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Related Experiment Video

Updated: Apr 9, 2026

A Noninvasive Hair Sampling Technique to Obtain High Quality DNA from Elusive Small Mammals
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Genomic Analysis and Population Divergence Driven by Geographic Isolation in Neotetracus sinensis.

Jianxuan Zhou1, Nannan Chen1, Weihao Dou1

  • 1School of Life Sciences and Medicine Shandong University of Technology Zibo Shandong China.

Ecology and Evolution
|April 8, 2026
PubMed
Summary

Geographic isolation in Hengduan Mountains shaped genomic variation in Neotetracus sinensis. Key genomic islands, including the MGMT gene, show adaptation to montane environments.

Keywords:
Neotetracus sinensisPSMC/MSMC2 analyseschromosome‐level genomegenetic diversitypopulation structure

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Area of Science:

  • Evolutionary biology
  • Genomics
  • Zoology

Background:

  • Mountain systems act as natural laboratories for evolution due to restricted gene flow.
  • Neotetracus sinensis, endemic to Hengduan Mountains' montane forests, exhibits limited dispersal.
  • Understanding genomic divergence is crucial for species adaptation in isolated environments.

Purpose of the Study:

  • To investigate how geographic isolation influences genomic variation in Neotetracus sinensis.
  • To identify genomic regions and candidate genes associated with adaptation in isolated populations.
  • To reconstruct demographic history and assess population structure.

Main Methods:

  • Assembly of a high-quality reference genome for Neotetracus sinensis.
  • Resequencing of individuals from two isolated ranges: Gaoligong Mountains (GLG) and Wuliang Mountains (WL).
  • Genome-wide SNP analysis, Principal Component Analysis (PCA), phylogenetic reconstruction, and demographic modeling.
  • Identification of genomic islands using Fst and Dxy divergence metrics.

Main Results:

  • Clear population structure resolved into two distinct clades, indicating significant genetic divergence.
  • Demographic reconstructions revealed a shared expansion event ~1.0 Mya followed by a prolonged decline.
  • Identification of 5 core genomic islands, with the DNA repair gene MGMT highlighted for environmental adaptation.
  • Functional enrichment analysis pointed to pathways involved in synaptic signaling, intracellular transport, and circadian regulation.

Conclusions:

  • Geographic isolation has profoundly shaped genomic divergence in Neotetracus sinensis populations.
  • Specific genomic regions and genes, such as MGMT, are likely involved in adaptation to montane environments.
  • The study provides a genomic framework for understanding evolutionary processes in isolated mountain ecosystems.