rare, many individuals are carriers for recessive genetic disorders: on average, each person is a carrier for three or four deleterious, disease-causing mutations. An approach to effectively identify carriers of these diseases would be welcomed by the medical community, especially in cases where the disease-causing mutation is unknown or uncharacterized at the DNA level.

Based on the results of the study, Cheung and Ewens also suggest that recessive mutations can significantly contribute to human variation. ‘If each of us is a carrier for three or four harmful recessive mutations, and if the expression levels of several hundred genes are altered for each of these mutations, then heterozygosity for recessive mutations plays a significant role in human variation and in the overall genetic architecture of complex human traits and diseases,’ explains Cheung.

Source: Eurekaert
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