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Chromosomal mapping and nucleotide sequence of a human DNA autonomously replicating sequence
M Aguinaga1, C Sharan, D N Singh
1Division of Biomedical Sciences, Meharry Medical College, Nashville, Tennessee 37208.
Genomics
|October 1, 1989
Summary
A human DNA fragment, ARSH1, functions as a replication origin in yeast. It localizes to specific human chromosome regions and may anchor chromosomes to the nuclear matrix.
Area of Science:
- Molecular Biology
- Human Genetics
- Yeast Genetics
Background:
- Origins of replication are crucial for DNA duplication.
- Understanding human replication origins can elucidate genome stability.
- The ARS consensus sequence is vital for replication initiation in yeast.
Purpose of the Study:
- To characterize a human DNA fragment (ARSH1) with potential replication origin function.
- To determine the chromosomal localization of ARSH1.
- To investigate the sequence features of ARSH1, including nuclear matrix association motifs.
Main Methods:
- In situ hybridization to human metaphase chromosomes.
- DNA sequencing of the 1.1-kb ARSH1 fragment.
- Bioinformatic analysis for identifying DNA motifs.
Main Results:
- ARSH1 functions as a putative replication origin in yeast.
- ARSH1 preferentially localizes to human chromosome regions 1p34-36 and 2q34-37.
- ARSH1 contains both the yeast ARS consensus sequence and nuclear matrix-associated DNA motifs.
Conclusions:
- ARSH1 represents a functional human replication origin.
- ARSH1's localization suggests a role in organizing specific chromosome regions.
- The presence of nuclear matrix-associated motifs indicates ARSH1 may anchor chromosomes 1 and 2 to the nuclear matrix.