Is ABCC8 p.Val141= (c.423G>A) pathogenic?

ABCC8 p.Val141= (c.423G>A) is classified Conflicting classifications of pathogenicity in ABCC8 (ClinVar, Conflicting submitters, 10 submitters; last evaluated 2026-02-04). Low-frequency (popmax 2.73%, afr); Associated with transient neonatal diabetes mellitus.

What condition is associated with ABCC8 p.Val141= (c.423G>A)?

ABCC8 p.Val141= (c.423G>A) is associated with transient neonatal diabetes mellitus, hyperinsulinemic hypoglycemia, familial, 1, diabetes mellitus, transient neonatal, 2 (ClinVar).

How common is ABCC8 p.Val141= (c.423G>A) in the general population?

ABCC8 p.Val141= (c.423G>A) is low-frequency (popmax 2.73%, afr) (gnomAD).

ABCC8 p.Val141=

c.423G>A · rs116132921 · VCV157702

Conflicting classifications of pathogenicity Conflicting submitters

Classification

Conflicting classifications of pathogenicity

ClinVar

Review

Conflicting submitters ★☆☆☆

ClinVar · 10 submitters

gnomAD v4.1

Rare

low-frequency (popmax 2.73%, afr)

Conditions

transient neonatal diabetes mellitus

Computational evidence

Protein change
Missense predictors do not apply to this variant type; conservation carries the signal.
Splicing
SpliceAI	—	not assessed · no allele here is in the release
Constraint at this position
Conservation	phyloP 1.9	GERP -4.9, phastCons 1
Overall
CADD	2.83	PHRED · no single calibrated threshold — expert panels disagree

Population frequency

gnomAD v4.1 · exomes + genomes

Grpmax group 2.73% African / African-American · 2,033/74,352 alleles

Filtering AF 2.64% ClinGen BA1/BS1 input FAF95, joint · FAF99 2.6%

Overall 0.308% 4,871/1,580,814 alleles · low-frequency

Ancestry group	Frequency	1 in
African / African-Americangrpmax	2.73%	37
Ashkenazi Jewishnot grpmax-eligible	2.05%	49
Middle Eastern	1.29%	77
Admixed American	0.775%	129
Remaining individualsnot grpmax-eligible	0.64%	156
South Asian	0.388%	258
European (non-Finnish)	0.0868%	1,153
Finnishnot grpmax-eligible	0.00647%	15,458
East Asian	0.0023%	43,396

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.Val141=
Coding: c.423G>A
MANE Select: NM_000352
dbSNP: rs116132921
Type: single nucleotide variant
Location: chr11:17463594 (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 141: an α-helix

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

Disease context

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

Also linked: hyperinsulinemic hypoglycemia, familial, 1 diabetes mellitus, transient neonatal, 2 maturity-onset diabetes of the young permanent neonatal diabetes mellitus

Similar variants

ABCC8 p.Val141Met Uncertain significance ★ ⚠ 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-val141 (accessed [today's date]).

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