Abstract
The 52 members of the Teosinte-Branched 1/Cycloidea/Proliferating Cell Factors (TCP) Transcription Factor gene family in Malus × domestica (M. × domestica) were identified in 2014 on the first genome assembly, which was released in 2010. In 2017, a higher quality genome assembly for apple was released and is now considered to be the reference genome. Moreover, as in several other species, the identified TCP genes were named based on the relative position of the genes on the chromosomes. The present work consists of an update of the TCP gene family based on the latest genome assembly of M. × domestica. Compared to the previous classification, the number of TCP genes decreased from 52 to 40 as a result of the addition of three sequences and the deduction of 15. An analysis of the intragenic identity led to the identification of 15 pairs of orthologs, shedding light on the forces that shaped the evolution of this gene family. Furthermore, a revised nomenclature system is proposed that is based both on the intragenic identity and the homology with Arabidopsis thaliana (A. thaliana) TCPs in an effort to set a common standard for the TCP classification that will facilitate any future interspecific analysis.
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