New Genome Assemblies for Poeciliidae: A Foundation for Adaptation Studies

Area of Science:

• Evolutionary Biology
• Genomics
• Ecology

Background:

• The family Poeciliidae offers natural replicate systems for studying adaptation due to independent colonization of hydrogen-sulfide-rich springs.
• Limited genomic resources hinder comprehensive studies of adaptation and convergent evolution in many Poeciliidae species.

Purpose of the Study:

• To generate high-quality, chromosome-level genome assemblies for key Poeciliidae populations.
• To provide essential genomic resources for studying adaptation and convergent evolution in this family.
• To analyze repeat content and model historical population size changes.

Main Methods:

• Whole-genome sequencing and assembly of six Poecilia and Gambusia populations.
• Chromosome-level genome assembly and annotation.
• Comparative analysis of repeat content and population genetics.

Main Results:

• Six high-quality, chromosome-level, annotated genome assemblies were produced for Poecilia and Gambusia.
• Five of these assemblies represent novel genomic resources for their respective species or ecotypes.
• The new assemblies significantly improve upon existing reference genome contiguity, enabling detailed evolutionary analyses.

Conclusions:

• The newly generated genome assemblies are invaluable resources for Poeciliidae research.
• These resources will facilitate deeper investigations into the genetic basis of adaptation and convergent evolution.
• Comparative genomic analyses can now be performed to understand historical population dynamics.