Is ABCB11 p.Arg181Ile (c.542G>T) pathogenic?

ABCB11 p.Arg181Ile (c.542G>T) is classified Uncertain significance in ABCB11 (ClinVar, Single submitter, 1 submitter; last evaluated 2026-04-14). AlphaMissense: likely benign (0.2148); Absent from gnomAD v4.1; Associated with familial intrahepatic cholestasis.

What condition is associated with ABCB11 p.Arg181Ile (c.542G>T)?

ABCB11 p.Arg181Ile (c.542G>T) is associated with familial intrahepatic cholestasis (ClinVar).

How common is ABCB11 p.Arg181Ile (c.542G>T) in the general population?

ABCB11 p.Arg181Ile (c.542G>T) is absent from gnomAD v4.1 (gnomAD).

What do computational predictors say about ABCB11 p.Arg181Ile (c.542G>T)?

AlphaMissense predicts likely benign (score 0.2148) — an in-silico prediction, not a clinical call.

ABCB11 p.Arg181Ile

c.542G>T · VCV4846148

Uncertain significance Single submitter

Classification

Uncertain significance

ClinVar

Review

Single submitter ★☆☆☆

ClinVar · 1 submitter

AlphaMissense

likely benign

0.2148 · ACMG-weighted

gnomAD v4.1

Absent

absent from gnomAD v4.1

Missense predictors

0/2 damaging

AlphaMissense, SaProt · REVEL no call

Conditions

familial intrahepatic cholestasis

Computational evidence

Protein change
AlphaMissense	0.2148	likely benign
REVEL	0.379	indeterminate
SaProt	LLR -9.39	tolerated
⇒ AlphaMissense and SaProt both call this tolerated; REVEL makes no call.
Splicing
SpliceAI	—	not assessed · no allele here is in the release
Constraint at this position
Conservation	phyloP -1.1	GERP -3.9
Overall
CADD	14.72	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

Absent from gnomAD v4.1. Not observed in any sequenced alleles — a rarity signal (ACMG PM2-supporting), not evidence of pathogenicity on its own.

Variant & gene context

Gene: ABCB11
Protein: p.Arg181Ile
Coding: c.542G>T
MANE Select: NM_003742
Type: single nucleotide variant
Location: chr2:168995418 (GRCh38)
Gene constraint: LOEUF 0.739 · pLI <0.01 · ClinGen HI gene assoc. with recessive phenotype (gnomAD)
Structure: AlphaFold pLDDT 83.23 · 9 PDB
Residue 181: an α-helix; the abc transmembrane type-1 1 domain

Full ABCB11 gene report on Sugi Atlas → Gene function, pathways, protein structure, interactions & more

Disease context

familial intrahepatic cholestasis — disease report on Sugi Atlas → Associated genes, phenotypes, clinical trials & treatments

Similar variants

ABCB11 c.1084-2A>G Pathogenic ★★ same condition
ABCB11 c.1197+1G>T Pathogenic/Likely pathogenic ★★ same condition
ABCB11 c.1198-1G>C Pathogenic/Likely pathogenic ★★ same condition
ABCB11 c.1435-2A>T Pathogenic/Likely pathogenic ★★ same condition
ABCB11 c.150+3A>C Pathogenic/Likely pathogenic ★★ same condition
ABCB11 c.1638+1G>C Likely pathogenic ★★ same condition
ABCB11 c.2012-2A>G Pathogenic ★★ same condition
ABCB11 c.2012-8T>G 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/abcb11-p-arg181ile (accessed [today's date]).

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