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Title: The genome sequence of black cottonwood ( Populus trichocarpa ) reveals 18 conserved cellulose synthase ( CesA ) genes .
Author: Djerbi S Lindskog M Arvestad L Sterky F Teeri TT .
Journal: Planta Citation: V : 221 ( 5 ) P : 739-46 Year: 2005 Type: ARTICLE
Literature: oryza Field: abstract Doc ID: pub15940463 Accession (PMID): 15940463
Abstract: The genome sequence of Populus trichocarpa was screened for genes encoding cellulose synthases by using full-length cDNA sequences and ESTs previously identified in the it issue specific cDNA libraries of other poplars . The data obtained revealed 18 distinct CesA gene sequences in P trichocarpa . The identified genes were grouped in seven gene pairs , one group of three sequences and one single gene . Evidence from gene expression studies of hybrid aspen suggests that both copies of at least one pair , CesA3-1 and CesA3-2 , are actively transcribed . No sequences corresponding to the gene pair , CesA6-1 and CesA6-2 , were found in Arabidopsis or hybrid aspen , while one homologous gene has been identified in the rice genome and an active transcript in Populus tremuloides . A phylogenetic analysis suggests that the CesA genes previously associated with secondary cell wall synthesis originate from a single ancestor gene and group in three distinct subgroups . The newly identified copies of CesA genes in P trichocarpa give rise to a number of new questions concerning the mechanism of cellulose synthesis in trees .
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[ Sen. 4, subscore: 2.00 ]: Evidence from gene expression studies of hybrid aspen suggests that both copies of at least one pair , CesA3-1 and CesA3-2 , are actively transcribed .
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