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    Are Celiac Disease Rates in China Higher Than Reported?


    Jefferson Adams

    Celiac.com 09/01/2014 - At present, the number of reported celiac disease cases in China is extremely low, and celiac disease is considered to be rare in that country. To determine the accuracy of this perspective, a team of researchers recently set out to compile an accurate estimate of rates of celiac disease in China.


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    Photo: Wikimedia Commons--Peter MorganThe research team included Juanli Yuan, Jinyan Gao, Xin Li, Fahui Liu, Cisca Wijmenga, Hongbing Chen, and Luud J. W. J. Gilissen. They are variously affiliated with the State Key Laboratory of Food Science and Technology, the College of Pharmaceutical Sciences, and the School of Life Sciences and Food Engineering, at Nanchang University in Nanchang, China, the Department of Genetics at the University Medical Centre Groningen of University of Groningen in Groningen, The Netherlands, with the Sino-German Joint Research Institute, Nanchang University, Nanchang, Jiangxi, China, and with the Plant Research International at Wageningen University & Research Centre in Wageningen, The Netherlands.

    The team reviewed the literature for certain and possible cases of celiac disease, the predisposing HLA allele frequencies, and information on gluten exposure in China. For the review, the team used the MEDLINE database, Chinese full-text databases CNKI, CBM, VIP and WANFANG, and two HLA allele frequency net databases, along with the Chinese Statistics Yearbook databases. They performed meta-analysis by analyzing DQ2, DQ8 and DQB1*0201 gene frequencies, and heterogeneity, in populations from different geographic regions and ethnicities in China.

    They found that frequencies of the HLA-DQ2.5 and HLA-DQ8 haplotypes were 3.4% (95% confidence interval 1.3–5.5%) and 2.1% (0.1–4.1%), respectively. HLA-DQ2 and HLA-DQ8 antigen frequencies were 18.4% (15.0–21.7%) and 8.0% (4.5–11.4%), respectively. The frequency of the DQB1*0201 allele was 10.5% (9.3–11.6%), and the allele was more common in the northern Chinese than in the southern Chinese individuals.

    HLA haplotype data, in conjunction with increasing wheat consumption, strongly suggest that rates of celiac disease are far higher in China than currently reported.

    The researchers suggest that the Chinese government, medical and agricultural research institutions, and food industries work together to increase awareness about celiac disease to prevent it from growing into a medical and societal burden.

    Source:


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    Wish they had also done a companion epidemiological study to confirm/compare to genetic data review results.

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  • About Me

    Jefferson Adams is a freelance writer living in San Francisco. He has covered Health News for Examiner.com, and provided health and medical content for Sharecare.com. His work has appeared in Antioch Review, Blue Mesa Review, CALIBAN, Hayden's Ferry Review, Huffington Post, the Mississippi Review, and Slate, among others.

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  • Related Articles

    Jefferson Adams
    Celiac.com 12/25/2013 - At present, the number of reported celiac disease cases is extremely low in China. 
    Until recently, celiac disease was considered to be rare in China. A team of researchers recently set out to compile an accurate estimate of rates of celiac disease in China.
    The research team included Juanli Yuan, Jinyan Gao, Xin Li, Fahui Liu, Cisca Wijmenga, Hongbing Chen, and Luud J. W. J. Gilissen. They are variously affiliated with the State Key Laboratory of Food Science and Technology, the College of Pharmaceutical Sciences, and the School of Life Sciences and Food Engineering, at Nanchang University in Nanchang, China, the Department of Genetics at the University Medical Centre Groningen ofUniversity of Groningen in Groningen, The Netherlands, with the Sino-German Joint Research Institute, Nanchang University, Nanchang, Jiangxi, China, and with the Plant Research International at Wageningen University & Research Centre in Wageningen, The Netherlands.
    The team used the MEDLINE database and four Chinese full-text databases (CNKI, CBM, VIP and WANFANG), as well as two HLA allele frequency net databases. along with the Chinese Statistics Yearbook databases, to review the literature for definite and suspected cases of celiac disease, the predisposing HLA allele frequencies, and information on gluten exposure in China.
    They performed meta-analysis by analyzing DQ2, DQ8 and DQB1*0201 gene frequencies and heterogeneity in populations from different geographic regions and ethnicities in China.
    They found that frequencies of the HLA-DQ2.5 and HLA-DQ8 haplotypes were 3.4% (95% confidence interval 1.3–5.5%) and 2.1% (0.1–4.1%), respectively. HLA-DQ2 and HLA-DQ8 antigen frequencies were 18.4% (15.0–21.7%) and 8.0% (4.5–11.4%), respectively.
    The frequency of the DQB1*0201 allele was 10.5% (9.3–11.6%), and the allele was more common in the northern Chinese than in the southern Chinese individuals.
    HLA haplotype data, in conjunction with increasing wheat consumption, strongly suggest that rates of celiac disease are far higher in China than currently reported.
    They suggest that the Chinese government, medical and agricultural research institutions, and food industries work together to increase awareness about celiac disease to prevent it from growing into a medical and societal burden.
    Source:
    PLOS ONE DOI: 10.1371/journal.pone.0081151

    Jefferson Adams
    Celiac.com 05/01/2014 - While estimates indicate that about 1% of the world's population is affected by celiac disease, it is thought to be uncommon in both India and Asia. However, very little study has been done on celiac disease in Asian nations.
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    All respondents who screened positive for any of the above factors, and 10% of screen negative individuals received blood tests for the anti-tissue transglutaminase antibody.
    Those with positive blood tests were invited to undergo further evaluation including endoscopic biopsy. Diagnosis for celiac disease was made on the basis of a positive blood test, the presence of villous atrophy and/or response to gluten free diet.
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    Source:
    J Gastroenterol Hepatol. 2011 May;26(5):894-900. doi: 10.1111/j.1440-1746.2010.06606.x.

    Jefferson Adams
    Celiac.com 07/16/2014 - Information about the number of cases and and overall rates of celiac disease and dermatitis herpetiformis in the UK have not been well studied over time, either by region or by age. Yet, this type of information is essential for determining potential causes and quantifying the impact of these diseases.
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    Source:
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