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Mouse oocytes and early embryos express multiple histone H1 subtypes.
Germaine Fu1, Parinaz Ghadam, Allen Sirotkin
1Department of Obstetrics and Gynecology, McGill University, Montréal, Québec, Canada.
Biology of Reproduction
|February 28, 2003
Summary
Histone H10 is present in mouse oocytes and early embryos, alongside changes in somatic H1 subtype synthesis during development. This reveals a dynamic linker histone composition crucial for early embryonic gene expression.
Area of Science:
- Reproductive Biology
- Developmental Biology
- Epigenetics
Background:
- Mammalian oocytes and early embryos possess a unique linker histone, H1oo.
- The presence and role of other H1 histone subtypes in these cells remain unclear.
Purpose of the Study:
- To investigate the presence and contribution of histone H10 and somatic H1 subtypes in mouse oocytes and early embryos.
- To understand the dynamic changes in linker histone composition during early development.
Main Methods:
- Immunofluorescence and radiolabeling techniques were employed.
- Polymerase chain reaction was used to analyze mRNA.
- Antibodies against histone H10 and H10 knockout mice were utilized.
Main Results:
- Histone H10 mRNA is present in oocytes and embryos, with H10 protein detected in oocytes and early embryos (up to the four-cell stage).
- Synthesis of somatic H1 subtypes H1a and H1c occurs in oocytes and one- to two-cell embryos.
- Beginning at the four-cell stage, synthesis of H1b, H1d, and H1e subtypes is additionally observed.
Conclusions:
- Histone H10 is a component of the linker histone complement in oocytes and early embryos.
- Significant changes in somatic H1 subtype synthesis occur during early embryonic development.
- The dynamic H1 histone composition likely plays a role in establishing regulated embryonic gene expression.