Hydrops-ectopic calcification-moth-eaten skeletal dysplasia

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Hydrops-ectopic calcification-moth-eaten skeletal dysplasia
Synonyms	Greenberg dysplasia
Pronounce	N/A
Specialty	Medical genetics
Symptoms	Hydrops fetalis, ectopic calcification, moth-eaten appearance of bones
Complications	N/A
Onset	Prenatal
Duration	Lifelong
Types	N/A
Causes	Genetic mutation
Risks	Family history
Diagnosis	Radiographic imaging, genetic testing
Differential diagnosis	Thanatophoric dysplasia, osteogenesis imperfecta
Prevention	N/A
Treatment	Supportive care
Medication	N/A
Prognosis	Poor
Frequency	Extremely rare
Deaths	N/A

Hydrops-ectopic_calcification-moth-eaten_skeletal_dysplasia

Hydrops-ectopic calcification-moth-eaten skeletal dysplasia (HEM) is a rare genetic disorder that affects skeletal development.

Introduction

Hydrops-ectopic calcification-moth-eaten skeletal dysplasia, also known as HEM dysplasia, is an extremely rare skeletal disorder characterized by abnormal bone development. It falls under the category of osteochondrodysplasias, which are a group of genetic disorders affecting bone and cartilage growth.

Causes

HEM dysplasia is caused by mutations in the gene SLC29A3, which is responsible for encoding a protein called equilibrative nucleoside transporter 3 (ENT3). This protein plays a crucial role in the transport of nucleosides and nucleoside analog drugs across cell membranes. Mutations in the SLC29A3 gene disrupt the normal function of ENT3, leading to the characteristic features of HEM dysplasia.

Symptoms

The symptoms of HEM dysplasia can vary widely among affected individuals. Common features include severe growth retardation, short stature, and skeletal abnormalities. These skeletal abnormalities may include moth-eaten appearance of the bones, ectopic calcifications (calcium deposits in abnormal locations), and joint contractures. Other symptoms may include facial dysmorphism, intellectual disability, and hearing loss.

Diagnosis

Diagnosing HEM dysplasia can be challenging due to its rarity and variable presentation. A thorough clinical evaluation, including a detailed medical history and physical examination, is essential. Imaging studies such as X-rays, CT scans, and MRI scans can help identify the characteristic skeletal abnormalities associated with HEM dysplasia. Genetic testing to detect mutations in the SLC29A3 gene can confirm the diagnosis.

Treatment

Currently, there is no cure for HEM dysplasia. Treatment is mainly focused on managing the symptoms and improving the quality of life for affected individuals. This may involve a multidisciplinary approach, including orthopedic interventions to address skeletal abnormalities, physical therapy to improve mobility and joint function, and supportive care for associated complications such as hearing loss or intellectual disability.

Prognosis

The prognosis for individuals with HEM dysplasia can vary depending on the severity of symptoms and associated complications. Some individuals may have a milder form of the condition and lead relatively normal lives with appropriate management. However, severe cases of HEM dysplasia can be life-threatening, particularly if there are complications affecting vital organs or if respiratory difficulties arise due to chest deformities.

Research

Due to the rarity of HEM dysplasia, research on this condition is limited. However, ongoing studies are focused on understanding the underlying mechanisms of the disease and developing potential therapeutic interventions. Genetic counseling is also an important aspect of managing HEM dysplasia, as it can help affected individuals and their families understand the inheritance pattern and make informed decisions regarding family planning.

See also

• Osteochondrodysplasia
• Genetic counseling
• Orthopedic interventions
• Physical therapy

References

1. GeneReviews: Hydrops-Ectopic Calcification-Moth-Eaten Skeletal Dysplasia. Available at: [1] 2. Unger S, et al. HEM dysplasia: new radiological features. Am J Med Genet A. 2013;161A(8):2098-2108. 3. Campeau PM, et al. Mutations in KAT6B, Encoding a Histone Acetyltransferase, Cause Genitopatellar Syndrome. Am J Hum Genet. 2012;90(2):282-289.

External links

• National Organization for Rare Disorders (NORD) - HEM Dysplasia

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