First chromosome-level genome assembly of the colonial tunicate Botryllus schlosseri
De Thier, O.; Tawfeeq, M. M.; Faure, R.; Lebel, M.; Dru, P.; Blanchoud, S.; Alie, A.; Brown, F. D.; Flot, J.-F.; Tiozzo, S.
Show abstract
Botryllus schlosseri (Tunicata) is a colonial chordate that has long been studied for its multiple developmental pathways and regenerative abilities and its genetically determined allorecognition system based on a polymorphic locus that controls chimerism and cell parasitism. We present the first chromosome-level genome assembly from an isogenic colony of B. schlosseri clade A1 using a mix of long and short reads scaf-folded using Hi-C. This haploid assembly spans 533 Mb, of which 96% are found in 16 chromosome-scale scaffolds. With a BUSCO completeness of 91.2%, this complete and contiguous B. schlosseri genome assembly provides a valuable genomic resource for the scientific community and lays the foundation for future investigations into the molecular mechanisms underlying coloniality, regeneration, histocompatibility, and the immune system in tunicates.
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