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  Autosomal recessive mental retardation: homozygosity mapping identifies 27 single linkage intervals, at least 14 novel loci and several mutation hotspots

Kuss, A. W., Garshasbi, M., Kahrizi, K., Tzschach, A., Behjati, F., Darvish, H., et al. (2011). Autosomal recessive mental retardation: homozygosity mapping identifies 27 single linkage intervals, at least 14 novel loci and several mutation hotspots. Hum Genet, 129(2), 141-8. Retrieved from http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&db=PubMed&dopt=Citation&list_uids=21063731 http://www.springerlink.com/content/ej4655222131811p/fulltext.pdf.

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Item Permalink: http://hdl.handle.net/11858/00-001M-0000-0010-7945-E Version Permalink: http://hdl.handle.net/11858/00-001M-0000-0010-7946-C
Genre: Journal Article

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 Creators:
Kuss, A. W.1, Author              
Garshasbi, M.2, Author              
Kahrizi, K., Author
Tzschach, A.2, Author              
Behjati, F., Author
Darvish, H., Author
Abbasi-Moheb, L.1, Author              
Puettmann, L.1, Author              
Zecha, A.1, Author              
Weissmann, R.3, Author              
Hu, H.2, Author              
Mohseni, M., Author
Abedini, S. S., Author
Rajab, A., Author
Hertzberg, C., Author
Wieczorek, D., Author
Ullmann, R.4, Author              
Ghasemi-Firouzabadi, S., Author
Banihashemi, S., Author
Arzhangi, S., Author
Hadavi, V., AuthorBahrami-Monajemi, G., AuthorKasiri, M., AuthorFalah, M., AuthorNikuei, P., AuthorDehghan, A., AuthorSobhani, M., AuthorJamali, P., AuthorRopers, H. H.2, Author              Najmabadi, H., Author more..
Affiliations:
1Familial Cognitive Disorders (Luciana Musante), Dept. of Human Molecular Genetics (Head: Hans-Hilger Ropers), Max Planck Institute for Molecular Genetics, Max Planck Society, ou_1479644              
2Dept. of Human Molecular Genetics (Head: Hans-Hilger Ropers), Max Planck Institute for Molecular Genetics, Max Planck Society, ou_1433549              
3Independent Junior Research Groups (OWL), Max Planck Institute for Molecular Genetics, Max Planck Society, ou_1433554              
4Molecular Cytogenetics (Reinhard Ullmann), Dept. of Human Molecular Genetics (Head: Hans-Hilger Ropers), Max Planck Institute for Molecular Genetics, Max Planck Society, ou_1479645              

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Free keywords: Chromosome Disorders; Family; Genes, Recessive; Intellectual Disability/*genetics; Iran; Monte Carlo Method; *Mutation
 Abstract: Mental retardation (MR) has a worldwide prevalence of around 2% and is a frequent cause of severe disability. Significant excess of MR in the progeny of consanguineous matings as well as functional considerations suggest that autosomal recessive forms of MR (ARMR) must be relatively common. To shed more light on the causes of autosomal recessive MR (ARMR), we have set out in 2003 to perform systematic clinical studies and autozygosity mapping in large consanguineous Iranian families with non-syndromic ARMR (NS-ARMR). As previously reported (Najmabadi et al. in Hum Genet 121:43-48, 2007), this led us to the identification of 12 novel ARMR loci, 8 of which had a significant LOD score (OMIM: MRT5-12). In the meantime, we and others have found causative gene defects in two of these intervals. Moreover, as reported here, tripling the size of our cohort has enabled us to identify 27 additional unrelated families with NS-ARMR and single-linkage intervals; 14 of these define novel loci for non-syndromic ARMR. Altogether, 13 out of 39 single linkage intervals observed in our cohort were found to cluster at 6 different loci on chromosomes, i.e., 1p34, 4q27, 5p15, 9q34, 11p11-q13 and 19q13, respectively. Five of these clusters consist of two significantly overlapping linkage intervals, and on chr 1p34, three single linkage intervals coincide, including the previously described MRT12 locus. The probability for this distribution to be due to chance is only 1.14 x 10(-5), as shown by Monte Carlo simulation. Thus, in contrast to our previous conclusions, these novel data indicate that common molecular causes of NS-ARMR do exist, and in the Iranian population, the most frequent ones may well account for several percent of the patients. These findings will be instrumental in the identification of the underlying genes.

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 Dates: 2011
 Publication Status: Published in print
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Title: Hum Genet
Source Genre: Journal
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Pages: - Volume / Issue: 129 (2) Sequence Number: - Start / End Page: 141 - 8 Identifier: ISSN: 1432-1203 (Electronic) 0340-6717 (Linking)