Abstract
Epigenetic modifications are known to influence phenotypes such as morphology, behaviour and learning in insects. However, the role of the epigenome in courtship behaviour in Drosophila melanogaster remains unexplored. Epigenetic control such as acetylation and deacetylation of histones play an important role in the expression profile of fruitless, a gene implicated in the male courtship response. To investigate how epigenetic modifications of fruitless would affect courtship behaviour, we modified the epigenome of D. melanogaster using CRISPR-dCAS9. Here we show that fruitless followed an all-or-none response to elicit male courtship behaviour by creating transgenic lines of D. melanogaster. We assessed transcription states of fruitless in the transgenic lines using RT-qPCR, and behavioural changes using the RING assay and the Courtship Index. Our results demonstrated that males overexpressing fruitless displayed more sexually aggressive behaviour, whilst males underexpressing fruitless became behaviourally sterile. These findings show that epigenetics is implicated in the genetic control of courtship behaviour in D. melanogaster. Together, these results will contribute to the understanding of neurological memory as well as behavioural epigenetics in D. melanogaster.
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Acknowledgements
We would like to thank Rachel Seah, Bernetta Kwek, Tirtha Banerjee, Suriya Narayanan Murugesan, Jocelyn Wee, Tan Lu Wee, Dr. Antonia Monteiro and other members of the Butterfly/Spider Lab for guiding and overseeing us throughout our experiments. This study was partially supported by the Ministry of Education AcRF grant (R-154-000-B72-114).
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Appendix
Appendix
Note
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1.
P1 promoter sequence: 5’TGCTGCTGTCGCCGTGCTGCGCCTGCTGCTGCTGCGTTTCGTTGGTGCTGCGACAGCAGAGTCGTTGCAACAATCGCAGCTTGCACATCCAGCAGCAGTCAGTTG GACGCGGCGGCTCCTTCAGCAAGGACGCACAGCTCACACAATCCCTTCGAAGGAAATCAGCAGCCGACATACCGAACGACCTGCCACAA
CATTCCA3’
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2.
For CRISPRa, the target sequence was CAGCAGCAGTCAGTTGGACGCGG (+). There were no 20 mer or 12 mer off-target sites. The corresponding sgRNA was: 5′GAAATTAATACGACTCACTATAGGCAGCAG CAGTCAGTTGGACGGTTTTAGAGCTAGAAATAGC3′
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3.
For CRISPRi, the target sequence was CCGACATACCGAACGACCTGCCA (−). There were no 20 mer or 12 mer off-target sites. The most corresponding sgRNA was: 5′GAAATTAATACGACTCACTATAGGT GGCAGGTCGTTCGGTATGTGTTTTAGAGCTAGAAATAGC3′.
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4.
Gene expression quantification formula (ΔΔCT method): The fold change in gene expression is given by the formula 2(Δ(ΔCTE−ΔCTC)) where ΔCTE and ΔCTC are defined as the difference between the gene of interest and the reference gene (Δ(GOI-RG)) of the experiment and control respectively. In this case, the gene of interest was fruitless, whilst the reference gene was ACT42A.
Supplementary Fig. 45.4.
Legend:
Samples 1, 2 and 3 are mRNA extracts from WT protocerebrum converted to cDNA, which was used as the template for PCR. The control (ctrl) used was PCR performed without any template DNA.
Supplementary Table 45.1.
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Quah, Y.C.R., Li, D. (2022). Epigenetic Modification of fruitless in the Protocerebrum Influences Male Drosophila Courtship Behaviour. In: Guo, H., Ren, H., Wang, V., Chekole, E.G., Lakshmanan, U. (eds) IRC-SET 2021. Springer, Singapore. https://doi.org/10.1007/978-981-16-9869-9_45
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