Divergence of recently duplicated M{gamma}-type MADS-box genes in Petunia

Molecular Biology and Evolution
Marian BemerGerco C Angenent

Abstract

The MADS-box transcription factor family has expanded considerably in plants via gene and genome duplications and can be subdivided into type I and MIKC-type genes. The two gene classes show a different evolutionary history. Whereas the MIKC-type genes originated during ancient genome duplications, as well as during more recent events, the type I loci appear to experience high turnover with many recent duplications. This different mode of origin also suggests a different fate for the type I duplicates, which are thought to have a higher chance to become silenced or lost from the genome. To get more insight into the evolution of the type I MADS-box genes, we isolated nine type I genes from Petunia, which belong to the Mgamma subclass, and investigated the divergence of their coding and regulatory regions. The isolated genes could be subdivided into two categories: two genes were highly similar to Arabidopsis Mgamma-type genes, whereas the other seven genes showed less similarity to Arabidopsis genes and originated more recently. Two of the recently duplicated genes were found to contain deleterious mutations in their coding regions, and expression analysis revealed that a third paralog was silenced by mutations in its regulatory...Continue Reading

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Citations

Apr 28, 2011·Proceedings of the National Academy of Sciences of the United States of America·Chengjun ZhangQifa Zhang
Jul 1, 2010·Genome Biology·Lydia Gramzow, Guenter Theissen
Apr 29, 2015·Plant Biotechnology Journal·Choun-Sea LinMing-Che Shih

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