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Atelosteogenesis type 2

Atelosteogenesis type 2



Overview

Atelosteogenesis type 2 is a severe, rare genetic disorder of cartilage and bone development that is typically lethal around the time of birth.

Symptoms

Short limbs: Infants have severely shortened arms and legs (micromelia) due to underdevelopment of the bones.

Chest and abdomen: Affected babies typically present with a narrow, small chest alongside a prominent, rounded (protuberant) abdomen.

Cleft palate: There is an opening in the roof of the mouth.

Facial features: Distinctive or abnormal facial dysmorphism is common.

Foot deformities: Clubfoot (talipes equinovarus), where the foot turns inward and downward, frequently occurs.

Hand and foot positioning: Unusually positioned "hitchhiker" or abducted thumbs and toes are characteristic findings, along with gaps between the first and second toes and ulnar deviation of the fingers

Deficient ossification: Parts of the skeleton lack proper bone hardening and development. Spinal abnormalities: Findings include flattened vertebrae (platyspondyly), underdeveloped vertebrae, and cervical kyphosis (abnormal forward rounding of the neck spine). 

Respiratory failure: Due to the narrow, underdeveloped chest cavity, infants generally experience fatal breathing difficulties shortly after birth or are stillborn. 

Causes

Gene Function: The SLC26A2 gene provides instructions for making a protein that transports sulfate into developing cartilage cells. 

Sulfation Process: Sulfate is required for the normal chemical modification (sulfation) of proteoglycans, which are vital building blocks of cartilage. 

Disruption: Mutations in this gene disrupt sulfate uptake, impairing cartilage structure and preventing it from properly converting into bone. This leads to severe skeletal abnormalities like shortened limbs and a narrow chest. 

Autosomal Recessive: The condition is inherited in an autosomal recessive pattern, meaning a child must inherit two copies of the mutated gene (one from each carrier parent) to develop the disorder.

Carrier Parents: Parents of an affected individual are healthy carriers of a single altered gene copy and typically show no symptoms.

Diagnosis

Prenatal Ultrasonography: Detects skeletal abnormalities like severe limb shortening (micromelia), coronal clefts of the vertebrae, spinal deviations, and abducted "hitchhiker" thumbs or toes during pregnancy. 

Radiological Examination: Identifies specific bone and cartilage malformations, deficient skeletal ossification, and joint issues after birth. 

Histopathology: Examines cartilage tissue samples, which can help differentiate this condition from other skeletal dysplasias. 

Molecular Genetic Testing: Confirms the diagnosis by identifying biallelic pathogenic variants (mutations) in the SLC26A2 gene via blood or tissue sample analysis. 

Treatment

Supportive Care: Doctors provide breathing help, such as mechanical ventilation and neonatal resuscitation, because a narrow chest makes breathing very difficult. 

Palliative Care: Comfort care is offered when the condition is severe and life-prolonging treatment is not effective or chosen. Most babies with this condition are stillborn or pass away shortly after birth from respiratory failure. 

Type of Doctor Department :A pediatric neonatologist

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