Intellectual Disability (ID) is a heterogeneous disorder, in which at least 600 genes participate. The present study aimed to identify the effect of genetic counseling and consanguinity marriage in Iranian families with sporadic mental disability.
Materials and Methods: In this retrospective cross-sectional study, we examined 151 families with a sporadic mental disability referred for genetic consultation to the Welfare Center of Sari city, North of Iran.
Results: About 41.05% (n=62) of the cases were consanguinity marriage. In this study, other diseases were also observed with ID. The following four types of consultations were also reviewed, most of which were Diagnostic Counseling (DC) (60%). According to the inheritance pattern analysis, the share of non-hereditary cases was higher compared to the share of hereditary and unknown cases. The results of the present study showed a significant difference between consanguinity marriages and potential genetic etiology ID (P=0.012). Besides, there was no significant difference between other groups.
Conclusion: In this study, we highlighted the importance of genetic counseling and found that consanguinity marriage was a key factor in the development of the disease in our society. Therefore, given the high cost of genetic tests and socio-economic problems, it is wise to include genetic counseling to prevent many diseases such as mental disability before birth.