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Booth KT, Hirsch Y, Vardaro AC, Ekstein J, Yefet D, Quint A, Weiden T, Corey DP. Identification of Novel and Recurrent Variants in MYO15A in Ashkenazi Jewish Patients With Autosomal Recessive Nonsyndromic Hearing Loss. Front Genet 2021; 12:737782. [PMID: 34733312 PMCID: PMC8558392 DOI: 10.3389/fgene.2021.737782] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/07/2021] [Accepted: 09/21/2021] [Indexed: 12/02/2022] Open
Abstract
Hearing loss is a genetically and phenotypically heterogeneous disorder. The purpose of this study was to determine the genetic cause underlying hearing loss in four Ashkenazi Jewish families. We screened probands from each family using a combination of targeted mutation screening and exome sequencing to identifiy the genetic cause of hearing loss in each family. We identified four variants in MYO15A, two novel variants never previously linked to deafness (c.7212+5G>A and p.Leu2532ArgfsTer37) and two recurrent variants (p.Tyr2684His and p.Gly3287Gly). One family showed locus heterogeneity, segregrating two genetic forms of hearing loss. Mini-gene assays revealed the c.7212+5G>A variant results in abnormal splicing and is most likely a null allele. We show that families segregrating the p.Gly3287Gly variant show both inter and intra-familial phenotypic differences. These results add to the list of MYO15A deafness-causing variants, further confirm the pathogenicity of the p.Gly3287Gly variant and shed further light on the genetic etiology of hearing loss in the Ashkenazi Jewish population.
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Affiliation(s)
- Kevin T. Booth
- Department of Neurobiology, Harvard Medical School, Boston, MA, United States
| | - Yoel Hirsch
- Dor Yeshorim, Committee for Prevention of Jewish Genetic Diseases, Brooklyn, NY, United States
| | - Anna C. Vardaro
- Department of Neurobiology, Harvard Medical School, Boston, MA, United States
| | - Josef Ekstein
- Dor Yeshorim, Committee for Prevention of Jewish Genetic Diseases, Brooklyn, NY, United States
| | - Devorah Yefet
- Dor Yeshorim, Committee for Prevention of Jewish Genetic Diseases, Jerusalem, Israel
| | - Adina Quint
- Dor Yeshorim, Committee for Prevention of Jewish Genetic Diseases, Jerusalem, Israel
| | - Tzvi Weiden
- Dor Yeshorim, Committee for Prevention of Jewish Genetic Diseases, Jerusalem, Israel
| | - David P. Corey
- Department of Neurobiology, Harvard Medical School, Boston, MA, United States
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Hirsch Y, Tangshewinsirikul C, Booth KT, Azaiez H, Yefet D, Quint A, Weiden T, Brownstein Z, Macarov M, Davidov B, Pappas J, Rabin R, Kenna MA, Oza AM, Lafferty K, Amr SS, Rehm HL, Kolbe DL, Frees K, Nishimura C, Luo M, Farra C, Morton CC, Scher SY, Ekstein J, Avraham KB, Smith RJH, Shen J. A synonymous variant in MYO15A enriched in the Ashkenazi Jewish population causes autosomal recessive hearing loss due to abnormal splicing. Eur J Hum Genet 2021; 29:988-997. [PMID: 33398081 PMCID: PMC8187401 DOI: 10.1038/s41431-020-00790-w] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/13/2020] [Revised: 11/04/2020] [Accepted: 11/25/2020] [Indexed: 11/09/2022] Open
Abstract
Nonsyndromic hearing loss is genetically heterogeneous. Despite comprehensive genetic testing, many cases remain unsolved because the clinical significance of identified variants is uncertain or because biallelic pathogenic variants are not identified for presumed autosomal recessive cases. Common synonymous variants are often disregarded. Determining the pathogenicity of synonymous variants may improve genetic diagnosis. We report a synonymous variant c.9861 C > T/p.(Gly3287=) in MYO15A in homozygosity or compound heterozygosity with another pathogenic or likely pathogenic MYO15A variant in 10 unrelated families with nonsyndromic sensorineural hearing loss. Biallelic variants in MYO15A were identified in 21 affected and were absent in 22 unaffected siblings. A mini-gene assay confirms that the synonymous variant leads to abnormal splicing. The variant is enriched in the Ashkenazi Jewish population. Individuals carrying biallelic variants involving c.9861 C > T often exhibit progressive post-lingual hearing loss distinct from the congenital profound deafness typically associated with biallelic loss-of-function MYO15A variants. This study establishes the pathogenicity of the c.9861 C > T variant in MYO15A and expands the phenotypic spectrum of MYO15A-related hearing loss. Our work also highlights the importance of multicenter collaboration and data sharing to establish the pathogenicity of a relatively common synonymous variant for improved diagnosis and management of hearing loss.
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Affiliation(s)
- Yoel Hirsch
- Dor Yeshorim, Committee for Prevention of Jewish Genetic Diseases, Brooklyn, NY, 11211, USA
| | - Chayada Tangshewinsirikul
- Division of Maternal Fetal Medicine, Department of Obstetrics and Gynecology, Faculty of Medicine, Ramathibodi Hospital, Mahidol University, Bangkok, 10400, Thailand
- Department of Obstetrics and Gynecology, Brigham and Women's Hospital, Harvard Medical School, Boston, MA, 02115, USA
| | - Kevin T Booth
- Molecular Otolaryngology and Renal Research Laboratories, The University of Iowa, Iowa City, IA, 52242, USA
- Department of Neurobiology, Harvard Medical School, Boston, MA, 02215, USA
| | - Hela Azaiez
- Molecular Otolaryngology and Renal Research Laboratories, The University of Iowa, Iowa City, IA, 52242, USA
| | - Devorah Yefet
- Dor Yeshorim, Committee for Prevention of Jewish Genetic Diseases, Jerusalem, 91506, Israel
| | - Adina Quint
- Dor Yeshorim, Committee for Prevention of Jewish Genetic Diseases, Jerusalem, 91506, Israel
| | - Tzvi Weiden
- Dor Yeshorim, Committee for Prevention of Jewish Genetic Diseases, Jerusalem, 91506, Israel
| | - Zippora Brownstein
- Department of Human Molecular Genetics and Biochemistry, Sackler Faculty of Medicine and Sagol School of Neuroscience, Tel Aviv University, Tel Aviv, 6997801, Israel
| | - Michal Macarov
- Department of Genetics and Metabolic Diseases, Hadassah Medical Center, Jerusalem, 91120, Israel
| | - Bella Davidov
- Department of Medical Genetics, Rabin Medical Center, Petah Tikva, 49100, Israel
| | - John Pappas
- Department of Pediatrics, New York University School of Medicine, New York, NY, 10016, USA
| | - Rachel Rabin
- Department of Pediatrics, New York University School of Medicine, New York, NY, 10016, USA
| | - Margaret A Kenna
- Department of Otolaryngology and Communication Enhancement, Boston Children's Hospital, Harvard Medical School, Boston, MA, 02115, USA
- Harvard Medical School Center for Hereditary Deafness, Boston, MA, 02115, USA
| | - Andrea M Oza
- Department of Otolaryngology and Communication Enhancement, Boston Children's Hospital, Harvard Medical School, Boston, MA, 02115, USA
- Laboratory for Molecular Medicine, Partners HealthCare Personalized Medicine, Cambridge, MA, 02139, USA
| | - Katherine Lafferty
- Laboratory for Molecular Medicine, Partners HealthCare Personalized Medicine, Cambridge, MA, 02139, USA
- Maine Medical Center, Scarborough, ME, 04074, USA
| | - Sami S Amr
- Harvard Medical School Center for Hereditary Deafness, Boston, MA, 02115, USA
- Laboratory for Molecular Medicine, Partners HealthCare Personalized Medicine, Cambridge, MA, 02139, USA
- Department of Pathology, Brigham and Women's Hospital, Harvard Medical School, Boston, MA, 02115, USA
| | - Heidi L Rehm
- Harvard Medical School Center for Hereditary Deafness, Boston, MA, 02115, USA
- Laboratory for Molecular Medicine, Partners HealthCare Personalized Medicine, Cambridge, MA, 02139, USA
- Department of Pathology, Brigham and Women's Hospital, Harvard Medical School, Boston, MA, 02115, USA
- Center for Genomic Medicine, Massachusetts General Hospital, Boston, MA, 02114, USA
- The Broad Institute of MIT and Harvard, Cambridge, MA, 02142, USA
| | - Diana L Kolbe
- Molecular Otolaryngology and Renal Research Laboratories, The University of Iowa, Iowa City, IA, 52242, USA
| | - Kathy Frees
- Molecular Otolaryngology and Renal Research Laboratories, The University of Iowa, Iowa City, IA, 52242, USA
| | - Carla Nishimura
- Molecular Otolaryngology and Renal Research Laboratories, The University of Iowa, Iowa City, IA, 52242, USA
| | - Minjie Luo
- The Children's Hospital of Philadelphia, The University of Pennsylvania Perelman School of Medicine, Philadelphia, PA, 19104, USA
| | - Chantal Farra
- Medical Genetics Unit, American University of Beirut Medical Center, AUBMC, 1107 2020, Beirut, Lebanon
| | - Cynthia C Morton
- Department of Obstetrics and Gynecology, Brigham and Women's Hospital, Harvard Medical School, Boston, MA, 02115, USA
- Harvard Medical School Center for Hereditary Deafness, Boston, MA, 02115, USA
- Department of Pathology, Brigham and Women's Hospital, Harvard Medical School, Boston, MA, 02115, USA
- The Broad Institute of MIT and Harvard, Cambridge, MA, 02142, USA
- Manchester Centre for Audiology and Deafness, School of Health Sciences, The University of Manchester, Manchester, M13 9PL, UK
| | - Sholem Y Scher
- Dor Yeshorim, Committee for Prevention of Jewish Genetic Diseases, Brooklyn, NY, 11211, USA
| | - Josef Ekstein
- Dor Yeshorim, Committee for Prevention of Jewish Genetic Diseases, Brooklyn, NY, 11211, USA
| | - Karen B Avraham
- Department of Human Molecular Genetics and Biochemistry, Sackler Faculty of Medicine and Sagol School of Neuroscience, Tel Aviv University, Tel Aviv, 6997801, Israel.
| | - Richard J H Smith
- Molecular Otolaryngology and Renal Research Laboratories, The University of Iowa, Iowa City, IA, 52242, USA.
| | - Jun Shen
- Harvard Medical School Center for Hereditary Deafness, Boston, MA, 02115, USA.
- Laboratory for Molecular Medicine, Partners HealthCare Personalized Medicine, Cambridge, MA, 02139, USA.
- Department of Pathology, Brigham and Women's Hospital, Harvard Medical School, Boston, MA, 02115, USA.
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Israeli T, Riahi Y, Saada A, Yefet D, Cerasi E, Tirosh B, Leibowitz G. Opposing effects of intracellular versus extracellular adenine nucleotides on autophagy: implications for β-cell function. J Cell Sci 2018; 131:jcs.212969. [PMID: 30002135 DOI: 10.1242/jcs.212969] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/09/2017] [Accepted: 07/03/2018] [Indexed: 11/20/2022] Open
Abstract
AMPK-mTORC1 signaling senses nutrient availability, thereby regulating autophagy. Surprisingly, we found that, in β-cells, the AMPK activator 5-amino-4-imidazolecarboxamide ribofuranoside (AICAR) inhibited, rather than stimulated, autophagy. AICAR is an intermediate in the generation of inosine monophosphate, with subsequent conversion to other purine nucleotides. Adenosine regulated autophagy in a concentration-dependent manner: at high concentrations, it mimicked the AICAR effect on autophagy, whereas at low concentrations it stimulated autophagy through its cognate A1 receptor. Adenosine regulation of autophagy was independent of AMPK or mTORC1 activity. Adenosine kinase (ADK) is the principal enzyme for metabolic adenosine clearance. ADK knockdown and pharmacological inhibition of the enzyme markedly stimulated autophagy in an adenosine A1 receptor-dependent manner. High-concentration adenosine increased insulin secretion in a manner sensitive to treatment with the autophagy inducer Tat-beclin1, and inhibition of autophagy augmented secretion. In conclusion, high concentrations of AICAR or adenosine inhibit autophagy, whereas physiological concentrations of adenosine or inhibition of adenosine clearance by ADK stimulate autophagy via the adenosine receptor. Adenosine might thus be an autocrine regulator of autophagy, independent of AMPK-mTORC1 signaling. Adenosine regulates insulin secretion, in part, through modulation of autophagy.
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Affiliation(s)
- Tal Israeli
- The Diabetes Unit and the Endocrine Service, Hadassah-Hebrew University Medical Center, Jerusalem, 91120, Israel
| | - Yael Riahi
- The Diabetes Unit and the Endocrine Service, Hadassah-Hebrew University Medical Center, Jerusalem, 91120, Israel
| | - Ann Saada
- Monique and Jacques Roboh Department of Genetic Research and the Department of Genetics and Metabolic Diseases, Hadassah-Hebrew University Medical Center, Jerusalem, 91120, Israel
| | - Devorah Yefet
- Monique and Jacques Roboh Department of Genetic Research and the Department of Genetics and Metabolic Diseases, Hadassah-Hebrew University Medical Center, Jerusalem, 91120, Israel
| | - Erol Cerasi
- The Diabetes Unit and the Endocrine Service, Hadassah-Hebrew University Medical Center, Jerusalem, 91120, Israel
| | - Boaz Tirosh
- Institute for Drug Research, the School of Pharmacy, Hebrew University of Jerusalem, Jerusalem, 91120, Israel
| | - Gil Leibowitz
- The Diabetes Unit and the Endocrine Service, Hadassah-Hebrew University Medical Center, Jerusalem, 91120, Israel
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