The termini of a new citrus viroid contain duplications of the central conserved regions from two viroid groups

[摘要]

A citrus viroid associated with dwarfing, CVdIIIA, has been sequenced and its 294 nucleotide residues can be arranged to form the typical rod-like secondary structure of other viroids with 71% of nucleotides base-paired. CVdIIIA has greatest sequence similarity with apple scar skin viroid (ASSVd; 69%) and has the central sequence which is conserved in the ASSVd group. CVdIIIA is the smallest member of the ASSVd group but contains the terminal conserved region shared by all viroids over 300 nucleotides. The two ends of CVdIIIA are highly unusual in that each end appears to be derived from the conserved central core region of a different viroid group.

[学科分类] 生物化学/生物物理

[关键词] Viroid;Citrus;CVdIIIA;Conserved core sequence;Dwarfing;Nucleotide sequence;AGVd;Australian grapevine viroid;ASBVd;avocado sunblotch viroid;ASSVd;apple scar skin viroid;CBLVd;citrus bent leaf viroid;CBVd;Coleus blumei viroid;CCCVd;coconut cadangcadang viroid;CCR;central conserved region;CEVd;citrus exocortis viroid;CLVd;Columnea latent viroid;CSVd;chrysanthemum stunt viroid;CTIVd;coconut tinangaja viroid;CVdIIIA;citrus viroid IIIA;CVdIV;citrus viroid IV;GYSVdl;grapevine yellow speckle viroid 1;GYSVd2;grapevine yellow speckle viroid 2;HLVd;hop latent viroid;HSVd;hop stunt viroid;PBCVd;pear blister canker viroid;PLMVd;peach latent mosaic viroid;PSTVd;potato spindle tuber viroid;TASVd;tomato apical stunt viroid;TCR;terminal conserved region;TPMVd;tomato planta macho viroid