The chromosomal genome of Mastigoproctus giganteus exhibits characteristics of pre-Silurian whole-genome duplication.

abstract

Among arachnids, chromosome-level genome assemblies have greatly accelerated the understanding of gene family evolution and developmental genomics in major groups such as spiders (Araneae), ticks and ticks (Acariformes and Parasitales). I did. Among other poorly studied arachnids that completely lack genome assemblies is the clade Pedipalpi, which consists of three orders that form a sister group of spiders that have diverged over 400 million years . We fill this gap by generating the first chromosome-level assembly from a single specimen of Vinegaron Mastigoproctus giganteus (Uropygi). We show that this highly complete genome retains the morphological requirements of many gene families that have undergone lineage-specific derivation within more diverse spiders. Consistent with the phylogenetic position of Uropigi, macrosynteny in the M. giganteus genome supports features of ancient whole-genome duplication.