Is ABCC8 p.Phe1398= (c.4194C>T) pathogenic?

ABCC8 p.Phe1398= (c.4194C>T) is classified Conflicting classifications of pathogenicity in ABCC8 (ClinVar, Conflicting submitters, 2 submitters; last evaluated 2026-01-06). Ultra-rare (popmax 0.0298%, eas); Associated with transient neonatal diabetes mellitus.

What condition is associated with ABCC8 p.Phe1398= (c.4194C>T)?

ABCC8 p.Phe1398= (c.4194C>T) is associated with transient neonatal diabetes mellitus, maturity-onset diabetes of the young (ClinVar).

How common is ABCC8 p.Phe1398= (c.4194C>T) in the general population?

ABCC8 p.Phe1398= (c.4194C>T) is ultra-rare (popmax 0.0298%, eas) (gnomAD).

ABCC8 p.Phe1398=

c.4194C>T · rs746249607 · VCV794422

Conflicting classifications of pathogenicity Conflicting submitters

Classification

Conflicting classifications of pathogenicity

ClinVar

Review

Conflicting submitters ★☆☆☆

ClinVar · 2 submitters

gnomAD v4.1

Rare

ultra-rare (popmax 0.0298%, eas)

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 -3.6	GERP -4.8
Overall
CADD	7.715	PHRED · no single calibrated threshold — expert panels disagree

Population frequency

gnomAD v4.1 · exomes + genomes

Grpmax group 0.0298% East Asian · 13/43,608 alleles

Filtering AF 0.0176% ClinGen BA1/BS1 input FAF95, joint · FAF99 0.0139%

Overall 0.00133% 21/1,580,256 alleles · ultra-rare exomes 18/1,427,952 · genomes 3/152,304 · joint denominator

Ancestry group	Frequency	1 in
East Asiangrpmax	0.0298%	3,354
South Asian	0.00812%	12,316
European (non-Finnish)	8.61e-05%	1,161,989

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.Phe1398=
Coding: c.4194C>T
MANE Select: NM_000352
dbSNP: rs746249607
Type: single nucleotide variant
Location: chr11:17395856 (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 1398: the abc transporter 2 domain

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: maturity-onset diabetes of the young

Similar variants

ABCC8 c.2116+2T>C Pathogenic/Likely pathogenic ★★ same condition
ABCC8 c.3868-1G>A Pathogenic/Likely pathogenic ★★ same condition
ABCC8 c.3989-9G>A Pathogenic ★★ same condition
ABCC8 c.4308-2A>G Pathogenic/Likely pathogenic ★★ same condition
ABCC8 p.Arg1379His Pathogenic/Likely pathogenic ★★ same condition
ABCC8 p.Arg1538Gln Pathogenic/Likely pathogenic ★★ ⚠ same condition
ABCC8 p.Gly228Asp Pathogenic/Likely pathogenic ★★ same condition
ABCC8 p.Gly716Ser 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-phe1398 (accessed [today's date]).

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