Corneal endothelial dystrophy type 2

Title

Other Names:

CHED2; Corneal dystrophy, congenital hereditary endothelial; Congenital hereditary endothelial dystrophy of the cornea; CHED2; Corneal dystrophy, congenital hereditary endothelial; Congenital hereditary endothelial dystrophy of the cornea; Maumenee corneal dystrophy See More

Categories:

Congenital and Genetic Diseases; Eye diseases

Summary Summary

The following summary is from Orphanet, a European reference portal for information on rare diseases and orphan drugs.

Orpha Number: 293603

Disease definition

Congenital hereditary endothelial dystrophy II (CHED II) is a rare subtype of posterior corneal dystrophy (see this term) characterized by a diffuse ground-glass appearance of the corneas and marked corneal thickening from birth with nystagmus, and blurred vision.

Epidemiology

Prevalence of this form of corneal dystrophy is unknown. Most cases have been identified in children of consanguineous parents from Saudi Arabia, India, Pakistan, Myanmar (Burma) and Ireland.

Clinical description

Diffuse ground glass lesions are present from birth and are accompanied by nystagmus. Tearing and photophobia are minimal or absent. The course is relatively stable. Patients also occasionally have sensorineural deafness. The cornea is swollen due to extensive stromal edema.

Etiology

Most cases are caused by homozygous mutations in the SLC4A11 gene. A high degree of mutational heterogeneity has been detected and genetic heterogeneity may exist as no mutations in SLC4A11 or in its promoter region have been detected in some affected families. In CHED II, an increased tendency for the abnormal endothelium to synthesize a homogenous, posterior, non-banded Descemet membrane is observed.

Genetic counseling

Transmission appears to be autosomal recessive.

Management and treatment

Patients with CHED II usually require a penetrating keratoplasty. Procedures for repairing the posterior surface of the cornea, such as a deep lamellar endothelial keratoplasty (DLEK), Descemet stripping endothelial keratoplasty (DSEK), or Descemet stripping automated endothelial keratoplasty (DSAEK) are technically difficult in young children.

Visit the Orphanet disease page for more resources.

Last updated: 5/1/2012

Symptoms Symptoms

The Human Phenotype Ontology (HPO) provides the following list of features that have been reported in people with this condition. Much of the information in the HPO comes from Orphanet, a European rare disease database. If available, the list includes a rough estimate of how common a feature is (its frequency). Frequencies are based on a specific study and may not be representative of all studies. You can use the MedlinePlus Medical Dictionary for definitions of the terms below.

Signs and Symptoms	Approximate number of patients (when available)
Autosomal recessive inheritance	-
Congenital corneal dystrophy	-
Opacification of the corneal stroma	-

Last updated: 10/1/2017

Inheritance Inheritance

Most cases of corneal endothelial dystrophy type 2 are caused by homozygous mutations in the SLC4A11 gene. The condition is transmitted in an autosomal recessive manner. This means that two unaffected parents each carry one copy of a gene mutation for the condition. Neither parent will show signs or symptoms of the condition because two copies are needed for the condition to occur. There have been several families with corneal endothelial dystrophy type 2 where no mutation was found in the SLC4A11 gene.^[1] To find laboratories offering genetic testing to confirm a diagnosis, please visit the Tests and Diagnosis section of the Web site. http://rarediseases.info.nih.gov/gard/6196/ched2/resources/12

Last updated: 3/21/2014

Diagnosis Diagnosis

Making a diagnosis for a genetic or rare disease can often be challenging. Healthcare professionals typically look at a person’s medical history, symptoms, physical exam, and laboratory test results in order to make a diagnosis. The following resources provide information relating to diagnosis and testing for this condition. If you have questions about getting a diagnosis, you should contact a healthcare professional.

Testing Resources

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.

Do you have updated information on this condition? Let us know.

Organizations Organizations

Support and advocacy groups can help you connect with other patients and families, and they can provide valuable services. Many develop patient-centered information and are the driving force behind research for better treatments and possible cures. They can direct you to research, resources, and services. Many organizations also have experts who serve as medical advisors or provide lists of doctors/clinics. Visit the group’s website or contact them to learn about the services they offer. Inclusion on this list is not an endorsement by GARD.

Organizations Supporting this Disease

Corneal Dystrophy Foundation
6066 McAbee Rd.
San Jose, CA 95120
Telephone: 866-807-8965
E-mail: execdir@cornealdystrophyfoundation.org
Website: http://www.cornealdystrophyfoundation.org

Do you know of an organization? Send us your suggestions.

Living With Living With

Living with a genetic or rare disease can impact the daily lives of patients and families. These resources can help families navigate various aspects of living with a rare disease.

Genetics Resources

To find a medical professional who specializes in genetics, you can ask your doctor for a referral or you can search for one yourself. Online directories are provided by GeneTests, the American College of Medical Genetics, and the National Society of Genetic Counselors. If you need additional help, contact a GARD Information Specialist. You can also learn more about genetic consultations from Genetics Home Reference.

Learn More Learn More

These resources provide more information about this condition or associated symptoms. The in-depth resources contain medical and scientific language that may be hard to understand. You may want to review these resources with a medical professional.

In-Depth Information

The Monarch Initiative brings together data about this condition from humans and other species to help physicians and biomedical researchers. Monarch’s tools are designed to make it easier to compare the signs and symptoms (phenotypes) of different diseases and discover common features. This initiative is a collaboration between several academic institutions across the world and is funded by the National Institutes of Health. Visit the website to explore the biology of this condition.
Online Mendelian Inheritance in Man (OMIM) is a catalog of human genes and genetic disorders. Each entry has a summary of related medical articles. It is meant for health care professionals and researchers. OMIM is maintained by Johns Hopkins University School of Medicine.
Orphanet is a European reference portal for information on rare diseases and orphan drugs. Access to this database is free of charge.
PubMed is a searchable database of medical literature and lists journal articles that discuss Corneal endothelial dystrophy type 2. Click on the link to view a sample search on this topic.

News & Events News & Events

News

Don’t Miss the NCATS Toolkit for Patient-Focused Therapy Development Event
August 31, 2017
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August 10, 2017

GARD Answers GARD Answers

Questions sent to GARD may be posted here if the information could be helpful to others. We remove all identifying information when posting a question to protect your privacy. If you do not want your question posted, please let us know. Submit a new question

My five month old daughter is being diagnosed with CHED type 2, however we have no family history of it. I need to find out more information about it with regards to spontaneous mutations that may lead to this rare genetic disorder and how we can get a confirmatory diagnosis. See answer

Have a question? Contact a GARD Information Specialist.

References References

Klintworth, G.. Congenital hereditary endothelial dystrophy type II. Orphanet. May 2012; http://www.orpha.net/consor/cgi-bin/OC_Exp.php?lng=EN&Expert=293603. Accessed 3/21/2014.

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