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Maternal provision of non-sex-specific transformer messenger RNA in sex determination of the wasp Asobara tabida

Geuverink, E., Verhulst, E. C., van Leussen, M., van de Zande, L. & Beukeboom, L. W., Feb-2018, In : Insect Molecular Biology. 27, 1, p. 99-109 11 p.

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In many insect species maternal provision of sex-specifically spliced messenger RNA (mRNA) of sex determination genes is an essential component of the sex determination mechanism. In haplodiploid Hymenoptera, maternal provision in combination with genomic imprinting has been shown for the parasitoid Nasonia vitripennis, known as maternal effect genomic imprinting sex determination (MEGISD). Here, we characterize the sex determination cascade of Asobara tabida, another hymenopteran parasitoid. We show the presence of the conserved sex determination genes doublesex (dsx), transformer (tra) and transformer-2 (tra2) orthologues in As. tabida. Of these, At-dsx and At-tra are sex-specifically spliced, indicating a conserved function in sex determination. At-tra and At-tra2 mRNA is maternally provided to embryos but, in contrast to most studied insects, As. tabida females transmit a non-sex-specific splice form of At-tra mRNA to the eggs. In this respect, As. tabida sex determination differs from the MEGISD mechanism. How the paternal genome can induce female development in the absence of maternal provision of sex-specifically spliced mRNA remains an open question. Our study reports a hitherto unknown variant of maternal effect sex determination and accentuates the diversity of insect sex determination mechanisms.

Original languageEnglish
Pages (from-to)99-109
Number of pages11
JournalInsect Molecular Biology
Volume27
Issue number1
Publication statusPublished - Feb-2018

    Keywords

  • maternal provision, hymenoptera, sex determination, transformer, doublesex, transformer-2, DETERMINATION PATHWAY, NASONIA-VITRIPENNIS, GENE TRANSFORMER-2, DROSOPHILA, DOUBLESEX, INSECTS, PROTEIN, ANASTREPHA, EVOLUTION, DIPTERA

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