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báo cáo khoa học: " Phenotypic instability of Arabidopsis alleles affecting a disease Resistance gene cluster"

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Tuyển tập báo cáo các nghiên cứu khoa học quốc tế ngành y học dành cho các bạn tham khảo đề tài: Phenotypic instability of Arabidopsis alleles affecting a disease Resistance gene cluster | BMC Plant Biology BioMed Central Research article Phenotypic instability of Arabidopsis alleles affecting a disease Resistance gene cluster Hankuil Yi and Eric J Richards Address Department of Biology Washington University One Brookings Drive St. Louis MO 63130 USA Email Hankuil Yi - hyi@artsci.wustl.edu Eric J Richards - richards@biology.wustl.edu Corresponding author Open Access Published 14 April 2008 Received 19 February 2008 BMC Plant Biology 2008 8 36 doi 10.1186 1471-2229-8-36 Accepted 14 April 2008 This article is available from http www.biomedcentral.cOm 1471-2229 8 36 2008 Yi and Richards licensee BioMed Central Ltd. This is an Open Access article distributed under the terms of the Creative Commons Attribution License http creativecommons.org licenses by 2.0 which permits unrestricted use distribution and reproduction in any medium provided the original work is properly cited. Abstract Background Three mutations in Arabidopsis thaliana strain Columbia - cpr1 sncl and bal - map to the RPP5 locus which contains a cluster of disease Resistance genes. The similar phenotypes gene expression patterns and genetic interactions observed in these mutants are related to constitutive activation of pathogen defense signaling. However these mutant alleles respond differently to various conditions. Exposure to mutagens such as ethyl methanesulfonate EMS and Y-irradiation induce high frequency phenotypic instability of the bal allele. In addition a fraction of the bal and cpr1 alleles segregated from bal X cpr1 F1 hybrids also show signs of phenotypic instability. To gain more insight into the mechanism of phenotypic instability of the bal and cpr1 mutations we systematically compared the behavior of these unusual alleles with that of the missense gain-of-function snc1 allele in response to DNA damage or passage through F1 hybrids. Results We found that the cpr1 allele is similar to the bal allele in its unstable behavior after EMS mutagenesis. For both the bal and cpr1

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