[No authors listed]
Telomere protects the ends of linear chromosomes. Telomere dysfunction fuels genome instability that can lead to diseases such as cancer. For over 30 years, Drosophila has fascinated the field as the only major model organism that does not rely on the conserved telomerase enzyme for end protection. Instead of short DNA repeats at chromosome ends, Drosophila has domesticated retrotransposons. In addition, telomere protection can be entirely sequence-independent under normal laboratory conditions, again dissimilar to what has been established for telomerase-maintained systems. Despite these major differences, recent studies from us and others have revealed remarkable similarities between the 2 systems. In particular, with the identification of the MTV complex as an ssDNA binding complex essential for telomere integrity in Drosophila (Zhang et al. 2016 Plos Genetics), we have now established several universal principles that are intrinsic to chromosome extremities but independent of the underlying DNA sequences or the telomerase enzyme. Telomere studies in Drosophila will continue to yield fundamental insights that are instrumental to the understanding of the evolution of telomere and telomeric functions.
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