Jul 1, 1976

Multiple forms of DNA-dependent DNA polymerase during early development and in somatic cells of Xenopus laevis

Cell Differentiation
P GrippoT Labella


Four distinct DNA-dependent DNA polymerase activities (DNA polymerases I, II, III and IV according to the order of elution from a DEAE column) have been separated from extracts of unfertilized Xenopus laevis eggs. The same activities, on the basis of their chromatographic properties, template specificities and sedimentation coefficients, have been found in embryos at least until the gastrula stage. On the other hand, Xenopus kidney cells grown in culture, as well as full grown oocytes lack DNA polymerase I. These data suggest the DNA polymerase I might be a special DNA polymerase activity involved in the extremely rapid DNA synthesis which takes place during early development of X. laevis.

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Mentioned in this Paper

Deoxyribonucleic Polymerase I Activity
DNA Polymerase I
DNA Polymerase Activity
Embryonic Structures, Nonmammalian
Sedimentation Procedure
DNA Biosynthetic Process

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