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Terabayashi T, Hashimoto S. Increased unfolded protein responses caused by MED17 mutations. Neurogenetics 2021; 22:353-357. [PMID: 34392449 DOI: 10.1007/s10048-021-00661-6] [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] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/01/2021] [Accepted: 07/20/2021] [Indexed: 11/26/2022]
Abstract
Mediator (MED) is a key regulator of protein-coding gene expression, and mutations in MED subunits are associated with a broad spectrum of diseases. Because mutations in MED17 result in autosomal recessive disorders, including microcephaly, intellectual disability, epilepsy, and ataxia, which are barely reported, with only three case reports to date, genotype-phenotype association should be elucidated. Here, we investigated the impact of MED17 mutations on cellular responses and found increased unfolded protein responses (UPRs) in fibroblasts derived from Japanese patients with MED17 mutations. The expression of the UPR genes CHOP and ATF4 was upregulated, and the phosphorylation of eIF2a was basally increased in patients' cells. Based on our findings, we propose that increased UPRs caused by MED17 mutations might contribute to the clinical phenotype.
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Affiliation(s)
- Takeshi Terabayashi
- Department of Pharmacology, Faculty of Medicine, Oita University, 1-1 Idaigaoka, Hasama, Yufu, Oita, 879-5593, Japan
| | - Satoru Hashimoto
- Faculty of Science and Technology, Oita University, 700 Dannoharu, Oita, 870-1192, Japan.
- Clinical Research Center for Diabetes, Tokushima University Hospital, Tokushima, 770-8503, Japan.
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Fattal-Valevski A, Ben Sira L, Lerman-Sagie T, Strausberg R, Bloch-Mimouni A, Edvardson S, Kaufman R, Chernuha V, Schneebaum Sender N, Heimer G, Ben Zeev B. Delineation of the phenotype of MED17-related disease in Caucasus-Jewish families. Eur J Paediatr Neurol 2021; 32:40-45. [PMID: 33756211 DOI: 10.1016/j.ejpn.2020.08.011] [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] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/28/2019] [Revised: 08/10/2020] [Accepted: 08/17/2020] [Indexed: 10/22/2022]
Abstract
BACKGROUND and Purpose: Postnatal progressive microcephaly, with seizures and brain atrophy (OMIM # 613668) is a rare disorder caused by a homozygous founder missense mutation c.1112T>C (p.L371P) in the MED17 gene on chromosome 11 that was identified in 2010 in Caucasus Jewish families. The present study aimed to delineate the phenotype and developmental outcomes in patients diagnosed with this mutation to date. METHODS We conducted a medical charts review to collect the clinical, laboratory and neuroimaging findings in patients from several unrelated families of Caucasus-Jewish origin, who were diagnosed with the same homozygous c.1112T>C MED17 mutation. RESULTS The study cohort, including the previously reported patients, comprised 10 males and 5 females from 11 families. All subjects had at birth a normal head circumference, which steeply declined to -6SD within a few months. None of the patients achieved developmental milestones. All patients had progressive spasticity and were wheelchair bound due to spastic quadriplegia. All of them eventually developed profound intellectual disability. Epilepsy of varied severity was present in all patients. Most patients required enteral feeding due to aspirations. Eight patients died before puberty (age range 2-13 years). Brain MRI showed marked cerebral atrophy and early prominent cerebellar atrophy (vermian > hemispheres) accompanied by pontine ventral flattening. CONCLUSIONS The founder c.1112T>C mutation in MED17 gene is expressed by a unique and homogeneous clinical phenotype with distinctive MRI findings. This mutation should be considered in patients of Caucasus-Jewish ancestry presenting with clinical features and a MRI pattern of progressive cerebral and cerebellar atrophy.
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Affiliation(s)
- Aviva Fattal-Valevski
- Pediatric Neurology, Tel Aviv Sourasky Medical Center, Sackler Faculty of Medicine, Tel Aviv University, Israel.
| | - Liat Ben Sira
- Department of Radiology, Tel Aviv Sourasky Medical Center, Sackler Faculty of Medicine, Tel Aviv University, Israel
| | - Tally Lerman-Sagie
- Pediatric Neurology, Fetal Neurology Clinic, Obstetrics-Gynecology Ultrasound Unit, Department of Obstetrics and Gynecology, Wolfson Medical Center, Holon, Israel; Sackler Faculty of Medicine, Tel Aviv University, Tel Aviv, Israel
| | - Rachel Strausberg
- Sackler Faculty of Medicine, Tel Aviv University, Tel Aviv, Israel; Pediatric Neurology, Schneider Children's Medical Center, Petach Tikva, Israel
| | - Aviva Bloch-Mimouni
- Sackler Faculty of Medicine, Tel Aviv University, Tel Aviv, Israel; Pediatric Neurology and Developmental Unit, Loewenstein Rehabilitation Hospital, Raanana, Israel
| | - Simon Edvardson
- Pediatric Neurology, Hadassah Medical Center, Hebrew University of Jerusalem, Jerusalem, Israel; Monique and Jacques Roboh Department of Genetic Research, Hadassah Medical Center, Hebrew University of Jerusalem, Jerusalem, Israel
| | - Rami Kaufman
- Monique and Jacques Roboh Department of Genetic Research, Hadassah Medical Center, Hebrew University of Jerusalem, Jerusalem, Israel
| | - Veronika Chernuha
- Pediatric Neurology, Tel Aviv Sourasky Medical Center, Sackler Faculty of Medicine, Tel Aviv University, Israel
| | - Nira Schneebaum Sender
- Pediatric Neurology, Tel Aviv Sourasky Medical Center, Sackler Faculty of Medicine, Tel Aviv University, Israel
| | - Gali Heimer
- Sackler Faculty of Medicine, Tel Aviv University, Tel Aviv, Israel; Edmond and Lily Safra Children's Hospital, Chaim Sheba Medical Center, Ramat Gan, Israel
| | - Bruria Ben Zeev
- Sackler Faculty of Medicine, Tel Aviv University, Tel Aviv, Israel; Edmond and Lily Safra Children's Hospital, Chaim Sheba Medical Center, Ramat Gan, Israel
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