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Lethal and non-lethal diastrophic dysplasia. A study of 14 Swedish cases
Insights
Diastrophic dysplasia (DD) can present as a lethal variant in infants, characterized by low birth weight and specific skeletal abnormalities. This severe form is associated with respiratory and circulatory issues, distinguishing it from non-lethal DD cases.
Area of Science:
- Genetics and Developmental Biology
- Pediatric Orthopedics
- Clinical Genetics
Background:
- Diastrophic dysplasia (DD) is a rare autosomal recessive skeletal disorder.
- Understanding phenotypic variability in DD is crucial for diagnosis and management.
- Previous studies have described the clinical spectrum of DD, but a distinct lethal variant requires further characterization.
Observation:
- A clinical study involved 14 patients diagnosed with diastrophic dysplasia (DD).
- Six patients, including two sib pairs, exhibited a severe presentation leading to early death.
- These six infants presented with respiratory and circulatory insufficiency shortly after birth.
Findings:
- The six deceased infants are proposed to represent a distinct lethal variant of DD.
- Lethal DD cases showed significantly lower birth weight compared to non-lethal DD.
- Radiographic differences included joint overlap and cervical spine dislocation in all lethal cases; four also had congenital heart defects, absent in the non-lethal group.
Implications:
- Identification of a lethal DD variant aids in understanding genotype-phenotype correlations.
- Early recognition of this severe form can inform genetic counseling and prenatal diagnosis.
- Further research into the specific genetic and molecular mechanisms underlying this lethal variant is warranted.
Abstract:
A clinical study was performed on 14 patients with diastrophic dysplasia (DD), including three pairs of sibs. Six of these patients, including two pairs of sibs, died shortly after birth of respiratory and circulatory insufficiency. We consider these six patients to represent a special lethal variant of DD. In all infants with the lethal variant of DD the birth weight was lower than in those with the non-lethal variant. There were also roentgenological differences between these two groups. Overlapping in joints and dislocation of the cervical spine were seen in all the lethal cases. In addition, four of the six patients with lethal DD cases had a congenital heart defect, and none in the non-lethal group.
