Dynamic relocation of telomere complexes in mouse meiotic chromosomes.
Telomeric DNA repeats as well as different specific proteins such as TRF1 and Rap1 associate in functional telomere complexes found at chromosome ends. Using spreading techniques, the presence of TRF1 and Rap1 has been reported at mammalian meiotic telomeres during prophase I. In the present study, we have analysed, by fluorescence in-situ hybridization and immunofluorescence, the appearance and location of telomere complexes during both male mouse meiotic divisions. Additionally, we have studied their relationship with different centromere/kinetochore proteins and the synaptonemal complex protein SCP3. Our results show that telomere complexes are not located at condensed meiotic chromosome tips. Therefore, a change in chromosome structure may occur from pachytene up to metaphase I involving the dynamic relocation of telomere complexes in condensed chromosomes. Moreover, we have found that proximal telomere complexes are relocated internally to kinetochores from metaphase I up to anaphase II. We discuss the functional significance of the location of telomere complexes into internal domains of condensed meiotic chromosomes.
Viera
Alberto
A
Unidad de Biología Celular, Departamento de Biología, Edificio de Ciencias Biológicas, Universidad Autónoma de Madrid, E-28049 Madrid, Spain. alberto.viera@uam.es
Parra
María Teresa
MT
Page
Jesús
J
Santos
Juan Luis
JL
Rufas
Julio S
JS
Suja
José A
JA
D000818:Animals; D033481:Chromosomes, Mammalian / Q000502:physiology*; D003078:Colchicine / Q000494:pharmacology; D018386:Kinetochores / Q000502:physiology; D008297:Male; D008540:Meiosis; D051379:Mice / Q000235:genetics*; D008810:Mice, Inbred C57BL; D013090:Spermatocytes / Q000166:cytology; D013573:Synaptonemal Complex / Q000502:physiology; D016615:Telomere / Q000502:physiology*
D003078:Colchicine