Abstract
The Himalayan giant honeybee, Apis laboriosa, is the largest individual honeybee with major ecological and economic importance in high-latitude environments. However, our understanding of its environmental adaptations is circumscribed by the paucity of genomic data for this species. Here, we provide a draft genome of wild A. laboriosa, along with a comparison to its closely related species, Apis dorsata. The draft genome of A. laboriosa based on the de novo assembly is 226.1 Mbp in length with a scaffold N50 size of 3.34 Mbp, a GC content of 32.2%, a repeat content of 6.86%, and a gene family number of 8,404. Comparative genomics analysis revealed that the genes in A. laboriosa genome have undergone stronger positive selection (2.5 times more genes) and more recent duplication/loss events (6.1 times more events) than those in the A. dorsata genome. Our study implies the potential molecular mechanisms underlying the high-altitude adaptation of A. laboriosa and will catalyze future comparative studies to understand the environmental adaptation of modern honeybees.
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