Is ABCC8 p.Ser987Phe (c.2960C>T) pathogenic?

ABCC8 p.Ser987Phe (c.2960C>T) is classified Uncertain significance in ABCC8 (ClinVar, Multiple submitters, 2 submitters; last evaluated 2024-05-16). AlphaMissense: likely benign (0.1236); Very rare (popmax 0.004%, afr); Associated with diabetes mellitus, transient neonatal, 2.

What condition is associated with ABCC8 p.Ser987Phe (c.2960C>T)?

ABCC8 p.Ser987Phe (c.2960C>T) is associated with diabetes mellitus, transient neonatal, 2, type 2 diabetes mellitus, hypoglycemia, leucine-induced (ClinVar).

How common is ABCC8 p.Ser987Phe (c.2960C>T) in the general population?

ABCC8 p.Ser987Phe (c.2960C>T) is very rare (popmax 0.004%, afr) (gnomAD).

What do computational predictors say about ABCC8 p.Ser987Phe (c.2960C>T)?

AlphaMissense predicts likely benign (score 0.1236) — an in-silico prediction, not a clinical call.

ABCC8 p.Ser987Phe

c.2960C>T · rs750240747 · VCV1709187

Uncertain significance Multiple submitters

Classification

Uncertain significance

ClinVar

Review

Multiple submitters ★★☆☆

ClinVar · 2 submitters

AlphaMissense

likely benign

0.1236 · ACMG-weighted

gnomAD v4.1

Rare

very rare (popmax 0.004%, afr)

Missense predictors

0/2 damaging

AlphaMissense, SaProt · REVEL no call

Conditions

diabetes mellitus, transient neonatal, 2

Computational evidence

Protein change
AlphaMissense	0.1236	likely benign
REVEL	0.346	indeterminate
SaProt	LLR -8.31	tolerated
⇒ AlphaMissense and SaProt both call this tolerated; REVEL makes no call.
Splicing
SpliceAI	Δ0.21	acceptor gain · deltas
Constraint at this position
Conservation	phyloP 8.6	GERP 2.8, phastCons 1
Regional constraint	o/e 0.84	unconstrained · MANE · 84 kb · p 1.4e-12 · regional, not allelic
Overall
CADD	23.0	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

Grpmax group 0.004% African / African-American · 3/74,924 alleles

Filtering AF 0.00172% ClinGen BA1/BS1 input FAF95, joint · FAF99 0.00149%

Overall 0.00198% 32/1,613,640 alleles · very rare

Ancestry group	Frequency	1 in
African / African-Americangrpmax	0.004%	24,975
European (non-Finnish)	0.00246%	40,691

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: ABCC8
Protein: p.Ser987Phe
Coding: c.2960C>T
MANE Select: NM_000352
dbSNP: rs750240747
Type: single nucleotide variant
Location: chr11:17407090 (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 987: the 'disordered' region

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

Disease context

diabetes mellitus, transient neonatal, 2 — disease report on Sugi Atlas → Associated genes, phenotypes, clinical trials & treatments

Also linked: type 2 diabetes mellitus hypoglycemia, leucine-induced hyperinsulinemic hypoglycemia, familial, 1 diabetes mellitus, permanent neonatal 3

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+1G>C 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-ser987phe (accessed [today's date]).

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