Is CR2 p.Arg255= (c.765G>T) pathogenic?

CR2 p.Arg255= (c.765G>T) is classified Likely benign in CR2 (ClinVar, Single submitter, 1 submitter; last evaluated 2023-03-16). Very rare (popmax 0.00017%, nfe); Associated with immunodeficiency, common variable, 7.

What condition is associated with CR2 p.Arg255= (c.765G>T)?

CR2 p.Arg255= (c.765G>T) is associated with immunodeficiency, common variable, 7 (ClinVar).

How common is CR2 p.Arg255= (c.765G>T) in the general population?

CR2 p.Arg255= (c.765G>T) is very rare (popmax 0.00017%, nfe) (gnomAD).

CR2 p.Arg255=

Q: How is Common variable immunodeficiency phenotype due to CD21 deficiency inherited?

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

c.765G>T · rs1183204981 · VCV2791056

Likely benign Single submitter

Classification

Likely benign

ClinVar

Review

Single submitter ★☆☆☆

ClinVar · 1 submitter

gnomAD v4.1

Rare

very rare (popmax 0.00017%, nfe)

Conditions

immunodeficiency, common variable, 7

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 0.24	GERP -0.27, phastCons 0.003
Overall
CADD	6.512	PHRED · no single calibrated threshold — expert panels disagree

Population frequency

gnomAD v4.1 · exomes + genomes

Grpmax group 0.00017% European (non-Finnish) · 2/1,179,858 alleles

Filtering AF 2.8e-05% ClinGen BA1/BS1 input FAF95, joint · FAF99 1.1e-05%

Overall 0.000124% 2/1,613,824 alleles · very rare exomes 1/1,461,642 · genomes 1/152,182 · joint denominator

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: CR2
Protein: p.Arg255=
Coding: c.765G>T
MANE Select: NM_001006658
dbSNP: rs1183204981
Type: single nucleotide variant
Location: chr1:207469180 (GRCh38)
Gene constraint: LOEUF 0.871 · pLI <0.01 (gnomAD)
Structure: AlphaFold pLDDT 75.18 · 9 PDB
Residue 255: the sushi 4 domain

Full CR2 gene report on Sugi Atlas → Gene function, pathways, protein structure, interactions & more

Disease context

immunodeficiency, common variable, 7 — disease report on Sugi Atlas → Associated genes, phenotypes, clinical trials & treatments

For Common variable immunodeficiency phenotype due to CD21 deficiency (Orphanet):

Inheritance: Autosomal recessive

Similar variants

CR2 p.Arg255Trp Uncertain significance ★★ ⚠ same residue
CR2 p.Arg255Gln Uncertain significance ★ ⚠ same residue
CR2 c.1225+1G>C Pathogenic ★★ same condition
CR2 c.3089-1G>A Likely pathogenic ★★ same condition
CR2 p.Arg142Ter Pathogenic/Likely pathogenic ★★ same condition
CR2 p.Arg368Ter Pathogenic/Likely pathogenic ★★ same condition
CR2 p.Arg392Ter Pathogenic/Likely pathogenic ★★ same condition
CR2 p.Arg840Ter Pathogenic/Likely pathogenic ★★ 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/cr2-p-arg255 (accessed [today's date]).

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