Genome-Wide Mapping of Collier In Vivo Binding Sites Highlights Its Hierarchical Position in Different Transcription...

Area of Science:

• Developmental Biology
• Genetics
• Molecular Biology

Background:

• The Drosophila transcription factor Collier (Col) is crucial for embryonic development, including head patterning and cell identity specification.
• Understanding direct Col targets is key to elucidating its regulatory mechanisms in different cell types.

Purpose of the Study:

• To identify direct Collier (Col) target genes genome-wide using ChIP-seq.
• To investigate the role of Col in specifying muscle and neuronal identities during embryogenesis.

Main Methods:

• Chromatin immunoprecipitation followed by sequencing (ChIP-seq) to map Col binding sites.
• Gene Ontology analysis to identify functions of target genes.
• Transgenic reporter assays to validate direct Col targets and regulatory interactions.

Main Results:

• ChIP-seq identified 415 potential direct Col target genes.
• Target genes are enriched for DNA binding and transcription regulatory functions.
• Direct Col targets were confirmed in somatic muscles and central nervous system neurons.
• Col regulates apterous and eyes absent (eya) for neuronal identity and muscle progenitor specification.

Conclusions:

• Col directly controls key transcription regulators, including apterous and eyes-absent (eya), essential for neuronal and muscle identity.
• Cross-regulation between Col and eya in muscle progenitors highlights conserved myogenic regulatory networks.
• Col's regulation of eya in distinct lineages may explain its diverse biological roles and evolutionary diversification.