Is ABCB11 p.Pro77Ala (c.229C>G) pathogenic?

ABCB11 p.Pro77Ala (c.229C>G) is classified Uncertain significance in ABCB11 (ClinVar, Single submitter, 1 submitter; last evaluated 2026-04-14). AlphaMissense: ambiguous (0.3648); Absent from gnomAD v4.1; Associated with familial intrahepatic cholestasis.

What condition is associated with ABCB11 p.Pro77Ala (c.229C>G)?

ABCB11 p.Pro77Ala (c.229C>G) is associated with familial intrahepatic cholestasis (ClinVar).

How common is ABCB11 p.Pro77Ala (c.229C>G) in the general population?

ABCB11 p.Pro77Ala (c.229C>G) is absent from gnomAD v4.1 (gnomAD).

What do computational predictors say about ABCB11 p.Pro77Ala (c.229C>G)?

AlphaMissense predicts ambiguous (score 0.3648) — an in-silico prediction, not a clinical call.

ABCB11 p.Pro77Ala

c.229C>G · VCV4846117

Uncertain significance Single submitter

Classification

Uncertain significance

ClinVar

Review

Single submitter ★☆☆☆

ClinVar · 1 submitter

AlphaMissense

ambiguous

0.3648 · ACMG-weighted

gnomAD v4.1

Absent

absent from gnomAD v4.1

Missense predictors

2/2 damaging

REVEL, SaProt · AlphaMissense no call

Conditions

familial intrahepatic cholestasis

Computational evidence

Protein change
AlphaMissense	0.3648	ambiguous
REVEL	0.735	pathogenic-leaning
SaProt	LLR -10.23	damaging
⇒ REVEL and SaProt both call this damaging; AlphaMissense makes no call.
Splicing
SpliceAI	—	not assessed · no allele here is in the release
Constraint at this position
Conservation	phyloP 10	GERP 1.9, phastCons 1
Overall
CADD	24.9	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

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.Pro77Ala
Coding: c.229C>G
MANE Select: NM_003742
Type: single nucleotide variant
Location: chr2:169013432 (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 77: the abc transmembrane type-1 1 domain; an α-helix

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 p.Pro77Leu Uncertain significance ★ ⚠ same residue
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

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-pro77ala (accessed [today's date]).

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