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Abstract Detail



Comparative Genomics/Transcriptomics

Grusz, Amanda [1], Fehrenbach, Patrick [2], Sigel, Erin [3].

From deep phylogeny to species complexes: The evolution of genomic repetitive elements in ferns.

The use of genome-scale data for phylogenetic inferences and comparative genomics has revolutionized evolutionary studies of ferns, a lineage previously sidelined because of their large genome sizes and high chromosome numbers. While published fern genomes remain forthcoming, low-coverage genome skimming has permitted first glimpses into the broad-scale genomic composition of ferns, particularly with respect to the abundance of repetitive elements relative to spermatophytes. Ferns generally have higher percentages of repetitive sequences compared to seed plants, but the abundance and evolution of transposable elements and other repeat types within major fern lineages are mostly unknown. Here, we present the results of a comparative genomic study of repeat content and composition among members of the Myriopteris yavapensis complex—a well-studied reticulate group that is notorious for frequent hybridization, polyploidy, and apomixis. We interpret our findings in a phylogenetic context, leveraging previously generated repeat data from across the family (Pteridaceae). We further assess whether the abundance of various repetitive elements correlate with life history characteristics (e.g. genome size, chromosome number, and reproductive mode) in the group. This study lays the groundwork for future exploration of repetitive elements and their role in shaping genome structure, content, and size across ferns, and illuminates variation in mobile element composition among closely related members of this reticulate species complex.


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1 - University Of Minnesota Duluth, Biology, 1035 Kirby Drive, SSB 207, Duluth, MN, 55812, United States
2 - University of Minnesota Duluth, Biology, 1035 Kirby Drive, SSB 207, Duluth, MN, 55812, USA
3 - University of Louisiana Lafayette, Biology, 410 E. St. Mary Blvd, Billeaud Hall, Lafayette, LA, 70503, USA

Keywords:
apomixis
Hybridization
Polyploidy
transposable elements.

Presentation Type: Oral Paper
Session: 25, Comparative Genomics and Transcriptomics II
Location: 102/Mayo Civic Center
Date: Tuesday, July 24th, 2018
Time: 2:00 PM
Number: 25005
Abstract ID:899
Candidate for Awards:Margaret Menzel Award


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