Adaptability and Evolution of Gobiidae: A Genetic Exploration

Area of Science:

• Evolutionary Biology
• Genomics
• Mitochondrial DNA Studies

Background:

• The Gobiidae family exhibits remarkable habitat diversity, linked to their adaptability in energy demands.
• Cellular energy generation via oxidative phosphorylation (OXPHOS) is crucial for this adaptability.

Purpose of the Study:

• To assemble and analyze complete mitochondrial genomes of three Gobiidae species.
• To investigate the evolutionary rates and selection pressures on Gobiidae mitogenomes across different environments.

Main Methods:

• Assembly of three complete mitochondrial genomes (Rhinogobius shennongensis, Rhinogobius wuyanlingensis, Chaenogobius annularis).
• Comparative mitochondrial DNA (mtDNA) genome analysis.
• Selection pressure analyses using the CmC model.

Main Results:

• Mitochondrial genomes contain 13 protein-coding genes (PCGs), 2 rRNAs, 22 tRNAs, and a control region (CR).
• All mtDNA PCGs showed ω ratios <1, indicating purifying selection.
• The adenosine triphosphate 8 (atp8) gene exhibited a faster evolutionary rate in Gobiidae.
• Positive selection was detected at specific sites in NADH dehydrogenase 6 (nd6) and atp8 genes.

Conclusions:

• Divergent evolutionary mechanisms in mtDNA PCGs contribute to Gobiidae's adaptation to varied environments.
• These findings offer insights into the adaptive evolution of Gobiidae mtDNA and OXPHOS molecular mechanisms.