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Recurrence risks for near relatives of children with sensori-neural deafness
D Koehn1, K Morgan, F C Fraser
1McGill Center for Human Genetics, Montreal, Canada.
Insights
The probability of a sibling having sensorineural deafness is 1 in 6. This study estimates recurrence risks and suggests 13 autosomal recessive loci contribute to this hearing loss.
Area of Science:
- Genetics
- Otolaryngology
- Pediatrics
Background:
- Sensorineural deafness is a significant cause of hearing loss in children.
- Identifying the genetic basis of non-syndromic sensorineural deafness is crucial for genetic counseling.
- Previous studies have explored various inheritance patterns but a comprehensive estimate for non-syndromic forms remains challenging.
Purpose of the Study:
- To estimate the recurrence risk of non-syndromic sensorineural deafness in families.
- To investigate the genetic contribution of autosomal recessive inheritance to sensorineural deafness.
- To provide data for genetic counseling regarding the likelihood of affected offspring.
Main Methods:
- Analysis of familial aggregation of sensorineural deafness in a cohort of children from The Montreal Children's Hospital.
- Calculation of sibling recurrence risk based on affected individuals.
- Estimation of recurrence risks for offspring using data from parental and sibling affectedness.
- Inclusion of French-Canadian families and a general sample to assess population-specific patterns.
Main Results:
- The probability of a sibling being affected with sensorineural deafness was approximately 1 in 6.
- Recurrence risks were estimated at about 1 in 130 for offspring of affected probands and 1 in 250 for offspring of unaffected siblings (excluding dominant mutations).
- An estimated 13 autosomal recessive loci contribute to the genetic basis of non-syndromic sensorineural deafness.
Conclusions:
- Non-syndromic sensorineural deafness exhibits significant familial aggregation, suggesting a strong genetic component.
- Autosomal recessive inheritance plays a substantial role in the etiology of sensorineural deafness.
- These findings provide valuable information for genetic counseling and understanding the genetic architecture of sensorineural deafness.
Abstract:
In a sample of children with sensori-neural deafness and no evidence of a syndrome, ototoxic exposure, or autosomal dominant or X-linked family history, seen in the Division of Medical Genetics of The Montreal Children's Hospital, the probability of a sibling being similarly affected was about 1 in 6, both in French-Canadian families and the remainder of the sample. The frequency of deafness of early onset was measured in the uncles and aunts of probands, and these figures were used to derive approximate recurrence risks for the offspring of probands (about 1 in 130, ignoring the possibility of autosomal dominant mutation) and for the offspring of the probands' unaffected sibs (about 1 in 250). A rough estimate of the number of autosomal recessive loci contributing to sensori-neural deafness is derived as 13.