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 in | Mitochondrial DNA. Part A. DNA mapping, sequencing, and analysis Vol. 35; no. 3-4; pp. 75 - 83 |
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Main Authors | , , , |
Format | Journal Article |
Language | English |
Published |
England
19.05.2025
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Online Access | Get full text |
ISSN | 2470-1394 2470-1408 2470-1408 |
DOI | 10.1080/24701394.2024.2416179 |
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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. |
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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 |
Author_xml | – sequence: 1 givenname: Feiyun surname: Tu fullname: Tu, Feiyun – sequence: 2 givenname: Yaqin surname: Qiao fullname: Qiao, Yaqin – sequence: 3 givenname: Wenjing surname: Zhao fullname: Zhao, Wenjing – sequence: 4 givenname: Tong surname: Wu fullname: Wu, Tong |
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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) |
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