Neonatal hydrocephalus is a common developmental anomaly affecting the human nervous system with an estimated incidence of 1 to 3 per 1,000 live births creating an estimated healthcare burden of 2 billion dollars annually. Hydrocephalus leads to the expansion of cerebral ventricles and is associated with significant morbidity and mortality with mortality rates as high as 35%. A significant portion of neonatal hydrocephalus is idiopathic in nature. The major goal of this proposal is the identification of molecular mechanisms underlying hydrocephalus for the purpose of developing novel medical treatments. This goal will be pursued by utilizing mouse models of human ciliopathies. Ciliopathies are a group of disorders that display overlapping phenotypes with a common etiology of cilia defects. Ciliopathy models have described that develop hydrocephalus as a result of altered ependymal cilia beat mechanics resulting in abnormal flow of CSF. In this proposal, we challenge the notion that motile cilia defects are the sole cause of hydrocephalus in ciliopathy models with our central hypothesis that abnormal development of specific neural progenitor cells during early development plays a major role in hydrocephalus. The central hypothesis and the specific aims of this proposal are based on strong preliminary data.
In specific aim 1, we will build upon strong preliminary data that show that abnormal development of specific neural progenitor cells lead to hydrocephalus in a specific mouse model of the human disorder, Bardet-Biedl Syndrome (BBS). We will determine the specific neuroprogenitor cells involved in hydrocephalus, and determine the defective signaling pathways in the neuroprogenitor cells that contribute to hydrocephalus.
In specific aim 2, we will determine whether similar mechanisms apply to other ciliopathy mouse models.
In specific aim 3, we will investigate the potential for modifying the hydrocephalic phenotype in ciliopathy mouse models utilizing pharmaceuticals and genetic methods to manipulate signaling pathways identified in Aim 1 and Aim 2. Successful completion of the research outlined in this application will advance the understanding of cilia dysfunction and cilia related diseases in general, especially the molecular mechanism underlying the pathogenesis of hydrocephalus. The results of this study will have significant implications for therapeutic treatment of neonatal hydrocephalus.

Public Health Relevance

Neonatal hydrocephalus is a common developmental anomaly affecting the human nervous system with an estimated incidence of 1 to 3 per 1,000 live births1-4 creating an estimated healthcare burden of 2 billion dollars annually. The successful completion of this project will lead to insights into novel mechanisms involved in hydrocephalus, the understanding of which is important for identifying risk factors for this disorder. The results will potentially improve diagnosis, genetic risk assessment, and treatment of this important disorder.

National Institute of Health (NIH)
National Institute of Neurological Disorders and Stroke (NINDS)
Research Project (R01)
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Study Section
Developmental Brain Disorders Study Section (DBD)
Program Officer
Morris, Jill A
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University of Iowa
Schools of Medicine
Iowa City
United States
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Starks, Rachel D; Beyer, Andreas M; Guo, Deng Fu et al. (2015) Regulation of Insulin Receptor Trafficking by Bardet Biedl Syndrome Proteins. PLoS Genet 11:e1005311
Haziza, Sitvanit; Magnani, Roberta; Lan, Dima et al. (2015) Calmodulin Methyltransferase Is Required for Growth, Muscle Strength, Somatosensory Development and Brain Function. PLoS Genet 11:e1005388
Datta, Poppy; Allamargot, Chantal; Hudson, Joseph S et al. (2015) Accumulation of non-outer segment proteins in the outer segment underlies photoreceptor degeneration in Bardet-Biedl syndrome. Proc Natl Acad Sci U S A 112:E4400-9
Chamling, Xitiz; Seo, Seongjin; Searby, Charles C et al. (2014) The centriolar satellite protein AZI1 interacts with BBS4 and regulates ciliary trafficking of the BBSome. PLoS Genet 10:e1004083
Zhang, Yan; Seo, Seongjin; Bhattarai, Sajag et al. (2014) BBS mutations modify phenotypic expression of CEP290-related ciliopathies. Hum Mol Genet 23:40-51
Mei, Xue; Westfall, Trudi A; Zhang, Qihong et al. (2014) Functional characterization of Prickle2 and BBS7 identify overlapping phenotypes yet distinct mechanisms. Dev Biol 392:245-55
Agassandian, Khristofor; Patel, Milan; Agassandian, Marianna et al. (2014) Ciliopathy is differentially distributed in the brain of a Bardet-Biedl syndrome mouse model. PLoS One 9:e93484
Seo, Seongjin; Mullins, Robert F; Dumitrescu, Alina V et al. (2013) Subretinal gene therapy of mice with Bardet-Biedl syndrome type 1. Invest Ophthalmol Vis Sci 54:6118-32
Zhang, Qihong; Nishimura, Darryl; Vogel, Tim et al. (2013) BBS7 is required for BBSome formation and its absence in mice results in Bardet-Biedl syndrome phenotypes and selective abnormalities in membrane protein trafficking. J Cell Sci 126:2372-80
Chamling, Xitiz; Seo, Seongjin; Bugge, Kevin et al. (2013) Ectopic expression of human BBS4 can rescue Bardet-Biedl syndrome phenotypes in Bbs4 null mice. PLoS One 8:e59101