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Molecular and genetic studies on the euchromatin-heterochromatin transition region of the X chromosome of Drosophila melanogaster

1. A cloned entry point near to the uncoordinated (unc) locus

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Abstract

A recombinant Charon 4 bacteriophage has been isolated on the basis of RNAs which are enriched in the head of the adult Drosophila melanogaster and hence are likely to be of neural origin. The cloned insert maps to the near vicinity of the uncoordinated locus in polytene chromosome band 19E8. This band is within the transition zone between the euchromatic and heterochromatic regions of the X chromosome, a region which has been well characterized cytogenetically. The insert contains both repetitious and low copy number sequences, some of which vary extensively in both frequency and restriction fragment size between different laboratory strains. One particular family of moderately repeated sequences occurs predominantly in divisions 19 and 20 of the X chromosome and perhaps the distally located X heterochromatin. The molecular landscape surrounding the initial entry point contains many repeated sequences and is thus unlike those observed in most published chromosomal walks. The possible significance of the presence of repeated sequence families in the distinct properties of this region are discussed.

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Authors and Affiliations

  1. Research School of Biological Sciences, Australian National University, Canberra, A.C.T., Australia

    George L. Gabor Miklos, Marion J. Healy & Robyn J. Russell

  2. Biochemistry Department, Australian National University, Canberra, A.C.T., Australia

    P. Pain & A. J. Howells

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  1. George L. Gabor Miklos
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  2. Marion J. Healy
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  3. P. Pain
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  4. A. J. Howells
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  5. Robyn J. Russell
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Miklos, G.L.G., Healy, M.J., Pain, P. et al. Molecular and genetic studies on the euchromatin-heterochromatin transition region of the X chromosome of Drosophila melanogaster . Chromosoma 89, 218–227 (1984). https://doi.org/10.1007/BF00295003

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  • DOI: https://doi.org/10.1007/BF00295003

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