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Abstract Detail

Development and Structure

Sengupta, Aniket [1], Howarth, Dianella [2].

The origin of TCP, RAD, and DIV genes.

TCP genes (named after TEOSINTE BRANCHED1/CYCLOIDEA/PROLIFERATING CELL FACTOR) represent a gene family previously reported across green plants. RADIALIS (RAD) and DIVARICATA (DIV) are members of the MYB gene family present in eukaryotes and viruses. Members of TCP, RAD, and DIV proteins are important in defining several phenotypes, including floral zygomorphy. In our bioinformatic survey, we determine the origin of TCP, RAD, and DIV genes. With a bioinformatic approach, we show that TCP genes evolved in the common ancestor of Chara and land plants (absent in genomes of earlier diverging lineages). One copy each of CIN- and PCF-like TCP genes are present in Chara and early land plants, suggesting that the ancestral TCP gene underwent a duplication soon after its origin. We are currently investigating the origin of the conserved TCP domain that is characteristic of the TCP genes. By distant homology searches, we will determine whether the TCP domain evolved through modifications in another gene. RAD genes are known to have evolved from gymnosperm DIV genes. We report that RAD genes are sister to a particular clade of fern DIV genes, and likely evolved through a premature stop codon in the second codon, thus truncating the second MYB domain. We find that DIV genes are ancient - being present in Cryptophytes and Glaucophytes (likely lost in Rhodophytes), and in green plants. The characteristic MYB1 domain of DIV genes evolved from the MYB domain of that sub-clade of the MYB superfamily which includes the CIRCADIAN CLOCK ASSOCIATED 1 genes of flowerings plants.

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1 - St. John's University, Biological Sciences, 8000 Utopia Parkway, Albert Hall Room 257, Jamaica, NY, 11366, United States
2 - Boise State University, Snake River Plains Herbaria, , Boise, Idaho, 83725, USA


Presentation Type: Oral Paper
Session: DS2, Development and Structure II
Location: /
Date: Wednesday, July 21st, 2021
Time: 10:15 AM(EDT)
Number: DS2002
Abstract ID:292
Candidate for Awards:None

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