Helical chromonema coiling is conserved in eukaryotes.
Plant J
; 2023 Oct 16.
Article
em En
| MEDLINE
| ID: mdl-37840457
ABSTRACT
Efficient chromatin condensation is required to transport chromosomes during mitosis and meiosis, forming daughter cells. While it is well accepted that these processes follow fundamental rules, there has been a controversial debate for more than 140 years on whether the higher-order chromatin organization in chromosomes is evolutionarily conserved. Here, we summarize historical and recent investigations based on classical and modern methods. In particular, classical light microscopy observations based on living, fixed, and treated chromosomes covering a wide range of plant and animal species, and even in single-cell eukaryotes suggest that the chromatids of large chromosomes are formed by a coiled chromatin thread, named the chromonema. More recently, these findings were confirmed by electron and super-resolution microscopy, oligo-FISH, molecular interaction data, and polymer simulation. Altogether, we describe common and divergent features of coiled chromonemata in different species. We hypothesize that chromonema coiling in large chromosomes is a fundamental feature established early during the evolution of eukaryotes to handle increasing genome sizes.
Hordeum vulgare; chromatid; chromatin condensation; chromonema; chromosome conformation capture sequencing (Hi-C); helical chromatid structure; metaphase chromosome; oligo-fluorescence in situ hybridization (oligo-FISH); polymer simulation; sister chromatid exchange (SCE); structured illumination microscopy (SIM)
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Base de dados:
MEDLINE
Idioma:
En
Ano de publicação:
2023
Tipo de documento:
Article