Is RAG1 p.Ile266= (c.798C>T) pathogenic?

RAG1 p.Ile266= (c.798C>T) is classified Likely benign in RAG1 (ClinVar, Single submitter, 1 submitter; last evaluated 2025-12-15). Very rare (popmax 0.00133%, afr); Associated with combined immunodeficiency with skin granulomas.

What condition is associated with RAG1 p.Ile266= (c.798C>T)?

RAG1 p.Ile266= (c.798C>T) is associated with combined immunodeficiency with skin granulomas, severe combined immunodeficiency, autosomal recessive, T cell-negative, B cell-negative, NK cell-positive (ClinVar).

How common is RAG1 p.Ile266= (c.798C>T) in the general population?

RAG1 p.Ile266= (c.798C>T) is very rare (popmax 0.00133%, afr) (gnomAD).

How is Combined immunodeficiency with granulomatosis inherited?

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

RAG1 p.Ile266=

c.798C>T · rs141654332 · VCV2935129

Likely benign Single submitter

Classification

Likely benign

ClinVar

Review

Single submitter ★☆☆☆

ClinVar · 1 submitter

gnomAD v4.1

Rare

very rare (popmax 0.00133%, afr)

Conditions

combined immunodeficiency with skin granulomas

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 -6.1	GERP -4.2
Overall
CADD	0.352	PHRED · no single calibrated threshold — expert panels disagree

Population frequency

gnomAD v4.1 · exomes + genomes

Grpmax group 0.00133% African / African-American · 1/75,024 alleles

Filtering AF 0.0005% ClinGen BA1/BS1 input FAF95, joint · FAF99 0.000366%

Overall 0.000805% 13/1,614,156 alleles · very rare exomes 10/1,461,892 · genomes 3/152,264 · joint denominator

Ancestry group	Frequency	1 in
African / African-Americangrpmax	0.00133%	75,024
South Asian	0.0011%	91,084
European (non-Finnish)	0.000932%	107,276

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: RAG1
Protein: p.Ile266=
Coding: c.798C>T
MANE Select: NM_000448
dbSNP: rs141654332
Type: single nucleotide variant
Location: chr11:36574102 (GRCh38)
Gene constraint: LOEUF 0.703 · pLI <0.01 (gnomAD)
Structure: AlphaFold pLDDT 81.68
Residue 266: the 'interaction with importin alpha-1' region

Full RAG1 gene report on Sugi Atlas → Gene function, pathways, protein structure, interactions & more

Disease context

combined immunodeficiency with skin granulomas — disease report on Sugi Atlas → Associated genes, phenotypes, clinical trials & treatments

Also linked: severe combined immunodeficiency, autosomal recessive, T cell-negative, B cell-negative, NK cell-positive

For Combined immunodeficiency with granulomatosis (Orphanet):

Inheritance: Autosomal recessive

Similar variants

RAG1 p.Ala444Val Pathogenic ★★★ same condition
RAG1 p.Arg108Ter Pathogenic ★★★ same condition
RAG1 p.Arg142Ter Pathogenic ★★★ same condition
RAG1 p.Arg394Gln Likely pathogenic ★★★ same condition
RAG1 p.Arg394Trp Pathogenic ★★★ same condition
RAG1 p.Arg396His Pathogenic ★★★ same condition
RAG1 p.Arg404Gln Pathogenic ★★★ ⚠ same condition
RAG1 p.Arg561Cys 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/rag1-p-ile266 (accessed [today's date]).

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