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A Rapid and Sensitive Next-Generation Sequencing Method to Detect RB1 Mutations Improves Care for Retinoblastoma Patients and Their Families.
Journal of Molecular Diagnostics : JMD 2016 July
Retinoblastoma is a childhood eye malignancy that can lead to the loss of vision, eye(s), and sometimes life. The tumors are initiated by inactivating mutations in both alleles of the tumor-suppressor gene, RB1, or, rarely, by MYCN amplification. Timely identification of a germline RB1 mutation in blood samples or either somatic RB1 mutation or MYCN amplification in tumors is important for effective care and management of retinoblastoma patients and their families. However, current procedures to thoroughly test RB1 mutations are complicated and lengthy. Herein, we report a next-generation sequencing-based method capable of detecting point mutations, small indels, and large deletions or duplications across the entire RB1 gene and amplification of MYCN gene on a single platform. From DNA extraction to clinical interpretation requires only 3 days, enabling early molecular diagnosis of retinoblastoma and optimal treatment outcomes. This method can also detect low-level mosaic mutations in blood samples that can be missed by routine Sanger sequencing. In addition, it can differentiate between RB1 mutation- and MYCN amplification-driven retinoblastomas. This rapid, comprehensive, and sensitive method for detecting RB1 mutations and MYCN amplification can readily identify RB1 mutation carriers and thus improve the management and genetic counseling for retinoblastoma patients and their families.
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