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. 2019 Jan;95(1):151-159.
doi: 10.1111/cge.13463. Epub 2018 Nov 19.

Effect of inbreeding on intellectual disability revisited by trio sequencing

Kimia Kahrizi  1 , Hao Hu  2 , Masoumeh Hosseini  1 , Vera M Kalscheuer  2 , Zohreh Fattahi  1 , Maryam Beheshtian  1 , Vanessa Suckow  2 , Marzieh Mohseni  1 , Bettina Lipkowitz  2 , Sepideh Mehvari  1 , Zohreh Mehrjoo  1 , Tara Akhtarkhavari  1 , Zhila Ghaderi  1 , Maryam Rahimi  1 , Sanaz Arzhangi  1 , Payman Jamali  3 , Milad Falahat Chian  1 , Pooneh Nikuei  4 , Farahnaz Sabbagh Kermani  5 , Farnaz Sadeghinia  1 , Roshanak Jazayeri  6 , S Hassan Tonekaboni  7 , Atefeh Khoshaeen  8 , Haleh Habibi  9 , Fatemeh Pourfatemi  10 , Faezeh Mojahedi  11 , Mohammad-Reza Khodaie-Ardakani  12 , Reza Najafipour  13 , Thomas F Wienker  2 , Hossein Najmabadi  1   14 , Hans-Hilger Ropers  2   15
Affiliations

Effect of inbreeding on intellectual disability revisited by trio sequencing

Kimia Kahrizi et al. Clin Genet. 2019 Jan.

Abstract

In outbred Western populations, most individuals with intellectual disability (ID) are sporadic cases, dominant de novo mutations (DNM) are frequent, and autosomal recessive ID (ARID) is very rare. Because of the high rate of parental consanguinity, which raises the risk for ARID and other recessive disorders, the prevalence of ID is significantly higher in near- and middle-east countries. Indeed, homozygosity mapping and sequencing in consanguineous families have already identified a plethora of ARID genes, but because of the design of these studies, DNMs could not be systematically assessed, and the proportion of cases that are potentially preventable by avoiding consanguineous marriages or through carrier testing is hitherto unknown. This prompted us to perform whole-exome sequencing in 100 sporadic ID patients from Iran and their healthy consanguineous parents. In 61 patients, we identified apparently causative changes in known ID genes. Of these, 44 were homozygous recessive and 17 dominant DNMs. Assuming that the DNM rate is stable, these results suggest that parental consanguinity raises the ID risk about 3.6-fold, and about 4.1 to 4.25-fold for children of first-cousin unions. These results do not rhyme with recent opinions that consanguinity-related health risks are generally small and have been "overstated" in the past.

Keywords: impact of inherited and de novo mutations; intellectual disability risks; parent-patient trios; parental consanguinity; whole-exome sequencing.

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