Is LRBA p.Thr259= (c.777C>G) pathogenic?

LRBA p.Thr259= (c.777C>G) is classified Likely benign in LRBA (ClinVar, Single submitter, 1 submitter; last evaluated 2024-05-16). Very rare (popmax 0.0011%, sas); Associated with combined immunodeficiency due to LRBA deficiency.

What condition is associated with LRBA p.Thr259= (c.777C>G)?

LRBA p.Thr259= (c.777C>G) is associated with combined immunodeficiency due to LRBA deficiency (ClinVar).

How common is LRBA p.Thr259= (c.777C>G) in the general population?

LRBA p.Thr259= (c.777C>G) is very rare (popmax 0.0011%, sas) (gnomAD).

LRBA p.Thr259=

Q: How is Syndromic autoimmune enteropathy due to LRBA deficiency inherited?

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

c.777C>G · VCV3653631

Likely benign Single submitter

Classification

Likely benign

ClinVar

Review

Single submitter ★☆☆☆

ClinVar · 1 submitter

gnomAD v4.1

Rare

very rare (popmax 0.0011%, sas)

Conditions

combined immunodeficiency due to LRBA deficiency

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 1.4	GERP -1.4, phastCons 1
Overall
CADD	6.445	PHRED · no single calibrated threshold — expert panels disagree

Population frequency

gnomAD v4.1 · exomes + genomes

Grpmax group 0.0011% South Asian · 1/90,778 alleles

Overall 0.000124% 2/1,613,038 alleles · very rare exomes 2/1,460,816 · genomes 0/152,222 · joint denominator

Ancestry group	Frequency	1 in
South Asiangrpmax	0.0011%	90,778
European (non-Finnish)	8.48e-05%	1,179,704

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: LRBA
Protein: p.Thr259=
Coding: c.777C>G
MANE Select: NM_001364905
Type: single nucleotide variant
Location: chr4:150916518 (GRCh38)
Gene constraint: LOEUF 0.515 · pLI <0.01 (gnomAD)

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

Disease context

combined immunodeficiency due to LRBA deficiency — disease report on Sugi Atlas → Associated genes, phenotypes, clinical trials & treatments

For Syndromic autoimmune enteropathy due to LRBA deficiency (Orphanet):

Inheritance: Autosomal recessive
Onset: Childhood, Infancy

Similar variants

LRBA c.216+1G>C Pathogenic/Likely pathogenic ★★ same condition
LRBA c.2259-2A>G Likely pathogenic ★★ same condition
LRBA c.2767-2A>G Likely pathogenic ★★ same condition
LRBA c.4159-1G>T Likely pathogenic ★★ same condition
LRBA c.5518+2T>C Likely pathogenic ★★ same condition
LRBA c.5519-1G>A Likely pathogenic ★★ same condition
LRBA c.5646-2A>T Pathogenic ★★ same condition
LRBA p.Arg1445Ter 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/lrba-p-thr259 (accessed [today's date]).

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