RRC ID 67571
Author Liang HQ, Katoh T, Sato K, Yamamoto D, Wen SY.
Title Evolution of a neuromuscular sexual dimorphism in the Drosophila montium species group.
Journal Sci Rep
Abstract While epigamic traits likely evolve via sexual selection, the mechanism whereby internal sexual dimorphism arises remains less well understood. Seeking clues as to how the internal sexual dimorphism evolved, we compared the abdominal musculature of 41 Drosophila montium group species, to determine whether any of these species carry a male-specific muscle of Lawrence (MOL). Our quantitative analysis revealed that the size of a sexually dimorphic MOL analog found in 19 montium group species varied widely from species to species, suggesting the gradual evolution of this sexually dimorphic neuromuscular trait. We attempted the ancestral state reconstitution for the presence or absence of the neuromuscular sexual dimorphism in the A5 segment; the neuromuscular sexual dimorphism existed in an old ancestor of the montium group, which was lost in some of the most recent common ancestors of derived lineages, and subsequently some species regained it. This loss-and-gain history was not shared by evolutionary changes in the courtship song pattern, even though both traits were commonly regulated by the master regulator male-determinant protein FruM. It is envisaged that different sets of FruM target genes may serve for shaping the song and MOL characteristics, respectively, and, as a consequence, each phenotypic trait underwent a distinct evolutionary path.
Volume 11(1)
Pages 15272
Published 2021-7-27
DOI 10.1038/s41598-021-94722-3
PII 10.1038/s41598-021-94722-3
PMID 34315982
PMC PMC8316392
MeSH Animals Drosophila / physiology* Female Male Muscles / metabolism* Nervous System / metabolism Sex Characteristics*
IF 3.998