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- W2007002152 abstract "Our understanding of the structure and function of mitotic chromosomes has come a long way since these iconic objects were first recognized more than 140 years ago, though many details remain to be elucidated. In this chapter, we start with the early history of chromosome studies and then describe the path that led to our current understanding of the formation and structure of mitotic chromosomes. We also discuss some of the remaining questions. It is now well established that each mitotic chromatid consists of a central organizing region containing a so-called “chromosome scaffold” from which loops of DNA project radially. Only a few key non-histone proteins and protein complexes are required to form the chromosome: topoisomerase IIα, cohesin, condensin I and condensin II, and the chromokinesin KIF4A. These proteins are concentrated along the axis of the chromatid. Condensins I and II are primarily responsible for shaping the chromosome and the scaffold, and they produce the loops of DNA by an ATP-dependent process known as loop extrusion. Modelling of Hi-C data suggests that condensin II adopts a spiral staircase arrangement with an extruded loop extending out from each step in a roughly helical pattern. Condensin I then forms loops nested within these larger condensin II loops, thereby giving rise to the final compaction of the mitotic chromosome in a process that requires Topo IIα." @default.
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- W2007002152 date "2005-05-01" @default.
- W2007002152 modified "2023-10-16" @default.
- W2007002152 title "Deleción terminal del brazo largo de uno de los cromosomas del par 20 (46, XY, del [20] [q11.2] [15]/46, XY) y leucemia aguda híbrida en un paciente con anemia aplástica de Fanconi" @default.
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- W2007002152 doi "https://doi.org/10.1157/13075580" @default.
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