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Updated: Jun 3, 2025
08:22
Tissue-specific miRNA Expression Profiling in Mouse Heart Sections Using In Situ Hybridization
Published on: September 15, 2018
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X-Chromosome-Linked miRNAs Regulate Sex Differences in Cardiac Physiology
James I Emerson1, Wei Shi2,3, Jose Paredes-Larios2
1Department of Biochemistry & Biophysics (J.I.E., W.F.M.), University of North Carolina, Chapel Hill.
Circulation Research
|January 8, 2025
Summary
Sex-specific microRNAs (miRNAs) influence heart function. A specific miRNA, miR-871, affects calcium signaling and electrophysiology in female hearts, impacting cardiac disease risk.
Area of Science:
- Cardiovascular Biology
- Molecular Biology
- Genetics
Background:
- Males and females possess distinct cardiac anatomy and function.
- These differences predispose sexes to specific heart conditions.
Purpose of the Study:
- To identify microRNAs (miRNAs) with sex-differential expression in mouse hearts.
- To elucidate the role of these miRNAs in sex-specific cardiac physiology and disease.
Main Methods:
- Identified sex-differential miRNAs in mouse hearts.
- Investigated the function of miR-871 and its target, SRL, in cardiac electrophysiology.
- Utilized antagomirs to inhibit miR-871 in female mice.
Main Results:
- Four conserved miRNAs, including miR-871, are X-chromosome-linked and expressed higher in females.
- miR-871 reduces SRL expression, impacting female cardiac calcium signaling and electrophysiology.
- miR-871 inhibition in females shortened ventricular repolarization, mimicking male cardiac traits.
- Human miR-888 (orthologue of miR-871) coevolved with and regulates human SRL.
Conclusions:
- Sex-differential miRNA mechanisms are crucial for sex-specific cardiac functions.
- These findings highlight the potential relevance of miRNAs in human cardiac diseases.
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