★ ⚠ same residue
CD8A p.Ala149Thr Uncertain significance ★ ⚠ same residue
CD8A c.403+4C>G Uncertain significance ★★ same condition
CD8A c.626-2A>T Uncertain significance ★★ same condition
CD8A p.Arg165Leu Uncertain significance ★★ ⚠ same condition
CD8A p.Arg165Pro Uncertain significance ★★ ⚠ same condition
CD8A p.His127Tyr Uncertain significance ★★ ⚠ same condition
CD8A p.His208Leu 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/cd8a-p-ala149 (accessed [today's date]).

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