Molecular cloning and chromosomal localization of Chinese hamster telomeric protein chTRF1. Its potential role in chromosomal instability

Lubomir B. Smilenov, Wilfredo Mellado, Pulivarthi H. Rao, Satin G. Sawant, Christopher B Umbricht, Saraswati Sukumar, Tej K. Pandita

Research output: Contribution to journalArticle

Abstract

Chinese hamster cells frequently have altered karyotypes. To investigate the basis of recent observations that karyotypic alterations are related to telomeric fusions, we asked whether these alterations are due to lack of telomere repeat binding factor/s. Further, Chinese hamster chromosomes contain large blocks of interstitial telomeric repeats, which are preferentially involved in chromosome breakage and exchange, rendering it an interesting model for such studies. Here, we report on the cloning and the chromosomal localization of the Chinese hamster telomere repeat binding factor, chTRF1. The sequence analysis revealed, similar to human TRF1 (hTRF1), an N-terminal acidic domain, a TRF1 specific DNA binding motif and a C-terminal Myb type domain. Unlike mouse TRF1 (mTRF1), chTRF1 shows 97.5% identity to hTRF1. chTRF1 gene was localized on the long arm of chromosome 5. In vitro translation of chTRF1 resulted in protein product similar in molecular weight to hTRF1. Immunostaining of Chinese hamster ovary cells (CHO) with anti-TRF1 antibody revealed punctate nuclear staining. At metaphase, antibodies failed to detect TRF1 on most of the chromosome ends and the interstitial telomeric repeat bands. These studies suggest that chTRF1 does not bind the interstitial telomeric repeats, and its presence at the metaphase chromosome ends is limited. The later could be a factor contributing to frequent karyotypic alterations observed in Chinese hamster cells.

Original languageEnglish (US)
Pages (from-to)2137-2142
Number of pages6
JournalOncogene
Volume17
Issue number16
StatePublished - Oct 22 1998

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Chromosomal Instability
Molecular Cloning
Cricetulus
Telomere-Binding Proteins
Chromosomes
Metaphase
Proteins
Chromosome Breakage
Chromosomes, Human, Pair 5
Nucleotide Motifs
Karyotype
Sequence Analysis
Organism Cloning
Anti-Idiotypic Antibodies
Ovary
Molecular Weight
Staining and Labeling
Antibodies
Genes

Keywords

  • chTRF1
  • Identity
  • Localization

ASJC Scopus subject areas

  • Molecular Biology
  • Cancer Research
  • Genetics

Cite this

Molecular cloning and chromosomal localization of Chinese hamster telomeric protein chTRF1. Its potential role in chromosomal instability. / Smilenov, Lubomir B.; Mellado, Wilfredo; Rao, Pulivarthi H.; Sawant, Satin G.; Umbricht, Christopher B; Sukumar, Saraswati; Pandita, Tej K.

In: Oncogene, Vol. 17, No. 16, 22.10.1998, p. 2137-2142.

Research output: Contribution to journalArticle

Smilenov, Lubomir B. ; Mellado, Wilfredo ; Rao, Pulivarthi H. ; Sawant, Satin G. ; Umbricht, Christopher B ; Sukumar, Saraswati ; Pandita, Tej K. / Molecular cloning and chromosomal localization of Chinese hamster telomeric protein chTRF1. Its potential role in chromosomal instability. In: Oncogene. 1998 ; Vol. 17, No. 16. pp. 2137-2142.
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