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Comparative expression analysis of tnni1 paralogs during zebrafish embryonic development
Eunmi Kim1, Haeni Lee1, Hyun-Joung Lim1
1Division of Cardiovascular Disease Research, Department of Chronic Disease Convergence Research, National Institute of Health, Cheongju, Republic of Korea.
Gene Expression Patterns : GEP
|July 11, 2026
Summary
This study compares four zebrafish troponin I 1 (TNNI1) paralogs, revealing distinct expression patterns in cardiac and skeletal muscles during development. These differences suggest specialized functions after gene duplication.
Area of Science:
- Developmental Biology
- Molecular Biology
- Genetics
Background:
- Troponin I 1 (TNNI1) is crucial for slow-twitch skeletal muscle contraction.
- Vertebrate TNNI1 gene expression during development is not fully understood.
- Zebrafish possess four highly similar tnni1 paralogs (tnni1a, tnni1b, tnni1c, tnni1d).
Purpose of the Study:
- To systematically compare the spatial and temporal expression of zebrafish tnni1 paralogs during embryogenesis.
- To investigate potential functional divergence among tnni1 paralogs.
Main Methods:
- Multiple sequence alignment of encoded proteins.
- Whole-mount in situ hybridization to analyze gene expression patterns.
Main Results:
- Zebrafish Tnni1 paralogs show high conservation with mammalian TNNI1, with N-terminal divergence.
- tnni1a, tnni1b, tnni1c, and tnni1d exhibit distinct spatiotemporal expression in cardiac and skeletal muscles.
- tnni1b shows the strongest cardiac expression, while tnni1c and tnni1d are initially somite-expressed.
Conclusions:
- Zebrafish tnni1 paralogs display unique but overlapping expression profiles.
- These distinct patterns support subfunctionalization following gene duplication in muscle development.
