作者pathoman (青黏材菌)
看板Medicine
标题[病理] 偏头痛遗传研究
时间Thu May 29 18:24:03 2008
科研人员9日在《美国人类遗传学杂志》(The American Journal of Human
Genetics)发表论文报告了有关偏头痛遗传学的最新研究进展。
偏头痛是产生复发性头痛的最常见原因,也是目前为止求医的最常见的神经
学原因。它在欧洲影响了4100万、约15%的人口。它在发达国家和发展中国家
都对医疗保健造成了巨大的负担。在过去几年中,人们在对常见基因影响常
见疾病(包括糖尿病、克罗恩病和精神分裂症等)的易感性的研究中,取得
了长足的进展。但是,或许由于偏头痛显型的高度变异性和缺少可行的实验
室检验,科学家还没有确定与这种疾病易感性有关的基因。
芬兰赫尔辛基大学和英国Sanger研究所的Aarno Palotie教授说:“为了解决
这个问题,我们发明了一种针对偏头痛不同症状的新的分析技术。”利用该
技术,研究人员对来自210个芬兰和澳大利亚偏头痛家族中的1700名偏头痛患
者及家属进行了研究。此後,研究人员还分别进行了进行全基因组微卫星研
究和独立标靶复制研究。研究人员发现,位于染色体10q23处的基因位点,在
种群研究和复制研究中都有充分证据表明它存在遗传学关联。这个基因位点
与女性偏头痛患者的关联尤其强烈。Palotie小组的Verneri Anttila说:“
进一步的分析表明,此前的芬兰和澳大利亚的两项独立的研究,也能得出同
样的位点,但是那两项研究中的证据都并不充分,因此到目前为止这个联系
一直没被发现。”这个位点同4000个偏头痛患者及家属相联系。Palotie说:
“所有这些发现都得益于最新发现的偏头痛遗传学特征:不同种类的疼痛─
─如跳动疼和单边疼──是与产生疼痛的特定遗传学位点紧密相连的。”
在这项研究中,研究人员首次能够令人信服地证明一个基因位点在两个不同
的种群中和偏头痛易感性相联系。有趣的是芬兰人和澳大利亚人有很远的遗
传学距离,而这项研究把此前的两项研究联系起来,得出了精确定位易感区
域的有力证据。Palotie和Anttila说:“这项研究是目前为止的第一次国际
合作也是最大的偏头痛关联研究。它成功地使用新分析策略来探测位点,为
今後的大型合作研究铺平了道路。”他们认为,这项研究使人们更有望破译
偏头痛的路径,从而发现新的治疗目标和发现第一个偏头痛基因变量。
The American Journal of Human Genetics
Consistently Replicating Locus Linked to Migraine on 10q22-q23
Here, we present the results of two genome-wide scans in two
diverse populations in which a consistent use of recently
introduced migraine-phenotyping methods detects and replicates a
locus on 10q22-q23, with an additional independent replication. No
genetic variants have been convincingly established in migraine,
and although several loci have been reported, none of them has
been consistently replicated. We employed the three known
migraine-phenotyping methods (clinical end diagnosis, latent-class
analysis, and trait-component analysis) with robust multiple
testing correction in a large sample set of 1675 individuals from
210 migraine families from Finland and Australia. Genome-wide
multipoint linkage analysis that used the Kong and Cox exponential
model in Finns detected a locus on 10q22-q23 with highly
significant evidence of linkage (LOD 7.68 at 103 cM in
female-specific analysis). The Australian sample showed a LOD
score of 3.50 at the same locus (100 cM), as did the independent
Finnish replication study (LOD score 2.41, at 102 cM). In
addition, four previously reported loci on 8q21, 14q21, 18q12, and
Xp21 were also replicated. A shared-segment analysis of 10q22-q23
linked Finnish families identified a 1.6-9.5 cM segment, centered
on 101 cM, which shows in-family homology in 95% of affected
Finns. This region was further studied with 1323 SNPs. Although no
significant association was observed, four regions warranting
follow-up studies were identified. These results support the use
of symptomology-based phenotyping in migraine and suggest that the
10q22-q23 locus probably contains one or more migraine
susceptibility variants.
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