Mutations in the su(s) gene affect RNA processing in Drosophila melanogaster

Area of Science:

• Molecular Biology
• Genetics
• Developmental Biology

Background:

• The yellow gene in Drosophila melanogaster is crucial for pigmentation.
• P elements are transposable genetic elements that can cause mutations.
• Suppressor of sable [su(s)] is a gene involved in regulating gene expression.

Purpose of the Study:

• To investigate the impact of suppressor of sable [su(s)] gene mutations on P element-induced yellow alleles.
• To elucidate the mechanism by which su(s) mutations affect P element-yellow gene interactions.

Main Methods:

• Analysis of two independent P element-induced yellow mutations (y76d28 and y1#7).
• Examination of P element insertion sites and transcriptional orientation relative to the yellow gene.
• Splicing analysis of P element-yellow transcripts in wild-type and su(s) mutant flies.
• cDNA analysis to assess splice junction selection.

Main Results:

• The y1#7 mutation, with P element in the same orientation as yellow, was not suppressed by su(s) mutations.
• The y76d28 mutation, with P element in the opposite orientation, showed increased precursor and mature yellow transcripts in su(s) mutants.
• Splicing efficiency and splice junction selection remained unchanged in su(s) mutant backgrounds.
• Levels of both precursor P element-yellow RNA and the functional yellow transcript increased in su(s) mutant flies.

Conclusions:

• Suppressor of sable [su(s)] mutations do not appear to influence the efficiency of P element sequence splicing.
• The su(s) protein's function is proposed to involve the regulation of unprocessed RNA stability during the splicing process.
• These findings provide insight into the regulatory mechanisms of gene expression involving transposable elements and RNA processing.