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https://www.readbyqxmd.com/read/28238446/ctns-molecular-genetics-profile-in-a-persian-nephropathic-cystinosis-population
#1
Farideh Ghazi, Rozita Hosseini, Mansoureh Akouchekian, Shahram Teimourian, Zohreh Ataei Kachoei, Hassan Otukesh, William A Gahl, Babak Behnam
PURPOSE: In this report, we document the CTNS gene mutations of 28 Iranian patients with nephropathic cystinosis age 1-17 years. All presented initially with severe failure to thrive, polyuria, and polydipsia. METHODS: Cystinosis was primarily diagnosed by a pediatric nephrologist and then referred to the Iran University of Medical Sciences genetics clinic for consultation and molecular analysis, which involved polymerase chain reaction (PCR) amplification to determine the presence or absence of the 57-kb founder deletion in CTNS, followed by direct sequencing of the coding exons of CTNS...
February 23, 2017: Nefrología: Publicación Oficial de la Sociedad Española Nefrologia
https://www.readbyqxmd.com/read/28236508/phenotypical-features-of-a-new-dominant-gdap1-pathogenic-variant-p-r226del-in-axonal-charcot-marie-tooth-disease
#2
Tania García-Sobrino, Patricia Blanco-Arias, Francesc Palau, Carmen Espinós, Laura Ramirez, Anna Estela, Beatriz San Millán, Manuel Arias, María-Jesús Sobrido, Julio Pardo
There are few reports on axonal CMT due to dominant GDAP1 mutations. We describe two unrelated Spanish families with a dominant axonal CMT. A novel in frame GAA deletion in exon 5 of the GDAP1 gene (c.677_679del; p.R226del) was identified in both families. Disease onset varied from early childhood to adulthood. Affected family members complained of distal lower limb weakness, cramps and foot deformities with variable CMTNS score in both families. Several individuals were asymptomatic or had paraesthesia only, however neurological examination and nerve conduction studies demonstrated neuropathic signs...
January 17, 2017: Neuromuscular Disorders: NMD
https://www.readbyqxmd.com/read/28235832/one-thousand-somatic-snvs-per-skin-fibroblast-cell-set-baseline-of-mosaic-mutational-load-with-patterns-that-suggest-proliferative-origin
#3
Alexej Abyzov, Livia Tomasini, Bo Zhou, Nikolaos Vasmatzis, Gianfilippo Coppola, Mariangela Amenduni, Reenal Pattni, Michael Wilson, Mark Gerstein, Sherman Weissman, Alexander E Urban, Flora M Vaccarino
Few studies have been conducted to understand post-zygotic accumulation of mutations in cells of the healthy human body. We reprogrammed 32 skin fibroblast cells from families of donors into human induced pluripotent stem cell (hiPSC) lines. The clonal nature of hiPSC lines allows a high-resolution analysis of the genomes of the founder fibroblast cells without being confounded by the artifacts of single cell whole genome amplification. We estimate that on average a fibroblast cell in children has 1,035 mostly benign mosaic SNVs...
February 24, 2017: Genome Research
https://www.readbyqxmd.com/read/28220263/characterization-and-outcome-of-41-patients-with-beta-ketothiolase-deficiency-10%C3%A2-years-experience-of-a-medical-center-in-northern-vietnam
#4
Khanh Ngoc Nguyen, Elsayed Abdelkreem, Roberto Colombo, Yuki Hasegawa, Ngoc Thi Bich Can, Thao Phuong Bui, Hai Thanh Le, Mai Thi Chi Tran, Hoan Thi Nguyen, Hung Thanh Trinh, Yuka Aoyama, Hideo Sasai, Seiji Yamaguchi, Toshiyuki Fukao, Dung Chi Vu
Beta-ketothiolase (T2) deficiency is an inherited disease of isoleucine and ketone body metabolism caused by mutations in the ACAT1 gene. Between 2005 and 2016, a total of 41 patients with T2 deficiency were identified at a medical center in northern Vietnam, with an estimated incidence of one in 190,000 newborns. Most patients manifested ketoacidotic episodes of varying severity between 6 and 18 months of age. Remarkably, 28% of patients showed high blood glucose levels (up to 23.3 mmol/L). Ketoacidotic episodes recurred in 43% of patients...
February 20, 2017: Journal of Inherited Metabolic Disease
https://www.readbyqxmd.com/read/28213897/laryngo-onycho-cutaneous-like-syndrome-due-to-mutated-plectin
#5
Christine Prodinger, Alfred Klausegger, Anja Diem, Johann W Bauer, Martin Laimer
Laryngo-onycho-cutaneous syndrome (LOC) is a rare autosomal recessive genodermatosis that has been mainly described in the offspring of consanguineous families with origin in the Punjabi region of Pakistan and India [1]. Founder mutations affecting the LAMA3A gene on chromosome 18q11.2 have been implicated to underlie this syndrome [1,2]. Based on its molecular and clinical features, LOC was recently classified as a subtype of junctional Epidermolysis bullosa (JEB) [1]. This article is protected by copyright...
February 18, 2017: Journal of the European Academy of Dermatology and Venereology: JEADV
https://www.readbyqxmd.com/read/28202063/next-generation-sequencing-in-familial-breast-cancer-patients-from-lebanon
#6
Nadine Jalkh, Eliane Chouery, Zahraa Haidar, Christina Khater, David Atallah, Hamad Ali, Makia J Marafie, Mohamed R Al-Mulla, Fahd Al-Mulla, Andre Megarbane
BACKGROUND: Familial breast cancer (BC) represents 5 to 10% of all BC cases. Mutations in two high susceptibility BRCA1 and BRCA2 genes explain 16-40% of familial BC, while other high, moderate and low susceptibility genes explain up to 20% more of BC families. The Lebanese reported prevalence of BRCA1 and BRCA2 deleterious mutations (5.6% and 12.5%) were lower than those reported in the literature. METHODS: In the presented study, 45 Lebanese patients with a reported family history of BC were tested using Whole Exome Sequencing (WES) technique followed by Sanger sequencing validation...
February 15, 2017: BMC Medical Genomics
https://www.readbyqxmd.com/read/28197878/two-homozygous-mutations-in-the-exon-5-of-bckdhb-gene-that-may-cause-the-classic-form-of-maple-syrup-urine-disease
#7
Ling Su, Zhikun Lu, Fatao Li, Yongxian Shao, Huiying Sheng, Yanna Cai, Li Liu
Maple syrup urine disease (MSUD) is a rare autosomal recessive genetic disorder caused by defects in the catabolism of the branched-chain amino acids (BCAAs). Classic form of MSUD (CMSUD) is caused by mutations in BCKDHA, BCKDHB, DBT genes mostly. In this study, we analyzed the clinical and genetic characteristics of two patients with CMSUD. Two homozygous mutations, c.517G > T (p.Asp173Tyr) and c.503G > A (p.Arg168His), both in the exon 5 of BCKDHB were detected respectively. The novel mutation p...
February 15, 2017: Metabolic Brain Disease
https://www.readbyqxmd.com/read/28197208/molecular-mutations-and-their-cooccurrences-in-cytogenetically-normal-acute-myeloid-leukemia
#8
REVIEW
Mengning Wang, Chuanwei Yang, Le Zhang, Dale G Schaar
Adult acute myeloid leukemia (AML) clinically is a disparate disease that requires intensive treatments ranging from chemotherapy alone to allogeneic hematopoietic cell transplantation (allo-HCT). Historically, cytogenetic analysis has been a useful prognostic tool to classify patients into favorable, intermediate, and unfavorable prognostic risk groups. However, the intermediate-risk group, consisting predominantly of cytogenetically normal AML (CN-AML), itself exhibits diverse clinical outcomes and requires further characterization to allow for more optimal treatment decision-making...
2017: Stem Cells International
https://www.readbyqxmd.com/read/28195201/crispr-cas9-mediated-genome-editing-in-wild-derived-mice-generation-of-tamed-wild-derived-strains-by-mutation-of-the-a-nonagouti-gene
#9
Michiko Hirose, Ayumi Hasegawa, Keiji Mochida, Shogo Matoba, Yuki Hatanaka, Kimiko Inoue, Tatsuhiko Goto, Hideki Kaneda, Ikuko Yamada, Tamio Furuse, Kuniya Abe, Yoshihisa Uenoyama, Hiroko Tsukamura, Shigeharu Wakana, Arata Honda, Atsuo Ogura
Wild-derived mice have contributed to experimental mouse genetics by virtue of their genetic diversity, which may help increase the chance of identifying novel modifier genes responsible for specific phenotypes and diseases. However, gene targeting using wild-derived mice has been unsuccessful because of the unavailability of stable embryonic stem cells. Here, we report that CRISPR/Cas9-mediated gene targeting can be applied to the Japanese wild-derived MSM/Ms strain (Mus musculus molossinus). We targeted the nonagouti (a) gene encoding the agouti protein that is localized in hair and the brain...
February 14, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28193856/contribution-of-epigenetic-mechanisms-to-variation-in-cancer-risk-among-tissues
#10
Michael Klutstein, Joshua Moss, Tommy Kaplan, Howard Cedar
Recently, it was suggested that tissue variation in cancer risk originates from differences in the number of stem-cell divisions underlying each tissue, leading to different mutation loads. We show that this variation is also correlated with the degree of aberrant CpG island DNA methylation in normal cells. Methylation accumulates during aging in a subset of molecules, suggesting that the epigenetic landscape within a founder-cell population may contribute to tumor formation.
February 13, 2017: Proceedings of the National Academy of Sciences of the United States of America
https://www.readbyqxmd.com/read/28186352/analysis-of-clinical-symptoms-and-abcc6-mutations-in-76-japanese-patients-with-pseudoxanthoma-elasticum
#11
Akira Iwanaga, Yumi Okubo, Mariko Yozaki, Yuta Koike, Yutaka Kuwatsuka, Saori Tomimura, Yosuke Yamamoto, Hiroshi Tamura, Satoshi Ikeda, Koji Maemura, Eiko Tsuiki, Takashi Kitaoka, Yuichiro Endo, Hiroyuki Mishima, Koh-Ichiro Yoshiura, Tomoo Ogi, Hideaki Tanizaki, Mari Wataya-Kaneda, Tomoyasu Hattori, Atsushi Utani
Pseudoxanthoma elasticum (PXE) is a hereditary disease, causing calcification and degeneration of elastic fibers, which affects the skin, eye, cardiovascular systems and gastrointestinal tract. PXE is caused by mutations in the ABCC6 gene. Neither detailed nor large-scale analyses have been accomplished in Japanese patients with PXE. We, therefore, investigated clinical symptoms and ABCC6 gene mutations in 76 Japanese patients. Japanese PXE patients (n = 76) had a significantly lower incidence of vascular lesions than 505 PXE patients in the Leiden Open Variation Database (LOVD) (38...
February 10, 2017: Journal of Dermatology
https://www.readbyqxmd.com/read/28179633/band-like-calcification-with-simplified-gyration-and-polymicrogyria-report-of-10-new-families-and-identification-of-five-novel-ocln-mutations
#12
Mohamed S Abdel-Hamid, Ghada M H Abdel-Salam, Mahmoud Y Issa, Bayoumi A Emam, Maha S Zaki
Band-like calcification with simplified gyration and polymicrogyria (BLC-PMG) is an extremely rare autosomal recessive disorder with distinctive clinical and neuroimaging findings. To date, only 17 patients from 9 unrelated families with BLC-PMG have been reported worldwide. Herein, we describe a series of 13 new patients derived from 10 unrelated Egyptian families. Patients presented at early life with the classic phenotype including severe microcephaly, failure to acquire developmental skills, growth failure and the distinguished calcification patterns involving the cortex, thalami, basal ganglia and pons...
February 9, 2017: Journal of Human Genetics
https://www.readbyqxmd.com/read/28178700/genetic-profiling-of-cancers-of-the-digestive-system-biological-insights-and-clinical-implications
#13
Albrecht Stenzinger, Wilko Weichert
Massive parallel sequencing technologies (next-generation sequencing) have enabled us to draw a comprehensive landscape of the genomic aberrations underlying common cancers of the digestive system, and they have thus revolutionized our understanding of the genomic makeup and biology of these tumors. Apart from the commonly mutated founder genes, e.g., KRAS and TP53, we now have detailed information on additional and less frequent genomic events for every major digestive system cancer. However, many challenging issues remain when it comes to translating these findings into clinical applications...
February 9, 2017: Pathobiology: Journal of Immunopathology, Molecular and Cellular Biology
https://www.readbyqxmd.com/read/28176296/brca1-and-brca2-mutations-in-ovarian-cancer-patients-from-china-ethnic-related-mutations-in-brca1-associated-with-an-increased-risk-of-ovarian-cancer
#14
Tingyan Shi, Pan Wang, Caixia Xie, Sheng Yin, Di Shi, Congchong Wei, Wenbin Tang, Rong Jiang, Xi Cheng, Qingyi Wei, Qing Wang, Rongyu Zang
BRCA1/2 are cancer predisposition genes involved in hereditary breast and ovarian cancer (HBOC). Mutation carriers display an increased sensitivity to inhibitors of poly (ADP-ribose) polymerase (PARP). Despite a number of small-size hospital-based studies being previously reported, there is not yet, to our knowledge, precise data of BRCA1/2 mutations among Chinese ovarian cancer patients. We performed a multicenter cohort study including 916 unselected consecutive epithelial ovarian cancer (EOC) patients from eastern China, to screen for BRCA1/2 mutations using the next-generation sequencing approach...
February 8, 2017: International Journal of Cancer. Journal International du Cancer
https://www.readbyqxmd.com/read/28166811/pathogenic-variant-burden-in-the-exac-database-an-empirical-approach-to-evaluating-population-data-for-clinical-variant-interpretation
#15
Yuya Kobayashi, Shan Yang, Keith Nykamp, John Garcia, Stephen E Lincoln, Scott E Topper
BACKGROUND: The frequency of a variant in the general population is a key criterion used in the clinical interpretation of sequence variants. With certain exceptions, such as founder mutations, the rarity of a variant is a prerequisite for pathogenicity. However, defining the threshold at which a variant should be considered "too common" is challenging and therefore diagnostic laboratories have typically set conservative allele frequency thresholds. METHODS: Recent publications of large population sequencing data, such as the Exome Aggregation Consortium (ExAC) database, provide an opportunity to characterize with accuracy and precision the frequency distributions of very rare disease-causing alleles...
February 6, 2017: Genome Medicine
https://www.readbyqxmd.com/read/28161869/high-resolution-melting-analysis-is-very-useful-to-identify-breast-cancer-type-1-susceptibility-protein-brca1-c-4964_4982del19-rs80359876-founder-calabrian-pathogenic-variant-on-peripheral-blood-and-buccal-swab-dna
#16
Angelo Minucci, Maria De Bonis, Elisa De Paolis, Leonarda Gentile, Concetta Santonocito, Paola Concolino, Flavio Mignone, Ettore Capoluongo
INTRODUCTION: Detection of pathogenic variants in hereditary breast and ovarian cancer-related breast cancer type 1 and type 2 susceptibility proteins (BRCA1/2) genes is an effective strategy in cancer prevention and treatment. Some ethnic and geographical regions show different BRCA1/2 mutation spectrum and prevalence. In Italy, elucidation of founder effect in BRCA1/2 genes can have an impact on the management of hereditary cancer families on a healthcare system level, making genetic testing more affordable and cost effective in certain regions...
February 4, 2017: Molecular Diagnosis & Therapy
https://www.readbyqxmd.com/read/28159737/stem-and-progenitor-cell-alterations-in-myelodysplastic-syndromes
#17
Aditi Shastri, Britta Will, Ulrich Steidl, Amit Verma
Recent studies have demonstrated that myelodysplastic syndromes (MDS) arise from a small population of disease initiating hematopoietic stem cells (HSCs) that persist and expand through conventional therapies and are major contributors to disease progression and relapse. MDS stem and progenitor cells are characterized by key founder and driver mutations and are enriched for cytogenetic alterations. Quantitative alterations in stem and progenitor numbers are also seen in a stage specific manner in human MDS samples as well as in murine models of the disease...
February 3, 2017: Blood
https://www.readbyqxmd.com/read/28158899/clinical-phenotype-of-musladin-lueke-syndrome-in-2-beagles
#18
R A Packer, M A Logan, L T Guo, S S Apte, H Bader, D P O'Brien, G Johnson, G D Shelton
Musladin-Lueke syndrome (MLS), previously termed Chinese Beagle syndrome, is an autosomal-recessive connective tissue disorder characterized by extensive fibrosis of the skin and joints that was first identified in Beagles in the 1970s. Recent research identified a founder mutation (c.660C>T; p.R221C) in the ADAMTSL2 gene in Beagles with MLS. Here, we report the detailed clinical phenotype and laboratory findings in 2 Beagles affected with MLS. We discuss these findings in relation to the human disorder geleophysic dysplasia (GD), which also arises from recessive ADAMTSL2 mutations, and recent findings in Adamtsl2-deficient mice...
February 3, 2017: Journal of Veterinary Internal Medicine
https://www.readbyqxmd.com/read/28152414/coexisting-and-cooperating-mutations-in-npm1-mutated-acute-myeloid-leukemia
#19
Jay L Patel, Jonathan A Schumacher, Kimberly Frizzell, Shelly Sorrells, Wei Shen, Adam Clayton, Rakhi Jattani, Todd W Kelley
NPM1 insertion mutations represent a common recurrent genetic abnormality in acute myeloid leukemia (AML) patients. The frequency of these mutations varies from approximately 30% overall up to 50% in patients with a normal karyotype. Several recent studies have exploited advances in massively parallel sequencing technology to shed light on the complex genomic landscape of AML. We hypothesize that variant allele fraction (VAF) data derived from massively parallel sequencing studies may provide further insights into the clonal architecture and pathogenesis of NPM1-driven leukemogenesis...
January 23, 2017: Leukemia Research
https://www.readbyqxmd.com/read/28137737/evidence-for-the-founder-effect-of-ret533-as-the-common-greek-and-brazilian-ancestor-spreading-multiple-endocrine-neoplasia-2a
#20
Lucas Leite Cunha, Susan Chow Lindsey, Maria Inez França, Leda Sarika, Alexandra Papathoma, Ilda S Kunii, Janete Maria Cerutti, Magnus R Dias-da-Silva, Maria Alevizaki, Rui M B Maciel
OBJECTIVES: About one quarter of patients with medullary thyroid cancer (MTC) have inherited disease due to mutations in the RET gene. A rare mutation in exon 8 (G533C) of RET, previously described in a large Brazilian family with MEN2A, appeared to be clustering also in Greece while it was rarely reported in other ethnic groups. The aim of this study was to identify a possible common ancestry between these carriers. PATIENTS AND METHODS: Twelve RET G533C mutation carriers, four randomly selected from the Brazilian cohort and eight from apparently unrelated Greek families, were studied for a possible common ancestral origin...
January 30, 2017: European Journal of Endocrinology
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