Human-mouse genome comparisons to locate regulatory sites

Area of Science:

• Genomics and Bioinformatics
• Molecular Biology
• Systems Biology

Background:

• Understanding the human transcriptional regulatory network is a key challenge in the post-genomic era.
• Current methods allow detailed study of regulatory mechanisms for some genes, DNA localization via cross-species comparison, and transcription factor binding specificity determination.

Purpose of the Study:

• To address challenges in extending findings from model organisms to the human genome.
• To determine the number of model organism genomes needed to identify most human regulatory regions.
• To generalize the discovery of transcription factor binding sites from single-celled to multicellular organisms.

Main Methods:

• Analysis of sequence conservation between human and rodent genomes.
• Focusing on highly conserved regions to identify regulatory elements.
• Computational identification of transcription factor binding specificities.

Main Results:

• 98% of experimentally defined skeletal-muscle-specific transcription factor binding sites are located within the 19% most conserved human DNA sequences compared to rodents.
• This conservation-based restriction enabled the computational identification of binding specificities for major muscle-specific transcription factors (MYF, SRF, MEF2).

Conclusions:

• Cross-species sequence conservation is a powerful tool for localizing human regulatory regions.
• This approach facilitates the discovery of transcription factor binding sites in multicellular organisms, advancing the study of transcriptional regulation.