The aim of this project is to determine the primary structure of telomeres and adjacent sequences - the regions at the ends of chromosomes - of rotifers of the ancient ameiotic class Bdelloidea and to compare it with that of rotifers of the facultatively sexual sister class, the Monogononta. As bdelloid rotifers have evolved for many millions of years without meiosis and because chromosome ends of sexually reproducing species play an important and specific role in meiosis, it is expected that the proposed study will reveal features of chromosome ends specifically involved in meiosis. Because of this and also because it has been found that bdelloid rotifers lack the simple sequence repeats found at the chromosome ends of nearly all sexually-reproducing species, it is also expected that bdelloid chromosome ends will be found to have novel structures the elucidation of which will add importantly to our knowledge of telomere function and evolution. The chromosomal end-regions of three species of bdelloids and two species of monogononts will be cloned and sequenced, employing a novel procedure for the selection of clones containing chromosome ends, regardless of whether they do or do not contain the simple sequence repeats characteristic of telomeres commonly found in other species. As telomeres are involved in diverse pathologies, including metastatic growth, the results of the proposed study may provide insight into mechanisms and possible therapies of importance.

Agency
National Institute of Health (NIH)
Institute
National Institute of General Medical Sciences (NIGMS)
Type
Research Project (R01)
Project #
5R01GM072708-03
Application #
7274752
Study Section
Genetics Study Section (GEN)
Program Officer
Carter, Anthony D
Project Start
2005-09-01
Project End
2009-02-28
Budget Start
2007-09-01
Budget End
2009-02-28
Support Year
3
Fiscal Year
2007
Total Cost
$152,392
Indirect Cost
Name
Harvard University
Department
Microbiology/Immun/Virology
Type
Schools of Arts and Sciences
DUNS #
082359691
City
Cambridge
State
MA
Country
United States
Zip Code
02138
Gladyshev, Eugene A; Meselson, Matthew; Arkhipova, Irina R (2008) Massive horizontal gene transfer in bdelloid rotifers. Science 320:1210-3
Gladyshev, Eugene A; Meselson, Matthew; Arkhipova, Irina R (2007) A deep-branching clade of retrovirus-like retrotransposons in bdelloid rotifers. Gene 390:136-45