Isolation and characterization of reverse transcriptase fragments of LTR retrotransposons from the genome of Chenopodium quinoa AmaranthaceaeReportar como inadecuado

Isolation and characterization of reverse transcriptase fragments of LTR retrotransposons from the genome of Chenopodium quinoa Amaranthaceae - Descarga este documento en PDF. Documentación en PDF para descargar gratis. Disponible también para leer online.

Plant Cell Reports

, Volume 32, Issue 10, pp 1575–1588

First Online: 11 June 2013Received: 30 January 2013Revised: 30 April 2013Accepted: 28 May 2013


Key message High heterogeneity was observed among conserved domains of reverse transcriptase rt isolated from quinoa. Only one Ty1- copia rt was highly amplified. Reverse transcriptase sequences were located predominantly in pericentromeric region of quinoa chromosomes.

AbstractThe heterogeneity, genomic abundance, and chromosomal distribution of reverse transcriptase rt-coding fragments of Ty1-copia and Ty3-gypsy long terminal repeat retrotransposons were analyzed in the Chenopodium quinoa genome. Conserved domains of the rt gene were amplified and characterized using degenerate oligonucleotide primer pairs. Sequence analyses indicated that half of Ty1-copia rt 51 % and 39 % of Ty3-gypsy rt fragments contained intact reading frames. High heterogeneity among rt sequences was observed for both Ty1-copia and Ty3-gypsy rt amplicons, with Ty1-copia more heterogeneous than Ty3-gypsy. Most of the isolated rt fragments were present in quinoa genome in low copy numbers, with only one highly amplified Ty1-copia rt sequence family. The gypsy-like RNase H fragments co-amplified with Ty1-copia-degenerate primers were shown to be highly amplified in the quinoa genome indicating either higher abundance of some gypsy families of which rt domains could not be amplified, or independent evolution of this gypsy-region in quinoa. Both Ty1-copia and Ty3-gypsy retrotransposons were preferentially located in pericentromeric heterochromatin of quinoa chromosomes. Phylogenetic analyses of newly amplified rt fragments together with well-characterized retrotransposon families from other organisms allowed identification of major lineages of retroelements in the genome of quinoa and provided preliminary insight into their evolutionary dynamics.

KeywordsChenopodium quinoa In situ hybridization Reverse transcriptase Ty1-copia and Ty3-gypsy retrotransposons Communicated by R. Schmidt.

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Autor: Bozena Kolano - Edyta Bednara - Hanna Weiss-Schneeweiss


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