Abstract：
:In mice, the first round of DNA replication occurs in fertilized eggs (1-cell embryos), while the onset of zygotic gene transcription begins approximately 20 hours after fertilization, a time that normally coincides with formation of a 2-cell embryo. One approach to investigating the mechanisms that control these developmentally regulated events has been to microinject plasmid DNA into the nuclei of mouse oocytes and embryos in order to determine the requirements for unique DNA sequences that regulate transcription and replication. The results from these and other studies have revealed two important mechanisms that regulate the beginning of animal development. The first is a time dependent "zygotic clock" of unknown detail that delays the onset of transcription, regardless of whether or not a 2-cell embryo is formed. The second is a mechanism that represses the activity of promoters and origins of replication specifically in maternal pronuclei of oocytes and 1-cell embryos, and in all nuclei of 2-cell embryos, regardless of their parental origin or ploidy. This repression is linked to chromatin, but the striking ability to relieve this repression with specific embryo-responsive enhancers first appears with formation of a 2-cell embryo. The need for a TATA-box to mediate enhancer stimulation of promoter activity appears even later when cell differentiation becomes evident. Thus, a biological clock delays transcription until both paternal and maternal genomes are replicated and remodeled from a post-meiotic state to one in which transcription is repressed by chromatin structure in a manner that can be relieved by cell-specific enhancers at appropriate times during development.
journal_name
J Cell Biochemjournal_title
Journal of cellular biochemistryauthors
Majumder S,DePamphilis MLdoi
10.1002/jcb.240550107subject
Has Abstractpub_date
1994-05-01 00:00:00pages
59-68issue
1eissn
0730-2312issn
1097-4644journal_volume
55pub_type
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