The subtelomeric region of the Arabidopsis thaliana chromosome IIIR contains potential genes and duplicated fragments from other chromosomes.

Plant Molecular Biology
Chi-Ting WangChung-Mong Chen

Abstract

The subtelomere and a portion of the associated telomeric region (together named 3RTAS) of chromosome IIIR from the Arabidopsis thaliana ecotypes Columbia (Col) and Wassilewskija (Ws) were specifically amplified by polymerase chain reaction and subsequently cloned and sequenced. The centromere-proximal portion of 3RTAS from both ecotypes contained two newly identified potential genes, one encoding the chloroplast luminal 19-kDa protein precursor and the other encoding three potential alternatively spliced CCCH-type zinc finger proteins. The telomere-proximal portion of 3RTAS from the Col ecotype contained short duplicated fragments derived from chromosomes I, II, and III, and that from the Ws ecotype contained a duplicated fragment derived from chromosome V. Each duplicated fragment has diverged somewhat in sequence from that of the ectopic template. Small patches of homologous nucleotides were found within the flanking sequences of both the duplicated fragments and the corresponding ectopic template sequences. The structural characteristics of these duplicated fragments suggest that they are filler DNAs captured by non-homologous end joining during double-strand break repair. Our characterization of 3RTAS not only filled up a ...Continue Reading

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Citations

Mar 3, 2012·G3 : Genes - Genomes - Genetics·Giovana A TorresJiming Jiang
Jun 25, 2021·Nucleic Acids Research·Frédéric Chaux-JukicZhou Xu

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