Evidence map›Paper›PMID 9501987›Full record

ArticleCurrent biology : CB1998

Fluctuations in cyclin E levels are required for multiple rounds of endocycle S phase in Drosophila.

P J Follette, R J Duronio, P H O'Farrell

Open access · bronzeAbstract read
In one paragraph

Article in Current biology : CB, 1998. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 66 papers.

0numbers the graph read from it
0cells of the map it votes in
66citing papers in PubMed
2.3field-weighted citation impact, top 11% of its field
1 · What the graph read from it

What it found

Each row is one number read from the abstract, on the scale the paper reported it, with its interval. Left of the dashed line favours the treatment, right favours the comparator. Under each row is the sentence it came from. New to these charts? A ten-minute tutorial.

The abstract states no effect estimate the extractor could read, or names no intervention and outcome on the map, so this paper lights no cell and moves no belief. It is still indexed, cited and linked below.

2 · The registry

The trial behind it

Trials whose registry record cites this paper, or whose number appears in the abstract. A trial that started after this paper was published is citing it as background, not reporting it.

Neither the registry nor the abstract names a trial number. If this is a trial report, that itself is worth knowing.

3 · Its place in the literature

Who cites it

66 citing papers in PubMed, 129 citations in OpenAlex.

  1. Article
  2. Article
  3. Morphological innovation without gene co-option: thebioRxiv : the preprint server for biology · 2026
    Article
  4. Review
  5. Review
  6. Review
  7. Article
  8. Noncanonical function of Capicua as a growth termination signal inProceedings of the National Academy of Sciences of the United States of America · 2022
    Article
  9. Review
  10. Article
  11. Article
  12. Cyclin E overexpression in theFrontiers in cell and developmental biology · 2022
    Article
  13. Article
  14. Article
  15. Review
  16. Polyploidy in tissue homeostasis and regeneration.Development (Cambridge, England) · 2018
    Review
  17. Review
  18. Article
  19. Growing an Embryo from a Single Cell: A Hurdle in Animal Life.Cold Spring Harbor perspectives in biology · 2015
    Review
  20. Article

6 more citing papers are in PubMed but not listed here.

4 · The record

Corrections and comments

PubMed lists nothing against this paper. Absence here is not a guarantee, only a check that was made.

5 · Who and what money

Authors and funding

3 authors at 2 institutions in 1 country.

P J FolletteDepartment of Biochemistry and Biophysics, University of California, San Francisco 94143-0448, USA.
R J Duronio
P H O'Farrell
University of California, San Francisco · USUniversity of North Carolina at Chapel Hill · US

Funding

MOLECULAR DETERMINANTS OF DEVELOPMENTAL FATER01GM037193 · NIGMS · UNIVERSITY OF CALIFORNIA, SAN FRANCISCO · PI O'FARRELL, PATRICK H · 1986 to 2009
$4.4M
NIGMS NIH HHS R01 GM037193
6 · The paper itself

Abstract

The precise cell-cycle alternation of S phase and mitosis is controlled by alternating competence of nuclei to respond to S-phase-inducing factors [1]. Nuclei acquire competence to replicate at the low point in cyclin-dependent kinase (Cdk) activities that follows mitotic destruction of cyclins. The elevation of Cdk activity late in G1 is thought to drive cells into S phase and to block replicated DNA from re-acquiring replication competence [2]. Whereas mitosis is normally required to eliminate the cyclins prior to another cycle of replication, experimental elimination of Cdk activity in G2 can restore competence to replicate [3-6]. Here, we examine the roles of Cdks in the endocycies of Drosophila [7]. In these cycles, rounds of discrete S phases without intervening mitoses result in polyteny. Cyclins A and B are lost in cells as they enter endocycles [8,9], and pulses of Cyclin E expression drive endocycle S phases [10-12]. To address whether oscillations of Cyclin E expression are required for endocycles, we expressed Cyclin E continuously in Drosophila salivary glands. Growth of the cells was severely inhibited, and a period of DNA replication was induced but further replication was inhibited. This replication inhibition could be overcome by the kinase inhibitor 6-dimethylaminopurine (6-DMAP), but not by expression of subunits of the transcription factor E2F. These results indicate that endocycle S phases require oscillations in Cdk activity, but, in contrast to oscillations in mitotic cells, these occur independently of mitosis.

Indexed as

S PhaseAnimalsCyclin-Dependent KinasesCyclin EDNA ReplicationDrosophilaSalivary GlandsCyclin-Dependent KinasesCyclin E

Identifiers

PMID9501987
PMCPMC2754236
OpenAlexW2017658415

What OpenQuestion holds

Textmetadata
Read underepoch 390

Registered trials

None linked

Read under generation 80e0d062 · epoch 390. Bibliography from PubMed, PubMed Central and OpenAlex; grants from NIH RePORTER; trial links from ClinicalTrials.gov; estimates, votes and beliefs from the OpenQuestion graph.