Abstract
Asymmetric positioning of internal organs is a characteristics of vertebrates. The normal left-right anatomic positioning, situs solitus, sometimes does not occur normaly, leading to laterality defects. Studies in animal models have shown that laterality decisions are mediated by a cascade of genes that lead to the asymmetric expression of Nodal, LEFTA, LEFTB and PITX2 in the lateral plate mesoderm. A search for mutations in genes implicated in left–right patterning in animal models allowed genes associated with heterotaxia defects in humans to be identified. However, these genes explain only a small percentage of human situs defects, suggesting that other genes must play a role. In this study, we report a consanguineous family of Turkish origin, composed of two unaffected parents and three children, two of whom presented Kartagener syndrome. On the basis of their family history, we hypothesize autosomal recessive mode of inheritance. A genotype analysis with polymorphic markers did not show linkage with any known genes or loci causing laterality disorders. Array CGH did not detect a duplication or microdeletion greater than 1 Mb as a possible cause. Genome wide screening using 10 K Affymetrix SNP chips was performed, allowing the identification of two regions of autozygosity, one in chromosome 1 and the other on chromosome 7. In the chromosome 1 locus, a strong candidate gene, encoding the kinesin-associated protein 3 (KIF3AP) was not mutated, based on SSCP/heteroduplex analysis and direct sequencing. These data provide a basis for the identification of a novel gene implicated in Kartagener syndrome.
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Acknowledgements
We are grateful to all the family members for their valuable participation in this study. These studies were supported by the Interuniversity Attraction Poles initiated by the Belgian Science Policy, network 5/25 and the FNRS (Fonds national de la recherche scientifique) (to MV, a ‘Maître de Recherches du F.N.R.S.’), and the National Foundation For Research in Pediatric Cardiology (to Th.S.). I. Gutierrez-Roelens was supported by a fellowship from FRIA (Fonds pour la formation à la recherche dans l'industrie et dans l'agriculture), and the Patrimoine UCL. The authors thank Anne Van Egeren for her expert technical assistance, and Ms Liliana Niculescu for secretarial help.
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Gutierrez-Roelens, I., Sluysmans, T., Jorissen, M. et al. Localization of candidate regions for a novel gene for Kartagener syndrome. Eur J Hum Genet 14, 809–815 (2006). https://doi.org/10.1038/sj.ejhg.5201631
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DOI: https://doi.org/10.1038/sj.ejhg.5201631
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