Preprint Article Version 1 Preserved in Portico This version is not peer-reviewed

Novel Homozygous TULP1 and RPE65 Variants Underlies Recessive Retinitis Pigmentosa

Version 1 : Received: 2 September 2020 / Approved: 3 September 2020 / Online: 3 September 2020 (07:16:45 CEST)

How to cite: Khan, A.; Bai, X.; Umair, M.; Han, S.; Habulieti, X.; Wang, R.; Zhang, X. Novel Homozygous TULP1 and RPE65 Variants Underlies Recessive Retinitis Pigmentosa. Preprints 2020, 2020090062 (doi: 10.20944/preprints202009.0062.v1). Khan, A.; Bai, X.; Umair, M.; Han, S.; Habulieti, X.; Wang, R.; Zhang, X. Novel Homozygous TULP1 and RPE65 Variants Underlies Recessive Retinitis Pigmentosa. Preprints 2020, 2020090062 (doi: 10.20944/preprints202009.0062.v1).

Abstract

Retinitis pigmentosa (RP) clinically and genetically heterogeneous group of inherited retinal disorders (IRD) that result in retinal degeneration. This study aimed to identify the genetic findings of patients with autosomal recessive retinitis pigmentosa (arRP). Whole exome sequencing (WES) was performed in two unrelated Pakistani families underlying arRP. Data analysis and mutation screening was performed for all the known RP genes following bi-directional Sanger sequencing to determine whether any of the candidate variants co-segregated with the disease phenotype in the families. WES data analysis revealed a novel homozygous missense variant (c.1274T>C) in the in Tubby like Protein 1 (TULP1 NM_003322.6) gene in family 1 and a novel homozygous frameshift variant (c.351delC) in the retinoid isomerohydrolase 65 (RPE65 NM_000329.3) gene in family 2. The identified variants perfectly co-segregated with the disease phenotype within the families. Our results strongly suggest that mutations in TULP1 and RPE65 are responsible for the retinal phenotype in the affected individuals. These mutations will increase the mutation spectrum of these genes; furthermore, it will enhance our knowledge and understanding of the underlying molecular mechanisms of retinitis pigmentosa.

Subject Areas

retinitis pigmentosa; TULP1; RPE65; recessive; missense; frameshift

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