keyword
MENU ▼
Read by QxMD icon Read
search

Chromosome pairing

keyword
https://www.readbyqxmd.com/read/28711872/cell-scientist-to-watch-kevin-corbett
#1
(no author information available yet)
Kevin Corbett graduated in biology and biochemistry from the University of Virginia. He then went to the University of California, Berkeley, to work on the structure and function of DNA topoisomerases in bacteria and archaea for his PhD with James Berger. In 2005, he moved to the laboratory of Stephen Harrison at Harvard Medical School for his postdoctoral work on kinetochore structure and function, particularly the yeast monopolin complex, which promotes proper chromosome segregation in the first meiotic division...
July 15, 2017: Journal of Cell Science
https://www.readbyqxmd.com/read/28710064/time-course-analysis-of-early-meiotic-prophase-events-informs-mechanisms-of-homolog-pairing-and-synapsis-in-caenorhabditis-elegans
#2
Susanna Mlynarczyk-Evans, Anne M Villeneuve
Segregation of homologous chromosomes during meiosis depends on their ability to reorganize within the nucleus, discriminate among potential partners, and stabilize pairwise associations through assembly of the synaptonemal complex (SC). Here we report a high-resolution time-course analysis of these key early events during Caenorhabditis elegans meiosis. Labeled nucleotides are incorporated specifically into the X chromosomes during the last two hours of S phase, a property we exploit to identify a highly synchronous cohort of nuclei...
July 14, 2017: Genetics
https://www.readbyqxmd.com/read/28702949/genetic-analysis-of-optic-nerve-head-coloboma-in-the-nova-scotia-duck-tolling-retriever-identifies-discordance-with-the-nhej1-intronic-deletion-collie-eye-anomaly-mutation
#3
Emily A Brown, Sara M Thomasy, Christopher J Murphy, Danika L Bannasch
Collie eye anomaly (CEA) encompasses a spectrum of different ophthalmic phenotypes from clinically inconsequential choroidal hypoplasia to blindness from coloboma of the optic nerve head (ONH). A previous study found a 7.8-kb deletion in intron 4 of the NHEJ1 gene to be associated with CEA. A genetic test based on this association is recommended for many breeds, including the Nova Scotia Duck Tolling Retriever (NSDTR). Collection of ONH coloboma-affected NSDTR showed lack of concordance of the NHEJ1 intronic deletion with ONH coloboma...
July 12, 2017: Veterinary Ophthalmology
https://www.readbyqxmd.com/read/28699914/expression-patterns-for-nicotinic-acetylcholine-receptor-subunit-genes-in-smoking-related-lung-cancers
#4
Anna Bordas, José Luis Cedillo, Francisco Arnalich, Isabel Esteban-Rodriguez, Laura Guerra-Pastrián, Javier de Castro, Carolina Martín-Sánchez, Gema Atienza, Carmen Fernández-Capitan, Juan José Rios, Carmen Montiel
Cigarette smoking is associated with increased risk for all histologic types of lung cancer, but why the strength of this association is stronger for squamous cell carcinoma than adenocarcinoma of the lung (SQC-L, ADC-L) is not fully understood. Because nicotine and tobacco-specific nitrosamines contribute to carcinogenesis by activating nicotinic acetylcholine receptors (nAChRs) on lung tumors and epithelial cells, we investigated whether differential expression of nAChR subtypes in these tumors could explain their different association with smoking...
July 4, 2017: Oncotarget
https://www.readbyqxmd.com/read/28699856/analysis-of-the-origin-of-inherited-chromosomally-integrated-human-herpesvirus-6-in-the-japanese-population
#5
Yoshiki Kawamura, Tamae Ohye, Hiroki Miura, Masaru Ihira, Yuri Kato, Hiroki Kurahashi, Tetsushi Yoshikawa
Integration of the complete human herpesvirus 6 (HHV-6) genome into the telomere of a chromosome has been reported in some individuals (inherited chromosomally integrated HHV-6; iciHHV-6). Since the proportion of iciHHV-6-positive individuals with integration in chromosome 22 is high in Japan, we hypothesized a founder effect. In this study, we sought to elucidate the reason for the high proportion of viral integrations into chromosome 22. We analyzed six cases of iciHHV-6A and two cases of iciHHV-6B, including one iciHHV-6A case with a matched sample from a father and one iciHHV-6B case with a matched sample from a mother...
July 12, 2017: Journal of General Virology
https://www.readbyqxmd.com/read/28696257/transient-and-dynamic-dna-supercoiling-potently-stimulates-the-leu-500-promoter-in-escherichia-coli
#6
Xiaoduo Zhi, Samantha Dages, Kelley Dages, Yingting Liu, Zi-Chun Hua, John Makemson, Fenfei Leng
The inactive prokaryotic leu-500 promoter (Pleu-500) contains a single A-to-G point mutation in the -10 region of the leucine operon promoter, which causes leucine auxotrophy. This promoter can be activated by (-) DNA supercoiling in Escherichia coli topA strains. However, whether this activation arises from global, permanent or transient, dynamic supercoiling is still not fully understood. In this article, using a newly established in vivo system carrying a pair of divergently coupled promoters, i.e., an IPTG-inducible promoter and Pleu-500 that control the expression of lacZ and luc (the firefly luciferase gene) respectively, we demonstrate that transient, dynamic (-) DNA supercoiling provided by divergent transcription in both wild-type and topA strains can potently activate Pleu-500...
July 10, 2017: Journal of Biological Chemistry
https://www.readbyqxmd.com/read/28694245/fundamental-cell-cycle-kinases-collaborate-to-ensure-timely-destruction-of-the-synaptonemal-complex-during-meiosis
#7
Bilge Argunhan, Wing-Kit Leung, Negar Afshar, Yaroslav Terentyev, Vijayalakshmi V Subramanian, Yasuto Murayama, Andreas Hochwagen, Hiroshi Iwasaki, Tomomi Tsubouchi, Hideo Tsubouchi
The synaptonemal complex (SC) is a proteinaceous macromolecular assembly that forms during meiotic prophase I and mediates adhesion of paired homologous chromosomes along their entire lengths. Although prompt disassembly of the SC during exit from prophase I is a landmark event of meiosis, the underlying mechanism regulating SC destruction has remained elusive. Here, we show that DDK (Dbf4-dependent Cdc7 kinase) is central to SC destruction. Upon exit from prophase I, Dbf4, the regulatory subunit of DDK, directly associates with and is phosphorylated by the Polo-like kinase Cdc5...
July 10, 2017: EMBO Journal
https://www.readbyqxmd.com/read/28692793/rare-x-chromosome-abnormalities-in-systemic-lupus-erythematosus-and-sj%C3%A3-gren-s-syndrome
#8
Rohan Sharma, Valerie M Harris, Joshua Cavett, Biji T Kurien, Ke Liu, Kristi A Koelsch, Anum Fayaaz, Kaustubh S Chaudhari, Lida Radfar, David Lewis, Donald U Stone, C Erick Kaufman, Shibo Li, Barbara Segal, Daniel J Wallace, Michael H Weisman, Swamy Venuturupalli, Jennifer A Kelly, Bernardo Pons-Estel, Roland Jonsson, Xianglan Lu, Jacques-Eric Gottenberg, Juan-Manuel Anaya, Deborah S Cunninghame-Graham, Andrew J W Huang, Michael T Brennan, Pamela Hughes, Ilias Alevizos, Corinne Miceli-Richard, Edward C Keystone, Vivian P Bykerk, Gideon Hirschfield, Gang Xie, Gunnel Nordmark, Sara Magnusson Bucher, Per Eriksson, Roald Omdal, Nelson L Rhodus, Maureen Rischmueller, Michael Rohrer, Marie Wahren-Herlenius, Torsten Witte, Marta Alarcon-Riquelme, Xavier Mariette, Christopher J Lessard, John B Harley, Wan-Fai Ng, Astrid Rasmussen, Kathy L Sivils, R Hal Scofield
BACKGROUND: Sjögren's syndrome and systemic lupus erythematosus (SLE) are related by clinical and serological manifestations as well as genetic risks. Both diseases are more commonly found in women compared to men at a ratio of about 10 to 1. Common X chromosome aneuploidies, 47,XXY and 47,XXX, are enriched among men and women, respectively, in either disease suggesting a dose effect on the X chromosome. METHODS: We examined cohorts of Sjögren's syndrome or SLE patients with intensity plots of X chromosome single nucleotide polymorphism (SNP) alleles along with karyotype of selected subjects...
July 10, 2017: Arthritis & Rheumatology
https://www.readbyqxmd.com/read/28692038/par-terra-directs-homologous-sex-chromosome-pairing
#9
Hsueh-Ping Chu, John E Froberg, Barry Kesner, Hyun Jung Oh, Fei Ji, Ruslan Sadreyev, Stefan F Pinter, Jeannie T Lee
In mammals, homologous chromosomes rarely pair outside meiosis. One exception is the X chromosome, which transiently pairs during X-chromosome inactivation (XCI). How two chromosomes find each other in 3D space is not known. Here, we reveal a required interaction between the X-inactivation center (Xic) and the telomere in mouse embryonic stem (ES) cells. The subtelomeric, pseudoautosomal regions (PARs) of the two sex chromosomes (X and Y) also undergo pairing in both female and male cells. PARs transcribe a class of telomeric RNA, dubbed PAR-TERRA, which accounts for a vast majority of all TERRA transcripts...
July 10, 2017: Nature Structural & Molecular Biology
https://www.readbyqxmd.com/read/28690484/genomic-investigation-of-balanced-chromosomal-rearrangements-in-patients-with-abnormal-phenotypes
#10
Milena Simioni, François Artiguenave, Vincent Meyer, Ilária C Sgardioli, Nilma L Viguetti-Campos, Isabella Lopes Monlleó, Andréa T Maciel-Guerra, Carlos E Steiner, Vera L Gil-da-Silva-Lopes
Balanced chromosomal rearrangements (BCR) are associated with abnormal phenotypes in approximately 6% of balanced translocations and 9.4% of balanced inversions. Abnormal phenotypes can be caused by disruption of genes at the breakpoints, deletions, or positional effects. Conventional cytogenetic techniques have a limited resolution and do not enable a thorough genetic investigation. Molecular techniques applied to BCR carriers can contribute to the characterization of this type of chromosomal rearrangement and to the phenotype-genotype correlation...
June 2017: Molecular Syndromology
https://www.readbyqxmd.com/read/28688040/identification-of-all-homoeologous-chromosomes-of-newly-synthetic-allotetraploid-cucumis-%C3%A3-hytivus-and-its-wild-parent-reveals-stable-subgenome-structure
#11
Yunzhu Wang, Qinzheng Zhao, Xiaodong Qin, Shuqiong Yang, Ziang Li, Ji Li, Qunfeng Lou, Jinfeng Chen
Allopolyploidy and homoeologous recombination are two important processes in reshaping genomes and generating evolutionary novelties. Newly formed allopolyploids usually display chromosomal perturbations as a result of pairing errors at meiosis. To understand mechanisms of stabilization of allopolyploid species derived from distant chromosome bases, we investigated mitotic stability of a synthetic Cucumis allotetraploid species in relation to meiosis chromosome behavior. The Cucumis × hytivus is an allotetraploid synthesized from interspecific hybridization between cucumber (Cucumis sativus, 2n = 14) and its wild relative Cucumis hystrix (2n = 24) followed by spontaneous chromosome doubling...
July 7, 2017: Chromosoma
https://www.readbyqxmd.com/read/28681819/genome-sequence-of-an-invasive-strain-of-streptococcus-gordonii
#12
Thangam Menon, V Naveen Kumar
We report the genome sequence of IE35, a strain of Streptococcus gordonii isolated from the blood of a patient with prosthetic valve endocarditis. Whole-genome sequencing of S. gordonii IE35 strain by the combination of Illumina HiSeq2000 paired-end, Ion Torrent single-end sequencing and gap closing by Illumina NextSeq yielded a single, circular chromosome of 2,190,105 bp. It had 2106 predicted coding sequences, of which 2014 genes encoded proteins involved in various cellular processes and 66 genes coded for RNA...
April 2017: Indian Journal of Medical Microbiology
https://www.readbyqxmd.com/read/28681469/differential-expression-of-homologous-recombination-dna-repair-genes-in-the-early-and-advanced-stages-of-myelodysplastic-syndrome
#13
Jan Valka, Jitka Vesela, Hana Votavova, Michaela Dostalova-Merkerova, Zuzana Horakova, Vit Campr, Jana Brezinova, Zuzana Zemanova, Anna Jonasova, Jaroslav Cermak, Monika Belickova
BACKGROUND: The high incidence of mutations and cytogenetic abnormalities in patients with myelodysplastic syndrome (MDS) suggests that defects in DNA repair mechanisms. We monitored DNA repair pathways in MDS and their alterations during disease progression. METHODS: Expression profiling of DNA repair genes was performed on CD34+ cells and paired samples were used for monitoring of RAD51 and XRCC2 gene expression during disease progression. Immunohistochemical staining for RAD51 was done on histology samples...
July 5, 2017: European Journal of Haematology
https://www.readbyqxmd.com/read/28670425/vitrification-of-human-germinal-vesicle-oocytes-before-or-after-in-vitro-maturation
#14
Evangelia Kasapi, Byron Asimakopoulos, Katerina Chatzimeletiou, Stamatios Petousis, Yannis Panagiotidis, Nikos Prapas, Nikos Nikolettos
BACKGROUND: The use of immature oocytes derived from stimulated cycles could be of great importance, particularly for urgent fertility preservation cases. The current study aimed to determine whether in vitro maturation (IVM) was more successful before or after vitrification of these oocytes. MATERIALS AND METHODS: This prospective study was performed in a private in vitro fertilization (IVF) center. We collected 318 germinal vesicle (GV) oocytes from 104 stimulated oocyte donation cycles...
July 2017: International Journal of Fertility & Sterility
https://www.readbyqxmd.com/read/28668977/organization-and-evolution-of-four-differentially-amplified-tandem-repeats-in-the-cucumis-hystrix-genome
#15
Shuqiong Yang, Xiaodong Qin, Chunyan Cheng, Ziang Li, Qunfeng Lou, Ji Li, Jinfeng Chen
Three subtelomeric satellites and one interstitial 5S rDNA were characterized in Cucumis hystrix, and the pericentromeric signals of two C. hystrix subtelomeric satellites along C. sativus chromosomes supported the hypothesis of chromosome fusion in Cucumis. Tandem repeats are chromosome structural fractions consisting of highly repetitive sequences organized in large tandem arrays in most eukaryotes. Differentiation of tandem repeats directly affects the chromosome structure, which contributes to species formation and evolution...
July 1, 2017: Planta
https://www.readbyqxmd.com/read/28668862/clinicopathological-characteristics-of-metaplastic-papillary-tumor-of-the-fallopian-tube
#16
M I Jang, Ji-Youn Sung, Ji-Ye Kim, Hyun-Soo Kim
Metaplastic papillary tumor (MPT) of the fallopian tube is a very uncommon lesion, displaying papillary growth of bland-appearing cells with abundant, eosinophilic cytoplasm and mucinous metaplasia. It is difficult for pathologists to determine whether to categorize this lesion as a metaplastic proliferative lesion or a true neoplasm. We recently experienced a case of tubal MPT and initiated a comprehensive review of previously published cases with thorough analysis of clinicopathological characteristics. MPT is typically related to pregnancy, but we describe the first case of pregnancy-unrelated, incidentally detected tubal MPT in a 51-year-old woman who underwent surgery for endometrial cancer...
July 2017: Anticancer Research
https://www.readbyqxmd.com/read/28667116/a-third-type-of-resistance-of-codling-moth-against-cydia-pomonella-granulovirus-cpgv-shows-a-mixture-of-a-z-linked-and-autosomal-inheritance-pattern
#17
A J Sauer, S Schulze-Bopp, E Fritsch, K Undorf-Spahn, J A Jehle
Different isolates of Cydia pomonella granulovirus (CpGV) are worldwide used to control codling moth larvae (Cydia pomonella; CM) in pome fruit production. Two types of dominantly inherited field resistances of CM to CpGV have been recently identified: Z-chromosomal type I resistance and autosomal type II resistance. In the present study, a CpGV-resistant CM field population (termed SA-GO) from North-East Germany was investigated. SA-GO individuals showed cross-resistance to CpGV isolates of genome group A (CpGV-M) and genome group E (CpGV-S), whereas genome group B (CpGV-E2) was still infective...
June 30, 2017: Applied and Environmental Microbiology
https://www.readbyqxmd.com/read/28667016/an-rna-recognition-motif-containing-protein-functions-in-meiotic-silencing-by-unpaired-dna
#18
Dilini A Samarajeewa, Pennapa Manitchotpisit, Miranda Henderson, Hua Xiao, David G Rehard, Kevin A Edwards, Patrick K T Shiu, Thomas M Hammond
Meiotic silencing by unpaired DNA (MSUD) is a biological process that searches pairs of homologous chromosomes (homologs) for segments of DNA that are unpaired. Genes found within unpaired segments are silenced for the duration of meiosis. In this report, we describe the identification and characterization of Neurospora crassa sad-7, a gene that encodes a protein with an RNA recognition motif. Orthologs of sad-7 are found in a wide range of ascomycete fungi. In N. crassa, sad-7 is required for a fully-efficient MSUD response to unpaired genes...
June 30, 2017: G3: Genes—Genomes—Genetics
https://www.readbyqxmd.com/read/28666956/coordination-of-cellular-differentiation-polarity-mitosis-and-meiosis-new-findings-from-early-vertebrate-oogenesis
#19
REVIEW
Yaniv M Elkouby, Mary C Mullins
A mechanistic dissection of early oocyte differentiation in vertebrates is key to advancing our knowledge of germline development, reproductive biology, the regulation of meiosis, and all of their associated disorders. Recent advances in the field include breakthroughs in the identification of germline stem cells in Medaka, in the cellular architecture of the germline cyst in mice, in a mechanistic dissection of chromosomal pairing and bouquet formation in meiosis in mice, in tracing oocyte symmetry breaking to the chromosomal bouquet of meiosis in zebrafish, and in the biology of the Balbiani body, a universal oocyte granule...
June 28, 2017: Developmental Biology
https://www.readbyqxmd.com/read/28663070/poetry-in-motion-increased-chromosomal-mobility-after-dna-damage
#20
REVIEW
Michael J Smith, Rodney Rothstein
Double-strand breaks (DSBs) are among the most lethal DNA lesions, and a variety of pathways have evolved to manage their repair in a timely fashion. One such pathway is homologous recombination (HR), in which information from an undamaged donor site is used as a template for repair. Although many of the biochemical steps of HR are known, the physical movements of chromosomes that must underlie the pairing of homologous sequence during mitotic DSB repair have remained mysterious. Recently, several groups have begun to use a variety of genetic and cell biological tools to study this important question...
June 9, 2017: DNA Repair
keyword
keyword
103022
1
2
Fetch more papers »
Fetching more papers... Fetching...
Read by QxMD. Sign in or create an account to discover new knowledge that matter to you.
Remove bar
Read by QxMD icon Read
×

Search Tips

Use Boolean operators: AND/OR

diabetic AND foot
diabetes OR diabetic

Exclude a word using the 'minus' sign

Virchow -triad

Use Parentheses

water AND (cup OR glass)

Add an asterisk (*) at end of a word to include word stems

Neuro* will search for Neurology, Neuroscientist, Neurological, and so on

Use quotes to search for an exact phrase

"primary prevention of cancer"
(heart or cardiac or cardio*) AND arrest -"American Heart Association"