A pathway for mitotic chromosome formation.
Science
; 359(6376)2018 02 09.
Article
em En
| MEDLINE
| ID: mdl-29348367
ABSTRACT
Mitotic chromosomes fold as compact arrays of chromatin loops. To identify the pathway of mitotic chromosome formation, we combined imaging and Hi-C analysis of synchronous DT40 cell cultures with polymer simulations. Here we show that in prophase, the interphase organization is rapidly lost in a condensin-dependent manner, and arrays of consecutive 60-kilobase (kb) loops are formed. During prometaphase, ~80-kb inner loops are nested within ~400-kb outer loops. The loop array acquires a helical arrangement with consecutive loops emanating from a central "spiral staircase" condensin scaffold. The size of helical turns progressively increases to ~12 megabases during prometaphase. Acute depletion of condensin I or II shows that nested loops form by differential action of the two condensins, whereas condensin II is required for helical winding.
Texto completo:
1
Base de dados:
MEDLINE
Assunto principal:
Cromossomos
/
Mitose
Limite:
Animals
Idioma:
En
Ano de publicação:
2018
Tipo de documento:
Article