Journal
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
Volume 116, Issue 46, Pages 22915-22917Publisher
NATL ACAD SCIENCES
DOI: 10.1073/pnas.1910106116
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Funding
- University of California, Irvine [P30CA-062203]
- NIH shared instrumentation grants [1S10RR025496-01, 1S10OD01079401, 1S10OD021718-01]
- Austrian Science Fund Grant [P30686-B29]
- National Institute on Aging Grant [1R01AG037965-01]
- Templeton Foundation Immortality Project grant
- Pomona College Sara and Egbert Schenck Memorial Fund
- German Science Foundation Grants [SFB-873-A1-3, SFB-1324A5-1]
- University of California, Irvine, School of Medicine
- National Science Foundation CAREER Award [DEB 0953571]
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Transposable elements are one of the major contributors to genome-size differences in metazoans. Despite this, relatively little is known about the evolutionary patterns of element expansions and the element families involved. Here we report a broad genomic sampling within the genus Hydra, a freshwater cnidarian at the focal point of diverse research in regeneration, symbiosis, biogeography, and aging. We find that the genome of Hydra is the result of an expansion event involving long interspersed nuclear elements and in particular a single family of the chicken repeat 1 (CR1) class. This expansion is unique to a subgroup of the genus Hydra, the brown hydras, and is absent in the green hydra, which has a repeat landscape similar to that of other cnidarians. These features of the genome make Hydra attractive for studies of transposon-driven genome expansions and speciation.
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