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Title 

A family of telomere-associated autonomously replicating sequences and their functions in targered recombination in Hansenula polymorpha DL-1

Authors 

Jung Hoon SohnEui Sung ChoiKwang Hyun AhJoon Shick RheeSang Ki Rhee

Publisher 

American Society for Microbiology

Issue Date 

1999

Citation 

Journal of Bacteriology, vol. 181, no. 3, pp. 1005-1013

Keywords 

fungal geneticsgene sequencegenetic recombinationhansenula polymorphanonhumannucleotide sequenceplasmidpriority journalsequence homologytelomere

Abstract 

A family of multiple autonomously replicating sequences (ARSs) which are located at several chromosomal ends of Hansenula polymorpha DL-1 has been identified and characterized. Genomic Southern blotting with an ARS, HARS36, originating from the end of a chromosome, as a probe showed several homologues in the genome of H. polymorpha. Nucleotide sequences of the three fragments obtained by a selective cloning for chromosomal ends were nearly identical to that of HARS36. All three fragments harbored an ARS motif and ended with 18 to 23 identical repetitions of 5'-GGGTGGCG-3' which resemble the telomeric repeat sequence in other eukaryotes. Transformation of H. polymorpha with nonlinearized plasmids containing the newly obtained telomeric ARSs almost exclusively resulted in the targeted integration of a single copy or multiple tandem copies of the plasmid into the chromosomes. The sensitivity to exonuclease Bal31 digestion of the common DNA fragment in all integrants confirmed the telomeric origin of HARS36 homologues, suggesting that several chromosomal ends, if not all of them, consisted of the same ARS motif and highly conserved sequences observed in HARS36. Even though the frequencies of targeted recombination were varied among the ends of the chromosomes, the overall frequency was over 96%. The results suggested that the integration of the plasmids containing telemeric ARSs occurred largely through homologous recombination at the telomeric repeats, which serve as high-frequency recombination targets.

ISSN 

0021-9193

Appears in Collections

1. Journal Articles > Journal Articles

Registered Date

2017-04-19


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