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An Evolutionarily Conserved Regulatory Pathway of Muscle Mitochondrial Network Organization

Authors :
Prasanna Katti
Angel Aponte
Ajayi Pt
Bleck Cke
Brian Glancy
Publication Year :
2021
Publisher :
Cold Spring Harbor Laboratory, 2021.

Abstract

Mitochondrial networks provide coordinated energy distribution throughout muscle cells. However, pathways specifying mitochondrial network-type separately from contractile fiber-type remain unclear. Here, we show that natural energetic demands placed on Drosophila melanogaster muscles yield native cell-types among which contractile and mitochondrial network-types are regulated independently. Proteomic analyses of indirect flight, jump, and leg muscles together with muscles misexpressing known fiber-type specification factor salm identified transcription factors H15 and cut as potential mitochondrial network regulators. We demonstrate H15 operates downstream of salm regulating flight muscle contractile and mitochondrial network-type. Conversely, H15 regulates mitochondrial network configuration but not contractile type in jump and leg muscles. Further, we find that cut regulates salm expression in flight muscles and mitochondrial network configuration in leg muscles. These data indicate cell type-specific regulation of muscle mitochondrial network organization separately from contractile type, mitochondrial content, and mitochondrial size through an evolutionarily conserved pathway involving cut, salm, and H15.

Details

Database :
OpenAIRE
Accession number :
edsair.doi...........da2adf9c38d4128dcbdc90fac1673aa7
Full Text :
https://doi.org/10.1101/2021.09.30.462204