Noethe-Menchen, Tabea and Wallmeier, Julia and Pennekamp, Petra and Hoeben, Inga M. and Olbrich, Heike and Loges, Niki T. and Raidt, Johanna and Dougherty, Gerard W. and Hjeij, Rim and Dworniczak, Bernd and Omran, Heymut and Amirav, Israel and Biebach, Luisa and Fabricius, Dorit and Griese, Matthias and Grosse-Onnebrink, Joerg and Haeffner, Karsten and Hector, Andreas and Jung, Andreas and Kaiser-Labusch, Petra and Kaiser, Thomas and Kessler, Christina and Kitz, Richard and Knowles, Michael R. and Koerner-Rettberg, Cordula and Kristoffersson, Ulf and Leigh, Margaret W. and Mertsch, Pontus and Mischo, Bernhard and Nielsen, Kim G. and Poeta, Marco and Rietschel, Ernst and Roth, Samra and Santamaria, Francesca and Schmalstieg, Christian and Schmidts, Miriam and Schwarz, Carsten and Schwerk, Nicolaus and Seithe, Horst and Tebbe, Johannes and Werner, Claudius and Zariwala, Maimoona A. (2019) Randomization of Left-Right Asymmetry and Congenital Heart Defects The Role of DNAH5 in Humans and Mice. CIRCULATION-GENOMIC AND PRECISION MEDICINE, 12 (11). ISSN , 1942-325X
Full text not available from this repository. (Request a copy)Abstract
Background: Nearly one in 100 live births presents with congenital heart defects (CHD). CHD is frequently associated with laterality defects, such as situs inversus, a mirrored positioning of internal organs. Body laterality is established by a complex process: monocilia at the embryonic left-right organizer facilitate both the generation and sensing of a leftward fluid flow. This induces the conserved left-sided Nodal signaling cascade to initiate asymmetrical organogenesis. Primary ciliary dyskinesia originates from dysfunction of motile cilia, causing symptoms such as chronic sinusitis, bronchiectasis and frequently situs inversus totalis. The most frequently mutated gene in primary ciliary dyskinesia, DNAH5 is associated with randomization of body asymmetry resulting in situs inversus totalis in half of the patients; however, its relation to CHD occurrence in humans has not been investigated in detail so far. Methods: We performed genotype/phenotype correlations in 132 patients with primary ciliary dyskinesia carrying disease-causing DNAH5 mutations, focusing on situs defects and CHD. Using high-speed video microscopy-, immunofluorescence-, and in situ hybridization analyses, we investigated the initial steps of left-right axis establishment in embryos of a Dnah5-mutant mouse model. Results: In patients with primary ciliary dyskinesia carrying disease-causing DNAH5 mutations, 65.9% (87/132) had laterality defects: 88.5% (77/87) presented with situs inversus totalis, 11.5% (10/87) presented with situs ambiguus; and 6.1% (8/132) presented with CHD. In Dnah5(mut/mut) mice, embryonic left-right organizer monocilia lack outer dynein arms resulting in immotile cilia, impaired flow at the left-right organizer, and randomization of Nodal signaling with normal, reversed or bilateral expression of key molecules. Conclusions: For the first time, we directly demonstrate the disease-mechanism of laterality defects linked to DNAH5 deficiency at the molecular level during embryogenesis. We highlight that mutations in DNAH5 are not only associated with classical randomization of left-right body asymmetry but also with severe laterality defects including CHD.
| Item Type: | Article |
|---|---|
| Uncontrolled Keywords: | PRIMARY CILIARY DYSKINESIA; SITUS-INVERSUS; DISEASE; MUTATIONS; CELLS; cilia; dyneins; live birth; organogenesis; sinusitis |
| Subjects: | 600 Technology > 610 Medical sciences Medicine |
| Divisions: | Medicine > Lehrstuhl für Kinder- und Jugendmedizin |
| Depositing User: | Dr. Gernot Deinzer |
| Date Deposited: | 24 Mar 2020 13:45 |
| Last Modified: | 24 Mar 2020 13:45 |
| URI: | https://pred.uni-regensburg.de/id/eprint/25913 |
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