Navigation Links
Mysterious esophagus disease is autoimmune after all
Date:7/29/2014

Achalasia is a rare disease it affects 1 in 100,000 people characterized by a loss of nerve cells in the esophageal wall. While its cause remains unknown, a new study by a team of researchers at KU Leuven in Belgium, the University of Bonn in Germany and other European institutions confirms for the first time that achalasia is autoimmune in origin. The study, published on 6 July in Nature Genetics, is an important step towards unraveling the mysterious disease.

When we swallow, a sphincter in the lower esophagus opens, allowing food to enter the stomach. Nerve cells in the esophageal wall control the opening and closing of this sphincter, but in people with achalasia, these nerve cells gradually disappear. Without these cells, the esophageal sphincter fails to relax, causing food to accumulate in the esophagus. This results in swallowing problems, regurgitation, vomiting, nighttime coughing, chest pain and weight loss.

Because so little is known about achalasia, current treatments are limited to stretching the esophageal sphincter endoscopically with a balloon or surgically cutting the sphincter. But while these treatments can help alleviate the disease's symptoms, they do not address its cause.

Researchers have long suspected that an autoimmune response lies at the root of the disease, but an explanation for why the immune system of people with achalasia responds as it does remains elusive.

One possible explanation is that esophageal nerve cells are targeted by the body's defenses due to a miscued immune response to an earlier viral infection the immune system mistakes the nerve cells for the virus and attacks them.

Based on their results, the researchers in this study now think that genetics may play a more important role than previously thought in determining who is at risk for achalasia. Because the disease is so rare, cohorts in previous genetic studies have been too small (less than 300 patients) to draw significant conclusions.

Together with German colleagues, researchers at KU Leuven studied the DNA of 1,506 achalasia patients and 5,832 healthy volunteers from Central and Southern Europe. The study is the first systematic, genome-wide association study on achalasia and involves the largest cohort ever analyzed for the disease.

The researchers genotyped 196,524 tiny differences called single-nucleotide polymorphisms, or SNPs, pronounced 'snips' in the immune-related DNA of people with achalasia, and compared the results with the DNA of the healthy volunteers. 33 SNPs were found to be associated with achalasia.

Surprisingly, all 33 were located in the so-called 'major histocompatibility complex' (MHC) region of chromosome 6, the most gene-dense region in the human genome. This region is also known to be associated with other autoimmune disorders, including multiple sclerosis, type 1 diabetes and lupus. This evidence was enough for the researchers to confirm that achalasia is itself an autoimmune disease.

The researchers also pinpointed a specific string of amino acids inserted in the DNA of people with achalasia but not in the controls. The string, 8-amino acids long, is located in the cytoplasmic tail of HLA DQβ1. Moving forward, the researchers will examine the functional effects of these extra amino acids in the hope of finding the cause, and eventually the cure, of this enigmatic disease.


'/>"/>

Contact: Guy Boeckxstaens
guy.boeckxstaens@med.kuleuven.be
32-473-678-009
KU Leuven
Source:Eurekalert

Related biology news :

1. Life cycles of mysterious Namibian grassland fairy circles characterized
2. Gene discovery set to help with mysterious paralysis of childhood
3. Mysterious snake disease decoded
4. Nunavuts mysterious ancient life could return by 2100
5. Synchrotron infrared unveils a mysterious microbial community
6. Researchers id queens, mysterious disease syndrome as key factors in bee colony deaths
7. The mysterious GRIN3A and the cause of schizophrenia
8. Astronomer gets grant to better measure mysterious black holes
9. Mysterious catalyst explained
10. The mysterious scarab beetles: 2 new species of the endangered ancient genus Gyronotus
11. NIH grant funds multi-center study of mysterious trauma-induced hemorrhaging
Post Your Comments:
*Name:
*Comment:
*Email:
(Date:6/23/2017)... ITHACA, N.Y. , June 23, 2017 ... a leader in dairy research, today announced a new ... help reduce the chances that the global milk supply ... this dairy project, Cornell University has become the newest ... Food Supply Chain, a food safety initiative that includes ...
(Date:5/6/2017)... 2017 RAM Group , Singaporean ... breakthrough in biometric authentication based on a ... to perform biometric authentication. These new sensors are based ... by Ram Group and its partners. This sensor will ... chains and security. Ram Group is a next ...
(Date:4/13/2017)... 13, 2017 UBM,s Advanced Design and Manufacturing ... feature emerging and evolving technology through its 3D Printing ... run alongside the expo portion of the event and ... demonstrations focused on trending topics within 3D printing and ... manufacturing event will take place June 13-15, 2017 at the ...
Breaking Biology News(10 mins):
(Date:10/10/2017)... BARBARA, CALIFORNIA (PRWEB) , ... October 10, 2017 ... ... management, technological innovation and business process optimization firm for the life sciences and ... BoxWorks conference in San Francisco. , The presentation, “Automating GxP Validation ...
(Date:10/9/2017)... ... October 09, 2017 , ... The award-winning American Farmer television ... quarter 2018. American Farmer airs Tuesdays at 8:30aET on RFD-TV. , With global ... the challenge of how to continue to feed a growing nation. At the same ...
(Date:10/9/2017)... ... October 09, 2017 , ... ... medical journal, Epilepsia, Brain Sentinel’s SPEAC® System which uses the surface electromyography ... generalized tonic-clonic seizures (GTCS) using surface electromyography (sEMG). The prospective multicenter phase ...
(Date:10/7/2017)... Mass. , Oct. 6, 2017  The ... work of three scientists, Jacques Dubochet, Joachim ... breakthrough developments in cryo-electron microscopy (cryo-EM) ... technology within the structural biology community. The winners ... Scientists can now routinely produce highly resolved, three-dimensional ...
Breaking Biology Technology: