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      Frequently Asked Questions About Celiac Disease   04/24/2018

      This Celiac.com FAQ on celiac disease will guide you to all of the basic information you will need to know about the disease, its diagnosis, testing methods, a gluten-free diet, etc.   Subscribe to Celiac.com's FREE weekly eNewsletter   What is Celiac Disease and the Gluten-Free Diet? What are the major symptoms of celiac disease? Celiac Disease Symptoms What testing is available for celiac disease?  Celiac Disease Screening Interpretation of Celiac Disease Blood Test Results Can I be tested even though I am eating gluten free? How long must gluten be taken for the serological tests to be meaningful? The Gluten-Free Diet 101 - A Beginner's Guide to Going Gluten-Free Is celiac inherited? Should my children be tested? Ten Facts About Celiac Disease Genetic Testing Is there a link between celiac and other autoimmune diseases? Celiac Disease Research: Associated Diseases and Disorders Is there a list of gluten foods to avoid? Unsafe Gluten-Free Food List (Unsafe Ingredients) Is there a list of gluten free foods? Safe Gluten-Free Food List (Safe Ingredients) Gluten-Free Alcoholic Beverages Distilled Spirits (Grain Alcohols) and Vinegar: Are they Gluten-Free? Where does gluten hide? Additional Things to Beware of to Maintain a 100% Gluten-Free Diet What if my doctor won't listen to me? An Open Letter to Skeptical Health Care Practitioners Gluten-Free recipes: Gluten-Free Recipes
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    Understanding the Genetics of Gluten Sensitivity by Dr. Scot Lewey


    Dr. Scot Lewey


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    This article appeared in the Summer 2006 edition of Celiac.coms Scott-Free Newsletter.

    Celiac.com 08/31/2006 - All of us have patterns of proteins on the surface of our white blood cells. These proteins are known as human leukocyte antigens (HLA), one of which is DQ. Celiac disease and non-celiac gluten sensitivity (NCGS), and several autoimmune conditions occur more frequently with certain HLA DQ types. DQ gene testing is performed by analyzing cells from a blood sample or from a Q-tip swab of the mouth. HLA types have a naming system that can be confusing even to scientists and physicians but here is my explanation of the testing, the results, and what they may mean to you and your family.

    Each of us has two copies of HLA DQ. Because there are 9 serotypes of DQ we are all DQx/DQx where x is a number between 1 & 9. For example, I am DQ2/DQ7. I received the DQ2 from one of my parents and the DQ7 from the other. Because we get one DQ type from each of our parents and give one to each of our children it is easy to to see how the DQ genes pass through a family. This is important because two DQ types, DQ2 and DQ8, are estimated to be present in over 98% of all people who have celiac disease, the most severe form of gluten sensitivity.

    Rarely, true celiac disease or dermatitis herpetiformis, the skin disease equivalent of celiac, have been reported to occur in people who do not have DQ2 and/or DQ8. However, according to unpublished data from Dr. Ken Fine of Enterolab, the other six types, except DQ4, are associated with risk for elevated stool antibodies to gliadin, the toxic fraction of gluten, and/or tissue transglutaminase (tTG) an enzyme. Both of these antibodies are usually elevated in the blood of individuals with celiac disease though they may be normal in the blood of individuals who are gluten sensitive and have a normal small intestine biopsy but respond favorably to a gluten-free diet.

    Fine has publicly reported that elevated stool antibodies to gliadin and/or tTG have been detected in all of the untreated celiacs tested in his lab and 60% of non-celiacs who have symptoms consistent with gluten sensitivity but in none of the controls tested including cow manure. Follow up surveys of those individuals with elevated stool antibodies who initiated a gluten-free diet compared with those with elevated antibodies who did not reportedly showed significantly improved quality of life and improved symptoms in the gluten-free group.

    He also reported DQ2 and DQ8 positive individuals have had, as a rule, the highest elevations of stool gliadin antibody followed by those who are DQ7 positive. Only those who are doubly positive for DQ4 have not been found to have significantly elevated antibodies to indicated gluten sensitivity. This is consistent with the differences in prevalence rates of celiac disease seen in various parts of the world since DQ4 is not generally found in Caucasians of Northern European ancestry where celiac incidence is highest but in those from Asia or Southern Africa where there is a very low incidence of celiac disease and gluten intolerance.

    DQ2 & DQ8, the two major types present in 90-99% of people who have celiac disease, are present in approximately 35-45% of people in the U.S., especially those of Caucasian race of Northern European ancestry, with highest risk of celiac disease but the prevalence in U.S. of celiac disease is 1%. Though a prevalence of 1 in 100 is very common and much higher than had been believed for years, only a fraction of the genetically at risk are confirmed to have celiac disease by abnormal blood tests and small intestine biopsies. However, the number of people who report a positive response to gluten-free diet is much higher.

    The stool antibody tests results would support this and the concept of a spectrum of gluten sensitivity that is much broader and in need of better diagnostic definitions. I am an example of someone who is DQ2/DQ7 who has normal blood tests for celiac disease but abnormal stool antibody tests and symptoms that responded to gluten-free diet. The strict criteria for diagnosing celiac disease, which is abnormal blood tests and a characteristic small intestine biopsy showing classic damage from gluten, is much narrower than what is being seen clinically.

    It is becoming obvious to many of us who have personal and professional medical experience with gluten intolerance and celiac disease that the problem of gluten sensitivity is much greater and extends beyond the high risk celiac genes DQ2 and DQ8. Traditionally it is reported and believed by many that if you are DQ2 and DQ8 negative you are unlikely to have celiac disease or ever develop it, though this cannot be said with 100% certainty especially since there are documented cases of celiac disease and the skin equivalent of celiac disease, known as dermatitis herpetiformis (DH) in individuals who are DQ2 and DQ8 negative.

    Therefore, knowing your DQ specific serotype pattern may be helpful for several reasons. For example, if you have more than one copy of DQ2 or DQ8, you carry two of the major genes. For example, if you are DQ2/DQ2, DQ2/DQ8, or DQ8/DQ8, a term Scott Adams of www.celiac.com has dubbed a "super celiac" you may be at much higher risk for celiac disease and have more severe gluten sensitivity. Certainly if you are DQ2 and/or DQ8 positive you are at increased risk for celiac disease. After a single copy of DQ2 or DQ8, it appears that DQ7/DQ7 might be next highest risk. Dr. Fine has also noted some other associations of the DQ patterns with microscopic or collagenous colitis, neurologic manifestations of gluten sensitivity and dermatitis herpetiformis, which has been one of the gluten sensitive conditions noted to be, at times, occurring in DQ2, DQ8 negative individuals.

    Why some people get celiac Disease or become gluten sensitive is not well understood but certain factors are believed to include onset of puberty, pregnancy, stress, trauma or injury, surgery, viral or bacterial infections including those of the gut, medication induced gut injury or toxicity e.g. non-steroidal anti-inflammatory medications such as aspirin, ibuprofen, etc., immune suppression or autoimmune diseases especially since several of those factors are associated with onset or unmasking of gluten sensitivity in someone who is at risk or not manifesting any recognizable symptoms. There is also well known group of individuals who are termed "latent" celiacs. They are at high risk because they have close relatives who have celiac disease with whom they share one or more of the celiac genes DQ2 and/or DQ8 though they usually have few or no symptoms but sometimes have abnormal blood tests and/or biopsies indicating possible or definite celiac disease. Others have negative blood tests and normal biopsies but symptoms that respond to a gluten-free diet.

    The severity of the sensitivity to gluten appears to be related to the DQ type, family history (highest risk is in the non affected identical twin of a celiac), pre-existing intestinal injury, degree of exposure to gluten (how frequent and large a gluten load an individual is exposed to), and immune status. Once initiated, gluten sensitivity tends to be life long. True celiac disease requires life-long complete gluten avoidance to reduce the increased risk of serious complications of undiagnosed and untreated celiac such as severe malabsorption, cancers, especially of the GI tract and lymphoma, other autoimmune diseases and premature death due to these complications.

    Again, DQ testing can be done with cells from blood or by a swab of the inside of the mouth but not all labs test for or report the full DQ typing but only the presence or absence of DQ2 and DQ8. The lab that performs DQ testing is usually determined by an individual insurance company on the basis of contracts with specific commercial labs. However, if your insurance contracts with Quest Labs or the Laboratory at Bonfils (Denver, CO) full DQ can be done if ordered and authorized by the insurance company.

    For those willing to pay out of pocket, Bonfils performs full DQ testing for Enterolab (www.enterolab.com) on a sample obtained by a Q tip swab of the mouth. Since it is painless and non-invasive it is well tolerated especially by young children. Also because the testing can be ordered without a physician and the sample obtained in their home using a kit obtained from Enterolab it is convenient. The kit is returned by overnight delivery by to Enterolab who forwards the test onto Bonfils. The cost is $149 for the genetic testing alone and has to be paid for in advance by credit card or money order and is generally not reimbursed by insurance.

    Enterolab also provides the stool testing for gliadin and tissue transglutaminase antibodies to determine if gluten sensitivity is evident. The gliadin antibody alone is $99 or the full panel includes genetic typing, stool testing for gluten and cows milk protein antibodies, and a test for evidence of malabsorption is $349.

    Again, the advantages of full DQ testing is determining if someone has more than one copy of DQ2 or DQ8 or carry both and therefore have a higher risk for celiac disease or more severe gluten intolerance. If you are DQ2 or DQ8 negative then your risk of celiac disease is low, though not non-existent. If you are not DQ4/DQ4 then you do have risk for gluten sensitivity. If you determine all DQ types within enough family members you can piece together a very accurate history of the origin of celiac and gluten sensitivity within a family and make some very accurate predictions of risk to other family members.

    Though the lay public and many clinicians are finding the genetic tests helpful, many, including most physicians, do not understand the genetics of gluten sensitivity. We are awaiting Dr. Fines published data on the significance of stool antibody tests and their association to the other DQ types as his lab is the only lab offering the stool antibody tests in the U.S. Other celiac researchers in U.S. have failed to reproduce his assay but scattered reports in the literature are appearing including a recent article in the British Medical Journal indicating stool antibody testing is feasible, non-invasive, and using their protocol, highly specific but not sensitive for celiac disease in children. (Editors note: When present, these antibodies indicate celiac disease. However, they are not present in many cases of celiac disease.)

    In the meantime, many patients are faced with the uncertainty and added cost of full DQ testing and stool testing due to the failure of traditional blood tests, small bowel biopsies, and the presence or absence of DQ2 and DQ8 to diagnose or exclude gluten sensitivity. Physicians unfamiliar with this testing are increasingly presented with the results and confused or skeptical pending published reports. The medical community continues to lack a consensus regarding the definitions of non-celiac gluten sensitivity and what tests justify recommendations for gluten-free diet. It is clear that gluten sensitivity, by any criteria, is much more common than ever thought and a hidden epidemic exists.

    Dr. Scot Lewey is a physician who is specialty trained and board certified in the field of gastroenterology (diseases of the digestive system) who practices his specialty in Colorado. He is the physician advisor to the local celiac Sprue support group and is a published author and researcher who is developing a web based educational program for people suffering from food intolerances, www.thefooddoc.com

    Article Source: EzineArticles.com


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    Guest Tommy Boan

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    I am glad to know that a physician understands this from real life experience. Thanks for sharing the info. I was recently in the hospital for microscopic colitis, per my GI doctor. They did a blood test and it said I am not a celiac patient anymore. I asked for a genetic test and it came back high risk...no gluten for me still.

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    Thank you for sharing your knowledge that regular medical doctors & insurance companies don't want to share with us, the patients who are self-employed & pay for all our own medical treatments. I've suffered w/ a variety of symptoms for 10+ years yet look healthy & trim outwardly. My pain is now spiked and I'm gonna do the genetic test. My naturopath tested our family and 4 of 5 of us are gluten sensitive, plus other grains too. After getting our results back, we'll try to get our parents to get tested too.

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    Thank you for the useful information. My daughter is DQ2/DQ8 but tested normal on her endoscopy. Although we were told at the time of the procedure that it was patchy and did not look good. I have been told she does not have celiac disease (my mom & i have celiac disease) and that she is gluten sensitive.

    My babygirl is only two & weighs next to nothing. We put her gluten-free and she did amazing well. Then the doctors asked us to return her to a regular diet so she could be tested. It was a hard decision but we did it. And now this result!

    Is this a normal situation? Do you have any suggestions for me as how I can help her be diagnosed properly?

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    Guest Julie Cottrell

    Posted

    Excellent article! My entire family (husband, me and our 2 boys) have been tested by Enterolab for gluten sensitivity. We all tested positive and have adopted gluten-free and mostly casein-free diets. I continue to seek information to justify what we are doing (it's tough to change your kid's diets!), especially in the face of those who question the validity of the tests (we didn't do blood tests or biopsies because they ARE more invasive, expensive and not very accurate!). I am a dietitian and have watched the evolution of diabetes diagnosis and how we now understand insulin sensitivity to fall on a spectrum....and I feel that gluten sensitivity may mimic that. Will be interesting to see how this all unfolds. I am considering the genetic testing now...thanks for the wonderful explanation of what to look for!

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    Scott Adams

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    Sources:
    ncbi.nlm.nih.gov  Celiac.com ncbi.nlm.nih.gov  mendfamily.com