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Researchers Use RNA-amplicon Sequencing to Spot Differences in Celiac Disease Epitopes in Durum Wheat Varieties

Celiac.com 02/04/2014 - According to a new article by a team of researchers, not all gluten protein is created equal. That is, not all gluten proteins trigger an immune response in people with celiac disease.

Photo: CC--antonella_baccariaThe research team included Elma M.J. Salentijn, Danny G. Esselink, Svetlana V. Goryunova, Ingrid M. van der Meer, Luud J.W.J. Gilissen, and Marinus J.M. Smulders. They are variously affiliated with the Plant Research International in Wageningen, The Netherlands, and the Vavilov Institute of General Genetics at the Russian Academy of Sciences in Moscow, Russia.

Gluten proteins are the source of peptides that can trigger a T cell reaction in celiac disease patients, leading to inflammatory responses in the small intestine. Various peptides with three major T cell epitopes involved in CD are derived from alpha-gliadin fraction of gluten. Numerous factors are known to influence the immunogenicity of individual gene family members, as alpha-gliadins are encoded by a large multi-gene family and amino acid variation in the celiac disease epitopes. That means that some wheat strains are more likely to trigger celiac disease, and other are less likely.

Current commercial methods of gluten detection cannot tell the difference between immunogenic and non-immunogenic celiac epitope variants, and thus cannot accurately measure the overall celiac epitope load of a given wheat strain. Being able to tell the difference between what types of wheat have a lower likelihood to cause or trigger celiac disease is important to commercial wheat growers and producers.

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The team developed a 454 RNA-amplicon sequencing method for alpha-gliadin transcripts that includes the three major celiac disease epitopes and their variants. They used the method to screen 61 different durum wheat cultivars and accessions. They found a total of 304 unique alpha-gliadin transcripts, corresponding to a total of 171 ‘unique deduced protein fragments’ of alpha-gliadins.

They used the numbers of these fragments obtained in each plant to calculate quantitative and quantitative differences between the celiac epitopes expressed in the endosperm of these wheat plants. A small number of wheat plants showed a lower ratios of celiac epitope-encoding alpha-gliadin transcripts, though none were entirely free of celiac epitopes.

Dedicated 454 RNA-amplicon sequencing allows researchers to group wheat plants according to the genetic variation in alpha-gliadin transcripts, and to screen for plants which are potentially less likely to trigger or promote celiac disease.

The alpha-gliadin sequence database the team constructed will provide an important reference in proteomics analysis regarding the immunogenic potential of mature wheat grains.

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1 Response:

 
vazzzao
Rating: ratingfullratingfullratingfullratingfullratingfull Unrated
said this on
10 Feb 2014 1:45:58 PM PDT
Provides a great understanding why this disease kicked in at age 50.




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KathleenH, I swear by MatteosPizza and they make National Delivery. I have been known to buy them by the dozen. https://www.matteospizza.com/ BellaMonica's is not a bad corn based crust. By not bad I mean "suprisingly good" that can be bought at most grocery stores. Here is there ZIP locator page to see if they are carried in your local area. http://glutenfreepizza.typepad.com/gluten-free-pizza/where-to-find-bella-monica.html I hope this is helpful. posterboy,

Hey all--have Hashimoto's and am being worked up for epigastric discomfort and IBS like symptoms--- My blood work had an IgA within the lower end of normal range, negative TTG, but weakly positive DGP. My endoscopy showed a "nodular" duodenum with the biopsy stating there was "reactive lymphoid hyperplasia"... I have a follow-up with the GI in 3 weeks. Wondering about any help?

DH wasn't linked to celiacs until 1967 from my research...

I was at a used book sale yesterday and happened to see an old dermatological textbook. Of course the first thing I looked up was dh just to see what it had to say. What I read shocked me as well as scared me half to death. The description of dh was right on, severe itching, blistering, bilateral, arms/elbows etc. but there was no mention at all of celiac, wheat, gluten or anything along that line. The reason they gave for the cause of dh was "a manifestation of an internal cancer," and later it said it results from cancer, usually cancer of the ovaries or one other that I can't remember. Being a hypochondriac, this was about enough to put me into cardiac arrest. I looked at the publication date and it was printed in 1963 which really isn't all that far back. Has anyone else ever heard of this?? I thought by 1963 they were quite certain that dh was a form of celiac or did it come way after that? Sorry if I'm freaking anyone out by asking this. That's not my intent at all, but since cancer is one of my biggest fears I found this rather unsettling.

Feeneyja, This will be a little long but I will try to be brief as possible. See this discussion thread that talks about how Pellagra is often diagnosed as other disease's today because doctor's rarely recognize it today in a clinical setting. Pellagra's is described as the 3 D's if you don't count the 4th D of death if it goes long enough and is not diagnosed in a timely manner. Dementia (Neurological) Digestive (GI problems), Dermatitis issues (Ezcema, Psorsias, Acne etc.) According to mdguidelines website http://www.mdguidelines.com/pellagra indicates that quoting ?The diagnosis of pellagra is straightforward when the classic rash is present but may be elusive if there are only gastrointestinal and/or neurological manifestations.? And why I believe in many cases Pellagra goes undiagnosed today. Because doctor's have forgotten how it presents. A longer researcher article about the neurological presentations of pellagra mention the many ways a Niacin deficiency can present itself. Here is the link https://www.hindawi.com/journals/cggr/2012/302875/ and I will quote some of the neurological/dementia related symptom's of an undiagnosed pellagra patient. "Mental symptoms were wider than dementia, in that depression, fatigue, psychomotor retardation, mania, obsessions, and a whole range of psychoses with auditory and visual hallucinations were well described, along with personality change and sociopathic and drug and alcohol addictive behaviours. Panic disorders were seen as was a general inability to deal with physical or mental stress. Poor brain development such as hydrocephalus or cerebral palsy was also common. Acute delirium or even coma occurred, with some patients having myoclonus and other extrapyramidal signs reminiscent of the spongiform encephalopathies. The dementias of pellagra included features akin to Lewy body, Alzheimer?s, frontotemporal, vascular, and prion diseases. Parkinsonism was also common and a festinant gait was first described in pellagrins. Tremors of various descriptions, including asymmetric rest tremors, were noted and some patients had typical paralysis agitans. Pellagrins had a characteristic expressionless facies, so some signs of parkinsonism were present in most cases. Many features of pellagra closely resemble the nonmotor aspects of PD. The neurological manifestation did not stop there because other degenerative conditions, such as an amyotrophic lateral sclerosis-like picture, were described, with fasciculation of the tongue and upper and lower motor neuron signs. Cerebellar syndromes occurred and vertigo was frequent. Headaches, sensory and pain syndromes, epilepsy, and involuntary movements were noted as well as sleep disturbances. Cord lesions were also seen, as was optic atrophy, so there were multiple sclerosis (MS), like variants." It is me again. You can see the neurological symptom's of Pellagra are severe and wide ranging. Taking Niacinamide 3/day for 6 months can alleviate many of these symptom's if your daughter has subclinical pellagra and the doctor's don't know to look for it. I had deep depression for many, many years and I shudder to think now that only a Vitamin could of helped me 30+ years ago and the doctor's didn't know to look for it. Shoot it isn't just Niacin. All B-Vitamin's help your stress levels. IF you have stress B-Vitamins can help your stress levels. I take Folic Acid for Blood pressure problems and it keeps my BP with in a normal range. A article on celac.com discussed this topic in detail a few months ago. https://www.celiac.com/articles/24658/1/A-Differential-Diagnosis-How-Pellagra-Can-be-Confused-with-Celiac-Disease/Page1.html I hope it is helpful. Good luck on your continued journey. If you have never heard of Pellagra you are not alone. Dr. Heaney discusses why this is so in his online article Pellagra and the 4 D's. http://blogs.creighton.edu/heaney/2013/11/18/pellagra-and-the-four-ds/ If you don't have time to read the whole hindawi article I also suggest this shorter but informative blog about why a Niacin deficiency can cause dementia related conditions. https://pellagradisease.wordpress.com/ Then decide for yourself and your daughter's sake to decide whether to take Niacinamide or not to see if it helps the D's symptom's she is experiencing (Digestive, Dementia etc.) The International Journal of Celiac Disease makes note of this in their research that Pellagra could be contributing to symptom's being diagnosed as Celiac disease today instead of a possible (co-morbid) Pellagra that causes the same symptom's. When they discuss how Pellagra and Celiac disease are related (Co-Morbid) in a Celiac diagnosis are surprised to find that in 58% of Celiac's -- can also be diagnosed with Pellagra. See this link http://pubs.sciepub.com/ijcd/3/1/6/ Quoting 3. Pellagra and celiac disease "The two diseases can be connected in two aspects. 58% of pellagra patients were shown to have malabsorption and many had intestinal pathology on biopsies [36, 37]. Alternatively, Pellagra was described in celiac disease [38]. The skin manifestations in pellagra might have some additional etiologies, since multiple nutrient deficiencies are at the origin of the cutaneous manifestations in celiac disease. The following nutritional deficiencies inducing skin rashes, were describe in celiac disease: Zinc, Iron, Vitamin A, E, B12, niacin, folate, selenium and essential fatty acids [39, 40]." If one is being diagnosed incorrectly the other co-morbid conditions can continue to cause Celiac like symptom's. But if the majority of those who have been diagnosed as Celiac could be helped by taking Niacinamide I see no you reason you shouldn't try it. Or at least research it some more. Again good luck on your continued journey. 2 Timothy 2: 7 ?Consider what I say; and the Lord give thee understanding in all things? this included. Posterboy by the grace of God,