Chamber-specific transcriptomic insight into cardiac development using guinea pig and human heart tissue

Area of Science:

• Cardiovascular Research
• Developmental Biology
• Genomics

Background:

• Human heart development involves complex molecular and functional changes, but understanding these dynamics is limited.
• Pediatric cardiac research is hampered by a lack of suitable preclinical models.
• Guinea pigs share similarities with humans in ion channel expression and drug response, suggesting their potential as a cardiac model.

Purpose of the Study:

• To characterize transcriptional changes in guinea pig hearts during postnatal development (neonatal, juvenile, adult).
• To compare gene expression patterns between atrial and ventricular tissues during maturation.
• To identify conserved cardiac maturation markers between guinea pig and human atria.

Main Methods:

• Transcriptional profiling of neonatal, juvenile, and adult guinea pig hearts.
• Comparative analysis of gene expression in right atrial and left ventricular tissues.
• Cross-species transcriptome comparison between human and guinea pig atria.

Main Results:

• Neonatal guinea pig hearts showed overexpression of cell-cycle and energy metabolism genes, while adult hearts overexpressed calcium signaling genes.
• Atrial maturation was linked to sinoatrial node and conduction pathways, whereas ventricular maturation involved sarcomere organization and action potential regulation.
• Conserved maturation markers (S100A1, SLN, MYL4) were identified in guinea pig and human atria, indicating shared developmental programs.

Conclusions:

• The guinea pig serves as a valuable preclinical model for studying human heart maturation due to conserved gene expression patterns.
• This study provides a molecular framework for understanding age- and chamber-specific cardiac development.
• Findings support the development of age-specific therapies and computational models for pediatric cardiovascular conditions.