Abstract:
OBJECTIVES:To formulate an equation for fine mapping of disease loci under complex conditions and determine the marker-disease distance in a specific case using this equation. METHODS:Lewontin's linkage disequilibrium (LD) measure D' was used to formulate an equation for mapping disease genes in the presence of phenocopies, locus heterogeneity, gene-gene and gene-environment interactions, incomplete penetrance, uncertain liability and threshold, incomplete initial LD, natural selection, recurrent mutation, high disease allele frequency and unknown mode of inheritance. This equation was then used to determine the distance between a marker ( epsilon 4 within the apolipoprotein E gene, APOE) and Alzheimer's disease (AD) loci using published data. RESULTS:An equation was formulated for mapping disease genes under the above conditions.If these conditions are present but ignored, then recombination fraction theta between marker and disease loci will be either overestimated or estimated with little bias. Therefore, an upper limit of theta can be obtained. AD has been found to be associated with the marker allele epsilon 4 in Africans, Asians, and Caucasians. This suggests that the AD- epsilon 4 allelic LD predates the divergence of peoples occurring 100 000 years ago. With the age of AD- epsilon 4 allelic LD so estimated, the maximal distance was calculated to be 23.2 kb (mean 5.8 kb). CONCLUSIONS:(1) A method is developed for LD mapping of susceptibility genes. (2) A mutation within the APOE gene itself, among others, is responsible for the susceptibility to AD, which is supported by recent evidence from studies using transgenic mice.
journal_name
Chin Med J (Engl)journal_title
Chinese medical journalauthors
Gong G,Haynatzki G,Deng HW,Recker RR,Mordeson J,Cheng SC,Fong Nkeywords:
subject
Has Abstractpub_date
2002-08-01 00:00:00pages
1233-40issue
8eissn
0366-6999issn
2542-5641journal_volume
115pub_type
杂志文章abstract::To investigate the HBV infection and its replication in Chinese patients with chronic liver disease, polymerase chain reaction (PCR) was employed to detect hepatitis B virus DNA in sera of 410 patients with chronic liver disease and liver samples from 188 patients. The HBV DNA detectability in all serum samples was 58...
journal_title:Chinese medical journal
pub_type: 杂志文章
doi:
更新日期:1993-01-01 00:00:00
abstract:OBJECTIVE:To investigate the complications of laparoscopic cholecystectomy in China. METHODS:All Chinese articles about laparoscopic cholecystectomy published between April 1994 and November 1995 were identified through CMCC (Chinese Medical Computerized Contents). From more than 600 titles, 105 articles were screened...
journal_title:Chinese medical journal
pub_type: 杂志文章,评审
doi:
更新日期:1997-09-01 00:00:00
abstract:BACKGROUND:The effects of near-road pollution on lung function in China have not been well studied. We aimed to investigate the effects of long-term exposure to traffic-related air pollution on lung function, airway inflammation, and respiratory symptoms. METHODS:We enrolled 1003 residents aged 57.96 ± 8.99 years livi...
journal_title:Chinese medical journal
pub_type: 杂志文章
doi:10.4103/0366-6999.189923
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journal_title:Chinese medical journal
pub_type: 杂志文章
doi:10.4103/0366-6999.151669
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journal_title:Chinese medical journal
pub_type: 杂志文章,meta分析,评审
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journal_title:Chinese medical journal
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doi:
更新日期:2004-01-01 00:00:00
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pub_type: 杂志文章
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journal_title:Chinese medical journal
pub_type: 杂志文章
doi:10.1097/CM9.0000000000000885
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journal_title:Chinese medical journal
pub_type: 杂志文章
doi:
更新日期:2003-10-01 00:00:00
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journal_title:Chinese medical journal
pub_type: 杂志文章
doi:
更新日期:1992-10-01 00:00:00
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journal_title:Chinese medical journal
pub_type: 杂志文章,评审
doi:
更新日期:2007-12-05 00:00:00
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journal_title:Chinese medical journal
pub_type: 杂志文章
doi:
更新日期:1994-02-01 00:00:00
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journal_title:Chinese medical journal
pub_type: 杂志文章
doi:10.4103/0366-6999.211881
更新日期:2017-08-20 00:00:00
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journal_title:Chinese medical journal
pub_type: 杂志文章
doi:
更新日期:2012-10-01 00:00:00
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journal_title:Chinese medical journal
pub_type: 杂志文章
doi:
更新日期:2000-12-01 00:00:00
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journal_title:Chinese medical journal
pub_type: 临床试验,杂志文章
doi:10.4103/0366-6999.190682
更新日期:2016-10-05 00:00:00
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journal_title:Chinese medical journal
pub_type: 临床试验,杂志文章,随机对照试验
doi:
更新日期:2003-01-01 00:00:00
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journal_title:Chinese medical journal
pub_type: 杂志文章,随机对照试验
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journal_title:Chinese medical journal
pub_type: 杂志文章
doi:
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pub_type: 杂志文章
doi:10.4103/0366-6999.178955
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doi:
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journal_title:Chinese medical journal
pub_type: 杂志文章
doi:
更新日期:1999-12-01 00:00:00
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journal_title:Chinese medical journal
pub_type: 杂志文章
doi:
更新日期:2002-05-01 00:00:00
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journal_title:Chinese medical journal
pub_type: 杂志文章
doi:
更新日期:2001-05-01 00:00:00
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journal_title:Chinese medical journal
pub_type: 杂志文章
doi:
更新日期:2001-12-01 00:00:00
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pub_type: 杂志文章,评审
doi:10.4103/0366-6999.217092
更新日期:2017-11-05 00:00:00
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pub_type: 杂志文章
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更新日期:2012-03-01 00:00:00
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journal_title:Chinese medical journal
pub_type: 杂志文章
doi:
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