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Authors: Rödelsperger, Christian and Meyer, Jan M and Prabh, Neel and Lanz, Christa and Bemm, Felix and Sommer, Ralf J

The nematode Pristionchus pacificus is an established model for integrative evolutionary biology and comparative studies with Caenorhabditis elegans. While an existing genome draft facilitated the identification of several genes controlling various developmental processes, its high degree of fragmentation complicated virtually all genomic analyses. Here, we present a de novo genome assembly from single-molecule, long-read sequencing data consisting of 135 P. pacificus contigs. When combined with a genetic linkage map, 99% of the assembly could be ordered and oriented into six chromosomes. This allowed us to robustly characterize chromosomal patterns of gene density, repeat content, nucleotide diversity, linkage disequilibrium, and macrosynteny in P. pacificus. Despite widespread conservation of synteny between P. pacificus and C. elegans, we identified one major translocation from an autosome to the sex chromosome in the lineage leading to C. elegans. This highlights the potential of the chromosome-scale assembly for future genomic studies of P. pacificus. Copyright © 2017 The Author(s). Published by Elsevier Inc. All rights reserved.

Journal: Cell reports
DOI: 10.1016/j.celrep.2017.09.077
Year: 2017

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