PlantTFDB
Plant Transcription Factor Database
v4.0
Previous version: v1.0, v2.0, v3.0
Phoenix dactylifera
M-type_MADS Family
Species TF ID Description
PDK_30s1019671g001M-type_MADS family protein
PDK_30s1027421g001M-type_MADS family protein
PDK_30s1057761g003M-type_MADS family protein
PDK_30s1067671g004M-type_MADS family protein
PDK_30s1091161g001M-type_MADS family protein
PDK_30s1101201g001M-type_MADS family protein
PDK_30s1103021g001M-type_MADS family protein
PDK_30s1103751g025M-type_MADS family protein
PDK_30s657581g001M-type_MADS family protein
PDK_30s676151g001M-type_MADS family protein
PDK_30s679071g003M-type_MADS family protein
PDK_30s693301g004M-type_MADS family protein
PDK_30s729041g004M-type_MADS family protein
PDK_30s740721g001M-type_MADS family protein
PDK_30s744781g001M-type_MADS family protein
PDK_30s745991g001M-type_MADS family protein
PDK_30s747321g001M-type_MADS family protein
PDK_30s764621g003M-type_MADS family protein
PDK_30s772911g001M-type_MADS family protein
PDK_30s779001g001M-type_MADS family protein
PDK_30s785291g001M-type_MADS family protein
PDK_30s786001g002M-type_MADS family protein
PDK_30s808181g001M-type_MADS family protein
PDK_30s860691g001M-type_MADS family protein
PDK_30s879231g001M-type_MADS family protein
PDK_30s883061g001M-type_MADS family protein
PDK_30s906581g001M-type_MADS family protein
PDK_30s909461g005M-type_MADS family protein
PDK_30s920901g001M-type_MADS family protein
PDK_30s932621g001M-type_MADS family protein
PDK_30s969461g004M-type_MADS family protein
PDK_30s973861g013M-type_MADS family protein
PDK_30s983711g006M-type_MADS family protein
PDK_30s983711g007M-type_MADS family protein
PDK_30s983711g008M-type_MADS family protein
PDK_30s989431g002M-type_MADS family protein
M-type_MADS (M-type MADS) Family Introduction

The best studied plant MADS-box transcription factors are those involved in floral organ identity determination. Analysis of homeotic floral mutants resulted in the formulation of a genetic model, named the ABC model, that explains how the combined functions of three classes of genes (A, B, and C) determine the identity of the four flower organs (reviewed by Coen and Meyerowitz, 1991). Arabidopsis has two A-class genes (AP1 and AP2 [Bowman et al., 1989]), two B-class genes (PI and AP3), and a single C-class gene (AG), of which only AP2 is not a MADS-box gene. Recently, it was shown that the Arabidopsis B- and C-function genes, which control petal, stamen, and carpel development, are functionally dependent on three highly similar MADS-box genes, SEP1, SEP2, and SEP3 (Pelaz et al., 2000). Interestingly, only when mutant knockout alleles of the three SEP genes were combined in a triple sep1 sep2 sep3 mutant was loss of petal, stamen, and carpel identity observed, resulting in a flower composed of only sepals. This example shows that redundancy occurs in the MADS-box gene family, which complicates reverse genetic strategies for gene function analysis. The SHP genes provide another example of MADS-box gene redundancy. shp1 and shp2 single mutants do not exhibit any phenotypic effect, whereas in the double mutant, development of the dehiscence zone is disturbed in the fruit, resulting in a failure to release seeds (Liljegren et al., 2000)[1].

It has been proposed that there are at least 2 lineages (type I and type II) of MADS-box genes in plants, animals, and fungi. Most of the well-studied plant genes are type II genes and have three more domains than type I genes from the N to the C terminus of the protein:intervening (I) domain (~30 codons), keratin-lik e coiled-coil (K) domain (~70 codons), and Cterminal (C) domain (variable length). These genes are called the MIKC-type and are specific to plants[2].

The MADS-box is a DNA binding domain of 58 amino acids that binds DNA at consensus recognition sequences known as CArG boxes [CC(A/T)6GG] (Hayes et al., 1988; Riechmann et al., 1996b). The interaction with DNA has been studied in detail for the human and yeast MADS-box proteins thanks to the resolved crystal structures (Pellegrini et al., 1995; Santelli and Richmond, 2000). The I domain is less conserved and contributes to the specification of dimerization. The K domain is characterized by a coiled-coil structure, which facilitates the dimerization of MADS-box proteins (Davies et al., 1996; Fan et al., 1997). The C domain is the least conserved domain; in some cases, it has been shown to contain a transactivation domain or to contribute to the formation of multimeric MADS-box protein complexes (Egea-Cortines et al., 1999; Honma and Goto, 2001)[1].

1.Parenicova L, de Folter S, Kieffer M, Horner DS, Favalli C, Busscher J, Cook HE, Ingram RM, Kater MM, Davies B, Angenent GC, Colombo L.
Molecular and phylogenetic analyses of the complete MADS-box transcription factor family in Arabidopsis: new openings to the MADS world.
Plant Cell. 2003 Jul;15(7):1538-51.
PMID: 12837945
2.Nam J, dePamphilis CW, Ma H, Nei M.
Antiquity and evolution of the MADS-box gene family controlling flower development in plants.
Mol Biol Evol. 2003 Sep;20(9):1435-47. Epub 2003 May 30.
PMID: 12777513