Is CD8A p.His208Leu (c.623A>T) pathogenic?

CD8A p.His208Leu (c.623A>T) is classified Uncertain significance in CD8A (ClinVar, Multiple submitters, 3 submitters; last evaluated 2022-07-20). AlphaMissense: likely benign (0.162); Ultra-rare (popmax 0.0484%, afr); Associated with susceptibility to respiratory infections associated with CD8alpha chain mutation.

How common is CD8A p.His208Leu (c.623A>T) in the general population?

CD8A p.His208Leu (c.623A>T) is ultra-rare (popmax 0.0484%, afr) (gnomAD).

What do computational predictors say about CD8A p.His208Leu (c.623A>T)?

AlphaMissense predicts likely benign (score 0.162) — an in-silico prediction, not a clinical call.

CD8A p.His208Leu

Q: What condition is associated with CD8A p.His208Leu (c.623A>T)?

CD8A p.His208Leu (c.623A>T) is associated with susceptibility to respiratory infections associated with CD8alpha chain mutation (ClinVar).

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.623A>T · rs146994832 · VCV625911

Uncertain significance Multiple submitters

Classification

Uncertain significance

ClinVar

Review

Multiple submitters ★★☆☆

ClinVar · 3 submitters

AlphaMissense

likely benign

0.162 · ACMG-weighted

gnomAD v4.1

Rare

ultra-rare (popmax 0.0484%, afr)

Missense predictors

0/2 damaging

AlphaMissense, SaProt · REVEL no call

Conditions

susceptibility to respiratory infections associated with CD8alpha chain mutation

Computational evidence

Protein change
AlphaMissense	0.162	likely benign
REVEL	0.387	indeterminate
SaProt	LLR -5.37	tolerated
⇒ AlphaMissense and SaProt both call this tolerated; REVEL makes no call.
Splicing
SpliceAI	—	not assessed · no allele here is in the release
Constraint at this position
Conservation	phyloP 0.073	GERP -3.1, phastCons 0.95
Regional constraint	o/e 1.13	unconstrained · MANE · 4,902 bp · p 0.024 · regional, not allelic
Overall
CADD	18.59	PHRED · no single calibrated threshold — expert panels disagree

ClinVar classifies this uncertain; the computational predictors unanimously lean tolerated — a triage signal, not a reclassification

AlphaMissense carries the ACMG weight for missense; REVEL and SaProt are independent agreement signals.

Population frequency

gnomAD v4.1 · exomes + genomes

Grpmax group 0.0484% African / African-American · 36/74,384 alleles

Filtering AF 0.0359% ClinGen BA1/BS1 input FAF95, joint · FAF99 0.0316%

Overall 0.0024% 38/1,584,158 alleles · ultra-rare

Ancestry group	Frequency	1 in
African / African-Americangrpmax	0.0484%	2,066
Remaining individualsnot grpmax-eligible	0.00325%	30,782

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.His208Leu
Coding: c.623A>T
MANE Select: NM_001768
dbSNP: rs146994832
Type: single nucleotide variant
Location: chr2:86789325 (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 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.Leu10Arg Uncertain significance ★★ ⚠ same condition
CD8A p.Pro130Arg Uncertain significance ★★ ⚠ same condition
CD8A p.Pro130Leu 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-his208leu (accessed [today's date]).

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