An unusual posttranscriptional processing in two Betaine aldehyde dehydrogenase loci of cereal crops directed by short, direct repeats in response to stress conditions

文献类型： 外文期刊

第一作者： Zheng, Wenjing

作者： Zheng, Wenjing;Lu, Bao-Rong;Ren, Guangjun;Huang, Weizao;Wang, Songhu;Liu, Junli;Tang, Zizhi;Luo, Di;Wang, Yuguo;Liu, Yongsheng

作者机构：

关键词： RICE ORYZA-SATIVA;PRE-MESSENGER-RNA;GLYCINE BETAINE;CHOLINE MONOOXYGENASE;HIGHER-PLANTS;ESCHERICHIA-COLI;SALT-TOLERANCE;SUGAR-BEET;MOLECULAR-CLONING;OSMOTIC-STRESS

期刊名称：PLANT PHYSIOLOGY （ 影响因子：8.34； 五年影响因子：8.972 ）

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收录情况： SCI

摘要： Various abilities to synthesize and accumulate glycine betaine (GB) are crucial for angiosperms to develop salt and drought tolerances. In higher plants, GB is synthesized by a two-step oxidation of choline via an intermediate form of betaine aldehyde, and catalyzed by choline monooxygenase and betaine aldehyde dehydrogenase (BADH). In this study, numerous truncated and/or recombinant transcripts of two BADH homologs resulting from an unusual posttranscriptional processing were detected in rice (Oryza sativa) and other cereal crops, including maize (Zea mays), wheat (Triticum aestivum), and barley (Hordeum vulgare). The observed events took place at the 5' exonic region, and led to the insertion of exogenous gene sequences and a variety of deletions that resulted in the removal of translation initiation codon, loss of functional domain, and frameshifts with premature termination by introducing stop codon. By contrast, the BADH transcripts from dicotyledonous species, such as spinach (Spinacia oleracea), Arabidopsis (Arabidopsis thaliana), and tomato (Solanum lycopersicum), had correctly processed mRNA. This suggests the differentiation of posttranscriptional processing in BADH genes potentially contributes to the variation of GB-synthesizing capacities among various plant species. In addition, comprehensive sequence analyses demonstrated that extensive sequence similarities (named as short, direct repeats) are of paired presence surrounding the junctions of both the deletion and/or insertion sites in the unusual BADH transcripts. The site selection for the deletion/insertion was altered in response to the stress conditions. This indicates that the sequence elements of short, direct repeats are probably required for the recognition of the deletion/insertion sites.

分类号： Q945

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