Is DES p.Ser266Pro (c.796T>C) pathogenic?

DES p.Ser266Pro (c.796T>C) is classified Uncertain significance in DES (ClinVar, Multiple submitters, 3 submitters; last evaluated 2025-04-23). AlphaMissense: ambiguous (0.4568); Very rare (popmax 8.47e-05%, nfe); Associated with Cardiovascular phenotype.

What condition is associated with DES p.Ser266Pro (c.796T>C)?

DES p.Ser266Pro (c.796T>C) is associated with Cardiovascular phenotype, myofibrillar myopathy 1 (ClinVar).

How common is DES p.Ser266Pro (c.796T>C) in the general population?

DES p.Ser266Pro (c.796T>C) is very rare (popmax 8.47e-05%, nfe) (gnomAD).

What do computational predictors say about DES p.Ser266Pro (c.796T>C)?

AlphaMissense predicts ambiguous (score 0.4568) — an in-silico prediction, not a clinical call.

DES p.Ser266Pro

c.796T>C · rs1342331264 · VCV1020097

Uncertain significance Multiple submitters

Classification

Uncertain significance

ClinVar

Review

Multiple submitters ★★☆☆

ClinVar · 3 submitters

AlphaMissense

ambiguous

0.4568 · ACMG-weighted

gnomAD v4.1

Rare

very rare (popmax 8.47e-05%, nfe)

Missense predictors

2/2 damaging

REVEL, SaProt · AlphaMissense indeterminate

Conditions

Cardiovascular phenotype

Computational evidence

Protein change
AlphaMissense	0.4568	ambiguous
REVEL	0.857	moderately pathogenic-leaning
SaProt	LLR -11.47	damaging
⇒ REVEL and SaProt both call this damaging; AlphaMissense is indeterminate.
Splicing
SpliceAI	—	not assessed · no allele here is in the release
Constraint at this position
Conservation	phyloP 4.5	GERP -0.44, phastCons 1
Regional constraint	o/e 0.92	unconstrained · MANE · 7,524 bp · p 0.05 · regional, not allelic
Overall
CADD	27.7	PHRED · no single calibrated threshold — expert panels disagree

AlphaMissense carries the ACMG weight for missense; REVEL and SaProt are independent agreement signals.

Population frequency

gnomAD v4.1 · exomes + genomes

Grpmax group 8.47e-05% European (non-Finnish) · 1/1,179,980 alleles

Overall 6.2e-05% 1/1,613,852 alleles · very rare exomes 1/1,461,756 · genomes 0/152,096 · joint denominator

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: DES
Protein: p.Ser266Pro
Coding: c.796T>C
MANE Select: NM_001927
dbSNP: rs1342331264
Type: single nucleotide variant
Location: chr2:219420555 (GRCh38)
Gene constraint: LOEUF 0.81 · pLI <0.01 (gnomAD)
Structure: AlphaFold pLDDT 77.73
Residue 266: the if rod domain; the 'linker 12' region

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

Disease context

Cardiovascular phenotype — disease report on Sugi Atlas → Associated genes, phenotypes, clinical trials & treatments

Also linked: myofibrillar myopathy 1

Similar variants

DES p.Ser266Phe Uncertain significance ★★ ⚠ same residue
DES c.1289-2A>G Pathogenic/Likely pathogenic ★★ same condition
DES c.579-2A>C Likely pathogenic ★★ same condition
DES c.735+1G>A Pathogenic/Likely pathogenic ★★ same condition
DES c.735+1G>C Pathogenic/Likely pathogenic ★★ same condition
DES c.735+3A>G Pathogenic ★★ same condition
DES p.Ala120Pro Pathogenic/Likely pathogenic ★★ same condition
DES p.Ala285Val 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/des-p-ser266pro (accessed [today's date]).

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