Nanos is the localized posterior determinant in Drosophila

Area of Science:

• Developmental biology
• Genetics
• Molecular biology

Background:

• Drosophila melanogaster embryonic development relies on maternal factors for establishing segmental patterns.
• Two key maternal factors are localized to the anterior and posterior poles of the egg.

Purpose of the Study:

• To provide molecular evidence identifying the posterior maternal factor.
• To investigate the role of the nanos (nos) gene in Drosophila embryonic segmentation.

Main Methods:

• Localization of nanos (nos) RNA to the posterior pole of early embryos.
• Assessing the biological activity of synthetic nos RNA.
• Rescue experiments using nos RNA injection in mutant Drosophila embryos.

Main Results:

• nos RNA is localized to the posterior pole and its protein product directs abdomen formation.
• Synthetic nos RNA rescues segmentation defects in embryos lacking posterior group genes.
• Injection of nos RNA can induce ectopic posterior structures.

Conclusions:

• A localized source of nanos (nos) RNA is sufficient for specifying abdominal segmentation in Drosophila embryos.
• Other posterior group genes are likely involved in the localization, stabilization, or distribution of the nanos gene product.