Is LRRC8A p.Lys271Arg (c.812A>G) pathogenic?

LRRC8A p.Lys271Arg (c.812A>G) is classified Uncertain significance in LRRC8A (ClinVar, Single submitter, 1 submitter; last evaluated 2025-12-22). AlphaMissense: ambiguous (0.4251); Very rare (popmax 8.47e-05%, nfe).

How common is LRRC8A p.Lys271Arg (c.812A>G) in the general population?

LRRC8A p.Lys271Arg (c.812A>G) is very rare (popmax 8.47e-05%, nfe) (gnomAD).

What do computational predictors say about LRRC8A p.Lys271Arg (c.812A>G)?

AlphaMissense predicts ambiguous (score 0.4251) — an in-silico prediction, not a clinical call.

LRRC8A p.Lys271Arg

c.812A>G · VCV4733942

Uncertain significance Single submitter

Classification

Uncertain significance

ClinVar

Review

Single submitter ★☆☆☆

ClinVar · 1 submitter

AlphaMissense

ambiguous

0.4251 · ACMG-weighted

gnomAD v4.1

Rare

very rare (popmax 8.47e-05%, nfe)

Computational evidence

Protein change
AlphaMissense	0.4251	ambiguous
REVEL	0.335	indeterminate
SaProt	LLR -5.23	tolerated
Splicing
SpliceAI	—	not assessed · no allele here is in the release
Constraint at this position
Conservation	phyloP 11	GERP 2, phastCons 1
Regional constraint	o/e 0.57	unconstrained · MANE · 1,645 bp · p 8.8e-32 · regional, not allelic
Overall
CADD	33.0	PHRED · no single calibrated threshold — expert panels disagree

AlphaMissense carries the ACMG weight for missense; REVEL and SaProt are independent agreement signals.

Population frequency

gnomAD v4.1 · exomes + genomes

Grpmax group 8.47e-05% European (non-Finnish) · 1/1,180,022 alleles

Overall 6.2e-05% 1/1,614,130 alleles · very rare exomes 1/1,461,858 · genomes 0/152,272 · 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: LRRC8A
Protein: p.Lys271Arg
Coding: c.812A>G
MANE Select: NM_019594
Type: single nucleotide variant
Location: chr9:128907976 (GRCh38)
Gene constraint: LOEUF 0.614 · pLI 0.06 (gnomAD)
Structure: AlphaFold pLDDT 85.52 · 13 PDB
Residue 271: an α-helix

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

Similar variants

LRRC8A p.Lys271= 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-lys271arg (accessed [today's date]).

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