A Chromosome-level genome assembly of the striped catfish (Pangasianodon
hypophthalmus) reveals molecular mechanisms for its high-fat trait
Abstract
Striped catfish (Pangasianodon hypophthalmus), belonging to the
Pangasiidae family, has become an economically important fish with wide
cultivation in Southeast Asia. Owing to the high-fat trait, it is always
considered as an oily fish. In our present study, a high-quality genome
assembly of the striped catfish was generated by integration of short
reads from an Illumina Hiseq Xten platform, long reads from a Nanopore
platform, and Hi-C sequencing data. This assembled genome is 731.7 Mb in
length, with a scaffold N50 of 29.5 Mb and anchoring on 30 chromosomes.
A total 18,895 protein-coding genes were predicted, among them 98.46%
were functionally annotated. Interestingly, we identified a tandem
triplication of fatty acid binding protein 1 gene (fabp1; thereby named
as fabp1-1, fabp1-2 and fabp1-3 respectively), which may be critical for
molecular regulation of the high-fat trait in the striped catfish.
Compared with Fabp1-1 (similar to the conserved Fabp1 in various
vertebrate species), the R126T mutation may potentially affect the fatty
acid binding capacity of the Fabp1 isotypes 2 and 3. In summary, we
report a high-quality chromosome-level genome assembly of the striped
catfish, which provides a valuable genetic resource for biomedical
studies on the high-fat trait, and laying a foundation for practical
aquaculture and molecular breeding of this international teleost
species.