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. 1982 Jan 22;10(2):631–644. doi: 10.1093/nar/10.2.631

Organization of highly repetitive satellite DNA of two Cucurbitaceae species (Cucumis melo and Cucumis sativus).

V Hemleben, B Leweke, A Roth, J Stadler
PMCID: PMC326162  PMID: 6278425

Abstract

The prominent satellites of the Cucurbitaceae Cucumis melo (melon) and Cucumis sativus (cucumber) have been characterized, in actinomycin/CsCl gradients where the satellite sequences can be separated from ribosomal, organelle, and main band DNA the location of the satellites is different indicating a different GC content. The purified satellite of C. melo is cut by HindIII into a repeat unit of 380 bp; AluI digestion gives rise to two bands (about 80 and 220 bp in size). The HindIII repeat unit if cloned into pBR325 exhibits new recognition sites for HpaII leaving two bands with 150 and 80 bp suggesting methylation of the C/CGG cutting site in the uncloned material. The restriction pattern indicates an internal sequence repeat within the 380 bp HindIII fragment. The C. sativus satellite is cut by AluI to a repeat unit of 180 bp showing no other recognition site for the restriction enzymes tested so far. About 10% sequence homology has been determined between the C. melo and C. sativus satellites by cross hybridization studies. A high methylation degree of cytosines has been measured for both satellites and the ribosomal DNA of C. sativus (about 30%). No transcription products of the C. melo satellite were found during seedling development.

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Selected References

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