Organization and dynamics of plant interphase chromosomes

Area of Science:

• Plant Biology
• Cell Biology
• Genetics

Background:

• Eukaryotic chromosomes occupy distinct territories within interphase nuclei.
• Chromosome territory (CT) arrangement is crucial for essential nuclear processes like replication, transcription, repair, and recombination.
• Current understanding of interphase chromatin arrangement primarily relies on in situ labeling techniques.

Purpose of the Study:

• To review current data on the relative positioning of chromosome territories (CTs), somatic homologous pairing, and sister chromatid alignment.
• To explore factors influencing interphase nuclear architecture, including phylogenetic affiliation, cell cycle, differentiation, and environmental conditions.
• To discuss the morphological constraints, epigenetic impacts, evolutionary stability, and dynamic alterations of nuclear architecture.

Main Methods:

• Survey of existing data on chromosome territory arrangement.
• Analysis of studies primarily from Arabidopsis thaliana, wheat (Triticum aestivum), and related species.
• In situ labeling approaches as a basis for current knowledge.

Main Results:

• Interphase nuclear architecture is influenced by species, cell cycle, differentiation, and environmental factors.
• Relative positioning of CTs, somatic pairing, and sister chromatid alignment vary across different cell types and tissues.
• Morphological and epigenetic factors significantly impact nuclear organization, with implications for evolutionary stability and dynamic changes during cellular processes.

Conclusions:

• Nuclear architecture, including chromosome territory arrangement, is a dynamic and regulated process.
• Understanding CT positioning provides insights into genome function, evolution, and response to cellular demands.
• Further research is needed to fully elucidate the complex interplay of factors governing nuclear organization in plants.