Effect of inbreeding on intellectual disability revisited by trio sequencing

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...

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Vydáno v:	Clinical genetics Ročník 95; číslo 1; s. 151 - 159
Hlavní autoři:	Kahrizi, Kimia, Hu, Hao, Hosseini, Masoumeh, Kalscheuer, Vera M., Fattahi, Zohreh, Beheshtian, Maryam, Suckow, Vanessa, Mohseni, Marzieh, Lipkowitz, Bettina, Mehvari, Sepideh, Mehrjoo, Zohreh, Akhtarkhavari, Tara, Ghaderi, Zhila, Rahimi, Maryam, Arzhangi, Sanaz, Jamali, Payman, Falahat Chian, Milad, Nikuei, Pooneh, Sabbagh Kermani, Farahnaz, Sadeghinia, Farnaz, Jazayeri, Roshanak, Tonekaboni, S. Hassan, Khoshaeen, Atefeh, Habibi, Haleh, Pourfatemi, Fatemeh, Mojahedi, Faezeh, Khodaie‐Ardakani, Mohammad‐Reza, Najafipour, Reza, Wienker, Thomas F., Najmabadi, Hossein, Ropers, Hans‐Hilger
Médium:	Journal Article
Jazyk:	angličtina
Vydáno:	Oxford, UK Blackwell Publishing Ltd 01.01.2019
Témata:	Children Consanguinity Exome - genetics Family Female Genes, Recessive Homozygote Humans impact of inherited and de novo mutations Inbreeding Intellectual disabilities Intellectual Disability - epidemiology Intellectual Disability - genetics Intellectual Disability - pathology intellectual disability risks Iran - epidemiology Male Middle East - epidemiology Mutation parental consanguinity parent‐patient trios Pedigree Whole Exome Sequencing Middle East Iran impact of inherited and de novo mutations parent-patient trios parental consanguinity whole-exome sequencing intellectual disability risks
ISSN:	0009-9163, 1399-0004, 1399-0004
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Popis
Shrnutí:	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.
Bibliografie:	ObjectType-Article-1 SourceType-Scholarly Journals-1 ObjectType-Feature-2 content type line 14 content type line 23
ISSN:	0009-9163 1399-0004 1399-0004
DOI:	10.1111/cge.13463