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https://www.readbyqxmd.com/read/29350171/the-dna-copy-number-landscape-of-a-collision-tumor
#1
Hugh Kearney, Jane B Cryan, Seamus Looby, Francesca M Brett, Michael A Farrell, Patrick G Buckley
Intracranial collision tumors are composed of two histologically distinct but merging components, and are rare. Their genetic profile has rarely been described. Comparative genome hybridization of a combined meningioma and oligodendroglioma demonstrated deletion of chromosome 22q and of 19q in both tumors. Somatic deletion of chromosome 22q and 19q is associated with development of an intracranial collision tumor.
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January 19, 2018: Clinical Neuropathology
https://www.readbyqxmd.com/read/29345728/analytical-performance-of-the-thyroseq-v3-genomic-classifier-for-cancer-diagnosis-in-thyroid-nodules
#2
Marina N Nikiforova, Stephanie Mercurio, Abigail I Wald, Michelle Barbi de Moura, Keith Callenberg, Lucas Santana-Santos, William E Gooding, Linwah Yip, Robert L Ferris, Yuri E Nikiforov
BACKGROUND: Molecular tests have clinical utility for thyroid nodules with indeterminate fine-needle aspiration (FNA) cytology, although their performance requires further improvement. This study evaluated the analytical performance of the newly created ThyroSeq v3 test. METHODS: ThyroSeq v3 is a DNA- and RNA-based next-generation sequencing assay that analyzes 112 genes for a variety of genetic alterations, including point mutations, insertions/deletions, gene fusions, copy number alterations, and abnormal gene expression, and it uses a genomic classifier (GC) to separate malignant lesions from benign lesions...
January 18, 2018: Cancer
https://www.readbyqxmd.com/read/29338128/clinical-experience-of-laboratory-follow-up-with-non-invasive-prenatal-testing-using-cell-free-dna-and-positive-microdeletion-results-in-349-cases
#3
S Schwartz, M Kohan, R Pasion, P R Papenhausen, L D Platt
OBJECTIVE: Screening via non-invasive prenatal testing (NIPT) involving the analysis of cell-free DNA (cfDNA) from plasma has become readily available to screen for chromosomal and DNA aberrations through maternal blood. This report reviews a laboratory's experience with follow-up of positive NIPT screens for microdeletions. METHODS: Patients that were screen positive by NIPT for a microdeletion involving 1p, 4p, 5p, 15q, or 22q, who underwent diagnostic studies by either CVS or amniocentesis were evaluated...
January 16, 2018: Prenatal Diagnosis
https://www.readbyqxmd.com/read/29322978/chromosomal-aberrations-in-chordoid-meningioma-an-analysis
#4
Harsha Sugur, Arun H Shastry, Nishant Sadashiva, Dwarakanath Srinivas, Vani Santosh, Sampath Somanna
INTRODUCTION: Chordoid meningiomas (CMs) are a rare subgroup of tumors, accounting for approximately 0.5% of all meningiomas. These tumors correspond to World Health Organization (WHO) Grade II lesions and behave aggressively, with an increased likelihood of recurrence. There are only two studies that have described the genetic alterations in CMs. While a majority of meningiomas are known to have deletion at many chromosomal loci such as 22q, 18p, 14q, and 1p, which are found to be associated with initiation, progression, and malignancy of these tumors, these have not yet been studied in CMs...
January 2018: Neurology India
https://www.readbyqxmd.com/read/29306563/yield-rate-of-chromosomal-microarray-analysis-in-fetuses-with-congenital-heart-defects
#5
Sifa Turan, Mehmet Resit Asoglu, Rinat Gabbay Benziv, Lauren Doyle, Christopher Harman, Ozhan M Turan
OBJECTIVE: The purpose of this study was to calculate the yield rates of CMA in fetuses diagnosed with various CHDs in a tertiary center. STUDY DESIGN: This cohort study collected prenatal genetic test results of 145 fetuses diagnosed with CHD. All 145 cases underwent Conventional karyotype (CK), followed by CMA in cases of negative CK result. "Detection rate" of genetic abnormalities was calculated as the percentage of cases with genetic abnormalities identified...
December 12, 2017: European Journal of Obstetrics, Gynecology, and Reproductive Biology
https://www.readbyqxmd.com/read/29230670/double-somatic-smarcb1-and-nf2-mutations-in-sporadic-spinal-schwannoma
#6
Irene Paganini, Gabriele Lorenzo Capone, Jeremie Vitte, Roberta Sestini, Anna Laura Putignano, Marco Giovannini, Laura Papi
In sporadic schwannomas, inactivation of both copies of the NF2 tumor suppressor gene on 22q is common. Constitutional mutations of SMARCB1 are responsible of schwannomatosis, an inherited tumor predisposition syndrome, characterized by the development of multiple schwannomas. We analysed the frequency of copy number changes on chromosome 22 and the mutation of NF2 and SMARCB1 in 26 sporadic schwannomas. We found two spinal schwannomas with an identical somatic missense mutation in SMARCB1 exon 9: p.(Arg377His)...
December 11, 2017: Journal of Neuro-oncology
https://www.readbyqxmd.com/read/29204428/case-of-gastric-neuroendocrine-carcinoma-showing-an-interesting-tumorigenic-pathway
#7
Noriyuki Uesugi, Ryo Sugimoto, Makoto Eizuka, Yasuko Fujita, Mitsumasa Osakabe, Keisuke Koeda, Takashi Kosaka, Shunichi Yanai, Kazuyuki Ishida, Akira Sasaki, Takayuki Matsumoto, Tamotsu Sugai
Here, we report a case of gastric neuroendocrine carcinoma showing an interesting tumorigenic pathway. A 57-year-old Japanese woman presented with epigastric tenderness, and distal gastrectomy was performed. In the surgical specimen, histologically, the tumor tissue was composed of three subtypes of tumor components showing different histological architecture and cellular atypia, diagnosed as neuroendocrine tumor (NET) G2, NET G3, and neuroendocrine carcinoma (NEC) components. Immunohistochemically, the Ki-67-positive rates of NET G2, NET G3, and NEC components were 6...
November 16, 2017: World Journal of Clinical Cases
https://www.readbyqxmd.com/read/29194955/incomplete-penetrance-variable-expressivity-or-dosage-insensitivity-in-four-families-with-directly-transmitted-unbalanced-chromosome-abnormalities
#8
Mark S Bateman, Morag N Collinson, David J Bunyan, Amanda L Collins, Philippa Duncan, Rachel Firth, Victoria Harrison, Tessa Homfray, Shuwen Huang, Beth Kirk, Katherine L Lachlan, Viv K Maloney, John C K Barber
The direct transmission of microscopically visible unbalanced chromosome abnormalities (UBCAs) is rare and usually has phenotypic consequences. Here we report four families in which a normal phenotype was initially found in one or more family members. Each UBCA was interpreted with regard to overlapping examples and factors previously associated with transmitted imbalances including incidental ascertainment, low gene density, benign copy number variation (CNV) content, and gene relatedness. A 4.56 Mb deletion of 8p23...
December 1, 2017: American Journal of Medical Genetics. Part A
https://www.readbyqxmd.com/read/29124790/neuropathology-of-genetic-synucleinopathies-with-parkinsonism-review-of-the-literature
#9
REVIEW
Susanne A Schneider, Roy N Alcalay
Clinical-pathological studies remain the gold-standard for the diagnosis of Parkinson's disease (PD). However, mounting data from genetic PD autopsies challenge the diagnosis of PD based on Lewy body pathology. Most of the confirmed genetic risks for PD show heterogenous neuropathology, even within kindreds, which may or may not include Lewy body pathology. We review the literature of genetic PD autopsies from cases with molecularly confirmed PD or parkinsonism and summarize main findings on SNCA (n = 25), Parkin (n = 20, 17 bi-allelic and 3 heterozygotes), PINK1 (n = 5, 1 bi-allelic and 4 heterozygotes), DJ-1 (n = 1), LRRK2 (n = 55), GBA (n = 10 Gaucher disease patients with parkinsonism), DNAJC13, GCH1, ATP13A2, PLA2G6 (n = 8 patients, 2 with PD), MPAN (n = 2), FBXO7, RAB39B, and ATXN2 (SCA2), as well as on 22q deletion syndrome (n = 3)...
November 2017: Movement Disorders: Official Journal of the Movement Disorder Society
https://www.readbyqxmd.com/read/28919758/a-case-of-schizophrenia-comorbid-for-tetralogy-of-fallot-treated-with-clozapine-further-considerations-on-a-role-for-22q-11-2-in-the-proneness-for-seizures
#10
Hiroko Kashiwagi, Satoru Ikezawa, Tomiki Sumiyoshi, Atsuko Kadono, Kazuhiko Segawa, Kazuyoshi Takeda, Mayu Omori, Hisako Taguchi, Naotsugu Hirabayashi
We present a case of schizophrenia comorbid for tetralogy of Fallot, without chromosome 22q.11.2 deletion or duplication, treated successfully with a combination of clozapine and antiepileptic drugs. Although clozapine by itself initially triggered convulsive seizures, we continued it with co-administration of valproate and topiramate. This combined treatment did not affect cardiac function of the patient, who experienced a favorable clinical course in terms of symptomatology and functional outcomes. To our knowledge, we provide the first report on a patient with tetralogy of Fallot, in whom 22q...
2017: Neuropsychiatric Disease and Treatment
https://www.readbyqxmd.com/read/28910456/identification-of-alk-rearrangements-in-malignant-peritoneal-mesothelioma
#11
Yin P Hung, Fei Dong, Jaclyn C Watkins, Valentina Nardi, Raphael Bueno, Paola Dal Cin, John J Godleski, Christopher P Crum, Lucian R Chirieac
Importance: Malignant peritoneal mesothelioma is a rare, aggressive tumor arising from the peritoneal lining, induced by asbestos, therapeutic radiation, or germline mutations. Nevertheless, the molecular features remain largely unknown. Objective: To investigate anaplastic lymphoma kinase (ALK) rearrangements in a large series of peritoneal mesothelioma and characterize the mutational landscape of these tumors. Design, Setting, and Participants: We studied 88 consecutive patients (39 men, 49 women; median age 61, range 17-84 years) with peritoneal mesotheliomas diagnosed at a single institution between 2005 and 2015...
September 14, 2017: JAMA Oncology
https://www.readbyqxmd.com/read/28901666/clinicopathological-and-molecular-characteristics-of-pediatric-meningiomas
#12
Sudha Battu, Anupam Kumar, Pankaj Pathak, Suvendu Purkait, Linchi Dhawan, Mehar C Sharma, Ashish Suri, Manmohan Singh, Chitra Sarkar, Vaishali Suri
Molecular and clinical characteristics of pediatric meningiomas are poorly defined. Therefore, we analyzed clinical, morphological and molecular profiles of pediatric meningiomas. Forty pediatric meningiomas from January 2002 to June 2015 were studied. 1p36, 14q32 and 22q-deletion were assessed by fluorescent in situ hybridization and mutations of most relevant exons of AKT, SMO, KLF4, TRAF and pTERT using sequencing. Expression of GAB1, stathmin, progesterone receptor (PR), p53 along with MIB-1 LI was examined using immunohistochemistry...
September 13, 2017: Neuropathology: Official Journal of the Japanese Society of Neuropathology
https://www.readbyqxmd.com/read/28775249/therapeutic-radiation-for-childhood-cancer-drives-structural-aberrations-of-nf2-in-meningiomas
#13
Sameer Agnihotri, Suganth Suppiah, Peter D Tonge, Shahrzad Jalali, Arnavaz Danesh, Jeffery P Bruce, Yasin Mamatjan, George Klironomos, Lior Gonen, Karolyn Au, Sheila Mansouri, Sharin Karimi, Felix Sahm, Andreas von Deimling, Michael D Taylor, Normand J Laperriere, Trevor J Pugh, Kenneth D Aldape, Gelareh Zadeh
Cranial radiotherapy improves survival of the most common childhood cancers, including brain tumors and leukemia. Unfortunately, long-term survivors are faced with consequences of secondary neoplasia, including radiation-induced meningiomas (RIMs). We characterized 31 RIMs with exome/NF2 intronic sequencing, RNA sequencing and methylation profiling, and found NF2 gene rearrangements in 12/31 of RIMs, an observation previously unreported in sporadic meningioma (SM). Additionally, known recurrent mutations characteristic of SM, including AKT1, KLF4, TRAF7 and SMO, were not observed in RIMs...
August 4, 2017: Nature Communications
https://www.readbyqxmd.com/read/28737257/unilateral-vestibular-schwannoma-and-meningiomas-in-a-patient-with-pik3ca-related-segmental-overgrowth-co-occurrence-of-mosaicism-for-two-rare-disorders
#14
John R Mills, Ann M Moyer, Benjamin R Kipp, Andrzej B Poplawski, Ludwine M Messiaen, Dusica Babovic-Vuksanovic
A 28-year-old female with PIK3CA-related segmental overgrowth presented with headaches. She also had a unilateral vestibular schwannoma (VS), as well as three small (<2 cm) meningiomas, which according to the Manchester consensus diagnostic criteria for neurofibromatosis 2 (NF2) is sufficient for a clinical diagnosis. Analysis of blood revealed a mosaic PIK3CA c.2740G>A (p.Gly914Arg) mutation, confirming the diagnosis of PIK3CA-related overgrowth, but no mutations in NF2 were detected. Although VS has not previously been reported in PIK3CA-related segmental overgrowth, meningiomas have, raising the question of whether this patient's VS and meningiomas represent coincidental NF2 or phenotypic extension of her overgrowth syndrome...
July 24, 2017: Clinical Genetics
https://www.readbyqxmd.com/read/28643921/whole-exome-sequencing-identified-a-variant-in-eftud2-gene-in-establishing-a-genetic-diagnosis
#15
S Rengasamy Venugopalan, E G Farrow, M Lypka
OBJECTIVES: Craniofacial anomalies are complex and have an overlapping phenotype. Mandibulofacial Dysostosis and Oculo-Auriculo-Vertebral Spectrum are conditions that share common craniofacial phenotype and present a challenge in arriving at a diagnosis. In this report, we present a case of female proband who was given a differential diagnosis of Treacher Collins syndrome or Hemifacial Microsomia without certainty. Prior genetic testing reported negative for 22q deletion and FGFR screenings...
June 2017: Orthodontics & Craniofacial Research
https://www.readbyqxmd.com/read/28632504/what-is-new-in-gastrointestinal-stromal-tumor
#16
Inga-Marie Schaefer, Adrián Mariño-Enríquez, Jonathan A Fletcher
The classification "gastrointestinal stromal tumor" (GIST) became commonplace in the 1990s and since that time various advances have characterized the GIST lineage of origin, tyrosine kinase mutations, and mechanisms of response and resistance to targeted therapies. In addition to tyrosine kinase mutations and their constitutive activation of downstream signaling pathways, GISTs acquire a sequence of chromosomal aberrations. These include deletions of chromosomes 14q, 22q, 1p, and 15q, which harbor putative tumor suppressor genes required for stepwise progression from microscopic, preclinical forms of GIST (microGIST) to clinically relevant tumors with malignant potential...
September 2017: Advances in Anatomic Pathology
https://www.readbyqxmd.com/read/28621320/genomic-analysis-of-follicular-dendritic-cell-sarcoma-by-molecular-inversion-probe-array-reveals-tumor-suppressor-driven-biology
#17
Erica F Andersen, Christian N Paxton, Dennis P O'Malley, Abner Louissaint, Jason L Hornick, Gabriel K Griffin, Yuri Fedoriw, Young S Kim, Lawrence M Weiss, Sherrie L Perkins, Sarah T South
Follicular dendritic cell sarcoma is a rare malignant neoplasm of dendritic cell origin that is currently poorly characterized by genetic studies. To investigate whether recurrent genomic alterations may underlie the biology of follicular dendritic cell sarcoma and to identify potential contributory regions and genes, molecular inversion probe array analysis was performed on 14 independent formalin-fixed, paraffin-embedded samples. Abnormal genomic profiles were observed in 11 out of 14 (79%) cases. The majority showed extensive genomic complexity that was predominantly represented by hemizygous losses affecting multiple chromosomes...
September 2017: Modern Pathology: An Official Journal of the United States and Canadian Academy of Pathology, Inc
https://www.readbyqxmd.com/read/28620005/cancer-and-central-nervous-system-tumor-surveillance-in-pediatric-neurofibromatosis-2-and-related-disorders
#18
REVIEW
D Gareth R Evans, Hector Salvador, Vivian Y Chang, Ayelet Erez, Stephan D Voss, Harriet Druker, Hamish S Scott, Uri Tabori
The neurofibromatoses consist of at least three autosomal-dominant inherited disorders: neurofibromatosis type 1 (NF1), neurofibromatosis type 2 (NF2), and schwannomatosis. For over 80 years, these conditions were inextricably tied together under generalized neurofibromatosis. In 1987, the localization of NF1 to chromosome 17q and NF2 (bilateral vestibular schwannoma) to 22q led to a consensus conference at Bethesda, Maryland. The two main neurofibromatoses, NF1 and NF2, were formally separated. More recently, the SMARCB1 and LZTR1 genes on 22q have been confirmed as causing a subset of schwannomatosis...
June 15, 2017: Clinical Cancer Research: An Official Journal of the American Association for Cancer Research
https://www.readbyqxmd.com/read/28536274/mapping-22q11-2-gene-dosage-effects-on-brain-morphometry
#19
Amy Lin, Christopher R K Ching, Ariana Vajdi, Daqiang Sun, Rachel K Jonas, Maria Jalbrzikowski, Leila Kushan-Wells, Laura Pacheco Hansen, Emma Krikorian, Boris Gutman, Deepika Dokoru, Gerhard Helleman, Paul M Thompson, Carrie E Bearden
Reciprocal chromosomal rearrangements at the 22q11.2 locus are associated with elevated risk of neurodevelopmental disorders. The 22q11.2 deletion confers the highest known genetic risk for schizophrenia, but a duplication in the same region is strongly associated with autism and is less common in schizophrenia cases than in the general population. Here we conducted the first study of 22q11.2 gene dosage effects on brain structure in a sample of 143 human subjects: 66 with 22q11.2 deletions (22q-del; 32 males), 21 with 22q11...
June 28, 2017: Journal of Neuroscience: the Official Journal of the Society for Neuroscience
https://www.readbyqxmd.com/read/28533481/massively-parallel-sequencing-and-genome-wide-copy-number-analysis-revealed-a-clonal-relationship-in-benign-metastasizing-leiomyoma
#20
Ren-Chin Wu, An-Shine Chao, Li-Yu Lee, Gigin Lin, Shu-Jen Chen, Yen-Jung Lu, Huei-Jean Huang, Chi-Feng Yen, Chien Min Han, Yun-Shien Lee, Tzu-Hao Wang, Angel Chao
Benign metastasizing leiomyoma (BML) is a rare disease entity typically presenting as multiple extrauterine leiomyomas associated with a uterine leiomyoma. It has been hypothesized that the extrauterine leiomyomata represent distant metastasis of the uterine leiomyoma. To date, the only molecular evidence supporting this hypothesis was derived from clonality analyses based on X-chromosome inactivation assays. Here, we sought to address this issue by examining paired specimens of synchronous pulmonary and uterine leiomyomata from three patients using targeted massively parallel sequencing and molecular inversion probe array analysis for detecting somatic mutations and copy number aberrations...
July 18, 2017: Oncotarget
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