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Abstract Detail

Comparative Genomics/Transcriptomics

Li, Zheng [1], Liu, Yifei [2], Barker, Michael S. [3].

The Coptis chinensis genome sheds light on eudicot genome duplications.

The genus Coptis (Ranunculaceae) has approximately 15 recognized species and mostly found in regions of warm temperate climates and cold coniferous forests of eastern Asia to North America. The rhizomes of Coptis, also known as Huanglian in Chinese, have been used in traditional Chinese medicine for thousands of years. Here, we report a 0.937 Gb chromosome-level assembly of the Coptis chinensis genome. This genome is one of the most complete genomes yet available for the Ranunculales with a scaffold N50 of 0.807 Mb. This highly contiguous genome assembly provides syntenic evidence for an ancient whole genome duplication (WGD) shared by the Ranunculaceae. A recent hypothesis proposed that the Ranunculaceae and most eudicots share the first round of WGD that occurred during the two-step eudicot paleohexaploidy event. Using synteny analyses, gene age distributions, and a phylogenomic approach, we used the new genome of Coptis chinensis to test if the genome was duplicated during the first round of the eudicot hexaploidization. Consistent with other recent studies, our results reject this hypothesis and support an independent WGD in the ancestry of the Ranunculaceae and clarify other ancient genome duplications in the Ranunculales. Overall, our study provides insights and key resources for understanding the genome evolution of Eudicots.

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1 - University Of Arizona, Department Of Ecology And Evolutionary Biology, P.O. Box 210088, Tucson, AZ, 85721, United States
2 - Hubei University of Chinese Medicine, College of Pharmacy, Wuhan, Hubei, China
3 - University Of Arizona, Department Of Ecology & Evolutionary Biology, P.O. Box 210088, Tucson, AZ, 85721, United States

Whole genome duplication
genome evolution

Presentation Type: Oral Paper
Session: CGT1, Comparative Genomics/Transcriptomics I
Location: /
Date: Tuesday, July 20th, 2021
Time: 10:15 AM(EDT)
Number: CGT1002
Abstract ID:332
Candidate for Awards:Margaret Menzel Award

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