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The sex‐determining gene tra of Drosophila: molecular cloning and transformation studies.
Author(s) -
Butler B.,
Pirrotta V.,
IrmingerFinger I.,
Nöthiger R.
Publication year - 1986
Publication title -
the embo journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 7.484
H-Index - 392
eISSN - 1460-2075
pISSN - 0261-4189
DOI - 10.1002/j.1460-2075.1986.tb04689.x
Subject(s) - biology , genetics , transformation (genetics) , molecular cloning , cloning (programming) , gene , drosophila (subgenus) , drosophila melanogaster , computational biology , gene expression , computer science , programming language
In Drosophila, the primary signal for sex determination is given by the ratio of X chromosomes to sets of autosomes (X:A). The primary signal is read by a key gene (Sxl) and transmitted down to the differentiation genes by the subordinate control genes tra, tra‐2, ix and dsx. Mutations in tra transform chromosomal females (X/X; tra/tra) into sterile males (pseudomales). We have cloned the tra region by microdissection and chromosomal walking. We identified the gene using deficiency breakpoints, DNA aberrations in three different alleles of tra and by P‐mediated transformation. A 3.8‐kb fragment perfectly rescued the mutant phenotype of X/X; tra/tra flies, showing that it contained all the necessary information to restore female‐specific functions in the mutant flies. We present evidence that most of the function of tra can be provided by a subsegment of 2 kb that is differentially transcribed or processed in males and females.