Evolution of sexual size dimorphism in the wing musculature of <i>Drosophila</i>

Tracy, Claire; Nguyen, Janet; Abraham, Rayna; Shirangi, Troy R.

doi:10.7717/peerj.8360

Cited by 9 publications

(6 citation statements)

References 18 publications

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“…5D-F). These cell types are particularly compelling in light of the extensive literature identifying key roles for these sensory modalities in D. melanogaster's courtship 22,[130][131][132] , and because musculature is dimorphic among Drosophilids 133 . Genes involved in mitochondrial respiratory (ND-88) and actin assembly (forked) are found with the muscle population, as are two vision-related genes (Rh2 and Culd).…”

Section: Pervasive Expression Evolution Of Chemosensory Genesmentioning

confidence: 99%

Evolution of chemosensory tissues and cells across ecologically diverseDrosophilids

Bontonou

Saint-Leandre

Kafle

et al. 2023

Preprint

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Chemosensory systems display exceptional variation between species, but little is known about how the evolution of gene expression and cell types contribute to this diversity. We have generated transcriptomes for five chemosensory tissues across six ecologically diverse Drosophila species and integrated their analyses with single-cell datasets to address these questions. The evolution of chemosensory transcriptomes has been predominantly shaped by stabilizing selection, but several thousand genes have nevertheless evolved expression changes in each tissue. Phylogenetic analyses of differentially expressed genes revealed strong evidence that their expression changes have been driven by a combination of cis-regulatory and cell composition evolution. We have also found that chemosensory-related gene families have undergone pervasive expression level changes and numerous species-specific expression gains/losses. Follow-up experiments revealed several chemoreceptors that evolved novel patterns of tissue and cellular expression that likely contribute to sensory differences. Finally, analyses of the genes that are differentially expressed between sexes uncovered extensive species-specific differences. Among these rapid changes, we discovered a D. melanogaster-specific excess of male-biased gene expression in its forelegs and identified sensory and muscle cells as the primary source of this dimorphism. Together, our analyses provide new insights for understanding evolutionary changes in ecologically key tissues at both global and individual gene levels.

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Section: Pervasive Expression Evolution Of Chemosensory Genesmentioning

confidence: 99%

Evolution of chemosensory tissues and cells across ecologically diverseDrosophilids

Bontonou

Saint-Leandre

Kafle

et al. 2023

Preprint

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“…Most species produce at least one form of pulse song, whereas sine song production is far less common, and phylogenetic evidence suggests that pulse song is the ancestral song type in the genus (Tomaru and Yamada, 2011). Furthermore, the distribution of wing muscle sexual dimorphisms across the D. melanogaster species subgroup suggests that pulse song is ancestral to this group and that sine song evolved later (Tracy et al, 2020). This suggests that evolution adapted a subset of the ancestral pulse song circuit to create an additional song modality, sine song.…”

Section: Song Evolutionmentioning

confidence: 99%

Nested neural circuits generate distinct acoustic signals during Drosophila courtship

Lillvis,

Wang,

Shiozaki

et al. 2023

Preprint

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Animal sounds are produced by patterned vibrations of specific organs, but the neural circuits that drive these vibrations are not well defined in any animal. Here we provide a functional and synaptic map of most of the neurons in the Drosophila male ventral nerve cord (the analog of the vertebrate spinal cord) that drive complex, patterned song during courtship. Male Drosophila vibrate their wings toward females during courtship to produce two distinct song modes - pulse and sine song - with characteristic features that signal species identity and male quality. We identified song-producing neural circuits by optogenetically activating and inhibiting identified cell types in the ventral nerve cord (VNC) and by tracing their patterns of synaptic connectivity in the male VNC connectome. The core song circuit consists of at least eight cell types organized into overlapping circuits, where all neurons are required for pulse song and a subset are required for sine song. The pulse and sine circuits each include a feed-forward pathway from brain descending neurons to wing motor neurons, with extensive reciprocal and feed-back connections. We also identify specific neurons that shape the individual features of each song mode. These results reveal commonalities among diverse animals in the neural mechanisms that generate multiple motor patterns from a single set of muscles.

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“…Interestingly, there are also three instances of female enlarged muscles, namely, in D. erecta , D. ananassae , and D. prostipennis . [ 126 ] Could enlargement of key wing control muscles in these species be linked with prevalence or special attributes of female song? D. sechellia was not included in the recent study of muscle evolution, so it is unknown if there is an anatomical correlate to its prominent female song.…”

Section: How Conserved Is Drosophila Female Copulation Song?mentioning

confidence: 99%

Copulation Song inDrosophila: Do Females Sing to Change Male Ejaculate Allocation and Incite Postcopulatory Mate Choice?

Kerwin

Philipsborn

2020

BioEssays

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Drosophila males sing a courtship song to achieve copulations with females. Females were recently found to sing a distinct song during copulation, which depends on male seminal fluid transfer and delays female remating. Here, it is hypothesized that female copulation song is a signal directed at the copulating male and changes ejaculate allocation. This may alter female remating and sperm usage, and thereby affect postcopulatory mate choice. Mechanisms of how female copulation song is elicited, how males respond to copulation song, and how remating is modulated, are considered. The potential adaptive value of female signaling during copulation is discussed with reference to vertebrate copulation calls and their proposed function in eliciting mate guarding. Female copulation song may be widespread within the Drosophila genus. This newly discovered behavior opens many interesting avenues for future research, including investigation of how sexually dimorphic neuronal circuits mediate communication between nervous system and reproductive organs.

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Evolution of sexual size dimorphism in the wing musculature of Drosophila

Cited by 9 publications

References 18 publications

Evolution of chemosensory tissues and cells across ecologically diverseDrosophilids

Evolution of chemosensory tissues and cells across ecologically diverseDrosophilids

Nested neural circuits generate distinct acoustic signals during Drosophila courtship

Copulation Song inDrosophila: Do Females Sing to Change Male Ejaculate Allocation and Incite Postcopulatory Mate Choice?

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