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Nucleoli in a pronuclei-stage mouse embryo are represented by major satellite DNA of interconnecting chromosomes
D Dozortsev1, A Coleman, P Nagy
1Department of Obstetrics and Gynecology, Wayne State University, Detroit, Michigan, USA. aa4421@wayne.edu
Objective:
To investigate the arrangement of chromosomes within pronuclei-stage mouse zygotes.
Design:
In vitro study.
Setting:
Academic medical center.
Patient(S):
None.
Intervention(S):
None.
Main Outcome Measure(S):
Location of major alpha-satellite DNA, centromeres, and telomeres, and relative location of chromosomes.
Result(S):
Chromosomes appeared to be oriented inward by centromeres and to be interconnected by major alpha-satellite DNA, which appeared to be the sole DNA component of the nucleoli. This chromosomal arrangement persisted throughout interphase. Chromosomal painting failed to identify chromosomal ordering within pronuclei.
Conclusion(S):
Pronuclear nucleoli are represented by alpha-satellite sequences of interconnecting chromosomes that hold all chromosomes together during interphase. Chromosomes within the pronucleus are randomly positioned relative to each other.