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Genetic and Rare Diseases Information Center (GARD)


Other names people use for this condition
  • Homocystinuria due to cystathionine beta-synthase deficiency
  • Cystathionine beta-synthase deficiency
  • CBS deficiency
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Homocystinuria due to CBS deficiency
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Homocystinuria due to CBS deficiency is an inherited disorder in which the body is unable to process certain building blocks of proteins (amino acids) properly. This form of homocystinuria is caused by the lack of an enzyme called cystathionine beta-synthase, which results from a mutation in the CBS gene. It is characterized by dislocation of the lens in the eye, an increased risk of abnormal blood clots, and skeletal abnormalities. Problems with development and learning are also evident in some cases. Homocystinuria due to CBS deficiency is inherited in an autosomal recessive pattern.[1] Treatment aims to correct the biochemical abnormalities, especially to control blood homocystine concentration and prevent thrombosis (blood clots). Vitamin B6 (pyridoxine) therapy, protein-restricted and methionine-restricted diets, betaine treatment, and/or folate and vitamin B12 supplementation may be used to manage the condition.[2]




References
  1. Homocystinuria. Genetics Home Reference (GHR). 2008 Available at: http://www.ghr.nlm.nih.gov/condition=homocystinuria. Accessed March 16, 2011.
  2. Picker JD, Levy HL. Homocystinuria Cuased by Cystathionine Beta-Synthase Deficiency. GeneReviews. 2006 Available at: http://www.ncbi.nlm.nih.gov/books/NBK1524/. Accessed March 16, 2011.
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 General | Management Guidelines | Newborn Screening
More Detailed Information (Found 12 resources)
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  • General

    • Genetics Home Reference (GHR) contains information on Homocystinuria due to CBS deficiency. Click on the link to go to GHR and review the information.
    • Medscape Reference provides information on this topic. Click on the link to view this information. You may need to register to view the medical textbook, but registration is free.
    • The Online Mendelian Inheritance in Man (OMIM) database contains genetics resources that discuss Homocystinuria due to CBS deficiency. Click on the link to go to OMIM and review these resources.
    • Orphanet is a database dedicated to information on rare diseases and orphan drugs.  Access to this database is free of charge.  Click on the link to read information on this topic.
    • PubMed is a searchable database of medical literature and lists journal articles that discuss Homocystinuria due to CBS deficiency. Click on the link to view a sample search on this topic.
    • The Screening, Technology And Research in Genetics (STAR-G) Project has a fact sheet on this condition, which was written specifically for families that have received a diagnosis as a result of newborn screening. This fact sheet provides general information about the condition and answers questions that are of particular concern to parents. To view this fact sheet, click on the link.
  • Management Guidelines

    • GeneReviews provides current, expert-authored, peer-reviewed, full-text articles describing the application of genetic testing to the diagnosis, management, and genetic counseling of patients with specific inherited conditions. Click on the link to view the article on this topic.
  • Newborn Screening

    • An ACTion (ACT) sheet for this condition has been developed by experts in collaboration with the American College of Medical Genetics, an organization providing education, resources and a voice for the medical genetics profession. ACT sheets are general guidelines that describe the short-term actions a health professional should follow in talking with the family and deciding the appropriate steps in the follow-up of an infant who has screened positive on a newborn screening test. Click on the link above to view the ACT sheet.
    • An Algorithm for this condition has been developed by experts in collaboration with the American College of Medical Genetics, an organization providing education, resources and a voice for the medical genetics profession. Algorithms are general guidelines for healthcare providers outlining steps involved in determining the diagnosis of an infant who has screened positive on a newborn screening test. Click on the link above to view the Algorithm.
    • Baby's First Test is the nation's newborn screening education center for families and providers. This site provides information and resources about screening at the local, state, and national levels and serves as the Clearinghouse for newborn screening information.
    • The Newborn Screening Coding and Terminology Guide created by the National Library of Medicine (NLM) at the National Institutes of Health (NIH) promotes and facilitates the use of electronic health data standards in recording and transmitting newborn screening test results. The Web site includes standard codes and terminology for newborn tests and conditions for which they screen, and links to related sites. Click on the link to view details for this condition.
    • National Newborn Screening and Global Resource Center (NNSGRC) provides information and resources in the area of newborn screening and genetics to benefit health professionals, the public health community, consumers and government officials.
 Organizations Providing General Support | Social Networking Websites
Organizations (Found 5 resources)
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  • Organizations Providing General Support

  • Social Networking Websites

    • DNAandU.org is a Web site and blog that collects firsthand stories from people facing issues, making tough decisions, and using genomic (DNA) information in their own healthcare.  Click on the link to learn from their experiences and/or submit your own story.

    • Madisons Foundation
      P.O. Box 241956
      Los Angeles, CA 90024
      Telephone: 310-264-0826
      Fax: 310-264-4766
      E-mail: getinfo@madisonsfoundation.org  
      Web site: http://www.madisonsfoundation.org/  
    • RareShare is an online social hub dedicated to patients, families and healthcare professionals affected by rare medical disorders.
 
Medical Products (Found 1 resource)
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 Testing | Parent Resources
Services (Found 4 resources)
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    • Many individuals want to know about healthcare professionals or researchers who have knowledge of their conditions. When a condition is rare, it can be difficult to find someone who has seen many cases. Although there is no list of experts in rare diseases, GARD's How to Find an Expert fact sheet provides several ways to identify healthcare professionals who have experience with a particular condition. Click on the link to access this resource and learn more.

  • Testing

    • GeneTests lists laboratories offering clinical genetic testing for this condition. Clinical genetic tests are ordered to help diagnose a person or family and to aid in decisions regarding medical care or reproductive issues. Talk to your health care provider or a genetic professional to learn more about your testing options.
    • The Genetic Testing Registry (GTR) provides information about the genetic tests for this condition. The intended audience for the GTR is health care providers and researchers. Patients and consumers with specific questions about a genetic test should contact a health care provider or a genetics professional.
  • Parent Resources

    • The Parent Technical Assistance Center Network provides a list of the Parent Training and Information Centers in each state. These centers are funded by the United States Department of Education to provide early intervention and special education information and training to parents of children with disabilities from birth to age 26. Click on the link to find the Parent Center in your state.
 
Scientific Conferences (Found 4 resources)
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  • Past Conferences

    • RDCRN 3rd Conference on Clinical Research for Rare Diseases, October 2, 2012
      Location: Hilton Washington DC/Rockville Hotel & Executive Meeting Center, Rockville, MD
      Description: Clinical research in rare diseases presents a number of challenges and unique issues that are not usually considered in the training of clinical investigators through existing training programs. Goals of the conference include: direct instruction of trainees and new investigators in rare disease research methodology; development of a reusable curriculum/syllabus on rare disease research methodology; and stimulation of ideas regarding the unique issues facing investigators engaged in the study of rare diseases.
    • Newborn Screening in the Genomic Era: Setting a Research Agenda, December 13, 2010 - December 14, 2010
      Description: This meeting allowed leaders in the fields of genomics and newborn screening to learn from each other and together explore new ways to advance research on new genomic technologies, potential health applications for newborn screening and beyond, and related ELSI issues.
    • VI International Conference on Rare Diseases and Orphan Drugs (ICORD 2010): Global Approach to Accessibility in Rare Diseases, Orphan Drugs and Neglected Diseases , March 18, 2010 - March 20, 2010
      Location: Palais Rouge Convention Center, Palermo, Buenos Aires
      Description: For the first time, the VI International Conference on Rare Diseases and Orphan Drugs (ICORD 2010) was convened in the southern hemisphere in agreement with its aim of globalization of rare diseases research and orphan products development activities.
    • 25th Annual National Marfan Foundation Conference, August 6, 2009 - August 9, 2009
      Location: Mayo Clinic, Rochester, MN
      Description: Goals of this meeting were to (1) improve public awareness of Marfan syndrome; (2) improve patients’ knowledge of their condition and therapeutic options available to them (medical, social, and psychological); and (3) bring patients together with specialists from multiple disciplines including medical genetics, cardiology, cardiac surgery, orthopedics, and ophthalmology.
 
Clinical Trials & Research (Found 2 resources)
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    • NIH Clinical Trials and You is a website developed by the National Institutes of Health (NIH) to help people learn more about clinical trials, why they matter, and how to participate.
  • Patient Registry

    • ResearchMatch is a free national research registry designed to bring together patients, healthy volunteers and researchers. Anyone from the United States can register with ResearchMatch, and a parent, legal guardian, or caretaker may register on behalf of a volunteer. Researchers from participating institutions use the ResearchMatch database to search for patients or healthy volunteers who meet the study criteria. Many studies are looking for healthy people of all ages, while some are looking for people with specific illnesses. ResearchMatch was developed by major academic institutions across the country and is funded by the National Center for Advancing Translational Sciences.

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