Is CD27 p.His75Asn (c.223C>A) pathogenic?

CD27 p.His75Asn (c.223C>A) is classified Uncertain significance in CD27 (ClinVar, Single submitter, 1 submitter; last evaluated 2019-04-08). AlphaMissense: likely benign (0.2383); Ultra-rare (popmax 0.011%, sas); Associated with lymphoproliferative syndrome 2.

What condition is associated with CD27 p.His75Asn (c.223C>A)?

CD27 p.His75Asn (c.223C>A) is associated with lymphoproliferative syndrome 2 (ClinVar).

How common is CD27 p.His75Asn (c.223C>A) in the general population?

CD27 p.His75Asn (c.223C>A) is ultra-rare (popmax 0.011%, sas) (gnomAD).

What do computational predictors say about CD27 p.His75Asn (c.223C>A)?

AlphaMissense predicts likely benign (score 0.2383) — an in-silico prediction, not a clinical call.

CD27 p.His75Asn

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.223C>A · rs1199174513 · VCV863157

Uncertain significance Single submitter

Classification

Uncertain significance

ClinVar

Review

Single submitter ★☆☆☆

ClinVar · 1 submitter

AlphaMissense

likely benign

0.2383 · ACMG-weighted

gnomAD v4.1

Rare

ultra-rare (popmax 0.011%, sas)

Missense predictors

0/3 damaging

AlphaMissense, REVEL, SaProt

Conditions

lymphoproliferative syndrome 2

Computational evidence

Protein change
AlphaMissense	0.2383	likely benign
REVEL	0.11	moderately benign-leaning
SaProt	LLR -7.82	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 1.3	GERP -0.32, phastCons 1
Regional constraint	o/e 0.90	unconstrained · MANE · 6,293 bp · p 0.069 · regional, not allelic
Overall
CADD	16.76	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 0.011% South Asian · 10/91,086 alleles

Filtering AF 0.00594% ClinGen BA1/BS1 input FAF95, joint · FAF99 0.00453%

Overall 0.000684% 10/1,461,692 alleles · ultra-rare

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: CD27
Protein: p.His75Asn
Coding: c.223C>A
MANE Select: NM_001242
dbSNP: rs1199174513
Type: single nucleotide variant
Location: chr12:6445510 (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 75: 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.His75= Likely benign ★ 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-his75asn (accessed [today's date]).

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