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Related Experiment Video

Updated: May 26, 2026

HOX Loci Focused CRISPR/sgRNA Library Screening Identifying Critical CTCF Boundaries

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Published on: March 31, 2019

Variable motif utilization in homeotic selector (Hox)-cofactor complex formation controls specificity.

Katherine M Lelli¹, Barbara Noro, Richard S Mann

¹Department of Genetics and Development, Columbia University Medical Center, New York, NY 10032, USA.

Proceedings of the National Academy of Sciences of the United States of America

|December 14, 2011

Summary

This summary is machine-generated.

Homeotic selector (Hox) proteins use different DNA-binding mechanisms with cofactors like Extradenticle (Exd) to control gene activity. This study reveals how Sex combs reduced (Scr), Abdominal-A (AbdA), and Ultrabithorax (Ubx) proteins achieve specificity through distinct motif interactions.

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Area of Science:

Developmental biology
Genetics
Molecular biology

Background:

Homeotic selector (Hox) proteins are crucial transcription factors regulating animal development.
Hox proteins often function with cofactors, such as Extradenticle (Exd), to bind DNA and achieve target gene specificity.
The YPWM motif in Hox proteins has been identified as a key interaction site for Exd.

Purpose of the Study:

To comparatively analyze the roles of conserved sequence motifs in the DNA-binding and in vivo functions of three Drosophila Hox proteins: Sex combs reduced (Scr), Abdominal-A (AbdA), and Ultrabithorax (Ubx).
To elucidate how different Hox proteins utilize interaction motifs with cofactors like Exd to achieve functional specificity.

Main Methods:

Comparative analysis of conserved sequence motifs across different Hox proteins.
Investigation of motif contributions to Exd-dependent DNA-binding.
Assessment of in vivo functions of Hox proteins and their motifs in regulating specific target genes in Drosophila.

Main Results:

Sex combs reduced (Scr) utilizes a simple mechanism involving a single tryptophan-containing motif essential for Exd-dependent DNA binding and function.
Abdominal-A (AbdA) employs a more complex strategy, using multiple conserved motifs in a context-dependent manner.
Ultrabithorax (Ubx) exhibits the highest flexibility, employing multiple conserved motifs in parallel to regulate target genes.

Conclusions:

Hox proteins display diverse strategies in their interactions with cofactors like Exd to achieve functional specificity.
The differential utilization of conserved motifs provides a mechanism for Hox proteins to regulate distinct sets of target genes.
These findings offer insights into the evolution and diversification of Hox protein functions in development.