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	Provedor de dados Naturalis (3) Autor Geuten, K. (3) Janssens, S. (3) Viaene, T. (3) Smets, E. (2) Becker, A. (1) Caris, P. (1) Huysmans, S. (1) Kaufmann, K. (1) Smets, E.F. (1) Theißen, G. (1) Yi, S. (1) Yong-Ming, Y. (1) Mais... Palavra-chave Impatiens (2) 42.48 (1) 42.58 (1) APETALA3 /DEFICIENS C-terminal domain frameshift gene duplication impatiens selection indels 42.43 (1) APETALA3/DEFICIENS (1) Class B genes (1) Gene duplication (1) ImpDEF1 (1) ImpDEF2 (1) K-domain (1) MADS-box genes (1) Marcgravia (1) Petal identity (1) Phylogenetic utility (1) SEPALLATA3 (1) Mais... Tipo do documento Article / Letter to the editor (3) Ano 2008 (1) 2007 (1) 2006 (1) País Netherlands (3)		Ordenar por:  Relevância Autor Título Ano Registros recuperados: 3 Primeira ... 1 ... Última Selection on length mutations after frameshift can explain the origin and retention of the AP3/DEF-like paralogues in Impatiens Naturalis Janssens, S.; Viaene, T.; Huysmans, S.; Huysmans, S.; Smets, E.F.; Geuten, K.. Evolution of class B genes through gene duplication has been proposed as an evolutionary mechanism that contributed to the enormous floral diversity. Frameshift mutations are a likely mechanism to explain the divergent C-terminal sequences of MIKC gene subfamilies. So far, the inferences for frameshifts and selective pressures on the C-terminal domain are made for old duplications for which the exact selective pressures are obscured by evolutionary time. This motivated us to study an example of a recent duplication, which allows us to consider in more detail the selective pressures that are involved after duplication. We find that after duplication and frameshift of Impatiens class B genes, the individual codons show no evidence for adaptive selection. It... Tipo: Article / Letter to the editor Palavras-chave: APETALA3 /DEFICIENS C-terminal domain frameshift gene duplication impatiens selection indels 42.43; 42.58. Ano: 2008 URL: http://www.repository.naturalis.nl/record/449548 Phylogenetic utility of the AP3/DEF K-domain and its molecular evolution in Impatiens (Balsaminaceae) Naturalis Janssens, S.; Geuten, K.; Viaene, T.; Yong-Ming, Y.; Yi, S.; Smets, E.. APETALA3 (AP3)/DEFICIENS (DEF) is a MADS-box transcription factor that is involved in establishing the identity of petal and stamen floral organs. The AP3/DEF gene lineage has been extensively examined throughout the angiosperms in order to better understand its role in floral diversity and evolution. As a result, a large number of cloned AP3/DEF orthologues are available, which can be used for the design of taxon specific primers for phylogeny reconstruction of close relatives of the group of interest. Following this reasoning, we investigated the phylogenetic utility of the two AP3/DEF paralogues (ImpDEF1 and ImpDEF2) that were recently identified in the genus Impatiens (Balsaminaceae). K-domain introns 4 and 5 of both AP3/DEF duplicates were amplified... Tipo: Article / Letter to the editor Palavras-chave: APETALA3/DEFICIENS; Gene duplication; Impatiens; ImpDEF1; ImpDEF2; K-domain; Phylogenetic utility; 42.48. Ano: 2007 URL: http://www.repository.naturalis.nl/record/422232 Petaloidy and petal identity MADS-box genes in the balsaminoid genera Impatiens and Marcgravia Naturalis Geuten, K.; Becker, A.; Kaufmann, K.; Caris, P.; Janssens, S.; Viaene, T.; Theißen, G.; Smets, E.. Impatiens and Marcgravia have striking morphological innovations associated with the flowers. One of the sepals in Impatiens is spurred and petaloid, while in Marcgravia the petals are fused into a cap and nectary cups are associated with the inflorescence. Balsaminaceae (Impatiens) and Marcgraviaceae have surprisingly been shown to be closely related, since both belong to the balsaminoid clade of Ericales (basal asterids). However, several thorough morphological studies thus far have not revealed shared derived characters (synapomorphies) that support a close relationship between these families. In the balsaminoid clade, transitions from entirely green flowers to flowers with heterotopic petaloid organs can be observed. The primary role of class B genes... Tipo: Article / Letter to the editor Palavras-chave: SEPALLATA3; Class B genes; Petal identity; MADS-box genes; Impatiens; Marcgravia. Ano: 2006 URL: http://www.repository.naturalis.nl/record/407348 Registros recuperados: 3 Primeira ... 1 ... Última

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