Is ABCC8 p.Ala464Val (c.1391C>T) pathogenic?

ABCC8 p.Ala464Val (c.1391C>T) is classified Uncertain significance in ABCC8 (ClinVar, Multiple submitters, 3 submitters; last evaluated 2024-08-27). AlphaMissense: likely pathogenic (0.7207); Absent from gnomAD v4.1; Associated with hyperinsulinemic hypoglycemia, familial, 1.

What condition is associated with ABCC8 p.Ala464Val (c.1391C>T)?

ABCC8 p.Ala464Val (c.1391C>T) is associated with hyperinsulinemic hypoglycemia, familial, 1, maturity-onset diabetes of the young, transient neonatal diabetes mellitus (ClinVar).

How common is ABCC8 p.Ala464Val (c.1391C>T) in the general population?

ABCC8 p.Ala464Val (c.1391C>T) is absent from gnomAD v4.1 (gnomAD).

What do computational predictors say about ABCC8 p.Ala464Val (c.1391C>T)?

AlphaMissense predicts likely pathogenic (score 0.7207) — an in-silico prediction, not a clinical call.

ABCC8 p.Ala464Val

c.1391C>T · rs1554933525 · VCV547893

Uncertain significance Multiple submitters

Classification

Uncertain significance

ClinVar

Review

Multiple submitters ★★☆☆

ClinVar · 3 submitters

AlphaMissense

likely pathogenic

0.7207 · ACMG-weighted

gnomAD v4.1

Absent

absent from gnomAD v4.1

Missense predictors

1/2 damaging

AlphaMissense, SaProt · REVEL no call

Conditions

hyperinsulinemic hypoglycemia, familial, 1

Computational evidence

Protein change
AlphaMissense	0.7207	likely pathogenic
REVEL	0.536	indeterminate
SaProt	LLR -5.23	tolerated
⇒ AlphaMissense calls this damaging; SaProt does not; REVEL makes no call.
Splicing
SpliceAI	—	not assessed · no allele here is in the release
Constraint at this position
Conservation	phyloP 12	GERP 2.5, phastCons 1
Regional constraint	o/e 0.84	unconstrained · MANE · 84 kb · p 1.4e-12 · regional, not allelic
Overall
CADD	28.9	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: ABCC8
Protein: p.Ala464Val
Coding: c.1391C>T
MANE Select: NM_000352
dbSNP: rs1554933525
Type: single nucleotide variant
Location: chr11:17443254 (GRCh38)
Gene constraint: LOEUF 0.829 · pLI <0.01 · ClinGen HI gene assoc. with recessive phenotype (gnomAD)
Structure: AlphaFold pLDDT 82.56 · 8 PDB
Residue 464: the abc transmembrane type-1 1 domain

Full ABCC8 gene report on Sugi Atlas → Gene function, pathways, protein structure, interactions & more

Disease context

hyperinsulinemic hypoglycemia, familial, 1 — disease report on Sugi Atlas → Associated genes, phenotypes, clinical trials & treatments

Also linked: maturity-onset diabetes of the young transient neonatal diabetes mellitus

Similar variants

ABCC8 p.Ala464= Likely benign ★ same residue
ABCC8 c.1176+2T>C Pathogenic/Likely pathogenic ★★ same condition
ABCC8 c.1333-1013A>G Pathogenic/Likely pathogenic ★★ same condition
ABCC8 c.148+1G>A Pathogenic/Likely pathogenic ★★ same condition
ABCC8 c.148+2T>G Likely pathogenic ★★ same condition
ABCC8 c.1630+1G>A Pathogenic/Likely pathogenic ★★ same condition
ABCC8 c.1630+1G>T Pathogenic ★★ same condition
ABCC8 c.1817+2T>C 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/abcc8-p-ala464val (accessed [today's date]).

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