Abstract
The repetitive DNA that constitutes most of the heterochromatic regions of metazoan genomes has hindered the comprehensive analysis of gene content and other functions. We have generated a detailed computational and manual annotation of 24 megabases of heterochromatic sequence in the Release 5 Drosophila melanogaster genome sequence. The heterochromatin contains a minimum of 230 to 254 protein-coding genes, which are conserved in other Drosophilids and more diverged species, as well as 32 pseudogenes and 13 noncoding RNAs. Improved methods revealed that more than 77% of this heterochromatin sequence, including introns and intergenic regions, is composed of fragmented and nested transposable elements and other repeated DNAs. Drosophila heterochromatin contains "islands" of highly conserved genes embedded in these "oceans" of complex repeats, which may require special expression and splicing mechanisms.
MeSH Terms
Animals
Chromosome Mapping
Computational Biology
Conserved Sequence
DNA Transposable Elements
DNA, Complementary
Drosophila/genetics
Drosophila Proteins/genetics
Drosophila melanogaster/genetics
Exons
Expressed Sequence Tags
Genes, Insect
Genome
Heterochromatin/genetics
Insecta/genetics
Introns
Pseudogenes
RNA, Untranslated/genetics
Repetitive Sequences, Nucleic Acid
Retroelements
Sequence Analysis, DNA
Chemicals
DNA Transposable Elements
DNA, Complementary
Drosophila Proteins
Heterochromatin
RNA, Untranslated
Retroelements
Authors & Affiliations
4 authors, click to expand affiliations / ORCID
Smith Christopher D
Department of Biology, San Francisco State University, San Francisco, CA 94132, USA.
Shu Shengqiang
Mungall Christopher J
Karpen Gary H
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