Impaired autophagy of an intracellular pathogen induced by a Crohn's disease associated ATG16L1 variant.

Impaired autophagy of an intracellular pathogen induced by a Crohn's disease associated ATG16L1 variant.
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DOI:
10.1371/journal.pone.0003391
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发表时间:
2008
期刊:
影响因子:
3.7
通讯作者:
Xavier RJ
Xavier RJ
中科院分区:
综合性期刊3区
文献类型:
--
作者:
Kuballa P;Huett A;Rioux JD;Daly MJ;Xavier RJ

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使个体易患炎症性肠病的遗传风险因素开始被全基因组关联研究所破译。令人惊讶的是,这些新的数据指向自噬在克罗恩病发病机制中的关键作用。自噬蛋白ATG16L1中的单一常见编码变体使个体易于发展克罗恩病:而编码氨基酸位置300处的苏氨酸的ATG16L1(ATG16L1*300T)赋予保护,编码丙氨酸而不是苏氨酸的ATG16L1(ATG16L1*300A,也称为T300A)介导发展克罗恩病的风险。在这里,我们报告说,在人类上皮细胞中,克罗恩病相关的ATG16L1编码变异体显示出在自噬体内捕获内化沙门氏菌的损害。因此,我们认为ATG16L1*300A与克罗恩病风险增加的相关性是由于细菌处理受损和自噬细菌捕获率降低。
The genetic risk factors predisposing individuals to the development of inflammatory bowel disease are beginning to be deciphered by genome-wide association studies. Surprisingly, these new data point towards a critical role of autophagy in the pathogenesis of Crohn's disease. A single common coding variant in the autophagy protein ATG16L1 predisposes individuals to the development of Crohn's disease: while ATG16L1 encoding threonine at amino acid position 300 (ATG16L1*300T) confers protection, ATG16L1 encoding for alanine instead of threonine (ATG16L1*300A, also known as T300A) mediates risk towards the development of Crohn's disease. Here we report that, in human epithelial cells, the Crohn's disease-associated ATG16L1 coding variant shows impairment in the capture of internalized Salmonella within autophagosomes. Thus, we propose that the association of ATG16L1*300A with increased risk of Crohn's disease is due to impaired bacterial handling and lowered rates of bacterial capture by autophagy.
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