Dynamic chromatin conformation and accessibility changes mediate the spatial-specific gene regulatory network in...

Area of Science:

• Molecular Biology
• Genetics
• Biochemistry

Background:

• Silk gland gene expression in Bombyx mori exhibits spatial specificity, influencing silk quality.
• Current understanding of these spatial gene regulation mechanisms is limited.

Purpose of the Study:

• To investigate the regulatory mechanisms behind spatial gene expression in silkworm silk glands.
• To identify key factors controlling spatial gene expression in the middle silk gland (MSG) and posterior silk gland (PSG).

Main Methods:

• Gene ontology annotation
• Hi-C for chromatin conformation analysis
• FAIRE-seq for chromatin accessibility
• Identification of transcription factor motifs

Main Results:

• Spatially specific genes are linked to H3k9me and chromatin topology.
• Significant differences in topologically associated domain boundaries were observed between MSG and PSG.
• POU-M2, a homeobox transcription factor, was identified as a key regulator in MSG, controlling spatial-specific gene expression.

Conclusions:

• Chromatin conformation changes impact gene activity and expression in silkworms.
• POU-M2 plays a crucial role in regulating spatial-specific gene expression in the MSG.
• Findings can enhance silk performance, silkworm breeding, and insect gene regulation models.