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MCM4 and PRKDC, human genes encoding proteins MCM4 and DNA-PKcs, are close neighbours located on chromosome
E M Ladenburger1, F O Fackelmayer, H Hameister
1Division of Biology, Universität Konstanz, Germany.
Abstract:
A human genomic DNA fragment containing the 5' region of MCM4, a gene encoding replication protein MCM4/Cdc21 was isolated. At a distance of about 800 base pairs upstream of MCM4, the fragment was shown to also contain the 5' end of PRKDC, a gene encoding the catalytic subunit of the DNA-dependent protein kinase (DNA-PKcs). The genomic DNA fragment was used for hybridization to human metaphase chromosome spreads. The cytogenetic map location of the two closely adjacent genes was determined to be 8q12-->q13.
Insights
Researchers isolated a human DNA fragment containing the 5' regions of the MCM4 and DNA-dependent protein kinase catalytic subunit (PRKDC) genes. This fragment helped determine the precise cytogenetic location of these two adjacent genes on human chromosome 8.
Area of Science:
- Human Molecular Genetics
- Cytogenetics
- Gene Mapping
Background:
- The MCM4 gene encodes replication protein MCM4/Cdc21, crucial for DNA replication.
- The PRKDC gene encodes the catalytic subunit of DNA-dependent protein kinase (DNA-PKcs), vital for DNA repair.
- Understanding the genomic organization and location of genes is fundamental for genetic studies and disease research.
Purpose of the Study:
- To isolate and characterize a human genomic DNA fragment containing the 5' regions of the MCM4 and PRKDC genes.
- To determine the cytogenetic map location of the MCM4 and PRKDC genes.
- To investigate the physical proximity of the MCM4 and PRKDC genes on the human genome.
Main Methods:
- Isolation of a human genomic DNA fragment containing the 5' regions of MCM4 and PRKDC.
- Hybridization of the isolated DNA fragment to human metaphase chromosome spreads.
- Cytogenetic analysis to determine gene mapping.
Main Results:
- A human genomic DNA fragment was successfully isolated, containing the 5' region of the MCM4 gene.
- This fragment also contained the 5' end of the PRKDC gene, located approximately 800 base pairs upstream of MCM4.
- The cytogenetic map location for both closely adjacent genes (MCM4 and PRKDC) was determined to be 8q12-->q13.
Conclusions:
- The MCM4 and PRKDC genes are located in close proximity on human chromosome 8q12-->q13.
- The isolated genomic DNA fragment provides a valuable tool for further genetic and physical mapping studies.
- This precise gene localization is essential for understanding their potential coordinated regulation and roles in cellular processes.