Abstract

Abstract The genomes of several vertebrates, including six mammals, the chicken, Xenopus and four ray-finned fishes have been sequenced or are currently being sequenced to provide a better understanding of the human genome through comparative analysis. However, this list does not include cartilaginous fishes, which are the most basal living jawed vertebrates [1]. The genomes of the current ‘popular' cartilaginous fishes such as the nurse shark, dogfish, and horn shark are larger than the human genome (∼3800 Mb to 7000 Mb) [2], and are not attractive for whole-genome sequencing. Here, we report the characterization of the relatively small genome (1200 Mb) of a cartilaginous fish, the elephant fish ( Callorhinchus milii ), and propose it as a model for whole-genome sequencing.

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