Abstract Detail

Comparative Genomics/Transcriptomics

Schlutius, Caroline [1], Puzey, Joshua [2].

Patterns of subgenome evolution after allopolyploidization in a clade of Chilean Mimulus.

The duplication of an entire genome has long been recognized as an important evolutionary phenomenon. This condition, polyploidy, is common among many phyla but is especially prevalent in plants. Following whole genome duplications (WGD), purifying selection may be relaxed due to duplicate sets of genes. This relaxation of purifying selection is thought to facilitate the evolution of novel phenotypes. The high frequency of WGD throughout angiosperms, combined with the possible benefits of having extra genetic material, prompts an obvious question: why haven’t plant genomes consistently increased in size across evolutionary time? The short answer to this question is that following WGD, genomes rapidly decrease their size through the loss of redundant genetic information. Research has shown that patterns of genome loss following WGD is frequently biased – with one copy of the genome (termed subgenome) accumulating the majority of deletions. One open question that remains is whether the subgenome ‘chosen’ for deletion accumulation following WGD is randomly selected or somehow predetermined.  The goal of my research is to begin to answer this question by examining patterns of mutation accumulation and functional changes (gene expression) in four lineages of Chilean monkeyflower (Mimulus) that share an ancient WGD event. In addition, we will seek not only to answer whether genome downsizing is consistent across these lineages, but whether the local genomic environment, specifically transposon density, correlates with deletion accumulation patterns.  

1 - 604 Colonial Ave, Williamsburg, VA, 23185, United States
2 - College Of William And Mary, Biology Dept., 540 Landrum Dr., Williamsburg, VA, 23185, United States

subgenome dominance

Presentation Type: Poster This poster will be presented at 6:15 pm. The Poster Session runs from 5:30 pm to 7:00 pm. Posters with odd poster numbers are presented at 5:30 pm, and posters with even poster numbers are presented at 6:15 pm.
Number: PGT002
Abstract ID:147
Candidate for Awards:Genetics Section Poster Award

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