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Mutations in MINAR2 encoding membrane integral NOTCH2-associated receptor 2 cause deafness in humans and mice

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Guney Bademci, María Lachgar-Ruiz, Mangesh Deokar, Mohammad Faraz Zafeer, Clemer Abad, Muzeyyen Yildirim Baylan, Neil J. Ingham, Jing Chen, Claire J. Sineni, Nirmal Vadgama, Ioannis Karakikes, Shengru Guo, Duygu Duman, Nitu Singh, Gaurav Harlalka, Shirish P. Jain, Barry A. Chioza, Katherina Walz, Karen P. Steel, Jamal Nasir & 1 more Mustafa Tekin

Original languageEnglish
Article numbere2204084119
Pages (from-to)e2204084119
JournalProceedings of the National Academy of Sciences of the United States of America
Volume119
Issue number26
DOIs
Published28 Jun 2022

Bibliographical note

Funding Information: ACKNOWLEDGMENTS. We are immensely grateful to all the patients and families participating in this study. This study was supported by R01DC009645 and R01DC012836 from the NIH/National Institute on Deafness (M.T.), the National Institute for Health and Care Research Biomedical Research Centre, King's College London (K.P.S.), and the Royal National Institute for Deaf People (K.P.S.). This research was funded in part by the Wellcome Trust. For the purpose of Open Access, the author has applied a CC BY public copyright license to any Author Accepted Manuscript version arising from this submission. We thank the Wellcome Sanger Institute Mouse Genetics Project for generating and providing the Minar2 mouse mutant. M.D. and G.H. would also like to express sincere gratitude for all the support provided by Dr. S. P. Jain, Principal, Rajarshi Shahu College of Pharmacy, Mal-vihir, Buldana, India. Funding Information: We are immensely grateful to all the patients and families participating in this study. This study was supported by R01DC009645 and R01DC012836 from the NIH/National Institute on Deafness (M.T.), the National Institute for Health and Care Research Biomedical Research Centre, King's College London (K.P.S.), and the Royal National Institute for Deaf People (K.P.S.). This research was funded in part by the Wellcome Trust. For the purpose of Open Access, the author has applied a CC BY public copyright license to any Author Accepted Manuscript version arising from this submission. We thank the Wellcome Sanger Institute Mouse Genetics Project for generating and providing the Minar2 mouse mutant. M.D. and G.H. would also like to express sincere gratitude for all the support provided by Dr. S. P. Jain, Principal, Rajarshi Shahu College of Pharmacy, Malvihir, Buldana, India. Publisher Copyright: Copyright © 2022 the Author(s).

King's Authors

Abstract

Discovery of deafness genes and elucidating their functions have substantially contributed to our understanding of hearing physiology and its pathologies. Here we report on DNA variants in MINAR2, encoding membrane integral NOTCH2-associated receptor 2, in four families underlying autosomal recessive nonsyndromic deafness. Neurologic evaluation of affected individuals at ages ranging from 4 to 80 y old does not show additional abnormalities. MINAR2 is a recently annotated gene with limited functional understanding. We detected three MINAR2 variants, c.144G > A (p.Trp48*), c.412_419delCGGTTTTG (p.Arg138Valfs*10), and c.393G > T, in 13 individuals with congenital- or prelingual-onset severe-to-profound sensorineural hearing loss (HL). The c.393G > T variant is shown to disrupt a splice donor site. We show that Minar2 is expressed in the mouse inner ear, with the protein localizing mainly in the hair cells, spiral ganglia, the spiral limbus, and the stria vascularis. Mice with loss of function of the Minar2 protein (Minar2tm1b/tm1b) present with rapidly progressive sensorineural HL associated with a reduction in outer hair cell stereocilia in the shortest row and degeneration of hair cells at a later age. We conclude that MINAR2 is essential for hearing in humans and mice and its disruption leads to sensorineural HL. Progressive HL observed in mice and in some affected individuals and as well as relative preservation of hair cells provides an opportunity to interfere with HL using genetic therapies.

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