Arrhythmias & electrophysiology
MYL4 Identifies Intramural Anatomy of Purkinje Fibers in Human Hearts
Authors' conclusion
Such significant intramural prevalence exposes limitations associated with treatment approaches based on dogma that PF anatomy is restricted to the subendocardium. MYL4 here enabled a comprehensive visualization of human cardiac conduction system, offering an intricate bioanatomical map for heart rhythm management.
Study context
- Population
- Human hearts; validation in human, dog, goat and pig heartshuman hearts for transcriptomics · human (validation) n = 3 · dog n = 3 · goat n = 3 · pig n = 3
- Participants
- N = 10 hearts
- Exposure
- Purkinje fibers (PFs) vs ventricular myocardium and endocardium
- Outcome
- Genes up-regulated in PFs vs ventricular myocardium and endocardium
Methodological detailsRNA-sequencing and differential expression analysis
- RNA-sequencing and differential expression analysis
Main finding
As reported in the abstract
Genes up-regulated in PFs
99
Observational data: associations, not effects.
Further findings
MYL4 as human PF marker
- MYL4 identified as a promising human PF marker; specificity validated using canonical PF markers
Intramural MYL4-positive PFs
- Deep-seated network of transmurally intercalated, MYL4-positive PFs; share of human myocardial PF content
- over 60%
Original publication
MYL4 Identifies Intramural Anatomy of Purkinje Fibers in Human Hearts. JACC Clin Electrophysiol. Published 4 June 2025. doi:10.
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