Insights into the Evolution of Neoteny from the Genome of the Asian Icefish Protosalanx chinensis

Salangids, known as Asian icefishes, represent a peculiar radiation within the bony fish order Protacanthopterygii where adult fish retain larval characteristics such as transparent and miniaturized bodies and a cartilaginous endoskeleton into adulthood. Here, we report a de novo genome of Protosala...

Full description

Bibliographic Details
Published in:iScience
Main Authors: Zhang, Jie, Qi, Jiwei, Shi, Fanglei, Pan, Huijuan, Liu, Meng, Tian, Ran, Geng, Yuepan, Li, Huaying, Qu, Yujie, Chen, Jinping, Seim, Inge, Li, Ming
Format: Text
Language:English
Published: Elsevier 2020
Subjects:
Article
Icefish
Online Access:http://www.ncbi.nlm.nih.gov/pmc/articles/PMC7327861/
http://www.ncbi.nlm.nih.gov/pubmed/32593955
https://doi.org/10.1016/j.isci.2020.101267
Description
Summary:Salangids, known as Asian icefishes, represent a peculiar radiation within the bony fish order Protacanthopterygii where adult fish retain larval characteristics such as transparent and miniaturized bodies and a cartilaginous endoskeleton into adulthood. Here, we report a de novo genome of Protosalanx chinensis, the most widely distributed salangid lineage. The P. chinensis genome assembly is more contiguous and complete than a previous assembly. We estimate that P. chinensis, salmons, trouts, and pikes diverged from a common ancestor 185 million years ago. A juxtaposition with other fish genomes revealed loss of the genes encoding ectodysplasin-A receptor (EDAR), SCPP1, and four Hox proteins and likely lack of canonical fibroblast growth factor 5 (FGF5) function. We also report genomic variations of P. chinensis possibly reflecting the immune system repertoire of a species with a larval phenotype in sexually mature individuals. The new Asian icefish reference genome provides a solid foundation for future studies.

Similar Items