title: Molecular characterization of Quercus suber MYB1, a transcription factor up-regulated in cork tissues.
abstract: The molecular processes associated with cork development in Quercus suber L. are poorly understood. A previous molecular approach identified a list of genes potentially important for cork formation and differentiation, providing a new basis for further molecular studies. This report is the first molecular characterization of one of these candidate genes, QsMYB1, coding for an R2R3-MYB transcription factor. The R2R3-MYB gene sub-family has been described as being involved in the phenylpropanoid and lignin pathways, both involved in cork biosynthesis. The results showed that the expression of QsMYB1 is putatively mediated by an alternative splicing (AS) mechanism that originates two different transcripts (QsMYB1.1 and QsMYB1.2), differing only in the 5'-untranslated region, due to retention of the first intron in one of the variants. Moreover, within the retained intron, a simple sequence repeat (SSR) was identified. The upstream regulatory region of QsMYB1 was extended by a genome walking approach, which allowed the identification of the putative gene promoter region. The relative expression pattern of QsMYB1 transcripts determined by reverse transcription quantitative polymerase chain reaction (RT-qPCR) revealed that both transcripts were up-regulated in cork tissues; the detected expression was several times higher in newly formed cork harvested from trees producing virgin, second or reproduction cork when compared with wood. Moreover, the expression analysis of QsMYB1 in several Q. suber organs showed very low expression in young branches and roots, whereas in leaves, immature acorns or male flowers, no expression was detected. These preliminary results suggest that QsMYB1 may be related to secondary growth and, in particular, with the cork biosynthesis process with a possible alternative splicing mechanism associated with its regulatory function.
authors.affiliation: Centro de Biotecnologia Agrícola e Agro-Alimentar do Baixo Alentejo e Litoral (CEBAL)/Instituto Politécnico de Beja (IPBeja), Rua Pedro Soares, 7801-908 Beja, Portugal.
authors.forename: Tânia
authors.initials: T
authors.lastname: Almeida
authors.forename: Esther
authors.initials: E
authors.lastname: Menéndez
authors.forename: Tiago
authors.initials: T
authors.lastname: Capote
authors.forename: Teresa
authors.initials: T
authors.lastname: Ribeiro
authors.forename: Conceição
authors.initials: C
authors.lastname: Santos
authors.forename: Sónia
authors.initials: S
authors.lastname: Gonçalves
mesh_terms: D017398:Alternative Splicing; D000595:Amino Acid Sequence; D018506:Gene Expression Regulation, Plant; D017343:Genes, Plant; D008055:Lipids / Q000096:biosynthesis; D008969:Molecular Sequence Data; D024301:Plant Bark / Q000235:genetics* / Q000378:metabolism*; D010937:Plant Growth Regulators / Q000096:biosynthesis; D010940:Plant Proteins / Q000737:chemistry* / Q000378:metabolism*; D029963:Quercus / Q000235:genetics* / Q000378:metabolism*; D018749:RNA, Plant; D014157:Transcription Factors / Q000737:chemistry* / Q000378:metabolism*; D015854:Up-Regulation
chemical_list: D008055:Lipids; D010937:Plant Growth Regulators; D010940:Plant Proteins; D018749:RNA, Plant; D014157:Transcription Factors; C065875:suberin