Comparative selective pressure analysis on mitochondrial protein-coding genes in flying squirrels (Pteromyini) and tree squirrels (Sciurini)

Different animal groups with varying locomotion modes may have unique energy requirements. Mitochondria produce adenosine triphosphate (ATP) and reactive oxygen species via oxidative phosphorylation to support organisms energy requirements. The tribes Pteromyini (flying squirrels) and Sciurini (tree...

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Published inMitochondrial DNA. Part A. DNA mapping, sequencing, and analysis Vol. 35; no. 3-4; pp. 75 - 83
Main Authors Tu, Feiyun, Qiao, Yaqin, Zhao, Wenjing, Wu, Tong
Format Journal Article
LanguageEnglish
Published England 19.05.2025
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ISSN2470-1394
2470-1408
2470-1408
DOI10.1080/24701394.2024.2416179

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Abstract Different animal groups with varying locomotion modes may have unique energy requirements. Mitochondria produce adenosine triphosphate (ATP) and reactive oxygen species via oxidative phosphorylation to support organisms energy requirements. The tribes Pteromyini (flying squirrels) and Sciurini (tree squirrels), two closely related taxa within the family Sciuridae, exhibit distinct locomotion modes, energy requirements, and likely face different selective pressures on mitochondrial protein-coding genes (PCGs). We analysed 13 mitochondrial genome sequences from species belonging to the tribe Pteromyini and 117 from species belonging to the tribe Sciurini. Phylogenetic analysis revealed Pteromyini and Sciurini formed a sister relationship within the family Sciuridae. Among the 13 PCGs, exhibited the highest dN/dS values, while showed the lowest. The background selection ratio (ω ) values for six genes ( , , , , , and ) in Pteromyini were lower than the foreground selection ratio (ω ) values observed in Sciurini. A RELAX analysis revealed that , , , and genes experienced intensified in selection strength. BUSTED analysis identified stronger signatures of diversifying selection in and , highlighting amino acid changes. MEME identified episodic diversifying selection at specific sites among eight PCGs. These findings revealed distinct selective pressures on PCGs in flying and tree squirrels.
AbstractList Different animal groups with varying locomotion modes may have unique energy requirements. Mitochondria produce adenosine triphosphate (ATP) and reactive oxygen species via oxidative phosphorylation to support organisms energy requirements. The tribes Pteromyini (flying squirrels) and Sciurini (tree squirrels), two closely related taxa within the family Sciuridae, exhibit distinct locomotion modes, energy requirements, and likely face different selective pressures on mitochondrial protein-coding genes (PCGs). We analysed 13 mitochondrial genome sequences from species belonging to the tribe Pteromyini and 117 from species belonging to the tribe Sciurini. Phylogenetic analysis revealed Pteromyini and Sciurini formed a sister relationship within the family Sciuridae. Among the 13 PCGs, exhibited the highest dN/dS values, while showed the lowest. The background selection ratio (ω ) values for six genes ( , , , , , and ) in Pteromyini were lower than the foreground selection ratio (ω ) values observed in Sciurini. A RELAX analysis revealed that , , , and genes experienced intensified in selection strength. BUSTED analysis identified stronger signatures of diversifying selection in and , highlighting amino acid changes. MEME identified episodic diversifying selection at specific sites among eight PCGs. These findings revealed distinct selective pressures on PCGs in flying and tree squirrels.
Different animal groups with varying locomotion modes may have unique energy requirements. Mitochondria produce adenosine triphosphate (ATP) and reactive oxygen species via oxidative phosphorylation to support organisms energy requirements. The tribes Pteromyini (flying squirrels) and Sciurini (tree squirrels), two closely related taxa within the family Sciuridae, exhibit distinct locomotion modes, energy requirements, and likely face different selective pressures on mitochondrial protein-coding genes (PCGs). We analysed 13 mitochondrial genome sequences from species belonging to the tribe Pteromyini and 117 from species belonging to the tribe Sciurini. Phylogenetic analysis revealed Pteromyini and Sciurini formed a sister relationship within the family Sciuridae. Among the 13 PCGs, ATP8 exhibited the highest dN/dS values, while COX1 showed the lowest. The background selection ratio (ω2) values for six genes (ND1, ND2, ND4, ATP6, ND5, and COX3) in Pteromyini were lower than the foreground selection ratio (ω0) values observed in Sciurini. A RELAX analysis revealed that CYTB, ND4, ATP6, and COX3 genes experienced intensified in selection strength. BUSTED analysis identified stronger signatures of diversifying selection in CYTB and ATP6, highlighting amino acid changes. MEME identified episodic diversifying selection at specific sites among eight PCGs. These findings revealed distinct selective pressures on PCGs in flying and tree squirrels.Different animal groups with varying locomotion modes may have unique energy requirements. Mitochondria produce adenosine triphosphate (ATP) and reactive oxygen species via oxidative phosphorylation to support organisms energy requirements. The tribes Pteromyini (flying squirrels) and Sciurini (tree squirrels), two closely related taxa within the family Sciuridae, exhibit distinct locomotion modes, energy requirements, and likely face different selective pressures on mitochondrial protein-coding genes (PCGs). We analysed 13 mitochondrial genome sequences from species belonging to the tribe Pteromyini and 117 from species belonging to the tribe Sciurini. Phylogenetic analysis revealed Pteromyini and Sciurini formed a sister relationship within the family Sciuridae. Among the 13 PCGs, ATP8 exhibited the highest dN/dS values, while COX1 showed the lowest. The background selection ratio (ω2) values for six genes (ND1, ND2, ND4, ATP6, ND5, and COX3) in Pteromyini were lower than the foreground selection ratio (ω0) values observed in Sciurini. A RELAX analysis revealed that CYTB, ND4, ATP6, and COX3 genes experienced intensified in selection strength. BUSTED analysis identified stronger signatures of diversifying selection in CYTB and ATP6, highlighting amino acid changes. MEME identified episodic diversifying selection at specific sites among eight PCGs. These findings revealed distinct selective pressures on PCGs in flying and tree squirrels.
Author Qiao, Yaqin
Wu, Tong
Tu, Feiyun
Zhao, Wenjing
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Snippet Different animal groups with varying locomotion modes may have unique energy requirements. Mitochondria produce adenosine triphosphate (ATP) and reactive...
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SubjectTerms Animals
Genes, Mitochondrial
Genome, Mitochondrial
Mitochondrial Proteins - genetics
Phylogeny
Sciuridae - classification
Sciuridae - genetics
Selection, Genetic
Title Comparative selective pressure analysis on mitochondrial protein-coding genes in flying squirrels (Pteromyini) and tree squirrels (Sciurini)
URI https://www.ncbi.nlm.nih.gov/pubmed/39417543
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