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Genetic and environmental factors in hypospadias
Insights
Hypospadias prevalence is 2.89 per 1000 male newborns, with associated renal and urinary tract malformations. Low placental weight was the only correlated factor, with a 17% recurrence risk for brothers.
Area of Science:
- Pediatric Urology
- Medical Genetics
- Epidemiology
Background:
- Hypospadias is a common congenital anomaly affecting the male urethra.
- Understanding its etiology and recurrence risk is crucial for genetic counseling and public health.
- Previous studies have explored various risk factors with inconsistent findings.
Purpose of the Study:
- To investigate the prevalence of hypospadias in a defined population.
- To identify potential etiological factors and associated malformations.
- To determine the recurrence risk and heritability for genetic counseling.
Main Methods:
- A case-control study conducted in Alsace, France, from 1979 to 1987.
- Inclusion of 176 male infants diagnosed with hypospadias out of 60,847 live male births.
- Analysis of etiological factors, associated malformations, recurrence risk, and heritability.
Main Results:
- Prevalence of hypospadias was 2.89 per 1000 male newborns.
- 15.3% of affected infants had other malformations; 37.0% had renal/urinary tract anomalies.
- Low placental weight was the sole identified risk factor; recurrence risk for brothers was 17.0% (heritability 56.9%).
Conclusions:
- Hypospadias is associated with significant rates of other malformations, particularly renal and urinary.
- Limited etiological factors were identified, suggesting a complex multifactorial origin.
- High recurrence risk and heritability underscore the importance of genetic counseling for affected families.
Abstract:
A case control study of hypospadias was performed from 1979 to 1987 in Alsace, north-eastern France. A total of 176 out of 60 847 male infants had hypospadias giving a prevalence at birth of 2.89 per 1000 male newborns; 15.3% of all infants with hypospadias also had other malformations. Renal and urinary tract malformations were present in 37.0% of the infants with hypospadias and other additional malformations. None of the numerous aetiological factors which were studied was correlated with hypospadias except low weight of the placenta. The recurrence risk for brothers was 17.0% (an empirical risk of about 1 in 6) and the heritability coefficient was 56.9%. First degree relatives of infants with hypospadias had more malformations other than hypospadias than controls. These results have to be taken into consideration for genetic counselling.