Scholarlink

Abstract <p>Recent integrative studies combining morphological, taxonomic, and molecular evidence have proposed the recognition of <i>Micromys pygmaeus</i> as a new species within the genus <i>Micromys</i> (Rodentia: Muridae). To investigate the evolutionary implications of this taxonomic proposal, we assembled the complete mitogenome of <i>M. pygmaeus</i> and generated an additional mitochondrial genome sequence for <i>M. minutus</i>. Comparative mitogenomic analysis revealed conserved genomic architecture across the genus, with total lengths ranging from 16 232 to 16 243 bp, maintaining consistent gene order, nucleotide composition trends (A + T conet), and codon usage patterns. Notably, <i>M. pygmaeus</i> exhibited a unique 35 bp incomplete repeat motif in its <i>nad6</i> gene (period size: 15 bp; copy number: 2.3; sequence similarity: 90%), representing the first documented structural variation in <i>Micromys</i> mitogenomes. Phylogenomic reconstruction using concatenated mitochondrial protein-coding genes via Bayesian inference and maximum likelihood consistently resolved three well-supported clades within <i>Micromys</i>, with strong nodal support (posterior probability &gt;0.98, bootstrap &gt;95%). Topological analyses further confirmed the genus’ sister relationship to the tribe Rattini, providing a robust framework for understanding murine radiation patterns.</p>

错误：搜索内容不能为空，请输入英文关键词
错误：关键词超出字数限制，请精简
高级检索

The First Analysis of the Complete Mitochondrial Genome of the Chinese Endemic Species, Micromys pygmaeus, and Determination of Phylogenetic Relationships of the Genus Micromys within the Subfamily Murinae

  • 期刊论文

  • 发表日期：

    2025年7月1日

查看全文
  • Chengxin Zhou,
  • Siyu Yang,
  • Zongyun Zhang,
  • Qiong Wang,
  • Abu ul Hassan Faiz,
  • Shunde Chen

摘要

Abstract

Recent integrative studies combining morphological, taxonomic, and molecular evidence have proposed the recognition of Micromys pygmaeus as a new species within the genus Micromys (Rodentia: Muridae). To investigate the evolutionary implications of this taxonomic proposal, we assembled the complete mitogenome of M. pygmaeus and generated an additional mitochondrial genome sequence for M. minutus. Comparative mitogenomic analysis revealed conserved genomic architecture across the genus, with total lengths ranging from 16 232 to 16 243 bp, maintaining consistent gene order, nucleotide composition trends (A + T conet), and codon usage patterns. Notably, M. pygmaeus exhibited a unique 35 bp incomplete repeat motif in its nad6 gene (period size: 15 bp; copy number: 2.3; sequence similarity: 90%), representing the first documented structural variation in Micromys mitogenomes. Phylogenomic reconstruction using concatenated mitochondrial protein-coding genes via Bayesian inference and maximum likelihood consistently resolved three well-supported clades within Micromys, with strong nodal support (posterior probability >0.98, bootstrap >95%). Topological analyses further confirmed the genus’ sister relationship to the tribe Rattini, providing a robust framework for understanding murine radiation patterns.