Is ABCC8 p.Cys435Tyr (c.1304G>A) pathogenic?

ABCC8 p.Cys435Tyr (c.1304G>A) is classified Likely pathogenic in ABCC8 (ClinVar, Single submitter, 1 submitter; last evaluated 2025-09-10). AlphaMissense: likely pathogenic (0.7587); Absent from gnomAD v4.1; Associated with hyperinsulinemic hypoglycemia, familial, 1.

What condition is associated with ABCC8 p.Cys435Tyr (c.1304G>A)?

ABCC8 p.Cys435Tyr (c.1304G>A) is associated with hyperinsulinemic hypoglycemia, familial, 1 (ClinVar).

How common is ABCC8 p.Cys435Tyr (c.1304G>A) in the general population?

ABCC8 p.Cys435Tyr (c.1304G>A) is absent from gnomAD v4.1 (gnomAD).

What do computational predictors say about ABCC8 p.Cys435Tyr (c.1304G>A)?

AlphaMissense predicts likely pathogenic (score 0.7587) — an in-silico prediction, not a clinical call.

ABCC8 p.Cys435Tyr

c.1304G>A · VCV4277907

Likely pathogenic Single submitter

Classification

Likely pathogenic

ClinVar

Review

Single submitter ★☆☆☆

ClinVar · 1 submitter

AlphaMissense

likely pathogenic

0.7587 · ACMG-weighted

gnomAD v4.1

Absent

absent from gnomAD v4.1

Missense predictors

2/3 damaging

AlphaMissense, REVEL, SaProt

Conditions

hyperinsulinemic hypoglycemia, familial, 1

Computational evidence

Protein change
AlphaMissense	0.7587	likely pathogenic ✓ concordant with ClinVar
REVEL	0.919	moderately pathogenic-leaning
SaProt	LLR -5.98	tolerated
⇒ AlphaMissense and REVEL call this damaging; SaProt does not.
Splicing
SpliceAI	—	not assessed · no allele here is in the release
Constraint at this position
Conservation	phyloP 7.6	GERP 2.3, phastCons 1
Regional constraint	o/e 0.84	unconstrained · MANE · 84 kb · p 1.4e-12 · regional, not allelic
Overall
CADD	26.6	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.Cys435Tyr
Coding: c.1304G>A
MANE Select: NM_000352
Type: single nucleotide variant
Location: chr11:17448544 (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 435: an α-helix; the abc transmembrane type-1 1 domain; a UniProt-annotated variant site (in tndm2)

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

Similar variants

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
ABCC8 c.2041-21G>A 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-cys435tyr (accessed [today's date]).

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