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. 1994 Sep;14(9):5628–5635. doi: 10.1128/mcb.14.9.5628

A mammalian origin of bidirectional DNA replication within the Chinese hamster RPS14 locus.

E S Tasheva 1, D J Roufa 1
PMCID: PMC359087  PMID: 8065299

Abstract

Two complementary experimental approaches have been used to identify a chromosomal origin of bidirectional DNA replication within or immediately downstream of the Chinese hamster ribosomal protein S14 gene (RPS14). The replication origin, designated oriS14, maps within a 1.6- to 2.0-kbp region of RPS14 that includes the gene's third and fourth introns, exons IV plus V, and approximately 500 bp of proximal downstream flanking DNA. The nucleic acid sequence encoding oriS14 closely resembles the other mammalian chromosomal replication origins whose primary structures are known. It contains DNA binding sites for a large number of transcription factors, replication proteins, and mammalian oncogenes as well as several dinucleotide repeat motifs, an AT-rich region, and a sequence that is likely to bend the DNA. In contrast to the other well-characterized mammalian replication origins, which are autosomal and therefore carried as two copies per somatic cell, oriS14 is encoded by single-copy DNA within a hemizygous segment of chromosome 2q in CHO-K1 cells. Also, other known mammalian replication origins are situated in nontranscribed, intergenic DNA, whereas the DNA sequence encoding oriS14 substantially overlaps the transcribed portion of a constitutively expressed housekeeping gene.

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Selected References

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