LncRNA-DRSGN (Down-Regulated in Spiral Ganglion Neurons) Competes with miR-27a for Binding to FAM172A, Supervises SGN Degeneration and ER (Endoplasmic Reticulum) Stress-Autophagy in CHARGE Syndrome

Abstract

Background: Hearing loss is one of the most common disabilities in the world and brings a heavy burden to society. The current model is not stable enough, and it has caused serious model interference to clarify the pathogenesis of CHARGE syndrome. Methods: The knockout mouse model of FAM172A gene was constructed, and sits phenotype was identified. Besides, the next-genesequencing experiments of noncoding RNAs were performed utilizing the primary SGNs of model mice. The biofunctions of FAM172A in the relationships between ER (Endoplasmic reticulum) stress, autophagy, and intracellular calcium flux were investigated. Moreover, the above role associated with the competitive combination among LncRNA-DRSGN, miR-27a, and FAM172A were studied in the progression of SGN degeneration and autophagy in the model of CHARGE syndrome. Results: FAM172A(-/-) exhibited abnormal hearing, growth retardation, abnormal eye development, and dysgnosia. It was in line with the phenotype of CHARGE syndrome. Moreover, there was degeneration of SGNs in FAM172A(-/-) mice, and the differential expression of noncoding RNAs in primary SGNs were found and identified, including miR-27a and LncRNA-DRSGN. LncRNA-DRSGN regulated miR-27a as a ceRNA, and miR-27a inhibited FAM172A expression, LncRNA-DRSGN competed with miR-27a for binding to FAM172A, which participated in the regulation of ER stress-related calcium flux. LncRNA-DRSGN regulated the autophagy process of neurons by competing with miR-27a for binding to FAM172A. Conclusion: LncRNA-DRSGN competed with miR-27a for binding to FAM172A, participated in regulating ER stress-related calcium flux, then affected neuron degeneration and autophagy process of SGNs in the model of CHARGE syndrome.