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Duchenne muscular dystrophy: systematic neonatal screening and earlier detection of carriers
Insights
Early screening for Duchenne muscular dystrophy (DMD) in newborns identifies affected boys and potential carriers. This neonatal screening program detects specific SCK increases, enabling early genetic information for at-risk families.
Area of Science:
- Biochemistry
- Genetics
- Pediatrics
Background:
- Duchenne muscular dystrophy (DMD) is a severe genetic disorder.
- Early detection is crucial for managing the disease and informing families.
Purpose of the Study:
- To evaluate the effectiveness of a systematic neonatal screening program for DMD.
- To assess the detection rate of DMD and identification of carriers.
Main Methods:
- Neonatal screening using creatine kinase (SCK) levels on dried blood spots.
- Diagnostic confirmation through EMG and muscle biopsy.
- Carrier identification via genealogical data analysis.
Main Results:
- Screening identified 12 cases of DMD among 71,091 boys (1 in 5,929 male births).
- A low false-positive rate of 1.6% was observed.
- 93 female relatives were identified as potential carriers, with 23 pre-symptomatic women receiving genetic information.
Conclusions:
- Systematic neonatal screening for DMD is effective in early diagnosis and carrier identification.
- The program allows for early genetic counseling, potentially reducing the incidence of DMD.
- Neonatal screening facilitates proactive management and family planning for DMD.
Abstract:
Systematic neonatal screening programme for DMD has been set up since June 1975. Constant and specific SCK increase in DMD newborn can be found on whole dried blood between the 5th and 8th day after birth. The amount of false positives is small : 1,6%. At the first control, DMD diagnosis is very probable and is made certain by EMG and muscle microscopic observations. For a period of 3 years and 6 months, we have achieved 138 579 screening tests, and 12 DMD were found, among 71 091 boys (1/5 929 male births). Genealogical data from 11 families out of the 12 lead to identify 93 women relatives as possible carriers; 23 of them are menstruating women who benefit by recognition and receive genetic information several years before the DMD clinical diagnosis in the first family's proband could have been done. Systematic neonatal screening programme for DMD seems to be a means to reduce the incidence of DMD to the theoretical mutation cases.