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Analysis of chromatin proteins from human placenta
R S Corfman1, G R Reeck, A S Cook
1Department of Obstetrics and Gynecology, Wesley Medical Center, University of Kansas School of Medicine, Wichita 67214.
Placenta
|September 1, 1987
Summary
Human placenta contains High Mobility Group (HMG) proteins, including a novel HMG-PL protein. HMG-PL levels increase with gestational age, suggesting its role in late-term placental development.
Area of Science:
- Biochemistry
- Molecular Biology
- Human Placental Biology
Background:
- High Mobility Group (HMG) proteins are crucial for chromatin structure and function.
- Previous research has characterized HMG proteins in various tissues, but their presence and specific roles in the human placenta are not fully understood.
Purpose of the Study:
- To identify and characterize High Mobility Group (HMG) proteins in human term placenta.
- To investigate the expression patterns of HMG proteins during different stages of gestation.
Main Methods:
- Chromatin extraction from human term placenta.
- Analysis of HMG proteins using salt-dissociation characteristics, trichloroacetic acid solubility, SDS-PAGE, and NEPHGE.
- Amino acid analysis of purified HMG-PL.
Main Results:
- All known HMG proteins (HMG-1, -2, -E, -14, -17) were detected in human term placenta.
- A novel HMG protein, designated HMG-PL, was identified.
- HMG-E was present in large quantities and its levels remained constant relative to HMG-1 and -2 throughout gestation (20-40 weeks).
- HMG-PL expression increased significantly after 34 weeks of gestation.
- Amino acid analysis indicated HMG-PL belongs to the HMG-1 protein family.
Conclusions:
- Human term placenta expresses a diverse array of HMG proteins, including a novel HMG-PL.
- HMG-PL exhibits differential expression during late gestation, suggesting a specific role in advanced placental development.
- The findings contribute to understanding the molecular composition and developmental regulation of chromatin in the human placenta.