What question did this study set out to answer?

To present the genome assembly of the sei whale, including its haplotypes and gene annotation.

January 6, 2026Wellcome Open Research0 citationsOpen Access

The genome sequence of the sei whale, Balaenoptera borealis (Lesson, 1828) (Artiodactyla: Balaenopteridae)

NDNicholas J. Davison HDHayley A. Douglas MAMorin Phillip A.NOAA National Marine Fisheries Service

Key Points

To present the genome assembly of the sei whale, including its haplotypes and gene annotation.
Genome sequencing of an individual female Balaenoptera borealis
Assembly of two haplotypes with specified lengths
Gene annotation conducted on Ensembl
Assembly includes two haplotypes of 3,234.56 and 2,988.82 megabases
79.31% of haplotype 1 is scaffolded into 22 chromosomal pseudomolecules
Gene annotation identified 18,485 protein-coding genes

Abstract

We present a genome assembly from an individual female Balaenoptera borealis (sei whale; Chordata; Mammalia; Artiodactyla; Balaenopteridae). The assembly contains two haplotypes with total lengths of 3 234.56 megabases and 2 988.82 megabases. Most of haplotype 1 (79.31%) is scaffolded into 22 chromosomal pseudomolecules, including the X sex chromosome. Haplotype 2 was assembled to scaffold level. The mitochondrial genome has also been assembled, with a length of 16.41 kilobases. Gene annotation of this assembly on Ensembl identified 18 485 protein-coding genes. This assembly was generated as part of the Darwin Tree of Life project, which produces reference genomes for eukaryotic species found in Britain and Ireland.

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