Transposable elements as scaffold/matrix attachment regions: shaping organization and functions in genomes

Area of Science:

• Genomics
• Epigenetics
• Molecular Biology

Background:

• Eukaryotic genomes possess regulatory layers, including epigenetic indexing for cell-type-specific gene expression.
• Scaffold/matrix attachment regions (S/MARs) establish structural and functional loops, defining chromatin domains and enabling coordinated control over genomic segments.
• Topologically associating domains (TADs) delineate self-interacting genomic regions, contributing to genome organization.

Purpose of the Study:

• To investigate the link between transposable elements (TEs) and S/MARs in genome organization and evolution.
• To understand how TE-driven dispersal of S/MARs influences chromosomal structure, including the formation of novel loops and domains.
• To highlight the potential of the TE-S/MAR combination as a mechanism for genome evolution.

Main Methods:

• Genome-wide mapping of S/MARs.
• Analysis of the association between S/MARs and transposable elements (TEs).

Main Results:

• A significant fraction of S/MARs are associated with TEs.
• TEs may serve as anchorage sites for chromatin loops within the nuclear architecture.
• TE-driven dispersal of S/MARs can lead to the restructuring of chromosomes, creating new loops and domains.

Conclusions:

• The combination of TEs and S/MARs offers a dynamic mechanism for genome evolution.
• This partnership between TEs and S/MARs can drive the emergence of novel biological features through chromosomal restructuring.
• Understanding the interplay between TEs and S/MARs is crucial for comprehending genome shaping and evolutionary processes.