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. 1993 Apr 25;21(8):1783–1788. doi: 10.1093/nar/21.8.1783

The organization of internal telomeric repeats in the polytene chromosomes of the hypotrichous ciliate Stylonychia lemnae.

S Stoll 1, T Zirlik 1, C Maercker 1, H J Lipps 1
PMCID: PMC309415  PMID: 8493097

Abstract

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.

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