Is CD27 p.Ala34Val (c.101C>T) pathogenic?

CD27 p.Ala34Val (c.101C>T) is classified Uncertain significance in CD27 (ClinVar, Single submitter, 1 submitter; last evaluated 2021-09-02). AlphaMissense: likely benign (0.1364); Absent from gnomAD v4.1; Associated with lymphoproliferative syndrome 2.

What condition is associated with CD27 p.Ala34Val (c.101C>T)?

CD27 p.Ala34Val (c.101C>T) is associated with lymphoproliferative syndrome 2 (ClinVar).

How common is CD27 p.Ala34Val (c.101C>T) in the general population?

CD27 p.Ala34Val (c.101C>T) is absent from gnomAD v4.1 (gnomAD).

What do computational predictors say about CD27 p.Ala34Val (c.101C>T)?

AlphaMissense predicts likely benign (score 0.1364) — an in-silico prediction, not a clinical call.

CD27 p.Ala34Val

Q: How is Combined immunodeficiency due to CD27 deficiency inherited?

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

c.101C>T · rs1366450468 · VCV1485375

Uncertain significance Single submitter

Classification

Uncertain significance

ClinVar

Review

Single submitter ★☆☆☆

ClinVar · 1 submitter

AlphaMissense

likely benign

0.1364 · ACMG-weighted

gnomAD v4.1

Absent

absent from gnomAD v4.1

Missense predictors

0/3 damaging

AlphaMissense, REVEL, SaProt

Conditions

lymphoproliferative syndrome 2

Computational evidence

Protein change
AlphaMissense	0.1364	likely benign
REVEL	0.104	moderately benign-leaning
SaProt	LLR -5.61	tolerated
⇒ AlphaMissense, REVEL and SaProt all call this tolerated.
Splicing
SpliceAI	—	not assessed · no allele here is in the release
Constraint at this position
Conservation	phyloP 2	GERP 0.43, phastCons 0.95
Regional constraint	o/e 0.90	unconstrained · MANE · 6,293 bp · p 0.069 · regional, not allelic
Overall
CADD	12.75	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

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: CD27
Protein: p.Ala34Val
Coding: c.101C>T
MANE Select: NM_001242
dbSNP: rs1366450468
Type: single nucleotide variant
Location: chr12:6445196 (GRCh38)
Gene constraint: LOEUF 0.946 · pLI <0.01 · ClinGen HI gene assoc. with recessive phenotype (gnomAD)
Structure: AlphaFold pLDDT 71.79 · 5 PDB
Residue 34: a disulfide bond; a β-strand

Full CD27 gene report on Sugi Atlas → Gene function, pathways, protein structure, interactions & more

Disease context

lymphoproliferative syndrome 2 — disease report on Sugi Atlas → Associated genes, phenotypes, clinical trials & treatments

For Combined immunodeficiency due to CD27 deficiency (Orphanet):

Inheritance: Autosomal recessive
Onset: Adolescent, Adult, Childhood, Infancy

Similar variants

CD27 p.Ala34Gly Uncertain significance ★ ⚠ same residue
CD27 p.Cys53Tyr Pathogenic ★★ same condition
CD27 p.Ala164Pro Uncertain significance ★★ ⚠ same condition
CD27 p.Ala229Thr Uncertain significance ★★ ⚠ same condition
CD27 p.Arg155Thr Uncertain significance ★★ ⚠ same condition
CD27 p.Arg172Gln Uncertain significance ★★ ⚠ same condition
CD27 p.Arg172Gly Uncertain significance ★★ ⚠ same condition
CD27 p.Arg182Ser 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/cd27-p-ala34val (accessed [today's date]).

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