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The mutational effect of the maleless (mle) gene in Drosophila has been reexamined. Earlier work had suggested that mle along with other male-lethal genes was responsible for hypertranscription of the X chromosome in males to bring about dosage compensation. Prompted by studies on dosage sensitive regulatory genes, we tested for effects of mlets on the phenotypes of 16 X or autosomal mutations in adult escapers of lethality. In third instar larvae, prior to the major lethal phase of mle, we examined activities of 6 X or autosomally encoded enzymes, steady state mRNA levels of 15 X-linked or autosomal genes and transcripts from two large genomic segments derived from either the X or from chromosome 2 and present in yeast artificial chromosomes. In contrast to the previously hypothesized role, we detected pronounced effects of mle on the expression of both X-linked and autosomal loci such that a large proportion of the tested genes were increased in expression, while only two X-linked loci were reduced. The most prevalent consequence was an increase of autosomal gene expression, which can explain previously observed reduced X:autosome transcription ratios. These observations suggest that if mle plays a role in the discrimination of the X and the autosomes, it may do so by modification of the effects of dosage sensitive regulatory genes.

Effects of the maleless mutation on X and autosomal gene expression in Drosophila melanogaster.