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Analysis of subtelomeric heterochromatin in the Drosophila minichromosome Dp1187 by single P element insertional mutagenesis.

Karpen, G H, Spradling, A C·1992·Genetics

Abstract

We investigated whether single P element insertional mutagenesis could be used to analyze heterochromatin within the Drosophila minichromosome Dp1187. Forty-five insertions of the P[lacZ,rosy+] element onto Dp1187 (recovered among 7,825 transpositions) were highly clustered. None was recovered in centromeric heterochromatin, but 39 occurred about 40 kb from the distal telomere within a 4.7-kb hotspot containing tandem copies of a novel 1.8-kb repetitive DNA sequence. The DNA within and distal to this region lacked essential genes and displayed several other properties characteristic of heterochromatin. The rosy+ genes within the inserted transposons were inhibited by position-effect variegation, and the subtelomeric region was underrepresented in polytene salivary gland cells. These experiments demonstrated that P elements preferentially transpose into a small subset of heterochromatic sites, providing a versatile method for studying the structure and function of these chromosome regions. This approach revealed that a Drosophila chromosome contains a large region of subtelomeric heterochromatin with specific structural and genetic properties.

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Metadata

Authors
Karpen, G. H., & Spradling, A. C.
Venue
Genetics
Published
1992-11-01
Volume
132
Issue
3
Pages
737-753
ISSN
  • 0016-6731 (ISSN-L)
  • 1943-2631
OpenAlex
W1820076796
Cited by
397
References
2
FWCI
35.92
Type
journal article
Language
en
Open access
closed

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CoChat. (2026). Citation check: Analysis of subtelomeric heterochromatin in the Drosophila minichromosome Dp1187 by single P element insertional mutagenesis. https://app.cochat.ai/papers/10.1093/genetics/132.3.737
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Karpen, G. H., & Spradling, A. C. (1992). Analysis of subtelomeric heterochromatin in the Drosophila minichromosome Dp1187 by single P element insertional mutagenesis. Genetics. https://doi.org/10.1093/genetics/132.3.737

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