Is DSP p.Ile640= (c.1920C>T) pathogenic?

DSP p.Ile640= (c.1920C>T) is classified Benign/Likely benign in DSP (ClinVar, Multiple submitters, 12 submitters; last evaluated 2026-02-02). Rare (popmax 0.504%, afr); Associated with Cardiovascular phenotype.

What condition is associated with DSP p.Ile640= (c.1920C>T)?

DSP p.Ile640= (c.1920C>T) is associated with Cardiovascular phenotype, cardiomyopathy, arrhythmogenic cardiomyopathy with wooly hair and keratoderma (ClinVar).

How common is DSP p.Ile640= (c.1920C>T) in the general population?

DSP p.Ile640= (c.1920C>T) is rare (popmax 0.504%, afr) (gnomAD).

DSP p.Ile640=

c.1920C>T · rs74806300 · VCV178027

Benign/Likely benign Multiple submitters

Classification

Benign/Likely benign

ClinVar

Review

Multiple submitters ★★☆☆

ClinVar · 12 submitters

gnomAD v4.1

Rare

rare (popmax 0.504%, afr)

Conditions

Cardiovascular phenotype

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 3.2	GERP -0.019, phastCons 1
Overall
CADD	9.453	PHRED · no single calibrated threshold — expert panels disagree

Population frequency

gnomAD v4.1 · exomes + genomes

Grpmax group 0.504% African / African-American · 378/75,032 alleles

Filtering AF 0.462% ClinGen BA1/BS1 input FAF95, joint · FAF99 0.445%

Overall 0.0261% 421/1,612,974 alleles · rare

Ancestry group	Frequency	1 in
African / African-Americangrpmax	0.504%	198
Admixed American	0.0367%	2,728
Remaining individualsnot grpmax-eligible	0.0272%	3,676
South Asian	0.0011%	91,074
European (non-Finnish)	0.000254%	393,337

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: DSP
Protein: p.Ile640=
Coding: c.1920C>T
MANE Select: NM_004415
dbSNP: rs74806300
Type: single nucleotide variant
Location: chr6:7571858 (GRCh38)
Gene constraint: LOEUF 0.443 · pLI 1.00 · ClinGen HI 3/3 (gnomAD)
Residue 640: a UniProt-annotated variant site (in arvd8; uncertain significance); the 'globular 1' region; the 'interaction with mapre1' region; a UniProt-annotated variant site (in dcwhkta; uncertain significance); a UniProt-annotated variant site (in arvd8; likely pathogenic; results in an unstable protein that forms perinuclear aggregates); a UniProt-annotated variant site (in arvd8 and dcwhkta; uncertain significance); a UniProt-annotated variant site (in arvd8)

Full DSP 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: cardiomyopathy arrhythmogenic cardiomyopathy with wooly hair and keratoderma arrhythmogenic right ventricular dysplasia 8

Similar variants

DSP p.Ile640Met Uncertain significance ★★ ⚠ same residue
DSP p.Ile640Thr Likely benign ★ same residue
DSP c.1141-2A>T Likely pathogenic ★★ same condition
DSP c.1266+2T>C Likely pathogenic ★★ same condition
DSP c.1574+1G>A Likely pathogenic ★★ same condition
DSP c.2130+1G>A Pathogenic/Likely pathogenic ★★ same condition
DSP c.2297+1G>A Likely pathogenic ★★ same condition
DSP c.2298-1G>C 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/dsp-p-ile640 (accessed [today's date]).

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