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Birnbaum R, Ezer S, Lotan NS, Eilat A, Sternlicht K, Benyamini L, Reish O, Falik-Zaccai T, Ben-Gad G, Rod R, Segel R, Kim K, Burton B, Keegan CE, Wagner M, Henderson LB, Mor N, Barel O, Hirsch Y, Meiner V, Elpeleg O, Harel T, Mor-Shakad H. Intellectual disability syndrome associated with a homozygous founder variant in SGSM3 in Ashkenazi Jews. J Med Genet 2024; 61:289-293. [PMID: 37833060 DOI: 10.1136/jmg-2023-109504] [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: 07/10/2023] [Accepted: 09/25/2023] [Indexed: 10/15/2023]
Abstract
BACKGROUND Neurodevelopmental disorders (NDDs) impact both the development and functioning of the brain and exhibit clinical and genetic variability. RAP and RAB proteins, belonging to the RAS superfamily, are identified as established contributors to NDDs. However, the involvement of SGSM (small G protein signalling modulator), another member of the RAS family, in NDDs has not been previously documented. METHODS Proband-only or trio exome sequencing was performed on DNA samples obtained from affected individuals and available family members. The variant prioritisation process focused on identifying rare deleterious variants. International collaboration aided in the identification of additional affected individuals. RESULTS We identified 13 patients from 8 families of Ashkenazi Jewish origin who all carried the same homozygous frameshift variant in SGSM3 gene. The variant was predicted to cause a loss of function, potentially leading to impaired protein structure or function. The variant co-segregated with the disease in all available family members. The affected individuals displayed mild global developmental delay and mild to moderate intellectual disability. Additional prevalent phenotypes observed included hypotonia, behavioural challenges and short stature. CONCLUSIONS An Ashkenazi Jewish homozygous founder variant in SGSM3 was discovered in individuals with NDDs and short stature. This finding establishes a connection between another member of the RAS family and NDDs. Additional research is needed to uncover the specific molecular mechanisms by which SGSM3 influences neurodevelopmental processes and the regulation of growth.
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Affiliation(s)
- Rivka Birnbaum
- Department of Genetics, Hadassah Medical Center, Jerusalem, Israel
| | - Shlomit Ezer
- Faculty of Medicine, Hebrew University of Jerusalem, Jerusalem, Israel
| | - Nava Shaul Lotan
- Department of Genetics, Hadassah Medical Center, Jerusalem, Israel
| | - Avital Eilat
- Department of Genetics, Hadassah Medical Center, Jerusalem, Israel
| | | | | | - Orit Reish
- Genetics Institute, Shamir Medical Center, Tzrifin, Israel
- Sackler School of Medicine, Tel Aviv University, Tel Aviv, Israel
| | - Tzipora Falik-Zaccai
- Institute of Human Genetics, Western Galilee Hospital-Nahariya, Nahariya, Israel
| | - Gali Ben-Gad
- Department of Child Development, Galilee Medical Center, Nahariya, Israel
| | - Raya Rod
- The Center for Child Development and Pediatric Neurology, Western Galilee Hospital-Naharyia, Nahariya, Israel
| | | | - Katherine Kim
- Genetics, Ann and Robert H Lurie Children's Hospital of Chicago, Chicago, Illinois, USA
- Pediatrics, Northwestern University Feinberg School of Medicine, Chicago, Illinois, USA
| | - Barabra Burton
- Ann & Robert H. Lurie Children's Hospital of Chicago, Chicago, Illinois, USA
| | - Catherine E Keegan
- Department of Pediatrics, University of Michigan, Ann Arbor, Michigan, USA
| | - Mallory Wagner
- Department of Pediatrics, University of Michigan, Ann Arbor, Michigan, USA
| | | | - Nofar Mor
- The Genomic Unit, Sheba Cancer Research Center, Sheba Medical Center, Tel Hashomer, Israel
| | - Ortal Barel
- The Genomic Unit, Sheba Cancer Research Center, Sheba Medical Center, Tel Hashomer, Israel
| | - Yoel Hirsch
- Research, Dor Yeshroim, Brooklyn, New York, USA
- Dor Yeshorim, New York, New York, USA
| | - Vardiella Meiner
- Faculty of Medicine, Hebrew University of Jerusalem, Jerusalem, Israel
- Department of Genetics, Hadassah Medical Center, Jerusalem, Jerusalem, Israel
| | - Orly Elpeleg
- Faculty of Medicine, Hebrew University of Jerusalem, Jerusalem, Israel
- Department of Genetics, Hadassah Medical Center, Jerusalem, Jerusalem, Israel
| | - Tamar Harel
- Faculty of Medicine, Hebrew University of Jerusalem, Jerusalem, Israel
- Department of Genetics, Hadassah Medical Center, Jerusalem, Jerusalem, Israel
| | - Hagar Mor-Shakad
- Department of Genetics, Hadassah Medical Center, Jerusalem, Israel
- Faculty of Medicine, Hebrew University of Jerusalem, Jerusalem, Israel
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2
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Bergson S, Daniely D, Bomze D, Mohamad J, Malovitski K, Meijers O, Briskin V, Bihari O, Malchin N, Israeli S, Mashiah J, Falik-Zaccai T, Avitan-Hersh E, Eskin-Schwartz M, Allon-Shalev S, Sarig O, Sprecher E, Samuelov L. Clinical and molecular features in a cohort of Middle Eastern patients with epidermolysis bullosa. Pediatr Dermatol 2023; 40:1021-1027. [PMID: 37827535 DOI: 10.1111/pde.15440] [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] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/30/2023] [Accepted: 09/10/2023] [Indexed: 10/14/2023]
Abstract
BACKGROUND Epidermolysis bullosa (EB) features skin and mucosal fragility due to pathogenic variants in genes encoding components of the cutaneous basement membrane. Based on the level of separation within the dermal-epidermal junction, EB is sub-classified into four major types including EB simplex (EBS), junctional EB (JEB), dystrophic EB (DEB), and Kindler EB (KEB) with 16 EB-associated genes reported to date. METHODS We ascertained a cohort of 151 EB patients of various Middle Eastern ethnic backgrounds. RESULTS The cohort was comprised of EBS (64%, 97/151), DEB (21%, 31/151), JEB (12%, 18/151), and KEB (3%, 5/151). KRT14 and KRT5 variants were most common among EBS patients with 43% (42/97) and 46% (45/97) of EBS patients carrying mutations in either of these two genes, respectively. Truncal involvement was more common in KRT14-associated EBS as compared to EBS due to KRT5 mutations (p < .05). Mutations in COL17A1 and laminin 332-encoding genes were identified in 55% (10/18) and 45% (8/18) of JEB patients. Scarring alopecia, caries, and EB nevi were most common among JEB patients carrying COL17A1 mutations as compared to laminin 332-associated JEB (p < .05). Abnormal nails were evident in most DEB and JEB patients while poikiloderma was exclusively observed in KEB (p < .001). CONCLUSIONS EB patients of Middle Eastern origin were found to feature specific phenotype-genotype correlations of relevance to the diagnosis and genetic counseling of patients in this region.
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Affiliation(s)
- Shir Bergson
- Division of Dermatology, Tel Aviv Sourasky Medical Center, Tel Aviv, Israel
- Faculty of Medicine, Tel Aviv University, Tel Aviv, Israel
| | - Daniel Daniely
- Division of Dermatology, Tel Aviv Sourasky Medical Center, Tel Aviv, Israel
| | - David Bomze
- Division of Dermatology, Tel Aviv Sourasky Medical Center, Tel Aviv, Israel
| | - Janan Mohamad
- Division of Dermatology, Tel Aviv Sourasky Medical Center, Tel Aviv, Israel
- Faculty of Medicine, Tel Aviv University, Tel Aviv, Israel
| | - Kiril Malovitski
- Division of Dermatology, Tel Aviv Sourasky Medical Center, Tel Aviv, Israel
- Faculty of Medicine, Tel Aviv University, Tel Aviv, Israel
| | - Odile Meijers
- Division of Dermatology, Tel Aviv Sourasky Medical Center, Tel Aviv, Israel
| | - Valeria Briskin
- Division of Dermatology, Tel Aviv Sourasky Medical Center, Tel Aviv, Israel
| | - Ofer Bihari
- Division of Dermatology, Tel Aviv Sourasky Medical Center, Tel Aviv, Israel
| | - Natalia Malchin
- Division of Dermatology, Tel Aviv Sourasky Medical Center, Tel Aviv, Israel
| | - Shirli Israeli
- Division of Dermatology, Tel Aviv Sourasky Medical Center, Tel Aviv, Israel
| | - Jacob Mashiah
- Division of Dermatology, Tel Aviv Sourasky Medical Center, Tel Aviv, Israel
- Faculty of Medicine, Tel Aviv University, Tel Aviv, Israel
| | - Tzipora Falik-Zaccai
- Institute of Human Genetics, Galilee Medical Center, Nahariya, Israel
- The Azrieli Faculty of Medicine, Bar Ilan University, Safed, Israel
| | - Emily Avitan-Hersh
- Department of Dermatology, Rambam Health Care Campus, Haifa, Israel
- Bruce and Ruth Rappaport Faculty of Medicine, Haifa, Israel
| | - Marina Eskin-Schwartz
- Faculty of Health Sciences, Ben-Gurion University of the Negev, Beer-Sheva, Israel
- Genetics Institute, Soroka University Medical Center, Beer-Sheva, Israel
| | - Stavit Allon-Shalev
- Bruce and Ruth Rappaport Faculty of Medicine, Haifa, Israel
- The Genetic Institute, Emek Medical Center, Afula, Israel
| | - Ofer Sarig
- Division of Dermatology, Tel Aviv Sourasky Medical Center, Tel Aviv, Israel
| | - Eli Sprecher
- Division of Dermatology, Tel Aviv Sourasky Medical Center, Tel Aviv, Israel
- Faculty of Medicine, Tel Aviv University, Tel Aviv, Israel
| | - Liat Samuelov
- Division of Dermatology, Tel Aviv Sourasky Medical Center, Tel Aviv, Israel
- Faculty of Medicine, Tel Aviv University, Tel Aviv, Israel
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Mishmar D, Carmel L, Shema E, Falik-Zaccai T. Universities should denounce terrorism and antisemitism. Nature 2023; 623:483. [PMID: 37964061 DOI: 10.1038/d41586-023-03540-2] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2023]
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4
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Bergson S, Daniely D, Bomze D, Falik-Zaccai T, Avitan-Hersh E, Shalev S, Schwartz ME, Sarig O, Sprecher E, Samuelov L. 073 Molecular epidemiology of epidermolysis bullosa in a Middle Eastern population. J Invest Dermatol 2021. [DOI: 10.1016/j.jid.2021.08.075] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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5
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Staretz-Chacham O, Daas S, Ulanovsky I, Blau A, Rostami N, Saraf-Levy T, Abu Salah N, Anikster Y, Banne E, Dar D, Dumin E, Fattal-Valevski A, Falik-Zaccai T, Hershkovitz E, Josefsberg S, Khammash H, Keidar R, Korman SH, Landau Y, Lerman-Sagie T, Mandel D, Mandel H, Marom R, Morag I, Nadir E, Yosha-Orpaz N, Pode-Shakked B, Pras E, Reznik-Wolf H, Saada A, Segel R, Shaag A, Shaul Lotan N, Spiegel R, Tal G, Vaisid T, Zeharia A, Almashanu S. The role of orotic acid measurement in routine newborn screening for urea cycle disorders. J Inherit Metab Dis 2021; 44:606-617. [PMID: 33190319 DOI: 10.1002/jimd.12331] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/22/2020] [Revised: 11/09/2020] [Accepted: 11/11/2020] [Indexed: 12/27/2022]
Abstract
Urea cycle disorders (UCDs), including OTC deficiency (OTCD), are life-threatening diseases with a broad clinical spectrum. Early diagnosis and initiation of treatment based on a newborn screening (NBS) test for OTCD with high specificity and sensitivity may contribute to reduction of the significant complications and high mortality. The efficacy of incorporating orotic acid determination into routine NBS was evaluated. Combined measurement of orotic acid and citrulline in archived dried blood spots from newborns with urea cycle disorders and normal controls was used to develop an algorithm for routine NBS for OTCD in Israel. Clinical information and genetic confirmation results were obtained from the follow-up care providers. About 1147986 newborns underwent routine NBS including orotic acid determination, 25 of whom were ultimately diagnosed with a UCD. Of 11 newborns with OTCD, orotate was elevated in seven but normal in two males with early-onset and two males with late-onset disease. Orotate was also elevated in archived dried blood spots of all seven retrospectively tested historical OTCD patients, only three of whom had originally been identified by NBS with low citrulline and elevated glutamine. Among the other UCDs emerge, three CPS1D cases and additional three retrospective CPS1D cases otherwise reported as a very rare condition. Combined levels of orotic acid and citrulline in routine NBS can enhance the detection of UCD, especially increasing the screening sensitivity for OTCD and differentiate it from CPS1D. Our data and the negligible extra cost for orotic acid determination might contribute to the discussion on screening for proximal UCDs in routine NBS.
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Affiliation(s)
- Orna Staretz-Chacham
- Metabolic Clinic, Pediatric Division, Soroka University Medical Center, Ben Gurion University, Beer Sheva, Israel
| | - Suha Daas
- National Newborn Screening Program, Ministry of Health, Tel-HaShomer, Ramat Gan, Israel
| | - Igor Ulanovsky
- National Newborn Screening Program, Ministry of Health, Tel-HaShomer, Ramat Gan, Israel
| | - Ayala Blau
- National Newborn Screening Program, Ministry of Health, Tel-HaShomer, Ramat Gan, Israel
- Nursing Department, School of Health Sciences, Ariel University, Ariel, Israel
| | - Nira Rostami
- National Newborn Screening Program, Ministry of Health, Tel-HaShomer, Ramat Gan, Israel
| | - Talya Saraf-Levy
- National Newborn Screening Program, Ministry of Health, Tel-HaShomer, Ramat Gan, Israel
| | - Nasser Abu Salah
- Department of Neonatology, Red Crescent Society Hospital, Jerusalem, Israel
- Department of Neonatology, Shaare Zedek Medical Center, Jerusalem, Israel
| | - Yair Anikster
- Edmond and Lily Safra Children's Hospital, Sheba Medical Center, Tel-Hashomer, Israel
- Sackler School of Medicine, Tel Aviv University, Tel-Aviv, Israel
| | - Ehud Banne
- Genetics Institute, Kaplan Medical Center, Rehovot, Israel
| | - Dalit Dar
- Department of Clinical Biochemistry, Rambam Health Care Campus, Haifa, Israel
| | - Elena Dumin
- Department of Clinical Biochemistry, Rambam Health Care Campus, Haifa, Israel
- Ruth & Bruce Rappaport Faculty of Medicine, Technion-Israel Institute of Technology, Haifa, Israel
| | - Aviva Fattal-Valevski
- Sackler School of Medicine, Tel Aviv University, Tel-Aviv, Israel
- Pediatric Neurology Unit, Dana Children Hospital, Tel Aviv Sourasky Medical Center, Tel Aviv, Israel
| | - Tzipora Falik-Zaccai
- Institute of Human Genetics, The Galilee Medical Center, Naharia, Israel
- The Azrieli Faculty of Medicine, Bar Ilan, Israel
| | - Eli Hershkovitz
- Pediatric D Department, Soroka Medical Center, Beer Sheva, Israel
- Faculty of Health Sciences, Ben-Gurion University, Beer Sheva, Israel
| | | | - Hatem Khammash
- Department of Neonatology, Makassed Islamic Hospital, Jerusalem, Israel
| | - Rimona Keidar
- Pediatric Department, Shamir Medical Center (Assaf Harofeh), Zerifin, Israel, affiliated to the Sackler Faculty of Medicine, Tel Aviv University, Tel Aviv, Israel
| | - Stanley H Korman
- Wilf Children's Hospital, Shaare Zedek Medical Center, Jerusalem, Israel
- Metabolic Unit, Ruth Rappaport Children's Hospital, Rambam Health Care Campus, Haifa, Israel
| | - Yuval Landau
- Metabolic Disease Unit, Schneider Children's Medical Center of Israel, Tel Aviv University, Israel
| | - Tally Lerman-Sagie
- Sackler School of Medicine, Tel Aviv University, Tel-Aviv, Israel
- Pediatric Neurology Unit, Metabolic Neurogenetic Service, Wolfson Medical Center, Holon, Israel
| | - Dror Mandel
- Sackler School of Medicine, Tel Aviv University, Tel-Aviv, Israel
| | - Hanna Mandel
- Ruth & Bruce Rappaport Faculty of Medicine, Technion-Israel Institute of Technology, Haifa, Israel
- Metabolic Unit, Ruth Rappaport Children's Hospital, Rambam Health Care Campus, Haifa, Israel
| | - Ronella Marom
- Department of Neonatology, Dana Dwek Children's Hospital, Tel Aviv Medical Center, Affiliated to Sackler School of Medicine, Tel-Aviv University, Tel-Aviv, Israel
| | - Iris Morag
- Pediatric Department, Shamir Medical Center (Assaf Harofeh), Zerifin, Israel, affiliated to the Sackler Faculty of Medicine, Tel Aviv University, Tel Aviv, Israel
| | - Erez Nadir
- Ruth & Bruce Rappaport Faculty of Medicine, Technion-Israel Institute of Technology, Haifa, Israel
- Department of Neonatology, Hillel Yaffe Medical Center, Hadera, Israel
| | - Naama Yosha-Orpaz
- Pediatric Neurology Unit, Metabolic Neurogenetic Service, Wolfson Medical Center, Holon, Israel
| | - Ben Pode-Shakked
- Edmond and Lily Safra Children's Hospital, Sheba Medical Center, Tel-Hashomer, Israel
- Sackler School of Medicine, Tel Aviv University, Tel-Aviv, Israel
| | - Elon Pras
- The Danek Gertner Institute of Human Genetics, Sheba Medical Center, Ramat Gan, Israel
- Department of Genetics, Hadassah-Hebrew University Medical Center, Jerusalem, Israel
| | - Haike Reznik-Wolf
- The Danek Gertner Institute of Human Genetics, Sheba Medical Center, Ramat Gan, Israel
| | - Ann Saada
- Department of Genetics, Hadassah-Hebrew University Medical Center, Jerusalem, Israel
- Hebrew University School of Medicine, Jerusalem, Israel
| | - Reeval Segel
- Hebrew University School of Medicine, Jerusalem, Israel
- Medical Genetics Institute, Shaare Zedek Medical Center, Jerusalem, Israel
| | - Avraham Shaag
- Department of Genetics, Hadassah-Hebrew University Medical Center, Jerusalem, Israel
| | - Nava Shaul Lotan
- Department of Genetics, Hadassah-Hebrew University Medical Center, Jerusalem, Israel
| | - Ronen Spiegel
- Ruth & Bruce Rappaport Faculty of Medicine, Technion-Israel Institute of Technology, Haifa, Israel
- Department of Pediatrics B, Metabolic Service, Emek Medical Center, Afula, Israel
| | - Galit Tal
- Metabolic Unit, Ruth Rappaport Children's Hospital, Rambam Health Care Campus, Haifa, Israel
| | - Taly Vaisid
- Metabolic Laboratory, Sheba Medical Center, Tel-HaShomer, Ramat Gan, Israel
| | - Avi Zeharia
- Metabolic Disease Unit, Schneider Children's Medical Center of Israel, Tel Aviv University, Israel
| | - Shlomo Almashanu
- National Newborn Screening Program, Ministry of Health, Tel-HaShomer, Ramat Gan, Israel
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Sagi-Dain L, Singer A, Falik-Zaccai T, Peleg A, Bar-Shira A, Feingold-Zadok M, Ben Shachar S, Maya I. The effect of polyhydramnios degree on chromosomal microarray results: a retrospective cohort analysis of 742 singleton pregnancies. Arch Gynecol Obstet 2021; 304:649-656. [PMID: 33591382 DOI: 10.1007/s00404-021-05995-y] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [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: 06/01/2020] [Accepted: 02/02/2021] [Indexed: 11/25/2022]
Abstract
PURPOSE To analyze the risk for clinically significant microarray aberrations in pregnancies with polyhydramnios. METHODS Data from all chromosomal microarray analyses (CMA) performed due to polyhydramnios between January 2013 and December 2019 were retrospectively obtained from the Ministry of Health Database. The rate of clinically significant (pathogenic and likely pathogenic) CMA findings in isolated and non-isolated polyhydramnios cohorts was compared to a local control group of 5541 fetuses with normal ultrasound, in which 78 (1.4%) abnormal results were demonstrated. Subgroup analyses were performed by the degree of polyhydramnios, week of diagnosis, maternal age, and the presence of additional sonographic anomalies. RESULTS In the isolated polyhydramnios cohort, 19/623 (3.1%) clinically significant CMA aberrations were noted, a significantly higher rate compared to the control population. However, the risk for abnormal CMA results in the 158 cases with mild polyhydramnios (AFI 25-29.9, or maximal vertical pocket 8-11.9 cm) did not significantly differ from pregnancies with normal ultrasound. Of 119 cases of non-isolated polyhydramnios (most frequently associated with cardiovascular (26.1%) and brain (15.1%) anomalies), 8 (6.7%) abnormal CMA findings were noted, mainly karyotype-detectable. CONCLUSION Mild polyhydramnios was not associated with an increased rate of clinically significant microarray results, compared to pregnancies with normal ultrasound. An extensive anatomical sonographic survey should be performed in pregnancies with polyhydramnios, with consideration of fetal echocardiography.
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Affiliation(s)
- Lena Sagi-Dain
- Genetics Institute, Carmel Medical Center, Affiliated to the Ruth and Bruce Rappaport Faculty of Medicine, Technion-Israel Institute of Technology, Haifa, Israel.
| | - Amihood Singer
- Community Genetics, Public Health Services, Ministry of Health, Jerusalem, Israel
| | - Tzipora Falik-Zaccai
- Institute of Human Genetics, Galilee Medical Center, Nahariya, Israel.,The Azrieli Faculty of Medicine, Bar-Ilan, Safed, Israel
| | - Amir Peleg
- Genetics Institute, Carmel Medical Center, Affiliated to the Ruth and Bruce Rappaport Faculty of Medicine, Technion-Israel Institute of Technology, Haifa, Israel
| | - Anat Bar-Shira
- The Genetic Institute, Tel Aviv Sourasky Medical Center, Tel Aviv, Israel
| | | | - Shay Ben Shachar
- The Genetic Institute, Tel Aviv Sourasky Medical Center, Tel Aviv, Israel.,Sackler Faculty of Medicine, Tel Aviv University, Tel Aviv, Israel
| | - Idit Maya
- Sackler Faculty of Medicine, Tel Aviv University, Tel Aviv, Israel.,Recanati Genetics Institute, Beilinson Hospital, Rabin Medical Center, Petah Tikva, Israel
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7
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Banne E, Falik-Zaccai T, Brielle E, Kalfon L, Ladany H, Klinger D, Schneidman-Duhovny D, Linial M. De novo STXBP1 mutation in a child with developmental delay and spasticity reveals a major structural alteration in the interface with syntaxin 1A. Am J Med Genet B Neuropsychiatr Genet 2020; 183:412-422. [PMID: 32815282 DOI: 10.1002/ajmg.b.32816] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [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: 12/21/2019] [Revised: 06/09/2020] [Accepted: 07/08/2020] [Indexed: 01/19/2023]
Abstract
STXBP1, also known as Munc-18, is a master regulator of neurotransmitter release and synaptic function in the human brain through its direct interaction with syntaxin 1A. STXBP1 binds syntaxin 1A is an inactive conformational state. STXBP1 decreases its binding affinity to syntaxin upon phosphorylation, enabling syntaxin 1A to engage in the SNARE complex, leading to neurotransmitter release. STXBP1-related disorders are well characterized by encephalopathy with epilepsy, and a diverse range of neurological and neurodevelopmental conditions. Through exome sequencing of a child with developmental delay, hypotonia, and spasticity, we found a novel de novo insertion mutation of three nucleotides in the STXBP1 coding region, resulting in an additional arginine after position 39 (R39dup). Inconclusive results from state-of-the-art variant prediction tools mandated a structure-based approach using molecular dynamics (MD) simulations of the STXBP1-syntaxin 1A complex. Comparison of the interaction interfaces of the wild-type and the R39dup complexes revealed a reduced interaction surface area in the mutant, leading to destabilization of the protein complex. Moreover, the decrease in affinity toward syntaxin 1A is similar for the phosphorylated STXBP1 and the R39dup. We applied the same MD methodology to seven additional previously reported STXBP1 mutations and reveal that the stability of the STXBP1-syntaxin 1A interface correlates with the reported clinical phenotypes. This study provides a direct link between the outcome of a novel variant in STXBP1 and protein structure and dynamics. The structural change upon mutation drives an alteration in synaptic function.
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Affiliation(s)
- Ehud Banne
- The Genetics Institute, Kaplan Medical Center - Rehovot, Hebrew University and Hadassah Medical School, Jerusalem, Israel
| | - Tzipora Falik-Zaccai
- Institute of Human Genetics, Galilee Medical Center, Naharia, Israel.,Azrieli Faculty of Medicine in the Galilee, Bar Ilan University, Safed, Israel
| | - Esther Brielle
- Department of Biological Chemistry, Institute of Life Sciences, The Hebrew University of Jerusalem, Jerusalem, Israel.,The Alexander Grass Center for Bioengineering, The Hebrew University of Jerusalem, Jerusalem, Israel
| | - Limor Kalfon
- Institute of Human Genetics, Galilee Medical Center, Naharia, Israel
| | - Hagay Ladany
- Institute of Human Genetics, Galilee Medical Center, Naharia, Israel
| | - Danielle Klinger
- Department of Biological Chemistry, Institute of Life Sciences, The Hebrew University of Jerusalem, Jerusalem, Israel
| | - Dina Schneidman-Duhovny
- Department of Biological Chemistry, Institute of Life Sciences, The Hebrew University of Jerusalem, Jerusalem, Israel.,The Rachel and Selim Benin School of Computer Science and Engineering, The Hebrew University of Jerusalem, Jerusalem, Israel
| | - Michal Linial
- Department of Biological Chemistry, Institute of Life Sciences, The Hebrew University of Jerusalem, Jerusalem, Israel
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8
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Neerman N, Faust G, Meeks N, Modai S, Kalfon L, Falik-Zaccai T, Kaplun A. A clinically validated whole genome pipeline for structural variant detection and analysis. BMC Genomics 2019; 20:545. [PMID: 31307387 PMCID: PMC6631445 DOI: 10.1186/s12864-019-5866-z] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022] Open
Abstract
Background With the continuing decrease in cost of whole genome sequencing (WGS), we have already approached the point of inflection where WGS testing has become economically feasible, facilitating broader access to the benefits that are helping to define WGS as the new diagnostic standard. WGS provides unique opportunities for detection of structural variants; however, such analyses, despite being recognized by the research community, have not previously made their way into routine clinical practice. Results We have developed a clinically validated pipeline for highly specific and sensitive detection of structural variants basing on 30X PCR-free WGS. Using a combination of breakpoint analysis of split and discordant reads, and read depth analysis, the pipeline identifies structural variants down to single base pair resolution. False positives are minimized using calculations for loss of heterozygosity and bi-modal heterozygous variant allele frequencies to enhance heterozygous deletion and duplication detection respectively. Compound and potential compound combinations of structural variants and small sequence changes are automatically detected. To facilitate clinical interpretation, identified variants are annotated with phenotype information derived from HGMD Professional and population allele frequencies derived from public and Variantyx allele frequency databases. Single base pair resolution enables easy visual inspection of potentially causal variants using the IGV genome browser as well as easy biochemical validation via PCR. Analytical and clinical sensitivity and specificity of the pipeline has been validated using analysis of Genome in a Bottle reference genomes and known positive samples confirmed by orthogonal sequencing technologies. Conclusion Consistent read depth of PCR-free WGS enables reliable detection of structural variants of any size. Annotation both on gene and variant level allows clinicians to match reported patient phenotype with detected variants and confidently report causative finding in all clinical cases used for validation. Electronic supplementary material The online version of this article (10.1186/s12864-019-5866-z) contains supplementary material, which is available to authorized users.
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Affiliation(s)
| | | | | | | | - Limor Kalfon
- Institute of Human Genetics, Galilee Medical Center, Naharia, Israel
| | - Tzipora Falik-Zaccai
- Institute of Human Genetics, Galilee Medical Center, Naharia, Israel.,The Azrieli Faculty of Medicine, Bar Ilan, Safed, Israel
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9
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Platzer K, Sticht H, Edwards SL, Allen W, Angione KM, Bonati MT, Brasington C, Cho MT, Demmer LA, Falik-Zaccai T, Gamble CN, Hellenbroich Y, Iascone M, Kok F, Mahida S, Mandel H, Marquardt T, McWalter K, Panis B, Pepler A, Pinz H, Ramos L, Shinde DN, Smith-Hicks C, Stegmann APA, Stöbe P, Stumpel CTRM, Wilson C, Lemke JR, Di Donato N, Miller KG, Jamra R. De Novo Variants in MAPK8IP3 Cause Intellectual Disability with Variable Brain Anomalies. Am J Hum Genet 2019; 104:203-212. [PMID: 30612693 DOI: 10.1016/j.ajhg.2018.12.008] [Citation(s) in RCA: 27] [Impact Index Per Article: 5.4] [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: 11/02/2018] [Accepted: 12/11/2018] [Indexed: 01/28/2023] Open
Abstract
Using exome sequencing, we have identified de novo variants in MAPK8IP3 in 13 unrelated individuals presenting with an overlapping phenotype of mild to severe intellectual disability. The de novo variants comprise six missense variants, three of which are recurrent, and three truncating variants. Brain anomalies such as perisylvian polymicrogyria, cerebral or cerebellar atrophy, and hypoplasia of the corpus callosum were consistent among individuals harboring recurrent de novo missense variants. MAPK8IP3 has been shown to be involved in the retrograde axonal-transport machinery, but many of its specific functions are yet to be elucidated. Using the CRISPR-Cas9 system to target six conserved amino acid positions in Caenorhabditis elegans, we found that two of the six investigated human alterations led to a significantly elevated density of axonal lysosomes, and five variants were associated with adverse locomotion. Reverse-engineering normalized the observed adverse effects back to wild-type levels. Combining genetic, phenotypic, and functional findings, as well as the significant enrichment of de novo variants in MAPK8IP3 within our total cohort of 27,232 individuals who underwent exome sequencing, we implicate de novo variants in MAPK8IP3 as a cause of a neurodevelopmental disorder with intellectual disability and variable brain anomalies.
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Affiliation(s)
- Konrad Platzer
- Institute of Human Genetics, University of Leipzig Hospitals and Clinics, Leipzig 04103, Germany.
| | - Heinrich Sticht
- Institute of Biochemistry, Emil-Fischer Center, Friedrich-Alexander-Universität Erlangen-Nürnberg, Erlangen 91054, Germany
| | - Stacey L Edwards
- Genetic Models of Disease Laboratory, Oklahoma Medical Research Foundation, Oklahoma City, OK 73104, USA
| | - William Allen
- Department of Genetics, Fullerton Genetics Center, Asheville, NC 28803, USA
| | - Kaitlin M Angione
- Department of Pediatrics, Section of Clinical Genetics and Metabolism, University of Colorado School of Medicine, Aurora, CO 80045, USA
| | - Maria T Bonati
- Clinic of Medical Genetics, IRCCS Istituto Auxologico Italiano, Milan 20149, Italy
| | - Campbell Brasington
- Department of Pediatrics, Clinical Genetics, Levine Children's Hospital at Carolina Healthcare System, Charlotte, NC 28203, USA
| | | | - Laurie A Demmer
- Department of Pediatrics, Clinical Genetics, Levine Children's Hospital at Carolina Healthcare System, Charlotte, NC 28203, USA
| | - Tzipora Falik-Zaccai
- Institute of Human Genetics, Galilee Medical Center, Nahariya 22100, Israel; The Azrieli School of Medicine, Bar-Ilan University, Safed 1311502, Israel
| | - Candace N Gamble
- Department of Pediatrics, University of Texas Health Medical School, Houston, TX 77030, USA
| | - Yorck Hellenbroich
- Institute of Human Genetics, University of Lübeck, Lübeck 23562, Germany
| | - Maria Iascone
- Laboratorio di Genetica Medica, Azienda Socio Sanitaria Territoriale Papa Giovanni XXIII, Bergamo 24127, Italy
| | - Fernando Kok
- Mendelics Genomic Analysis, São Paulo 04013-000, Brazil
| | - Sonal Mahida
- Department of Neurology, Kennedy Krieger Institute, the Johns Hopkins University School of Medicine, Baltimore, MD 21205, USA
| | - Hanna Mandel
- Institute of Human Genetics, Galilee Medical Center, Nahariya 22100, Israel
| | - Thorsten Marquardt
- Department of Pediatrics, University Hospital Münster, Münster 48149, Germany
| | | | - Bianca Panis
- Department of Pediatrics, Zuyderland Medical Center, Heerlen and Sittard 6419, the Netherlands
| | - Alexander Pepler
- CeGaT GmbH and Praxis für Humangenetik Tübingen, Tübingen 72076, Germany
| | - Hailey Pinz
- Division of Medical Genetics, Department of Pediatrics, Saint Louis University School of Medicine, Saint Louis, MO 63104, USA
| | - Luiza Ramos
- Mendelics Genomic Analysis, São Paulo 04013-000, Brazil
| | - Deepali N Shinde
- Division of Clinical Genomics, Ambry Genetics, Aliso Viejo, CA 92656, USA
| | - Constance Smith-Hicks
- Department of Neurology, Kennedy Krieger Institute, the Johns Hopkins University School of Medicine, Baltimore, MD 21205, USA
| | - Alexander P A Stegmann
- Department of Clinical Genetics and School for Oncology and Developmental Biology, Maastricht University Medical Center, Maastricht 6229, the Netherlands
| | - Petra Stöbe
- CeGaT GmbH and Praxis für Humangenetik Tübingen, Tübingen 72076, Germany
| | - Constance T R M Stumpel
- Department of Clinical Genetics and School for Oncology and Developmental Biology, Maastricht University Medical Center, Maastricht 6229, the Netherlands
| | - Carolyn Wilson
- Department of Genetics, Fullerton Genetics Center, Asheville, NC 28803, USA
| | - Johannes R Lemke
- Institute of Human Genetics, University of Leipzig Hospitals and Clinics, Leipzig 04103, Germany
| | - Nataliya Di Donato
- Institute for Clinical Genetics, Carl Gustav Carus Faculty of Medicine, TU Dresden, Dresden 01307, Germany
| | - Kenneth G Miller
- Genetic Models of Disease Laboratory, Oklahoma Medical Research Foundation, Oklahoma City, OK 73104, USA
| | - Rami Jamra
- Institute of Human Genetics, University of Leipzig Hospitals and Clinics, Leipzig 04103, Germany
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Paz R, Falik-Zaccai T, Aharon-Peretz J, Kahn I. P2‐489: CHARACTERIZING COGNITIVE AND NEURAL ALTERATIONS AMONG HEALTHY PARTICIPANTS WITH A GENETIC PREDISPOSITION FOR ALZHEIMER'S DISEASE. Alzheimers Dement 2018. [DOI: 10.1016/j.jalz.2018.06.1182] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Rotem Paz
- Technion-Israel Institute of TechnologyHaifaIsrael
- Rambam Health Care CampusHaifaIsrael
| | | | - Judith Aharon-Peretz
- Cognitive Neurology InstituteRambam Health Care Campus, Haifa, IsraelHaifaIsrael
| | - Itamar Kahn
- Technion–Israel Institute of TechnologyHaifaIsrael
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11
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Abstract
INTRODUCTION Fetal echogenic bowel is a frequent sonographic finding, demonstrated in about 1% of pregnancies. The advised evaluation of fetal echogenic bowel includes maternal serology, genetic testing for cystic fibrosis, detailed sonographic anatomic survey, and invasive prenatal testing for fetal chromosomal aberrations. The objective of our study was to evaluate the risk for clinically significant chromosomal microarray analysis (CMA) findings in pregnancies with isolated echogenic bowel. METHODS Data from all CMA analyses performed due to isolated echogenic bowel reported to the Israeli Ministry of Health between January 2013 and September 2016 were retrospectively obtained. Risk estimation was performed comparing the rate of abnormal microarray findings to the control population, based on a systematic review of 9272 pregnancies and a large local cohort of 5541 fetuses with normal ultrasound, undergoing CMA testing due to maternal request. RESULTS Of 103 CMA analyses performed due to isolated echogenic bowel, two (1.94%) pathogenic findings were detected (47,XYY and 16p11.2 duplication). This risk was not significantly elevated compared to the control groups. In addition, three variants of unknown significance were demonstrated. CONCLUSIONS To our best knowledge, our study is the first report describing the rate of clinically significant copy number variants in pregnancies with isolated echogenic bowel. According to our results, it seems that pregnancies with isolated echogenic bowel do not have an increased risk for abnormal CMA compared to fetuses with no evidence of sonographic anomalies. Our findings suggest that the consideration to perform CMA analysis in such pregnancies should not differ from any pregnancy with normal ultrasound.
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Affiliation(s)
- Amihood Singer
- Community Genetics, Public Health Services, Ministry of Health, Jerusalem, Israel
| | - Idit Maya
- Recanati Genetics Institute, Beilinson Hospital, Rabin Medical Center, Petach Tikva, Israel
| | - Arie Koifman
- Genetics Institute, Soroka Medical Center, Beer Sheva, Israel
| | | | - Hagit N Baris
- The Genetics Institute, Rambam Health Care Campus, and the Technion, - Israel Institute of Technology, Haifa, Israel
| | - Tzipora Falik-Zaccai
- Institute of Human Genetics, Galilee Medical Center, Nahariya, The Galilee Faculty of Medicine, Bar Ilan, Israel
| | - Shay Ben Shachar
- Genetic Institute, Tel Aviv Sourasky Medical Center, affiliated to the Sackler Faculty of Medicine, Tel Aviv University, Tel Aviv, Israel
| | - Lena Sagi-Dain
- Genetics Institute, Carmel Medical Center, Haifa, Israel.
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12
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Sagi-Dain L, Maya I, Falik-Zaccai T, Feingold-Zadok M, Lev D, Yonath H, Kaliner E, Frumkin A, Ben Shachar S, Singer A. Isolated fetal horseshoe kidney does not seem to increase the risk for abnormal chromosomal microarray results. Eur J Obstet Gynecol Reprod Biol 2018; 222:80-83. [PMID: 29367169 DOI: 10.1016/j.ejogrb.2018.01.015] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [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: 09/23/2017] [Revised: 01/11/2018] [Accepted: 01/15/2018] [Indexed: 12/18/2022]
Abstract
OBJECTIVE To examine the risk for clinically significant chromosomal microarray analysis (CMA) among fetuses with apparently isolated horseshoe kidney. METHODS Data from all CMA analyses performed due to isolated horseshoe kidney reported to the Israeli Ministry of Health between January 2013 and September 2016 were retrospectively obtained from a computerized database. Risk estimation was performed comparing the rate of abnormal CMA findings to the general population, based on a systematic review encompassing 9272 pregnancies with normal ultrasound, and local data cohort of 5541 pregnancies undergoing CMA due to maternal request. RESULTS Of 82 pregnancies with isolated horseshoe kidney, one loss-of-copy-number variant compatible with 16p13.11 microdeletion syndrome was demonstrated (1.2%). In addition, two variants of unknown significance (VOUS) were detected (2.4%). The relative risk for pathogenic CMA findings among pregnancies with isolated single horseshoe kidney was not significantly different from the control population (1.03-1.39%). DISCUSSION To our best knowledge, our study is the first report describing the rate of clinically significant CMA findings in fetuses with isolated horseshoe kidney. The detection of one pathogenic CMA findings in our cohort implies that the value of CMA analysis in such pregnancies is similar to the general population.
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Affiliation(s)
- Lena Sagi-Dain
- Genetics Institute, Carmel Medical Center, Haifa, Israel.
| | - Idit Maya
- Recanati Genetics Institute, Beilinson Hospital, Rabin Medical Center, Petach Tikva, Israel
| | - Tzipora Falik-Zaccai
- Institute of Human Genetics, Galilee Medical Center, Nahariya, The Galilee Faculty of Medicine, Bar Ilan, Israel
| | | | - Dorit Lev
- The Rina Mor Institute of Medical Genetics, Wolfson Medical Center, Holon, Israel
| | - Hagit Yonath
- Genetics Institute, Sheba Medical Center, Tel Hashomer, 52621 Ramat Gan, Israel
| | - Ehud Kaliner
- Israel Ministry of Health, Public Health Services, Jerusalem, Israel
| | - Ayala Frumkin
- Department of Genetics and Metabolic Diseases, Hadassah, Hebrew University Medical Center, Jerusalem, Israel
| | | | - Amihood Singer
- Community Genetics, Public Health Services, Ministry of Health, Jerusalem, Israel
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13
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Kalfon L, Weissman I, Hershkovits M, Nasser Samra N, Edri N, Khayat M, Tanus M, Shihab S, Mandel H, Falik-Zaccai T. [OXALATE STONES ARE PREVALENT AMONG DRUZE AND MUSLIM ARABS IN THE GALILEE]. Harefuah 2017; 156:156-162. [PMID: 28551940] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
INTRODUCTION Primary Hyperoxaluria type I (PH1) is a rare autosomal recessive disease caused by lack or dysfunction of the liver peroxisomal enzyme alanine: glyoxylate aminotransferase, AGT. AIMS To conduct clinical and genetic characterization of Druze and Muslim Arab patients with PH1 in Northern Israel. METHODS In the last 20 years, 36 children and families were diagnosed and treated in the Nephrology-Genetic Clinic at the Galilee Medical Center. Clinical evaluation for nephrocalcinosis with/without renal stones, elevated excretion of oxalate and glycolate in urine, and genetic workup were performed. Treatment included hemodialysis, and/or peritoneal dialysis. Some patients were directed to preemptive liver transplantation or to combined liver and kidney transplantation. Genetic counseling and prenatal diagnosis were conducted. RESULTS Thirty-six patients, from newborns to adults in their 20's, were diagnosed with PH1. They represent 38.8% of patients in the pediatric-dialysis unit. The genetic variant in the AGXT gene causing their disease was identified. Nine prenatal diagnoses were performed, and a genetic screening program was implemented in four Druze villages in the Galilee and Golan Heights. CONCLUSIONS PH1 is a prevalent disease among Druze and Muslim Arabs in northern Israel. Genetic diagnosis is the gold standard and enables early diagnosis and treatment. Genotype-phenotype correlations are complex. Population screening programs provide an important tool for prevention. DISCUSSION The "genetic islands" of PH1 in northern Israel require a community-based medical approach for the prevention of the disease and the treatment of presymptomatic patients for better prognosis.
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Affiliation(s)
- Limor Kalfon
- Institute of Human Genetics, Galilee Medical Center, Nahariya, Israel
| | - Irit Weissman
- Pediatric Nephrology Department, Galilee Medical Center, Nahariya, Israel
| | | | - Nadra Nasser Samra
- Institute of Human Genetics, Galilee Medical Center, Nahariya, Israel
- Faculty of Medicine, Bar Ilan University, Safed, Israel
| | - Nurit Edri
- Institute of Human Genetics, Galilee Medical Center, Nahariya, Israel
| | - Morad Khayat
- Institute of Human Genetics, Galilee Medical Center, Nahariya, Israel
| | - Mary Tanus
- Israel Ministry of Health, Akko district, Israel
| | | | - Hanna Mandel
- Metabolic Unit, Rambam Health Care Campus, Haifa, Israel
| | - Tzipora Falik-Zaccai
- Institute of Human Genetics, Galilee Medical Center, Nahariya, Israel
- Faculty of Medicine, Bar Ilan University, Safed, Israel
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14
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Akria L, Chezar J, Zisman-Rozen S, Scheinman EJ, Zonis Z, Hoffmann Y, Falik-Zaccai T, Kalfon L, Weiss M, Braester A, Suriu C, Barhoum M, Kuperman A, Shaoul E. A Puzzling "Switch" in Blood Type Following Blood Transfusion. Ann Lab Med 2017; 37:293-295. [PMID: 28224781 PMCID: PMC5339107 DOI: 10.3343/alm.2017.37.3.293] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/01/2016] [Revised: 11/04/2016] [Accepted: 02/01/2017] [Indexed: 11/23/2022] Open
Affiliation(s)
- Luiza Akria
- Blood Bank and Molecular Hematology Laboratory, Galilee Medical Center, Nahariya, Israel.,Faculty of Medicine in the Galilee, Bar Ilan University, Safed, Israel.
| | - Judith Chezar
- Blood Bank and Molecular Hematology Laboratory, Galilee Medical Center, Nahariya, Israel
| | - Simona Zisman-Rozen
- Blood Bank and Molecular Hematology Laboratory, Galilee Medical Center, Nahariya, Israel
| | - Eyal J Scheinman
- Blood Bank and Molecular Hematology Laboratory, Galilee Medical Center, Nahariya, Israel
| | - Zeev Zonis
- Pediatric Intensive Care Unit, Galilee Medical Center, Nahariya, Israel.,Faculty of Medicine in the Galilee, Bar Ilan University, Safed, Israel
| | - Yoav Hoffmann
- Pediatric Intensive Care Unit, Galilee Medical Center, Nahariya, Israel.,Faculty of Medicine in the Galilee, Bar Ilan University, Safed, Israel
| | - Tzipora Falik-Zaccai
- Faculty of Medicine in the Galilee, Bar Ilan University, Safed, Israel.,Cytogenetic Laboratory, Galilee Medical Center, Nahariya, Israel
| | - Limor Kalfon
- Cytogenetic Laboratory, Galilee Medical Center, Nahariya, Israel
| | - Michael Weiss
- Faculty of Medicine in the Galilee, Bar Ilan University, Safed, Israel.,Department of Surgery, Galilee Medical Center, Nahariya, Israel
| | - Andrei Braester
- Faculty of Medicine in the Galilee, Bar Ilan University, Safed, Israel.,Department of Hematology, Galilee Medical Center, Nahariya, Israel
| | - Celia Suriu
- Faculty of Medicine in the Galilee, Bar Ilan University, Safed, Israel.,Department of Hematology, Galilee Medical Center, Nahariya, Israel
| | - Masad Barhoum
- Faculty of Medicine in the Galilee, Bar Ilan University, Safed, Israel.,Department of Hematology, Galilee Medical Center, Nahariya, Israel
| | - Amir Kuperman
- Faculty of Medicine in the Galilee, Bar Ilan University, Safed, Israel.,Department of Pediatrics, Galilee Medical Center, Nahariya, Israel
| | - Ety Shaoul
- Blood Bank and Molecular Hematology Laboratory, Galilee Medical Center, Nahariya, Israel.,Faculty of Medicine in the Galilee, Bar Ilan University, Safed, Israel
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15
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Steenweg ME, Jakobs C, Errami A, van Dooren SJM, Adeva Bartolomé MT, Aerssens P, Augoustides-Savvapoulou P, Baric I, Baumann M, Bonafé L, Chabrol B, Clarke JTR, Clayton P, Coker M, Cooper S, Falik-Zaccai T, Gorman M, Hahn A, Hasanoglu A, King MD, de Klerk HBC, Korman SH, Lee C, Meldgaard Lund A, Mejaski-Bosnjak V, Pascual-Castroviejo I, Raadhyaksha A, Rootwelt T, Roubertie A, Ruiz-Falco ML, Scalais E, Schimmel U, Seijo-Martinez M, Suri M, Sykut-Cegielska J, Trefz FK, Uziel G, Valayannopoulos V, Vianey-Saban C, Vlaho S, Vodopiutz J, Wajner M, Walter J, Walter-Derbort C, Yapici Z, Zafeiriou DI, Spreeuwenberg MD, Celli J, den Dunnen JT, van der Knaap MS, Salomons GS. An overview of L-2-hydroxyglutarate dehydrogenase gene (L2HGDH) variants: a genotype-phenotype study. Hum Mutat 2010; 31:380-90. [PMID: 20052767 DOI: 10.1002/humu.21197] [Citation(s) in RCA: 85] [Impact Index Per Article: 6.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Abstract
L-2-Hydroxyglutaric aciduria (L2HGA) is a rare, neurometabolic disorder with an autosomal recessive mode of inheritance. Affected individuals only have neurological manifestations, including psychomotor retardation, cerebellar ataxia, and more variably macrocephaly, or epilepsy. The diagnosis of L2HGA can be made based on magnetic resonance imaging (MRI), biochemical analysis, and mutational analysis of L2HGDH. About 200 patients with elevated concentrations of 2-hydroxyglutarate (2HG) in the urine were referred for chiral determination of 2HG and L2HGDH mutational analysis. All patients with increased L2HG (n=106; 83 families) were included. Clinical information on 61 patients was obtained via questionnaires. In 82 families the mutations were detected by direct sequence analysis and/or multiplex ligation dependent probe amplification (MLPA), including one case where MLPA was essential to detect the second allele. In another case RT-PCR followed by deep intronic sequencing was needed to detect the mutation. Thirty-five novel mutations as well as 35 reported mutations and 14 nondisease-related variants are reviewed and included in a novel Leiden Open source Variation Database (LOVD) for L2HGDH variants (http://www.LOVD.nl/L2HGDH). Every user can access the database and submit variants/patients. Furthermore, we report on the phenotype, including neurological manifestations and urinary levels of L2HG, and we evaluate the phenotype-genotype relationship.
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Affiliation(s)
- Marjan E Steenweg
- Department of Child Neurology and VU University Medical Center, De Boelelaan 1117, Amsterdam, The Netherlands
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16
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Falik-Zaccai T, Kfir N, Laskar M, Segel R, Khyat M, Slor H. [Clinical, biochemical and molecular characterization of rare genetic disorders, related to nucleotide excision repair (NER) system]. Harefuah 2006; 145:889-94, 942. [PMID: 17220027] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 05/13/2023]
Abstract
All living organisms are equipped with DNA repair systems that can cope with a wide variety of DNA lesions. Among these repair pathways, nucleotide excision repair (NER) is quite versatile, involved in the removal of a variety of bulky DNA lesions induced by ultraviolet light and chemical carcinogens and mutagens. The importance of NER for human health is illustrated mainly by the occurrence of rare life-threatening disorders such as Xeroderma Pigmentosum (XP), Cockayne Syndrome (CS) and Trichthiodystrophy (TTD). XP, CS and most TTD patients exhibit increased sensitivity to UV light and premature aging. XP is associated with a high incidence of skin tumors, CS is primarily a developmental disorder associated with failure to thrive, and psychomotor retardation. The authors report the clinical, biochemical and molecular aspects of the NER pathway in individuals suspected to have a DNA repair, NER type-related disease. These diseases are rare worldwide, but are frequent in Israel, probably due to the high rate of consanguinity among certain Arab, Druze and Jewish populations. Our laboratory is the only one in Israel, and one of very few labs world-wide that is performing DNA repair evaluation as a diagnostic test for DNA repair-deficient inherited diseases. Identification of the causative genes and proteins in suspected families will facilitate accurate diagnosis, genetic counseling, identification of couples at risk and prenatal diagnosis.
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17
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Falik-Zaccai T, Golan N, Cuckle H. [Prenatal diagnosis for chromosomal abnormality: time to change the Israeli policy]. Harefuah 2006; 145:916-22, 940. [PMID: 17220033] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 05/13/2023]
Abstract
Down syndrome is the most common serious chromosomal abnormality among live births. Safe, inexpensive, and accurate prenatal screening, with a high detection rate (DR) and low false positive rate (FPR) is needed for prevention. Second trimester screening, based on three maternal serum markers (free betaHCG, uE3, AFP) has a 59-75% DR with a 5% FPR. The addition of Inhibin-A to this panel (Quadruple test), increases DR to 70-85%. First trimester screening combining two serum markers (free betaHCG, PAPP-A), with ultrasound nuchal translucency (NT) has a 80-90% DR, allows reassurance or early diagnosis and pregnancy termination in a relatively simple and safe technique. Testing sequentially in both trimesters (NT, PAPP-A, then Quadruple markers), but withholding results until all markers are measured, allows a 92-94% DR with a low FPR, although the clinical and human advantages of early testing are lost. Three alternative approaches are presented in this review, which achieve a high DR and low FPR without this disadvantage. Based on recently published data, we propose a change in the current policy practiced in Israel whereby women above 35 are referred for invasive prenatal diagnosis paid by the government. Instead, awareness of modern screening methods should be enhanced and invasive diagnosis only offered to women whose risk based on screening exceeds an agreed cutoff. This would achieve better and safer prevention acceptable to a wide spectrum of ethnicities, religions and cultures in Israeli society, at a reasonable cost to the public health system in Israel.
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18
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Waisman D, Kessel I, Ish-Shalom N, Maroun L, Riskin-Mashiah S, Falik-Zaccai T, Weintraub Z, Albersheim S, Rotschild A. The anuric preterm newborn infant with a normal renal ultrasound: a diagnostic and ethical challenge. Prenat Diagn 2006; 26:350-3. [PMID: 16511901 DOI: 10.1002/pd.1417] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Abstract
Diagnosis and treatment of an anuric premature infant with severe respiratory compromise and a normal renal ultrasound (US), is a difficult task that requires a multidisciplinary approach. A 29-week gestation premature male infant, born after 5 weeks of worsening oligohydramnios, was ventilated for respiratory distress and remained anuric. Intensive clinical investigations and pediatric nephrology consultation that predicted very poor prognosis were followed by progressive renal failure, electrolyte imbalance, respiratory failure, ventricular arrhythmia, and finally cardiac arrest and death on day 5. In view of the predicted poor outcome, and after discussion with the parents, a decision was made not to start peritoneal dialysis (PD), and to offer only palliative therapy, with comfort care alone. Pre and postnatal diagnosis lead, in this case, to an ethical challenge that focuses on the question of futility.
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Affiliation(s)
- Dan Waisman
- Department of Neonatology, Carmel Medical Center, The Bruce Rappaport Faculty of Medicine Technion-Israel Institute of Technology, Haifa 34362, Israel.
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19
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Horowitz M, Pasmanik-Chor M, Borochowitz Z, Falik-Zaccai T, Heldmann K, Carmi R, Parvari R, Beit-Or H, Goldman B, Peleg L, Levy-Lahad E, Renbaum P, Legum S, Shomrat R, Yeger H, Benbenisti D, Navon R, Dror V, Shohat M, Magal N, Navot N, Eyal N. Prevalence of glucocerebrosidase mutations in the Israeli Ashkenazi Jewish population. Hum Mutat 2000; 12:240-4. [PMID: 9744474 DOI: 10.1002/(sici)1098-1004(1998)12:4<240::aid-humu4>3.0.co;2-j] [Citation(s) in RCA: 72] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Abstract
Gaucher disease is the most prevalent inherited disease among Ashkenazi Jews. It is very heterogeneous due to a large number of mutations within the glucocerebrosidase gene, whose impaired activity is the cause for this disease. Aiming at determining Gaucher carrier frequency among the Ashkenazi Jewish population in Israel, 1,208 individuals were molecularly diagnosed for six mutations known to occur among Ashkenazi Jewish Gaucher patients, using the newly developed Pronto Gaucher kit. The following mutations were tested: N370S, 84GG, IVS2+1, D409H, L444P, and V394L. Molecular testing of these mutations also allows identification of the recTL allele. The results indicated that Gaucher carrier frequency is 1:17 within the tested population. The prevalence of N370S carriers is 1:17.5. This implies that approximately 1:1225 Ashkenazi Jews will be homozygous for the N370S mutation. Actually, in our study of 1,208 individuals one was found to be homozygous for the N370S mutation. The actual number of known Ashkenazi Jewish Gaucher patients with this genotype is much lower than that expected according to the frequency of the N370S mutation, suggesting a low penetrance of this mutation. Results of loading experiments in cells homozygous for the N370S mutation, as well as cells homozygous for the L444P and the D409H mutations, exemplified this phenomenon.
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Affiliation(s)
- M Horowitz
- Department of Cell Research and Immunology, Tel-Aviv University, Ramat Aviv, Israel.
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Rugg EL, Baty D, Shemanko CS, Magee G, Polak S, Bergman R, Kadar T, Boxer M, Falik-Zaccai T, Borochowitz Z, Lane EB. DNA based prenatal testing for the skin blistering disorder epidermolysis bullosa simplex. Prenat Diagn 2000; 20:371-7. [PMID: 10820403 DOI: 10.1002/(sici)1097-0223(200005)20:5<371::aid-pd818>3.0.co;2-5] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Abstract
Epidermolysis bullosa simplex (EBS) is a skin fragility disorder in which mild physical trauma leads to blistering. The phenotype of the disorder is variable, from relatively mild affecting only the hands and/or feet, to very severe with widespread blistering. For the severest forms of EBS there is a demand for prenatal diagnosis which until now has involved a fetal skin biopsy in the second trimester. The identification of mutations in the genes encoding keratins K5 and K14 as the cause of EBS opens up the possibility of much earlier diagnosis of the disease. We report here four cases in which prenatal testing was performed. In three of the cases the genetic lesions were unknown at the start of the pregnancy, requiring the identification of the causative mutation prior to testing fetal DNA. In two of the four cases novel mutations were identified in K14 and in the two remaining families, a previously identified type of mutation was found. Fetal DNA, obtained by chorionic villus sampling or amniocentesis, was analysed for the identified mutations. Three of the DNA samples were found to be normal; a mutant K14 allele was identified in the fourth case and the pregnancy was terminated. These results demonstrate the feasibility of DNA-based prenatal testing for EBS in families where causative mutations can be found.
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Affiliation(s)
- E L Rugg
- CRC Cell Structure Research Group, Cancer Research Campaign Laboratories, Department of Anatomy & Physiology, University of Dundee, Dundee, U.K.
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