Regulation of the gene Sex-lethal: a comparative analysis of Drosophila melanogaster and Drosophila subobscura.

Genetics
L O PenalvaLucas Sánchez

Abstract

The Drosophila gene Sex-lethal (Sxl) controls the processes of sex determination and dosage compensation. A Drosophila subobscura genomic fragment containing all the exons and the late and early promotors in the Sxl gene of D. melanogaster was isolated. Early Sxl expression in D. subobscura seems to be controlled at the transcriptional level, possibly by the X:A signal. In the region upstream of the early Sxl transcription initiation site are two conserved regions suggested to be involved in the early activation of Sxl. Late Sxl expression in D. subobscura produces four transcripts in adult females and males. In males, the transcripts have an additional exon which contains three translational stop codons so that a truncated, presumably nonfunctional Sxl protein is produced. The Sxl pre-mRNA of D. subobscura lacks the poly-U sequence presented at the polypirimidine tract of the 3' splice site of the male-specific exon present in D. melanogaster. Introns 2 and 3 contain the Sxl-binding poly-U stretches, whose localization in intron 2 varies but in intron 3 is conserved. The Sxl protein is fully conserved at the amino acid level in both species.

Citations

May 10, 2003·Development Genes and Evolution·Timothy Morgan JinksPaul Schedl
Apr 11, 2006·Genome Génome / Conseil National De Recherches Canada·Walther TrautKen Sahara
Apr 11, 2006·Genome Génome / Conseil National De Recherches Canada·Teruyuki NiimiWalther Traut
Jul 8, 1997·Proceedings of the National Academy of Sciences of the United States of America·B GranadinoL Sánchez
Sep 11, 2003·Microbiology and Molecular Biology Reviews : MMBR·Luiz O F Penalva, Lucas Sánchez
Feb 5, 2000·Biochimica Et Biophysica Acta·V Iourgenko, L R Levin
Sep 25, 1998·Science·I Marín, B S Baker
Sep 30, 2010·Journal of Genetics·Daniel Bopp
Sep 30, 2010·Journal of Genetics·J N Shukla, J Nagaraju
May 3, 2000·Genome Génome / Conseil National De Recherches Canada·V SievertW Traut

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