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Analysis of Transforming Growth Factor ß Family Cleavage Products Secreted Into the Blastocoele of Xenopus laevis Embryos

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Published on: July 21, 2021

An evolutionarily conserved enhancer regulates Bmp4 expression in developing incisor and limb bud.

Dolrudee Jumlongras¹, Salil A Lachke, Daniel J O'Connell

¹Division of Genetics, Department of Medicine, Harvard Medical School, Brigham and Women's Hospital, Boston Massachusetts, United States of America.

|June 16, 2012

Summary

Researchers identified a key regulatory region in the Bmp4 gene, revealing a direct link between Pitx homeoproteins and Bmp4 expression during tooth and limb development.

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Area of Science:

Developmental Biology
Molecular Genetics
Genomics

Background:

Bmp4 (Bone Morphogenetic Protein 4) plays crucial roles in embryonic development.
Understanding the transcriptional regulation of Bmp4 is essential for elucidating organogenesis processes.

Purpose of the Study:

To identify and characterize cis-regulatory modules (CRMs) controlling Bmp4 expression during organogenesis.
To investigate the role of Pitx homeoproteins in Bmp4 transcriptional regulation.

Main Methods:

Phylogenetic footprinting and transgenic reporter analyses to identify Bmp4 CRMs.
Transcript profiling, protein binding microarray (PBM), electrophoretic mobility shift assays (EMSA), and chromatin immunoprecipitation (ChIP) to study gene regulation.
In vivo mutational analyses in transgenic reporter systems.

Main Results:

A 396-bp minimal enhancer region approximately 46 kb upstream of the mouse Bmp4 gene was identified.
This enhancer directs Bmp4 expression in developing mandibular arch, incisor epithelium, and limb structures (apical ectodermal ridge, mesenchyme).
A conserved Pitx homeoprotein binding motif was identified within the Bmp4 enhancer, crucial for recapitulating Bmp4 expression patterns.

Conclusions:

A direct molecular regulatory link between Pitx family members and Bmp4 gene expression in developing incisor epithelium is established.
Pitx2 directly binds to the identified Bmp4 enhancer site, confirming its regulatory role.
These findings provide insights into the transcriptional control of Bmp4 during craniofacial and limb development.