Is CEL p.Gly677Arg (c.2029G>A) pathogenic?

CEL p.Gly677Arg (c.2029G>A) is classified Uncertain significance in CEL (ClinVar, Single submitter, 1 submitter; last evaluated 2025-06-10). Very rare (popmax 0.00898%, afr); Associated with maturity-onset diabetes of the young type 8.

What condition is associated with CEL p.Gly677Arg (c.2029G>A)?

CEL p.Gly677Arg (c.2029G>A) is associated with maturity-onset diabetes of the young type 8 (ClinVar).

How common is CEL p.Gly677Arg (c.2029G>A) in the general population?

CEL p.Gly677Arg (c.2029G>A) is very rare (popmax 0.00898%, afr) (gnomAD).

How is MODY inherited?

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

CEL p.Gly677Arg

c.2029G>A · VCV4279797

Uncertain significance Single submitter

Classification

Uncertain significance

ClinVar

Review

Single submitter ★☆☆☆

ClinVar · 1 submitter

gnomAD v4.1

Rare

very rare (popmax 0.00898%, 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	0.094	moderately benign-leaning
Splicing
SpliceAI	—	not assessed · no allele here is in the release
Constraint at this position
Conservation	phyloP 0.54	GERP 0.033
Regional constraint	o/e 1.11	unconstrained · MANE · 642 bp · p 0.096 · regional, not allelic
Overall
CADD	15.43	PHRED · no single calibrated threshold — expert panels disagree

Population frequency

gnomAD v4.1 · exomes + genomes

Grpmax group 0.00898% African / African-American · 4/44,526 alleles

Filtering AF 0.00299% ClinGen BA1/BS1 input FAF95, joint · FAF99 0.00181%

Overall 0.000924% 8/865,876 alleles · very rare

Ancestry group	Frequency	1 in
African / African-Americangrpmax	0.00898%	11,131
Remaining individualsnot grpmax-eligible	0.00602%	16,611
East Asian	0.00407%	24,582
Admixed American	0.00342%	29,206

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.Gly677Arg
Coding: c.2029G>A
MANE Select: NM_001807
Type: single nucleotide variant
Location: chr9:133071531 (GRCh38)
Gene constraint: LOEUF 0.972 · pLI <0.01 (gnomAD)
Structure: AlphaFold pLDDT 84.10 · 7 PDB
Residue 677: the 'disordered' region; the '17 x 11 aa tandem repeats, glycodomain, o-linked (mucin type)' region

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.Gly677Trp Uncertain significance ★ same residue
CEL p.Gly677= 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

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-gly677arg (accessed [today's date]).

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