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Updated: Jul 19, 2026
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Isolation and Derivation of Mouse Embryonic Germinal Cells
Published on: October 22, 2009
Requirement of CDC45 for postimplantation mouse development
1Department of Pathology, Brigham and Women's Hospital and Harvard Medical School, Boston, Massachusetts, USA.
Molecular and Cellular Biology
|June 21, 2001
Summary
CDC45 is essential for mammalian development, as its absence impairs inner cell mass proliferation and subsequent embryonic growth. Heterozygous mice show no abnormalities, suggesting CDC45 hemizygosity alone doesn't cause DiGeorge syndrome defects.
Area of Science:
- Molecular Biology
- Developmental Biology
- Genetics
Background:
- CDC45 is a known DNA replication factor in yeast and frogs, but its function in mammals was unclear.
- Its role is critical for DNA replication initiation and polymerase alpha loading.
Purpose of the Study:
- To investigate the genetic and physiological functions of CDC45 in mammalian development.
- To determine if CDC45 is essential for embryonic development and its potential link to DiGeorge syndrome.
Main Methods:
- Gene targeting was used to create mice lacking a functional CDC45 gene (homozygous mutants).
- CDC45 null embryos were analyzed in vitro for proliferation defects.
- Heterozygous mutant mice were assessed for developmental abnormalities.
Main Results:
- Homozygous CDC45 mutant mice showed impaired inner cell mass proliferation and failed to develop substantially post-implantation.
- CDC45 is experimentally proven to be essential for mammalian development.
- Heterozygous CDC45 mutant mice developed normally, indicating hemizygosity alone is unlikely to cause DiGeorge syndrome phenotypes.
Conclusions:
- CDC45 is indispensable for early mammalian embryonic development.
- The essential role of CDC45 in development is established.
- CDC45 hemizygosity is unlikely to be the sole cause of cardiac and craniofacial defects in DiGeorge syndrome.
