, Volume 124, Issue 1, pp 95–106 | Cite as

DNA replication in nurse cell polytene chromosomes of Drosophila melanogaster otu mutants

  • Dmitry E. KoryakovEmail author
  • Igor F. Zhimulev
Research Article


Drosophila cell lines are used extensively to study replication timing, yet data about DNA replication in larval and adult tissues are extremely limited. To address this gap, we traced DNA replication in polytene chromosomes from nurse cells of Drosophila melanogaster otu mutants using bromodeoxyuridine incorporation. Importantly, nurse cells are of female germline origin, unlike the classical larval salivary glands, that are somatic. In contrast to salivary gland polytene chromosomes, where replication begins simultaneously across all puffs and interbands, replication in nurse cells is first observed at several specific chromosomal regions. For instance, in the chromosome 2L, these include the regions 31B-E and 37E and proximal parts of 34B and 35B, with the rest of the decondensed chromosomal regions joining replication process a little later. We observed that replication timing of pericentric heterochromatin in nurse cells was shifted from late S phase to early and mid stages. Curiously, chromosome 4 may represent a special domain of the genome, as it replicates on its own schedule which is uncoupled from the rest of the chromosomes. Finally, we report that SUUR protein, an established marker of late replication in salivary gland polytene chromosomes, does not always colocalize with late-replicating regions in nurse cells.


Drosophila DNA replication Heterochromatin Chromosome 4 Polytene chromosomes Nurse cells 



The authors are grateful to A.A. Gorchakov, O.V. Demakova, D.A. Maksimov, and E.S. Belyaeva for their comments and help in data interpretation. The work was supported by the grant of the Russian Science Foundation (14-14-00934).


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Copyright information

© Springer-Verlag Berlin Heidelberg 2014

Authors and Affiliations

  1. 1.Institute of Molecular and Cellular Biology SB RASNovosibirsk State UniversityNovosibirskRussia

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