Is CD27 p.Leu184= (c.552G>A) pathogenic?

CD27 p.Leu184= (c.552G>A) is classified Likely benign in CD27 (ClinVar, Multiple submitters, 2 submitters; last evaluated 2025-12-10). Ultra-rare (popmax 0.02%, eas); Associated with lymphoproliferative syndrome 2.

What condition is associated with CD27 p.Leu184= (c.552G>A)?

CD27 p.Leu184= (c.552G>A) is associated with lymphoproliferative syndrome 2 (ClinVar).

How common is CD27 p.Leu184= (c.552G>A) in the general population?

CD27 p.Leu184= (c.552G>A) is ultra-rare (popmax 0.02%, eas) (gnomAD).

CD27 p.Leu184=

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.552G>A · rs780709831 · VCV1089216

Likely benign Multiple submitters

Classification

Likely benign

ClinVar

Review

Multiple submitters ★★☆☆

ClinVar · 2 submitters

gnomAD v4.1

Rare

ultra-rare (popmax 0.02%, eas)

Conditions

lymphoproliferative syndrome 2

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 2.2	GERP -1.3, phastCons 0.99
Overall
CADD	8.097	PHRED · no single calibrated threshold — expert panels disagree

Population frequency

gnomAD v4.1 · exomes + genomes

Grpmax group 0.02% East Asian · 9/44,894 alleles

Filtering AF 0.0104% ClinGen BA1/BS1 input FAF95, joint · FAF99 0.00779%

Overall 0.00421% 68/1,613,994 alleles · ultra-rare

Ancestry group	Frequency	1 in
East Asiangrpmax	0.02%	4,988
Middle Eastern	0.0164%	6,084
South Asian	0.00988%	10,121
Admixed American	0.005%	19,999
Remaining individualsnot grpmax-eligible	0.0048%	20,829
European (non-Finnish)	0.00339%	29,501
Ashkenazi Jewishnot grpmax-eligible	0.00338%	29,600
African / African-American	0.00267%	37,448

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.Leu184=
Coding: c.552G>A
MANE Select: NM_001242
dbSNP: rs780709831
Type: single nucleotide variant
Location: chr12:6450908 (GRCh38)
Gene constraint: LOEUF 0.946 · pLI <0.01 · ClinGen HI gene assoc. with recessive phenotype (gnomAD)
Structure: AlphaFold pLDDT 71.79 · 5 PDB

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.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
CD27 p.Arg238Lys 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-leu184 (accessed [today's date]).

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