Abstract:
:The Atlantic herring is a model species for exploring the genetic basis for ecological adaptation, due to its huge population size and extremely low genetic differentiation at selectively neutral loci. However, such studies have so far been hampered because of a highly fragmented genome assembly. Here, we deliver a chromosome-level genome assembly based on a hybrid approach combining a de novo Pacific Biosciences (PacBio) assembly with Hi-C-supported scaffolding. The assembly comprises 26 autosomes with sizes ranging from 12.4 to 33.1 Mb and a total size, in chromosomes, of 726 Mb, which has been corroborated by a high-resolution linkage map. A comparison between the herring genome assembly with other high-quality assemblies from bony fishes revealed few inter-chromosomal but frequent intra-chromosomal rearrangements. The improved assembly facilitates analysis of previously intractable large-scale structural variation, allowing, for example, the detection of a 7.8-Mb inversion on Chromosome 12 underlying ecological adaptation. This supergene shows strong genetic differentiation between populations. The chromosome-based assembly also markedly improves the interpretation of previously detected signals of selection, allowing us to reveal hundreds of independent loci associated with ecological adaptation.
journal_name
Genome Resjournal_title
Genome researchauthors
Pettersson ME,Rochus CM,Han F,Chen J,Hill J,Wallerman O,Fan G,Hong X,Xu Q,Zhang H,Liu S,Liu X,Haggerty L,Hunt T,Martin FJ,Flicek P,Bunikis I,Folkvord A,Andersson Ldoi
10.1101/gr.253435.119subject
Has Abstractpub_date
2019-11-01 00:00:00pages
1919-1928issue
11eissn
1088-9051issn
1549-5469pii
gr.253435.119journal_volume
29pub_type
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