Role of the male BmDSX protein in the sexual differentiation of <i>Bombyx mori</i>

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<jats:p><jats:bold>Summary </jats:bold> The sex determination pathway is different between <jats:italic>Drosophila melanogaster</jats:italic> and <jats:italic>Bombyx mori</jats:italic> in the initial signal. Here we show evidence that the sex determination pathway in <jats:italic>B. mori</jats:italic> is similar to that of <jats:italic>D. melanogaster</jats:italic> at the level of the terminal regulator, <jats:italic>doublesex</jats:italic> (<jats:italic>dsx</jats:italic>), which is essential for the proper differentiation of the sexually dimorphic somatic features of <jats:italic>D. melanogaster</jats:italic>. In <jats:italic>B. mori</jats:italic>, a homolog of <jats:italic>dsx</jats:italic> (<jats:italic>Bmdsx</jats:italic>) is expressed in various tissues, and its primary transcript is alternatively spliced in males and females to yield sex‐specific mRNAs that encode male‐specific (BmDSXM) and female‐specific (BmDSXF) polypeptides. In the studies reported here, transgenic silkworms carrying a construct with a <jats:italic>Bmdsx</jats:italic> male cDNA placed under the control of either an <jats:italic>hsp70</jats:italic> promoter or a <jats:italic>Bombyx actin3</jats:italic> promoter were generated by <jats:italic>piggyBac</jats:italic>‐mediated germline transformation. Ectopic expression of the male cDNA in females resulted in abnormal differentiation of certain female‐specific genital organs and caused partial male differentiation in female genitalia. Transgenic analysis also revealed that the expression of BmDSXM in females caused repression of the female‐specifically expressed gene, the vitellogenin gene, and also resulted in activation of the pheromone‐binding protein gene that is dominantly expressed in males. These results provide evidence that the role of BmDSXM includes the activation of some aspects of male differentiation as well as the repression of female differentiation. Taken together with our previous data on the function of BmDSXF, we can conclude that <jats:italic>Bmdsx</jats:italic> is a double‐switch gene at the final step in the sex‐determination cascade of <jats:italic>B. mori</jats:italic>.</jats:p>

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