The first chromosome-level annotated reference genome for Chrosomus eos, the Northern Redbelly Dace

Area of Science:

• Ichthyology
• Genomics
• Evolutionary Biology

Background:

• Teleost fish hybridization is common but its evolutionary impact is not fully understood.
• The Chrosomus genus exhibits complex hybridization, notably between Chrosomus eos and Chrosomus neogaeus, forming a unique unisexual hybrid lineage.
• Previous genomic studies were limited by the absence of reference genomes for these species.

Purpose of the Study:

• To generate a high-quality, chromosome-level reference genome for Chrosomus eos.
• To enable future genomic research on the Chrosomus hybrid complex.
• To analyze the syntenic relationship between the new Chrosomus eos genome and the zebrafish (Danio rerio) genome.

Main Methods:

• High-quality, chromosome-level genome assembly using Dovetail Genomics technology.
• Genome completeness assessment.
• Comparative synteny analysis with the zebrafish (Danio rerio) genome.

Main Results:

• A novel, high-quality, chromosome-level genome for Chrosomus eos was successfully produced.
• The genome assembly was analyzed for completeness.
• The syntenic relationship between the Chrosomus eos and Danio rerio genomes was investigated.

Conclusions:

• The newly generated Chrosomus eos genome provides a crucial resource for understanding fish hybridization.
• This work overcomes previous genomic limitations in studying the Chrosomus hybrid complex.
• Future research can now explore the genetic basis of hybridization and gynogenetic reproduction in these species.