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- Title
Inside the Shark Nursery: The Evolution of Live Birth in Cartilaginous Fish.
- Authors
McGrath, Casey
- Abstract
I A new study in Genome Biology and Evolution reveals that egg yolk proteins may have been co-opted to provide maternal nutrition in live-bearing sharks and their relatives. i While giving birth to live young is a trait that most people associate with mammals, this reproductive mode - also known as viviparity - has evolved over 150 separate times among vertebrates, including over 100 independent origins in reptiles, 13 in bony fishes, 9 in cartilaginous fishes, 8 in amphibians, and 1 in mammals. To shed light on the functions of VTG and its receptor in these species, the authors compared tissue-by-tissue transcriptome data from one egg-laying shark (the cloudy catshark) and two viviparous sharks. "We predicted the retention of egg yolk protein genes in the shark genomes because live-bearing sharks rely partly on nutrition supply from the egg yolk", says Kuraku.
- Subjects
CHONDRICHTHYES; SHARKS; BIOLOGICAL evolution; EGG yolk; YOLK sac; TASMANIAN devil; CELL culture
- Publication
Genome Biology & Evolution, 2023, Vol 15, Issue 3, p1
- ISSN
1759-6653
- Publication type
Article
- DOI
10.1093/gbe/evad037