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Position-effect variegation and intercalary heterochromatin: a comparative study

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Abstract

The behaviour of IH (intercalary heterochromatin) regions of Drosophila melanogaster polytene chromosomes was compared with that of euchromatin condensed as a result of position-effect variegation. Normally replicating regions, when subject to such an effect, were found to become among the last regions in the genome to replicate. It is shown that the factors which enhance position effect (low temperature, the removal of the Y chromosome, genetic enhancers of position effect) increase the weak point frequency in the IH, i.e. enhance DNA underreplication in these regions. We suggest that the similarity in the properties of IH, CH (centromeric heterochromatin) and the dense blocks induced by position effect is due to strong genetic inactivation and supercondensation caused by specific proteins in early development. The primary DNA structure is not likely to play a key role in this process.

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  1. Institute of Cytology and Genetics, 630090, Novosibirsk, USSR

    I. F. Zhimulev, E. S. Belyaeva, V. N. Bolshakov & N. I. Mal'ceva

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  1. I. F. Zhimulev
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  2. E. S. Belyaeva
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  3. V. N. Bolshakov
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  4. N. I. Mal'ceva
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Zhimulev, I.F., Belyaeva, E.S., Bolshakov, V.N. et al. Position-effect variegation and intercalary heterochromatin: a comparative study. Chromosoma 98, 378–387 (1989). https://doi.org/10.1007/BF00292391

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  • DOI: https://doi.org/10.1007/BF00292391

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