生物谷:來自冰島雷克雅未克市deCODE Genetics,Landspitali大學(xué)醫(yī)院的科學(xué)家與香港中文大學(xué)威爾親王醫(yī)院(Prince of Wales Hospital)等處的研究人員合作進行全基因組掃描分析,,發(fā)現(xiàn)了心房顫動(Atrial fibrillation,,AF)與4號染色體兩個序列突變之間的相關(guān)性,為進一步加深對AF患病遺傳與分子機制的了解提供了重要全面的資料,。這一研究成果公布在Nature網(wǎng)絡(luò)版上,。
心房顫動(Atrial fibrillation,AF)簡稱房顫,是一種十分常見的心律失常,。據(jù)統(tǒng)計60歲以下的患病率為1%,,并隨年齡而增加。這種人類中最常見的持續(xù)性心律失常(cardiac arrhythmia)的發(fā)作呈陣發(fā)性或持續(xù)性,。房顫時,,心房內(nèi)激動傳導(dǎo)的方向不一致,頻率快而且不規(guī)整,,這使心房喪失了有效的收縮功能,。房顫時心房的激動頻率高達300~600次/分,雖然由于房室結(jié)的保護作用可使這些激動不能全部到達心室,,但是心室率(心率)仍然可達到100~160次/分,,不僅比正常竇性心律快得多,而且節(jié)律絕對不整齊,。
近期的研究證實了AF的遺傳來源,,并且發(fā)現(xiàn)了鉀離子通道(potassium-channel)基因與AF家族的聯(lián)系,但這只是引發(fā)AF的一小部分遺傳因素,。
在這篇文章中,,研究人員進行了一次全基因組掃描分析,并進一步在三個歐洲血統(tǒng)種群,,和一個中國香港種群中進行遺傳復(fù)制研究,,結(jié)果發(fā)現(xiàn)4號染色體(4q25)上的兩個序列突變(sequence variants)與AF有極大的相關(guān)性。其中歐洲血統(tǒng)35%的個體至少有一個突變,,每增加一個copy患上AF的幾率就會增加1.72和1.39,。而在中國人群中這一相關(guān)性更加明顯:75%的個體攜帶,AF患病風險增加1.42%,,同時患有典型性心房撲動(atrial flutter)的個體中也觀察到了更大的相關(guān)性,。
這兩個突變都與PITX2毗鄰,后者已知在心臟左右不對稱中扮演了一個關(guān)鍵的角色,。這一研究對于進一步加深對AF患病遺傳與分子機制的了解提供了重要全面的資料,,并且為AF類相關(guān)疾病的基因治療提出了新的靶標,。
原始出處:
Nature advance online publication 1 July 2007 | doi:10.1038/nature06007; Received 6 April 2007; Accepted 11 June 2007; Published online 1 July 2007
Variants conferring risk of atrial fibrillation on chromosome 4q25
Daniel F. Gudbjartsson1, David O. Arnar2, Anna Helgadottir1, Solveig Gretarsdottir1, Hilma Holm2, Asgeir Sigurdsson1, Adalbjorg Jonasdottir1, Adam Baker1, Gudmar Thorleifsson1, Kristleifur Kristjansson1, Arnar Palsson1, Thorarinn Blondal1, Patrick Sulem1, Valgerdur M. Backman1, Gudmundur A. Hardarson1, Ebba Palsdottir1, Agnar Helgason1, Runa Sigurjonsdottir2, Jon T. Sverrisson3, Konstantinos Kostulas4, Maggie C. Y. Ng5, Larry Baum5, Wing Yee So5, Ka Sing Wong5, Juliana C. N. Chan5, Karen L. Furie6, Steven M. Greenberg6, Michelle Sale6, Peter Kelly6, Calum A. MacRae7, Eric E. Smith6, Jonathan Rosand6, Jan Hillert4, Ronald C. W. Ma5, Patrick T. Ellinor7, Gudmundur Thorgeirsson2, Jeffrey R. Gulcher1, Augustine Kong1, Unnur Thorsteinsdottir1 & Kari Stefansson1
deCODE genetics, Sturlugata 8, 101 Reykjavik, Iceland
Division of Cardiology, Department of Medicine, Landspitali University Hospital, 101 Reykjavik, Iceland
Department of Medicine, Akureyri Regional Hospital, 600 Akureyri, Iceland
Department of Neurology, Karolinska Institutet at Karolinska University Hospital, Huddinge S-141 86, Sweden
Department of Medicine and Therapeutics, Prince of Wales Hospital, Chinese University of Hong Kong, Shatin, Hong Kong
Department of Neurology,
Cardiology Division and Cardiovascular Research Center, Massachusetts General Hospital and Harvard Medical School, Boston, Massachusetts 02114, USA
Correspondence to: Daniel F. Gudbjartsson1Kari Stefansson1 Correspondence and requests for materials should be addressed to D.F.G. (Email: [email protected]) or K.S. (Email: [email protected]).
Abstract
Atrial fibrillation (AF) is the most common sustained cardiac arrhythmia in humans and is characterized by chaotic electrical activity of the atria1. It affects one in ten individuals over the age of 80 years, causes significant morbidity and is an independent predictor of mortality2. Recent studies have provided evidence of a genetic contribution to AF3, 4, 5. Mutations in potassium-channel genes have been associated with familial AF6, 7, 8, 9, 10 but account for only a small fraction of all cases of AF11, 12. We have performed a genome-wide association scan, followed by replication studies in three populations of European descent and a Chinese population from Hong Kong and find a strong association between two sequence variants on chromosome 4q25 and AF. Here we show that about 35% of individuals of European descent have at least one of the variants and that the risk of AF increases by 1.72 and 1.39 per copy. The association with the stronger variant is replicated in the Chinese population, where it is carried by 75% of individuals and the risk of AF is increased by 1.42 per copy. A stronger association was observed in individuals with typical atrial flutter. Both variants are adjacent to PITX2, which is known to have a critical function in left–right asymmetry of the heart13, 14, 15.
附:
威爾斯親王醫(yī)院是一所分區(qū)急癥醫(yī)院,亦是香港中文大學(xué)教學(xué)醫(yī)院,于1984年啟用,座落沙田小瀝源,,是一間大型的急癥全科醫(yī)院,,亦是香港中文大學(xué)的教學(xué)醫(yī)院,肩負培訓(xùn)醫(yī)療人材及領(lǐng)導(dǎo)醫(yī)學(xué)研究的重要使命,。全院約有病床1,200張,,員工約3,500人,是新界東部的區(qū)域醫(yī)院,,服務(wù)范圍廣泛,,為沙田、大埔及北區(qū)的居民提供服務(wù),。
該院除了提供廿四小時急癥服務(wù)外,,并附設(shè)李嘉誠專科診所,,提供全面的專科門診服務(wù),。另外,,包玉剛爵士癌癥中心及包黃秀英女士兒童癌癥中心,于1994年11月正式啟用,,致力為病人提供最先進的癌癥治療服務(wù),,以及集中資源發(fā)展癌癥的研究及教育工作。
而賽馬會創(chuàng)傷及急癥中心于2002年3月正式啟用,,為受創(chuàng)傷及情況危急的病人提供綜合的緊急醫(yī)療服務(wù),。
威爾斯親王醫(yī)院是香港中文大學(xué)的教學(xué)醫(yī)院,肩負培訓(xùn)醫(yī)療人才及領(lǐng)導(dǎo)醫(yī)學(xué)研究的使命,。本院自創(chuàng)立至今已聯(lián)同香港中文大學(xué)培訓(xùn)了超過 2,306位醫(yī)生,,在學(xué)術(shù)交流及醫(yī)學(xué)研究方面更有卓越成就。雙方透過互相合作及協(xié)調(diào),,達至本院的宗旨:在病人全面護理,,醫(yī)護人員訓(xùn)練及醫(yī)學(xué)研究方面,提供最高質(zhì)素的服務(wù),。
此外,,透過雙方的合作,可以互相分享經(jīng)驗,、提高專業(yè)水平,,更可引進新科技、進行大型科研和進一步提升服務(wù)水平,。