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Eukaryotic Transcription Inhibitors

Eukaryotic Transcription Inhibitors

Certain biochemical processes, such as embryonic development and cell growth regulation, depend on the repression of specific genes. DNA binding proteins known as eukaryotic transcription inhibitors regulate the repression of gene expression in eukaryotes. The presence of these inhibitors at the required location and time in the cell is triggered by the presence of hormones and additional signals from other cells.
Eukaryotic transcription inhibitors usually contain two distinct domains, a...

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Zebrafish Whole Mount High-Resolution Double Fluorescent In Situ Hybridization

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Published on: March 25, 2009

DND protein functions as a translation repressor during zebrafish embryogenesis.

Manami Kobayashi¹, Saori Tani-Matsuhana², Yasuka Ohkawa¹

¹Department of Biology, Graduate School of Science, Kobe University, Kobe 657-8501, Japan.

Biochemical and Biophysical Research Communications

|January 25, 2017

Summary

DND protein, a germ cell regulator, represses translation of specific mRNAs like nanog and dnd. This function is crucial for primordial germ cell (PGC) development in zebrafish, distinct from its role in germ plasm mRNA regulation.

Keywords:

Dead-end (DND)Primordial germ cell (PGC)Translation repression Zebrafish

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Area of Science:

Developmental biology
Molecular genetics
Zebrafish models

Background:

Germline and somatic cell differentiation relies on microRNAs and germ cell-specific RNA-binding proteins.
DND protein was previously thought to counteract miR-430 repression of germ plasm mRNAs in primordial germ cells (PGCs).

Purpose of the Study:

To investigate the role of DND protein in regulating mRNA translation in zebrafish.
To determine if DND overexpression counteracts miR-430 repression in somatic cells.
To elucidate the mechanism by which DND influences PGC development.

Main Methods:

λN-box B tethering assay in zebrafish embryos.
Overexpression studies of DND protein in somatic cells.
Analysis of mRNA translation and stability.

Main Results:

DND overexpression did not counteract miR-430-mediated repression in somatic cells.
Tethering DND to reporter mRNA caused translation repression, independent of mRNA stability.
DND-mediated translation repression was not dependent on Nanos3.
DND represses translation of nanog and dnd mRNAs, while DAZL promotes dnd mRNA translation.

Conclusions:

DND protein functions as a translation repressor for specific mRNAs, including nanog and dnd.
This translation repression activity of DND is critical for controlling primordial germ cell development in zebrafish.
DND's role extends beyond relieving repression to actively repressing translation of key developmental genes.