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Nucleic Acids Research, 1989, Vol. 17, No. 14 5579-5586
© 1989

MOLECULAR BIOLOGY

Distribution and sequence homogeneity of an abundant satellite DNA in the beetle, Tenebrio Molitor

Claytus A. Davis* and Gerard R. Wyatt

Department of Biology, Wueen's University Kingston, Ontario K7L 3N6, Canada

Received March 17, 1989. Revised June 13, 1989. Accepted June 13, 1989.

The mealworm beetle, Tenebrio molitor, contains an unusually abundant and homogeneous satellite DNA which constitutes up to 60% of its genome. The satellite DNA is shown to be present in all of the chromosomes by in situ hybridization. 18 dimers of the repeat unit were cloned and sequenced.The consensus sequence is 142 nt long and lacks any internal repeat structure. Monomers of thesequence are very similar, showing on average a 2% divergence from the calculated consensus. Variant nucleotides are scattered randomly throughout the sequence although some variants are more common than others. Neighboring repeat units are no more alike than randomly chosen ones. The results suggest that some mechanism, perhaps gene conversion, is acting to maintain the homogeneity of the satellite DNA despite its abundance and distribution on all of the chromosomes.

*Present address: Mount Sinai Hospital Research Institute, 600 UNiversity Avenue, Toronto, Ontario M5G IX5, Canada


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