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Ekhilevitch N, Kurolap A, Oz-Levi D, Mory A, Hershkovitz T, Ast G, Mandel H, Baris HN. Expanding the MYBPC1 phenotypic spectrum: a novel homozygous mutation causes arthrogryposis multiplex congenita. Clin Genet 2016; 90:84-9. [PMID: 26661508 DOI: 10.1111/cge.12707] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/15/2015] [Revised: 12/03/2015] [Accepted: 12/04/2015] [Indexed: 12/30/2022]
Abstract
Arthrogryposis multiplex congenita (AMC) is characterized by heterogeneous nonprogressive multiple joint contractures appearing at birth. We present a consanguineous Israeli-Druze family with several members presenting with AMC. A variable intra-familial phenotype and pected autosomal recessive inheritance prompted molecular diagnosis by whole-exome sequencing. Variant analysis focused on rare homozygous changes, revealed a missense variant in MYBPC1, NM_002465:c.556G>A (p.E286K), affecting the last nucleotide of Exon 8. This novel variant was not observed in the common variant databases and co-segregated as expected within the extended family. MYBPC1 encodes a slow skeletal muscle isoform, essential for muscle contraction. Heterozygous mutations in this gene are associated with distal arthrogryposis types 1b and 2, whereas a homozygous nonsense mutation is implicated in one family with lethal congenital contractural syndrome 4. We present a novel milder MYBPC1 homozygous phenotype.
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Affiliation(s)
- N Ekhilevitch
- The Genetics Institute, Rambam Health Care Campus, Haifa, Israel
| | - A Kurolap
- The Genetics Institute, Rambam Health Care Campus, Haifa, Israel
| | - D Oz-Levi
- The Genetics Institute, Rambam Health Care Campus, Haifa, Israel
| | - A Mory
- The Genetics Institute, Rambam Health Care Campus, Haifa, Israel
| | - T Hershkovitz
- The Genetics Institute, Rambam Health Care Campus, Haifa, Israel
| | - G Ast
- Department of Human Molecular Genetics and Biochemistry, Sackler Faculty of Medicine, Tel-Aviv University, Tel-Aviv, Israel
| | - H Mandel
- Metabolic Unit, Rambam Health Care Campus, Haifa, Israel.,Rappaport School of Medicine, Technion - Israel Institute of Technology, Haifa, Israel
| | - H N Baris
- The Genetics Institute, Rambam Health Care Campus, Haifa, Israel.,Rappaport School of Medicine, Technion - Israel Institute of Technology, Haifa, Israel
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2
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Levi Z, Kariv R, Barnes-Kedar I, Goldberg Y, Half E, Morgentern S, Eli B, Baris HN, Vilkin A, Belfer RG, Niv Y, Elhasid R, Dvir R, Abu-Freha N, Cohen S. The gastrointestinal manifestation of constitutional mismatch repair deficiency syndrome: from a single adenoma to polyposis-like phenotype and early onset cancer. Clin Genet 2014; 88:474-8. [PMID: 25307252 DOI: 10.1111/cge.12518] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/16/2014] [Revised: 09/12/2014] [Accepted: 10/06/2014] [Indexed: 11/30/2022]
Abstract
Data on the clinical presentation of constitutional mismatch repair deficiency syndrome (CMMRD) is accumulating. However, as the extraintestinal manifestations are often fatal and occur at early age, data on the systematic evaluation of the gastrointestinal tract is scarce. Here we describe 11 subjects with verified biallelic carriage and who underwent colonoscopy, upper endoscopy and small bowel evaluation. Five subjects were symptomatic and in six subjects the findings were screen detected. Two subjects had colorectal cancer and few adenomatous polyps (19, 20 years), three subjects had polyposis-like phenotype (13, 14, 16 years), four subjects had few adenomatous polyps (8, 12-14 years) and two subjects had no polyps (both at age 6). Of the three subjects in the polyposis-like group, two subjects had already developed high-grade dysplasia or cancer and one subject had atypical juvenile polyps suggesting juvenile polyposis. Three out of the five subjects that underwent repeated exams had significant findings during short interval. The gastrointestinal manifestations of CMMRD are highly dependent upon age of examination and highly variable. The polyps may also resemble juvenile polyposis. Intensive surveillance according to current guidelines is mandatory.
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Affiliation(s)
- Z Levi
- The Early Detection and High Risk GI Cancer Service, the Gastroenterology Division, Rabin Medical Center, Petach Tikva, Israel.,Sackler School of Medicine, Tel Aviv University, Tel Aviv, Israel
| | - R Kariv
- Sackler School of Medicine, Tel Aviv University, Tel Aviv, Israel.,Department of Gastroenterology, Tel Aviv Sourasky Medical Center, Tel Aviv, Israel
| | - I Barnes-Kedar
- The Raphael Recanati Genetics Institute, Rabin Medical Center, Beilinson Hospital, Petach Tikva, Israel
| | - Y Goldberg
- The Sharett Institute for Oncology, Hadassah-Hebrew University Medical Center, Jerusalem, Israel
| | - E Half
- Gastroenterology Department, Rambam Health Care Campus, Haifa, Israel
| | - S Morgentern
- Pathology Department, Rabin Medical Center, Petach Tikva, Israel
| | - B Eli
- Pathology Department, Tel Aviv Sourasky Medical Center, Tel Aviv, Israel
| | - H N Baris
- Sackler School of Medicine, Tel Aviv University, Tel Aviv, Israel.,The Raphael Recanati Genetics Institute, Rabin Medical Center, Beilinson Hospital, Petach Tikva, Israel
| | - A Vilkin
- The Early Detection and High Risk GI Cancer Service, the Gastroenterology Division, Rabin Medical Center, Petach Tikva, Israel
| | - R G Belfer
- The Early Detection and High Risk GI Cancer Service, the Gastroenterology Division, Rabin Medical Center, Petach Tikva, Israel
| | - Y Niv
- The Early Detection and High Risk GI Cancer Service, the Gastroenterology Division, Rabin Medical Center, Petach Tikva, Israel.,Sackler School of Medicine, Tel Aviv University, Tel Aviv, Israel
| | - R Elhasid
- Pediatric Hemato-Oncology Department, Tel Aviv, Israel
| | - R Dvir
- The Pediatric Gastroenterology Unit, 'Dana-Dwek' Children's Hospital, Tel Aviv Medical Center, Tel Aviv, Israel
| | - N Abu-Freha
- Gastroenterology Department, Soroka Medical Center, Beersheba, Israel
| | - S Cohen
- Sackler School of Medicine, Tel Aviv University, Tel Aviv, Israel.,The Pediatric Gastroenterology Unit, 'Dana-Dwek' Children's Hospital, Tel Aviv Medical Center, Tel Aviv, Israel
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Melamed O, Behar DM, Bram C, Magal N, Pras E, Reznik-Wolf H, Borochowitz ZU, Davidov B, Mor-Cohen R, Baris HN. Founder mutation for Huntington disease in Caucasus Jews. Clin Genet 2014; 87:167-72. [PMID: 24405192 DOI: 10.1111/cge.12344] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/01/2013] [Revised: 01/05/2014] [Accepted: 01/06/2014] [Indexed: 11/29/2022]
Abstract
Huntington disease (HD), an autosomal dominant disorder involving HTT, is characterized by chorea, psychiatric illness and cognitive decline. Diagnosis and age of onset depend on the degree of expansion of the trinucleotide CAG repeat within the gene. The prevalence of HD is known for Europeans but has not been studied in the Israeli population. Between 2006 and 2011 we diagnosed in our adult genetics clinic ten HD probands, nine of whom were Caucasus Jews (CJ) (Azerbaijani), and one Ashkenazi Jewish. We performed haplotype analysis to look for evidence of a founder mutation, and found that of the nine CJ, eight shared the same haplotype that was compatible with the A1 haplogroup. We calculated the coalescence age of the mutation to be between 80 and 150 years. Ninety percent of our HD patients are CJ, as are 27% of the HD patients in Israel, although the CJ comprise only 1.4% of the Israeli population. Our findings suggest a higher prevalence of HD among CJ compared to the general Israeli population and are consistent with a recent founder mutation. We recommend a higher degree of suspicion for HD in CJ with subtle clinical findings.
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Affiliation(s)
- O Melamed
- The Raphael Recanati Genetic Institute, Rabin Medical Center, Beilinson Hospital, Petah Tikva, Israel
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