Is CEL p.Arg284Ter (c.850C>T) pathogenic?

CEL p.Arg284Ter (c.850C>T) is classified Uncertain significance in CEL (ClinVar, Single submitter, 2 submitters; last evaluated 2024-04-10). Ultra-rare (popmax 0.0164%, mid); Associated with maturity-onset diabetes of the young type 8.

What condition is associated with CEL p.Arg284Ter (c.850C>T)?

CEL p.Arg284Ter (c.850C>T) is associated with maturity-onset diabetes of the young type 8 (ClinVar).

How common is CEL p.Arg284Ter (c.850C>T) in the general population?

CEL p.Arg284Ter (c.850C>T) is ultra-rare (popmax 0.0164%, mid) (gnomAD).

How is MODY inherited?

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

CEL p.Arg284Ter

c.850C>T · VCV3352004

Uncertain significance Single submitter

Classification

Uncertain significance

ClinVar

Review

Single submitter ★☆☆☆

ClinVar · 2 submitters

Consequence

nonsense (stop-gain)

predicted LoF

gnomAD v4.1

Rare

ultra-rare (popmax 0.0164%, mid)

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.
Consequence	nonsense (stop-gain)	predicted loss-of-function
NMD	predicted	premature termination codon in exon 7 of 11
Splicing
SpliceAI	—	not assessed · no allele here is in the release
Constraint at this position
Conservation	phyloP 1.7	GERP -0.91, phastCons 0.007
Overall
CADD	36.0	PHRED · no single calibrated threshold — expert panels disagree

Predicted loss-of-function is descriptive, not an applied PVS1 code.

Population frequency

gnomAD v4.1 · exomes + genomes

Grpmax group 0.0164% Middle Eastern · 1/6,080 alleles

Filtering AF 0.00528% ClinGen BA1/BS1 input FAF95, joint · FAF99 0.00381%

Overall 0.00353% 57/1,613,834 alleles · ultra-rare

Ancestry group	Frequency	1 in
Middle Easterngrpmax	0.0164%	6,080
African / African-American	0.0107%	9,362
East Asian	0.00891%	11,222
European (non-Finnish)	0.00339%	29,499
Remaining individualsnot grpmax-eligible	0.0032%	31,238
Finnishnot grpmax-eligible	0.00156%	63,984
South Asian	0.0011%	91,038

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.Arg284Ter
Coding: c.850C>T
MANE Select: NM_001807
Type: single nucleotide variant
Location: chr9:133067160 (GRCh38)
Gene constraint: LOEUF 0.972 · pLI <0.01 (gnomAD)
Structure: AlphaFold pLDDT 84.10 · 7 PDB
Residue 284: an α-helix

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.Arg284Gly Conflicting classifications of pathogenicity ★ same residue
CEL p.Arg284Pro Uncertain significance ★ 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-arg284ter (accessed [today's date]).

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