(Instructions): Human structural birth defects are present in 4-5% of live births in the US, contributing to half of all pediatric hospitalizations. Importantly, the rates are double in most of the Middle East, Central Asia and North Africa where consanguinity rates approaching 60% are the norm. Of these. Structural Brain Disorders (SBDs) are probably the single biggest component to the long-term medical complications, greatly increased morbidity and mortality. Our data demonstrate tremendous locus and genetic heterogeneity among patients with SBDs from these geographic regions, presenting both a challenge as well as an opportunity. The challenge is to derive strategies to molecularly classify patients with these diseases. The opportunity is that these populations offer the chance to identify a much fuller picture of the genes contributing to SBDs in humans. Comprehensive discovery of mutations contributing to SBDs holds great promise for advancing understanding of determinants of brain development and function, and its consequences including epilepsy, developmental delay, and motor deficits. The search for SBD genes has been hampered by the lack of well-characterized pedigrees to perform gene discovery. The ability to generate whole exome sequence (WES) from such patients only increases the need for multiplex consanguineous pedigrees for these strategies, because the validation of potentially deleterious sequence variants (PDSV) requires segregation analysis. Dr. Gleeson has collected probably the world?s largest cohort of such pedigrees with SBDs over the past 10 years, which will continue in Y1-5. From these, we will perform WES on 30 probands per year in Core A, and sequence analysis in Core B. Segregation analysis in the initial family and subsequent screening in patient cohorts, both from the Gleeson lab, as well as local clinics and the massive California Birth Defects Monitoring Service will help will validate the gene's involvement in the disease. Finally, genes identified from Project 11 and III will be screened in the cohort using similar high-throughput re-sequencing strategies. In Project II and III, animal models will be created and utilized to identify underlying cellular pathophysiology, with a focus on altered cell polarity.

Public Health Relevance

SBDs are a major cause of epilepsy, developmental delay and intellectual disability, and can contribute to a host of neuropsychiatric disorders. We propose to use WES to discover genes that case SBDs in a highly selected cohort of 30 independent families/year negative for mutations in known genes. Synergy with the other Projects and Cores will explore the gene's prevalence in di sease, and underlying pathogenesis.

Agency
National Institute of Health (NIH)
Institute
Eunice Kennedy Shriver National Institute of Child Health & Human Development (NICHD)
Type
Research Program Projects (P01)
Project #
5P01HD070494-04
Application #
8731260
Study Section
Special Emphasis Panel (ZHD1-DSR-Y)
Project Start
Project End
Budget Start
2014-08-01
Budget End
2015-07-31
Support Year
4
Fiscal Year
2014
Total Cost
$255,779
Indirect Cost
$57,524
Name
University of California San Diego
Department
Type
DUNS #
804355790
City
La Jolla
State
CA
Country
United States
Zip Code
92093
De Mori, Roberta; Romani, Marta; D'Arrigo, Stefano et al. (2017) Hypomorphic Recessive Variants in SUFU Impair the Sonic Hedgehog Pathway and Cause Joubert Syndrome with Cranio-facial and Skeletal Defects. Am J Hum Genet 101:552-563
Breuss, Martin W; Nguyen, Thai; Srivatsan, Anjana et al. (2017) Uner Tan syndrome caused by a homozygous TUBB2B mutation affecting microtubule stability. Hum Mol Genet 26:258-269
Marin-Valencia, Isaac; Gerondopoulos, Andreas; Zaki, Maha S et al. (2017) Homozygous Mutations in TBC1D23 Lead to a Non-degenerative Form of Pontocerebellar Hypoplasia. Am J Hum Genet 101:441-450
Friedman, Jennifer; Feigenbaum, Annette; Chuang, Nathaniel et al. (2017) Pyruvate dehydrogenase complex-E2 deficiency causes paroxysmal exercise-induced dyskinesia. Neurology 89:2297-2298
Koizumi, Hiroyuki; Fujioka, Hiromi; Togashi, Kazuya et al. (2017) DCLK1 phosphorylates the microtubule-associated protein MAP7D1 to promote axon elongation in cortical neurons. Dev Neurobiol 77:493-510
Lardelli, Rea M; Schaffer, Ashleigh E; Eggens, Veerle R C et al. (2017) Biallelic mutations in the 3' exonuclease TOE1 cause pontocerebellar hypoplasia and uncover a role in snRNA processing. Nat Genet 49:457-464
McConnell, Michael J; Moran, John V; Abyzov, Alexej et al. (2017) Intersection of diverse neuronal genomes and neuropsychiatric disease: The Brain Somatic Mosaicism Network. Science 356:
T?rlungeanu, Dora C; Deliu, Elena; Dotter, Christoph P et al. (2016) Impaired Amino Acid Transport at the Blood Brain Barrier Is a Cause of Autism Spectrum Disorder. Cell 167:1481-1494.e18
Johansen, Anide; Rosti, Rasim O; Musaev, Damir et al. (2016) Mutations in MBOAT7, Encoding Lysophosphatidylinositol Acyltransferase I, Lead to Intellectual Disability Accompanied by Epilepsy and Autistic Features. Am J Hum Genet 99:912-916
Scott, Eric M; Halees, Anason; Itan, Yuval et al. (2016) Characterization of Greater Middle Eastern genetic variation for enhanced disease gene discovery. Nat Genet 48:1071-6

Showing the most recent 10 out of 66 publications