The organization of internal telomeric repeats in the polytene chromosomes of the hypotrichous ciliate Stylonychia lemnae.
There exist about 1000-1500 internal telomeric sequences per haploid genome in the polytene chromosomes of the hypotrichous ciliate Stylonychia lemnae. All these telomeric repeats are contained in a very conserved element. This element consists of two 2 kb direct repeats flanking a 2.6 kb sequence. Immediately adjacent to one of the repeats a 18mer C4A4C4A4C2 telomeric sequence is localized. Sequences homologous to macronuclear DNA follow 180 bp downstream of the C4A4-bloc. These macronuclear homologous sequences are flanked by the second direct repeat. The possible origin and function of these telomere containing elements is discussed.
Medizinisch-Naturwissenschaftliches Forschungszentrum, Universität Tübingen, Germany.
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Stoll
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Zirlik
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Maercker
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Lipps
D000818:Animals; D001483:Base Sequence; D002875:Chromosomes / Q000648:ultrastructure*; D016054:DNA, Protozoan; D008969:Molecular Sequence Data; D012091:Repetitive Sequences, Nucleic Acid; D015183:Restriction Mapping; D012689:Sequence Homology, Nucleic Acid; D016811:Sporadotrichina / Q000235:genetics* / Q000648:ultrastructure; D016615:Telomere
D016054:DNA, Protozoan