DES (Desmin)
Details
DES encodes desmin, the muscle-specific type III intermediate filament protein that forms the extrasarcomeric cytoskeleton linking Z-discs to the sarcolemma, intercalated disc, and nuclear membrane. LP/P DES variants are unique among ACM genes in causing a wide spectrum of cardiomyopathy morphofunctional subtypes — DCM, RCM, and ACM (biventricular, left-dominant, and right-dominant forms) — often with associated proximal and/or distal skeletal myopathy. DES should be regarded as a highly arrhythmic gene with a high burden of advanced cardiac conduction disease.
Key Facts
- Cardiac penetrance: Up to 80% of individuals with LP/P DES variants develop a cardiac phenotype. (sources/ACM-Genotype-Mx-JCE-2024, rating: high)
- Phenotype spectrum: Clinically heterogeneous — biventricular, left-dominant, and right-dominant ACM have all been described, though DCM and RCM appear the predominant phenotypes. Certain variants are associated with distinct phenotypes. (sources/ACM-Genotype-Mx-JCE-2024)
- Conduction disease: High burden of advanced cardiac conduction disease, frequently necessitating CIED implantation. (sources/ACM-Genotype-Mx-JCE-2024)
- Skeletal myopathy: Often with proximal and/or distal involvement — distinguishes DES from most other ACM genes. (sources/ACM-Genotype-Mx-JCE-2024)
- Outcomes: VA, HF hospitalization, LVAD, and transplantation remain important outcomes with significant impact on survival. (sources/ACM-Genotype-Mx-JCE-2024)
- Prevalence: Unknown but considered rare. (sources/ACM-Genotype-Mx-JCE-2024)
Contradictions / Open Questions
- Natural history data remain limited — no genotype-specific risk stratification tools exist.
- The wide phenotypic spectrum (DCM → RCM → ACM) makes it unclear whether DES is best classified as an ACM gene or a broad cardiomyopathy gene with ACM as one manifestation.
- Optimal CIED selection (pacemaker vs ICD vs CRT) in DES cardiomyopathy is not established given the combined conduction disease + arrhythmia risk.
- Whether DES-specific exercise recommendations are needed is unknown.
Connections
- Related to entities/LMNA — similar combined conduction disease + cardiomyopathy phenotype
- Related to entities/FLNC — another non-desmosomal ACM gene
- Related to entities/TMEM43
- Related to entities/PLN
- Related to concepts/Arrhythmogenic-Cardiomyopathy
- Related to concepts/Conduction-System-Pacing
- Related to sources/ACM-Genotype-Mx-JCE-2024