Arthrochalasia Ehlers-Danlos syndrome (aEDS) is a type of EDS characterized by frequent hip dislocations in addition to the more common EDS-associated symptoms of hypermobile joints. Skin-related symptoms are uncommon in this form of the disease.

Other names of aEDS include arthrochalasis multiplex congenita and Ehlers-Danlos syndrome type 7A (EDS7A).

What causes aEDS?

EDS is a result of insufficient levels or the improper functioning of collagen, the primary building block of connective tissue. Several types of collagen exist. Type 1 collagen is the most abundant in the body.

There are multiple types of mutations affecting collagen differently and causing 13 types of EDS. aEDS is caused by mutations in the COL1A1 or the CO1LA2 genes that carry instructions to make the amino acid chains that make type 1 collagen.  These mutations disrupt the normal structure of collagen and affect its function. As a result, tissues rich in type 1 collagen, including the connective tissues, are weakened, causing the symptoms of aEDS.

How is aEDS inherited?

Both COL1A1 and COL1A2 genes are located on chromosomes that do not determine gender (also known as autosomes). The COL1A1 gene is located on chromosome 17, while COL1A2 is located on chromosome 7.

There are two copies of every gene present on the autosomes, one from each parent. aEDS is inherited in an autosomal dominant manner, which means that only one copy of the gene needs to be mutated for the disease to develop. So, there is a 50% chance for a person with aEDS to pass the disease to their child.

In some cases, aEDS-causing mutations can occur in an individual even when their parents do not carry the genetic mutation. Such first occurrence of genetic changes is called a de novo mutation.

What are the symptoms of aEDS?

The severity and incidence of aEDS symptoms vary among patients. Some reported symptoms include:

How is aEDS diagnosed?

A doctor may suspect EDS based on a patient’s symptoms, family medical history, and physical exams.

Due to the significant overlap of symptoms between the different types of EDS, skin biopsy and genetic testing may be recommended to confirm aEDS.

How is aEDS treated?

Treatments of EDS mostly focus on alleviating symptoms and preventing  further complications.

Physiotherapy and the use of assistive devices in consultation with trained physical and occupational therapists may be recommended to improve movement and joint stability.

In severe cases of hip dislocation and curved spine, surgery may be required to correct the defect.

Last updated: Oct. 30, 2019

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Ehlers-Danlos News is strictly a news and information website about the disease. It does not provide medical advice, diagnosis, or treatment. This content is not intended to be a substitute for professional medical advice, diagnosis, or treatment. Always seek the advice of your physician or other qualified healthcare providers with any questions you may have regarding a medical condition. Never disregard professional medical advice or delay in seeking it because of something you have read on this website.

Vijaya Iyer is a freelance science writer for BioNews Services. She has contributed content to their several disease-specific websites, including cystic fibrosis, multiple sclerosis, muscular dystrophy, among others. She holds a PhD in Microbiology from Kansas State University, where her research focused on molecular biology, bacterial interactions, metabolism, and animal models to study bacterial infections. Following the completion of her PhD, Dr. Iyer went on to complete three postdoctoral fellowships at Kansas State University, University of Miami and Temple University. She joined BioNews Services to utilize her scientific background and writing skills to help patients and caregivers remain abreast with important scientific breakthroughs.
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Özge has a MSc. in Molecular Genetics from the University of Leicester and a PhD in Developmental Biology from Queen Mary University of London. She worked as a Post-doctoral Research Associate at the University of Leicester for six years in the field of Behavioural Neurology before moving into science communication. She worked as the Research Communication Officer at a London based charity for almost two years.
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Vijaya Iyer is a freelance science writer for BioNews Services. She has contributed content to their several disease-specific websites, including cystic fibrosis, multiple sclerosis, muscular dystrophy, among others. She holds a PhD in Microbiology from Kansas State University, where her research focused on molecular biology, bacterial interactions, metabolism, and animal models to study bacterial infections. Following the completion of her PhD, Dr. Iyer went on to complete three postdoctoral fellowships at Kansas State University, University of Miami and Temple University. She joined BioNews Services to utilize her scientific background and writing skills to help patients and caregivers remain abreast with important scientific breakthroughs.
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