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Cloning, characterization and localization of Chinese hamster HP1 isoforms

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Abstract

The Chinese hamster is one of the few mammalian species that are characterized by relatively poor heterochromatin content. It was intriguing to test whether or not the lack of large blocks of heterochromatin in the hamster chromosomes could be correlated with the absence or species-specific differences of the HP1 proteins, the main structural components of heterochromatin. To address this, we attempted to clone HP1 from the Chinese hamster. It is shown here that all three isoforms of HP1 known in mammals are present in hamster, and the amino acid sequences deduced from the cDNAs of the isoforms are 97–100% identical to those of the known mammalian homologues. All three isoforms are localized mainly in heterochromatic regions in the native chromosomes and nuclei. The hamster HP1α gene was cloned, sequenced and mapped to the short arm of hamster chromosome 2.

These data indicate that the Chinese hamster has all the HP1 components necessary for the establishment of heterochromatin. The limited amount of heterochromatin in hamster cells may probably be attributed to the unusual satellite DNA content of the hamster genome.

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Authors and Affiliations

  1. Institute of Genetics, Biological Research Center, Hungarian Academy of Sciences, H-6701, Szeged, P.O.Box 521, Hungary

    Barnabás Szakál, Imre Cserpán, Erika Csonka, Éva Monostori & Gyula Hadlaczky

  2. Institute of Biochemistry, Biological Research Center, Hungarian Academy of Sciences, H-6701, Szeged, P.O.Box 521, Hungary

    Andor Udvardy

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  1. Barnabás Szakál
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  2. Imre Cserpán
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  3. Erika Csonka
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  4. Éva Monostori
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  5. Andor Udvardy
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  6. Gyula Hadlaczky
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Correspondence to Gyula Hadlaczky.

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Szakál, B., Cserpán, I., Csonka, E. et al. Cloning, characterization and localization of Chinese hamster HP1 isoforms. Chromosome Res 12, 483–493 (2004). https://doi.org/10.1023/B:CHRO.0000034750.34633.3c

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  • DOI: https://doi.org/10.1023/B:CHRO.0000034750.34633.3c

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