Is CEL p.Ala289Val (c.866C>T) pathogenic?

CEL p.Ala289Val (c.866C>T) is classified Uncertain significance in CEL (ClinVar, Single submitter, 1 submitter; last evaluated 2024-04-01). Very rare (popmax 0.00134%, afr); Associated with maturity-onset diabetes of the young type 8.

What condition is associated with CEL p.Ala289Val (c.866C>T)?

CEL p.Ala289Val (c.866C>T) is associated with maturity-onset diabetes of the young type 8 (ClinVar).

How common is CEL p.Ala289Val (c.866C>T) in the general population?

CEL p.Ala289Val (c.866C>T) is very rare (popmax 0.00134%, afr) (gnomAD).

How is MODY inherited?

Typically Autosomal dominant, Not applicable (Orphanet). A genetic counselor can assess individual risk for a family.

CEL p.Ala289Val

c.866C>T · VCV3596555

Uncertain significance Single submitter

Classification

Uncertain significance

ClinVar

Review

Single submitter ★☆☆☆

ClinVar · 1 submitter

gnomAD v4.1

Rare

very rare (popmax 0.00134%, afr)

Conditions

maturity-onset diabetes of the young type 8

Computational evidence

Protein change
Missense predictors do not apply to this variant type; conservation carries the signal.
REVEL	0.54	indeterminate
Splicing
SpliceAI	—	not assessed · no allele here is in the release
Constraint at this position
Conservation	phyloP 5.9	GERP 1.4, phastCons 1
Regional constraint	o/e 0.87	unconstrained · MANE · 6,610 bp · p 0.015 · regional, not allelic
Overall
CADD	26.4	PHRED · no single calibrated threshold — expert panels disagree

Population frequency

gnomAD v4.1 · exomes + genomes

Grpmax group 0.00134% African / African-American · 1/74,866 alleles

Filtering AF 2.8e-05% ClinGen BA1/BS1 input FAF95, joint · FAF99 1.1e-05%

Overall 0.000186% 3/1,613,816 alleles · very rare

Ancestry group	Frequency	1 in
African / African-Americangrpmax	0.00134%	74,866
European (non-Finnish)	0.000169%	589,991

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: CEL
Protein: p.Ala289Val
Coding: c.866C>T
MANE Select: NM_001807
Type: single nucleotide variant
Location: chr9:133067176 (GRCh38)
Gene constraint: LOEUF 0.972 · pLI <0.01 (gnomAD)
Structure: AlphaFold pLDDT 84.10 · 7 PDB

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

Disease context

maturity-onset diabetes of the young type 8 — disease report on Sugi Atlas → Associated genes, phenotypes, clinical trials & treatments

For MODY (Orphanet):

Inheritance: Autosomal dominant, Not applicable
Onset: Adolescent, Adult, Childhood
Prevalence: 1-5 / 10 000 (Europe)

Similar variants

CEL p.Ala289Thr Likely benign ★ same residue
CEL c.67-3C>A Uncertain significance ★★ same condition
CEL p.Ala295Ser Uncertain significance ★★ same condition
CEL p.Ala548Glu Uncertain significance ★★ same condition
CEL p.Ala722Val Uncertain significance ★★ same condition
CEL p.Arg116Gln Uncertain significance ★★ same condition
CEL p.Arg185Trp Uncertain significance ★★ same condition
CEL p.Arg443Trp Uncertain significance ★★ 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/cel-p-ala289val (accessed [today's date]).

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