Description of Research Expertise

Research Interests
Genome wide association studies of age-related macular degeneration and glaucoma; Next-generation targeted sequencing of age-related macular degeneration in African Americans; Genetics of age-related macular degeneration in the Amish; Whole exome sequencing of families with refractive error; Zebrafish modeling of refractive error and glaucoma; Characterization of mouse models for microphthalmia.

Key Words: Fun Lab, Bioinformatics galore, espirit de corps, collegial atmosphere, challenging projects, molecular genetics.

Description of Research:

Age-related macular degeneration (AMD) in African Americans
Much work has been accomplished on the genetics of AMD in Caucasians to the point that we currently have 10 well-defined loci identified by genome-wide association studies. While we have had amazing successes in Caucasians for AMD, very little has been done in African Americans probably because the disease is much rarer in this group. A GWAS study is not plausible in African Americans because of the decreased frequency of AMD. Therefore, we are using new DNA sequencing technology to identify the reasons that AMD is less severe in African Americans. We have collected a large cohort of African American cases and controls and are currently utilizing targeted next-gen sequencing to identify protective haplotypes that might offer an explanation of resistance to AMD development in African Americans. If these protective SNPs are found, they could serve as new potential drug targets.

Expression differences between normal and AMD eyes
We have been very successful in the identification of susceptibility genes for AMD through GWAS. The next horizon is to understand the expression differences between eyes with AMD and eyes that are normal. To identify differential expression between normal and AMD eyes, we have collected a series of postmortem eyes with and without AMD. RNA and DNA has been isolated from these eyes for the purpose of RNA sequencing and genotyping. Our underlying hypothesis is that there is a difference in normal transcript expression between normal and AMD eyes or a defect in alternative splicing that predisposes to AMD. The RNA-Seq data is being analyzed for expression differences as well as for alternative splicing defects with our new algorithm developed in the lab, SplicePL. Expression will also be correlated with known AMD risk SNPs to assess SNP potential to influence expression.

Genetics of AMD in the Amish
The genetics of AMD has been well studied in unrelated case-control Caucasian cohorts. However, very little has been done to identify genes in families. To that end, we have screened 3000 Amish individuals over the age of 50 years living in Lancaster County, Pa for various eye diseases including AMD. Every subject visiting the Amish clinic received a full eye exam, an epidemiology questionnaire, and a fundus photo along with the donation of a blood sample. We currently have DNA on all these individuals. Our collected Amish cohort currently consists of 750 nuclear families and has tremendous power to identify rare variants. We are currently preparing to do whole exome sequencing in selected families for the purpose of rare variant discovery in AMD. Discovery of rare AMD variants of large effect will have potential impact in the general population.

Genetics of Refractive Error
Refractive error is an abnormality of the eye that results in myopia, hyperopia or astigmatism. It is the leading cause of blindness worldwide. Most studies to date have centered on family linkage studies. Our lab is currently leading an international consortium to identify the genes for refractive error through GWAS and next-gen sequencing. We have just completed a GWAS of 7000 individuals with a few significant hits. We now seek to understand how these significant GWAS SNPs lead to the development of refractive error. We are currently utilizing bioinformatic tools to characterize the function of these SNPS and will move to functional studies in zebrafish after exhausting our bioinformatic tools. In addition, we have collected DNA from large families transmitting myopia and are preparing to perform whole exome sequencing to identify rare variants in these families.

Modeling of Human Disease in Zebrafish
We have developed a system in the lab to assess the refractive error phenotype in zebrafish embryos. Current experiments include knockdown and overexpression of various potential refractive error genes as a validation to the GWAS hits we have identified. Validated results in a zebrafish model will be followed by RNA-Seq of the mutants to provide a framework for a systems biology approach to understanding refractive error.

Characterization of Mouse Models for Microphthalmia
Over the past few years we have been characterizing a mouse model for microphthalmia (Tcm), a phenotype identified in a colony of X-ray irradiated mouse. Genetic mapping refined the causative locus to a 1.3Mb region on mouse Chromosome 4 which contains 5 genes. Further molecular characterization is underway in our lab to identify the founder mutation responsible for the microphthalmic phenotype.

Common techniques in the lab include bioinformatics, DNA cloning, PCR, agarose gel electrophoresis, in situ hybridization, DNA sequencing and library screening.

Lab Personnel:
Murthy Chavali
Eric Chen
Dave Collins
Debra Dana
Neil Farbman
Harini Gudiseva
Trafina Jadhav
Krista Kazmierkiewicz
Mijin Kim
Aishat Mohammed
Akshit Nayar
Poorva Sethi
Lifeng Tian
Stephanie Yee

Selected Publications

Oncel D, Corradetti G, He Y, Ashrafkhorasani M, Nittala MG, Stambolian D, Pericak-Vance MA, Haines JL, Sadda SR.: Assessment of intraretinal hyperreflective foci using multimodal imaging in eyes with age-related macular degeneration Acta Ophthalmol 102 : e126-e132,2024.

Verma A, Nittala MG, Corradetti G, Nassisi M, Velaga SB, He Y, Haines JL, Pericak-Vance MA, Stambolian D, Sadda SR.: Longitudinal Evaluation of the Distribution of Intraretinal Hyper-Reflective Foci in Eyes with Intermediate Age-Related Macular Degeneration Curr Eye Res 19 : 1-7,2024.

Kwong A, Zawistowski M, Fritsche LG, Zhan X, Bragg-Gresham J, Branham KE, Advani J, Othman M, Ratnapriya R, Teslovich TM, Stambolian D, Chew EY, Abecasis GR, Swaroop A.: Whole genome sequencing of 4,787 individuals identifies gene-based rare variants in age-related macular degeneration Hum Mol Genet 33 : 374-385,2024.

Shwani T, Zhang C, Owen LA, Shakoor A, Vitale AT, Lillvis JH, Barr JL, Cromwell P, Finley R, Husami N, Au E, Zavala RA, Graves EC, Zhang SX, Farkas MH, Ammar DA, Allison KM, Tawfik A, Sherva RM, Li M, Stambolian D, Kim IK, Farrer LA, DeAngelis MM.: Patterns of Gene Expression, Splicing, and Allele-Specific Expression Vary among Macular Tissues and Clinical Stages of Age-Related Macular Degeneration Cells 12 : 2668,2023.

Sadda S, Verma A, Corradetti G, Nittala M, He Y, Nassisi M, Velaga SB, Haines J, Pericak-Vance M, Stambolian D.: Longitudinal evaluation of the distribution of intraretinal hyper-reflective foci in eyes with intermediate age-related macular degeneration Res Sq : 2023.

Oncel D, Corradetti G, Wakatsuki Y, Nittala MG, Velaga SB, Stambolian D, Pericak-Vance MA, Haines JL, Sadda SR.: Drusen morphometrics on optical coherence tomography in eyes with age-related macular degeneration and normal aging Graefes Arch Clin Exp Ophthalmol 261 : 3437-3447,2023.

Musolf AM, Haarman AEG, Luben RN, Ong JS, Patasova K, Trapero RH, Marsh J, Jain I, Jain R, Wang PZ, Lewis DD, Tedja MS, Iglesias AI, Li H, Cowan CS; Consortium for Refractive Error and Myopia (CREAM); Biino G, Klein AP, Duggal P, Mackey DA, Hayward C, Haller T, Metspalu A, Wedenoja J, Pärssinen O, Cheng CY, Saw SM, Stambolian D, Hysi PG, Khawaja AP, Vitart V, Hammond CJ, van Duijn CM, Verhoeven VJM, Klaver CCW, Bailey-Wilson JE.: Rare variant analyses across multiethnic cohorts identify novel genes for refractive error Commun Biol 6 : 6,2023.

Clark R, Lee SS, Du R, Wang Y, Kneepkens SCM, Charng J, Huang Y, Hunter ML, Jiang C, Tideman JWL, Melles RB, Klaver CCW, Mackey DA, Williams C, Choquet H, Ohno-Matsui K, Guggenheim JA; CREAM Consortium; UK Biobank Eye and Vision Consortium.: A new polygenic score for refractive error improves detection of children at risk of high myopia but not the prediction of those at risk of myopic macular degeneration EBioMedicine 91 : 104551,2023.

Verma A, Corradetti G, He Y, Nittala MG, Nassisi M, Velaga SB, Haines JL, Pericak-Vance MA, Stambolian D, Sadda SR.: Relationship between the distribution of intra-retinal hyper-reflective foci and the progression of intermediate age-related macular degeneration Graefes Arch Clin Exp Ophthalmol 261 : 3437-3447,2023.

Nittala MG, Corvi F, Maram J, Velaga SB, Haines J, Pericak-Vance MA, Stambolian D, Sadda SR.: Risk Factors for Progression of Age-Related Macular Degeneration: Population-Based Amish Eye Study J Clin Med 11 : 5110,2022.

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Academic Contact Information

Rm. 313 Stellar-Chance Labs
422 Curie Boulevard
Philadelphia, PA 19104-6069
Patient appointments: 800-789-7366