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A Developmental Program Truncates Long Transcripts to Temporally Regulate Cell Signaling.

Jeremy E Sandler¹, Jihyun Irizarry¹, Vincent Stepanik¹

¹Division of Biology and Biological Engineering, California Institute of Technology, Pasadena, CA 91125, USA.

Developmental Cell

|December 19, 2018

Summary

This summary is machine-generated.

Early Drosophila embryos produce short transcripts from long genes, regulated by Sex-lethal protein, to control developmental timing and minimize cell signaling.

Keywords:

Drosophila melanogaster Sex-lethal TGF-ß signaling cell signaling cellularization embryo gene expression short nuclear cycles short-gastrulation truncated transcripts

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Area of Science:

Developmental Biology
Molecular Genetics
RNA Biology

Background:

Rapid early embryonic cell cycles in Drosophila limit transcript elongation.
Previous research indicated transcription initiation but abortion of long genes.
Short interphases of nuclear divisions pose challenges for full transcript synthesis.

Purpose of the Study:

To identify and characterize truncated transcripts from long genes in early Drosophila embryos.
To investigate the role of the RNA binding protein Sex-lethal in transcript termination.
To understand the functional significance of truncated transcripts in embryonic development.

Main Methods:

Identification of truncated transcripts from long genes expressed during short nuclear cycles.
Analysis of Sex-lethal protein association with these transcripts.
Functional characterization of truncated transcripts, including the short-gastrulation gene product.

Main Results:

Long genes expressed during rapid divisions yield truncated transcripts.
Sex-lethal protein is essential for early transcript termination, producing shorter isoforms.
A truncated short-gastrulation transcript product modulates TGF-β signaling.

Conclusions:

A developmental program utilizes short transcripts to regulate Drosophila embryogenesis timing.
Truncated transcripts minimize early cell signaling, facilitating proper initiation at cellularization.
This mechanism ensures precise temporal control over early embryonic development.