Is LRRC8A p.Pro77Leu (c.230C>T) pathogenic?

LRRC8A p.Pro77Leu (c.230C>T) is classified Uncertain significance in LRRC8A (ClinVar, Single submitter, 1 submitter; last evaluated 2025-10-17). AlphaMissense: likely benign (0.0637); Very rare (popmax 0.00891%, eas).

How common is LRRC8A p.Pro77Leu (c.230C>T) in the general population?

LRRC8A p.Pro77Leu (c.230C>T) is very rare (popmax 0.00891%, eas) (gnomAD).

What do computational predictors say about LRRC8A p.Pro77Leu (c.230C>T)?

AlphaMissense predicts likely benign (score 0.0637) — an in-silico prediction, not a clinical call.

LRRC8A p.Pro77Leu

c.230C>T · rs201084502 · VCV1917775

Uncertain significance Single submitter

Classification

Uncertain significance

ClinVar

Review

Single submitter ★☆☆☆

ClinVar · 1 submitter

AlphaMissense

likely benign

0.0637 · ACMG-weighted

gnomAD v4.1

Rare

very rare (popmax 0.00891%, eas)

Missense predictors

0/3 damaging

AlphaMissense, REVEL, SaProt

Computational evidence

Protein change
AlphaMissense	0.0637	likely benign
REVEL	0.087	moderately benign-leaning
SaProt	LLR -6.34	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 0.37	GERP -1.6, phastCons 0.001
Regional constraint	o/e 1.09	unconstrained · MANE · 106 bp · p 0.55 · regional, not allelic
Overall
CADD	8.42	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 0.00891% East Asian · 4/44,886 alleles

Filtering AF 0.00347% ClinGen BA1/BS1 input FAF95, joint · FAF99 0.00229%

Overall 0.00161% 26/1,613,244 alleles · very rare exomes 20/1,461,088 · genomes 6/152,156 · joint denominator

Ancestry group	Frequency	1 in
East Asiangrpmax	0.00891%	11,222
African / African-American	0.00801%	12,484
South Asian	0.00329%	30,362
European (non-Finnish)	0.0011%	90,770

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: LRRC8A
Protein: p.Pro77Leu
Coding: c.230C>T
MANE Select: NM_019594
dbSNP: rs201084502
Type: single nucleotide variant
Location: chr9:128907394 (GRCh38)
Gene constraint: LOEUF 0.614 · pLI 0.06 (gnomAD)
Structure: AlphaFold pLDDT 85.52 · 13 PDB

Full LRRC8A gene report on Sugi Atlas → Gene function, pathways, protein structure, interactions & more

Similar variants

LRRC8A p.Pro77= Likely benign ★ same residue
LRRC8A p.Ala497Val Uncertain significance ★★ ⚠ same type
LRRC8A p.Arg148His Uncertain significance ★★ ⚠ same type
LRRC8A p.Arg214Gln Uncertain significance ★★ ⚠ same type
LRRC8A p.Arg218Gln Uncertain significance ★★ ⚠ same type
LRRC8A p.Arg218Trp Uncertain significance ★★ ⚠ same type
LRRC8A p.Arg262Cys Uncertain significance ★★ ⚠ same type
LRRC8A p.Arg496Gln Uncertain significance ★★ ⚠ same type

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/lrrc8a-p-pro77leu (accessed [today's date]).

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