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npstat: An Efficient Tool to Explore the Population Genome Variability and Divergence Using Pool Sequencing Data.

Sebastian E Ramos-Onsins1, Sara Guirao-Rico2,3, Ahmed Hafez4

  • 1Plant and Animal Genomics Program, Centre for Research in Agricultural Genomics (CRAG), Consejo Superior de Investigaciones Científicas-Institute of Agrifood Research and Technology-Autonomous University of Barcelona-University of Barcelona, Bellaterra, Spain. sebastian.ramos@cragenomica.es.

Methods in Molecular Biology (Clifton, N.J.)
|August 19, 2025
PubMed
Summary
This summary is machine-generated.

Pool sequencing is an efficient method for estimating population-level nucleotide variability, especially for small organisms or challenging sample types. The npstat software aids in analyzing pooled DNA sequences to assess genetic diversity and evolutionary patterns.

Keywords:
DivergencePolymorphismPopulation genomicsProportion of beneficial substitutionsSliding window analyses

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Area of Science:

  • Population genetics
  • Molecular ecology
  • Bioinformatics

Background:

  • Pool sequencing offers a cost-effective strategy for genetic studies when individual identification is not required.
  • It is particularly useful for organisms with limited DNA or in complex samples like microbiomes.
  • Key experimental design factors include the number of individuals pooled and the mean read depth.

Purpose of the Study:

  • To introduce and describe the functionality of the npstat software.
  • To facilitate the estimation of nucleotide variability and variant frequency patterns from pooled sequencing data.
  • To enable neutrality tests and calculations of adaptive evolution metrics.

Main Methods:

  • Utilizes pooled DNA sequencing data.
  • Employs the npstat software for statistical analysis.
  • Incorporates GTF annotation files and outgroup data for specific analyses (e.g., MKT approach).

Main Results:

  • The npstat software calculates various estimates of nucleotide variability.
  • It performs neutrality tests to assess evolutionary forces.
  • It quantifies synonymous and nonsynonymous variants and the proportion of beneficial substitutions (alpha).

Conclusions:

  • Pool sequencing is a powerful approach for population genetics research, especially in ecological contexts.
  • The npstat software provides a comprehensive tool for analyzing pooled sequencing data.
  • This approach enhances the study of genetic diversity and adaptation in populations.