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Detection and distribution patterns of telomerase activity in insects
1Graduate School of Frontier Sciences, University of Tokyo, Japan.
European Journal of Biochemistry
|May 12, 2000
Summary
Insect telomerase activity varies across species. Researchers found telomerase synthesizing (TTAGG)n repeats in crickets and cockroaches but not in Dipteran insects, suggesting alternative telomere maintenance mechanisms.
Area of Science:
- Molecular Biology
- Genetics
- Entomology
Background:
- Telomeres, protective caps on chromosomes, typically consist of (TTAGG)n repeats in insects.
- However, Diptera and some other insect groups lack these repeats, implying alternative telomere maintenance strategies, possibly independent of telomerase.
Purpose of the Study:
- To investigate the characteristics of a previously undescribed insect telomerase.
- To understand the diverse mechanisms of telomere formation in insects.
Main Methods:
- Utilized a modified telomeric repeat amplification protocol (TRAP) to detect telomerase activity.
- Analyzed the substrate requirements and synthesized repeat sequences of insect telomerases.
Main Results:
- Detected telomerase activity in crickets, cockroaches, and two Lepidopteran insects, synthesizing (TTAGG)n repeats.
- Cockroach telomerase was present in both somatic and germ line cells, indicating broad expression.
- Telomerase activity was notably absent in silkworm (Bombyx mori) and several Dipteran cell lines (Drosophila, Sarcophaga).
Conclusions:
- Insect telomerase activity is not universal and exhibits significant variation.
- The findings support the hypothesis that Dipteran insects maintain telomeres without telomerase, highlighting diverse evolutionary strategies for genome stability.