The purpose of this continuing project is to identify the genes and mutations causing autosomal dominant retinitis pigmentosa (adRP). AdRP, like other forms of inherited retinal disease, is a complex set of disorders, with multiple causes, variable symptoms, and differing consequences. For example, mutations in seventeen distinct genes are known to cause adRP. However, mutations in the known genes account for less than 60% of adRP families, thus there is a long way to go before adRP is understood at a genetic level. Our goal is to identify the genes and mutations affecting the remaining 40% of families. We hypothesize that the remaining cases will be caused by 1) mutations in novel adRP genes and 2) mutations in known genes that are not detected by standard screening methods or mutations that are not recognized as pathogenic. It is also clear that some families with """"""""adRP"""""""" actually have more complex modes of inheritance, i.e., digenic or X-linked dominant disease. The challenge is to cut through this complexity to identify the genes that cause the largest fraction of cases. To achieve this goal we have established a step-wise, systematic approach to patient ascertainment, mutation testing, linkage mapping, and candidate gene screening. Patients and families are ascertained through our clinical collaborators and enrolled in our studies. We evaluate each patient and family to select the most effective staging of tests to determine the underlying gene and mutation. Patients and families are re-evaluated at each subsequent stage. Suitable families become part of our growing cohort of well-characterized adRP families, now numbering 215. DNAs from probands are tested by rapid screening methods to detect common mutations in known adRP genes. Those without mutations become part of an expanding panel of samples for finding new disease genes and novel mutations in known genes. Families with multiple, accessible, affected individuals are enrolled for linkage mapping to test for linkage to known dominant RP genes (to uncover mutations not detected earlier) and, if the known genes are excluded, for genome-wide linkage testing (to find new adRP genes). These families are our """"""""Gene Discovery Cohort"""""""". Our current set of linkage markers for dominant RP genes is targeted to all of the known genes and loci, several additional candidate genes, and X-linked genes which may cause clinical symptoms in carrier females. Genome-wide linkage testing will be done by SNP typing using the Affymetrix GeneChip Human Mapping 10K Array, available through the Univ. of Texas MD Anderson Cancer Center Microarray Core Facility, Houston, Texas. Finally, probands from families that are not large enough for linkage mapping become part of our """"""""Mutation Testing Panel"""""""". As new genes are identified, or as new approaches to testing become available, this panel is screened to replicate findings, determine prevalences, and evaluate new concepts.

Agency
National Institute of Health (NIH)
Institute
National Eye Institute (NEI)
Type
Research Project (R01)
Project #
5R01EY007142-15
Application #
8141950
Study Section
Biology and Diseases of the Posterior Eye Study Section (BDPE)
Program Officer
Chin, Hemin R
Project Start
2008-09-15
Project End
2013-08-31
Budget Start
2011-09-01
Budget End
2013-08-31
Support Year
15
Fiscal Year
2011
Total Cost
$319,761
Indirect Cost
Name
University of Texas Health Science Center Houston
Department
Public Health & Prev Medicine
Type
Schools of Public Health
DUNS #
800771594
City
Houston
State
TX
Country
United States
Zip Code
77225
Chen, Yong; Zhao, Li; Wang, Yi et al. (2017) SeqCNV: a novel method for identification of copy number variations in targeted next-generation sequencing data. BMC Bioinformatics 18:147
Sullivan, Lori S; Bowne, Sara J; Koboldt, Daniel C et al. (2017) A Novel Dominant Mutation in SAG, the Arrestin-1 Gene, Is a Common Cause of Retinitis Pigmentosa in Hispanic Families in the Southwestern United States. Invest Ophthalmol Vis Sci 58:2774-2784
Jones, Kaylie D; Wheaton, Dianna K; Bowne, Sara J et al. (2017) Next-generation sequencing to solve complex inherited retinal dystrophy: A case series of multiple genes contributing to disease in extended families. Mol Vis 23:470-481
Daiger, Stephen P (2016) Mutations in Linkage Disequilibrium With Putative Disease-Causing Mutations. Invest Ophthalmol Vis Sci 57:4814
Strom, Samuel P; Clark, Michael J; Martinez, Ariadna et al. (2016) De Novo Occurrence of a Variant in ARL3 and Apparent Autosomal Dominant Transmission of Retinitis Pigmentosa. PLoS One 11:e0150944
Fahim, Abigail T; Daiger, Stephen P (2016) The Role of X-Chromosome Inactivation in Retinal Development and Disease. Adv Exp Med Biol 854:325-31
Shankar, Suma P; Hughbanks-Wheaton, Dianna K; Birch, David G et al. (2016) Autosomal Dominant Retinal Dystrophies Caused by a Founder Splice Site Mutation, c.828+3A>T, in PRPH2 and Protein Haplotypes in trans as Modifiers. Invest Ophthalmol Vis Sci 57:349-59
Thomas, Akshay S; Branham, Kari; Van Gelder, Russell N et al. (2016) Multimodal Imaging in Wagner Syndrome. Ophthalmic Surg Lasers Imaging Retina 47:574-9
Daiger, Stephen P; Sullivan, Lori S; Bowne, Sara J et al. (2016) Identification of a Novel Gene on 10q22.1 Causing Autosomal Dominant Retinitis Pigmentosa (adRP). Adv Exp Med Biol 854:193-200
Bowne, Sara J; Sullivan, Lori S; Wheaton, Dianna K et al. (2016) North Carolina macular dystrophy (MCDR1) caused by a novel tandem duplication of the PRDM13 gene. Mol Vis 22:1239-1247

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