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Early C. elegans embryos are transcriptionally active.

I E Schauer¹, W B Wood

¹Department of Molecular, Cellular and Developmental Biology, University of Colorado, Boulder 80309.

Development (Cambridge, England)

|December 1, 1990

Summary

We developed a new assay to study early transcription in C. elegans embryos. This method reveals that most genes are transcribed early, with a small set of unique early genes identified.

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Area of Science:

Developmental Biology
Molecular Biology
Genetics

Background:

Understanding early gene expression is crucial for deciphering embryonic development.
Characterizing transcription in early embryos presents technical challenges.

Purpose of the Study:

To develop and validate a nucleotide incorporation assay for analyzing run-on transcription in C. elegans embryonic extracts.
To characterize the patterns and regulation of early transcription during C. elegans embryogenesis.

Main Methods:

Developed a nucleotide incorporation assay using C. elegans embryonic extracts to measure RNA synthesis.
Utilized polymerase II-catalyzed RNA synthesis and assessed transcript size and processing.
Employed hybridization techniques to compare in vitro transcripts with in vivo transcription patterns across embryonic stages.

Main Results:

The assay primarily measures elongation of pre-initiated RNA chains, reflecting in vivo transcription.
Transcription is active in pregastrulation embryos, with relatively constant transcription levels per nucleus throughout development.
Most genes are transcribed by the pregastrulation stage, with a small set of sequences showing preferential transcription early on.

Conclusions:

The developed assay accurately reflects developmentally regulated transcription.
Early C. elegans embryos exhibit widespread gene transcription, with a potentially novel class of genes crucial for early development.
This work provides insights into the temporal regulation of gene expression during early embryogenesis.

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