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DNA polymerase activities in human placenta.

A Ishii1, H Hamada, M Takayanagi

  • 1Department of Obstetrics and Gynecology, St. Marianna University, Kanagawa, Japan.

Archives of Gynecology and Obstetrics
|January 1, 1987
PubMed
Summary
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DNA polymerase alpha activity in human placenta is highest during early pregnancy, potentially linked to placental formation. DNA polymerase beta activity remains stable throughout gestation.

Area of Science:

  • Biochemistry
  • Molecular Biology
  • Human Physiology

Background:

  • DNA polymerases are crucial enzymes for DNA replication and repair.
  • Human placental development involves rapid cell division and requires significant DNA synthesis.

Purpose of the Study:

  • To investigate the activity levels of DNA polymerase alpha and beta in human placenta during different stages of pregnancy.
  • To explore potential correlations between polymerase activity and placental development.

Main Methods:

  • Assaying DNA polymerase alpha and beta activity in crude extracts from human placental tissues.
  • Comparing enzyme activity across various gestational weeks.

Main Results:

  • DNA polymerase alpha activity showed a significant increase in early pregnancy, declining in the second trimester.

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  • DNA polymerase beta activity exhibited no significant changes with gestational progression.
  • Early pregnancy elevation of polymerase alpha may relate to mitotic activity during placental formation.

    • Conclusions:

    • DNA polymerase alpha activity fluctuates during human pregnancy, correlating with early placental development.
    • The findings suggest a potential role for an accelerating factor in early pregnancy polymerase activity.
    • DNA polymerase beta activity appears independent of gestational stage in the placenta.