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1.
Mol Cell ; 72(5): 823-835.e5, 2018 12 06.
Article in English | MEDLINE | ID: mdl-30415951

ABSTRACT

High-risk human papilloma viruses (HPVs) cause cervical, anal, and oropharyngeal cancers, unlike the low-risk HPVs, which cause benign lesions. E6 oncoproteins from the high-risk strains are essential for cell proliferation and transformation in HPV-induced cancers. We report that a cellular deubiquitinase, USP46, is selectively recruited by the E6 of high-risk, but not low-risk, HPV to deubiqutinate and stabilize Cdt2/DTL. Stabilization of Cdt2, a component of the CRL4Cdt2 E3 ubiquitin ligase, limits the level of Set8, an epigenetic writer, and promotes cell proliferation. USP46 is essential for the proliferation of HPV-transformed cells, but not of cells without HPV. Cdt2 is elevated in human cervical cancers and knockdown of USP46 inhibits HPV-transformed tumor growth in xenografts. Recruitment of a cellular deubiquitinase to stabilize key cellular proteins is an important activity of oncogenic E6, and the importance of E6-USP46-Cdt2-Set8 pathway in HPV-induced cancers makes USP46 a target for the therapy of such cancers.


Subject(s)
Endopeptidases/genetics , Human papillomavirus 16/genetics , Human papillomavirus 18/genetics , Nuclear Proteins/genetics , Papillomavirus Infections/genetics , Uterine Cervical Neoplasms/genetics , Animals , Cell Cycle , Cell Line, Tumor , DNA-Binding Proteins/genetics , DNA-Binding Proteins/metabolism , Endopeptidases/metabolism , Female , Gene Expression Regulation , HeLa Cells , Histone-Lysine N-Methyltransferase/genetics , Histone-Lysine N-Methyltransferase/metabolism , Host-Pathogen Interactions/genetics , Human papillomavirus 16/metabolism , Human papillomavirus 16/pathogenicity , Human papillomavirus 18/metabolism , Human papillomavirus 18/pathogenicity , Humans , Injections, Intralesional , Mice , Nuclear Proteins/metabolism , Oncogene Proteins, Viral/genetics , Oncogene Proteins, Viral/metabolism , Papillomavirus Infections/enzymology , Papillomavirus Infections/pathology , Papillomavirus Infections/virology , RNA, Small Interfering/genetics , RNA, Small Interfering/metabolism , Recombinant Fusion Proteins/genetics , Recombinant Fusion Proteins/metabolism , Repressor Proteins/genetics , Repressor Proteins/metabolism , Signal Transduction , Ubiquitin-Protein Ligases/genetics , Ubiquitin-Protein Ligases/metabolism , Uterine Cervical Neoplasms/enzymology , Uterine Cervical Neoplasms/pathology , Uterine Cervical Neoplasms/virology , Xenograft Model Antitumor Assays
2.
Int Microbiol ; 26(2): 257-267, 2023 May.
Article in English | MEDLINE | ID: mdl-36378397

ABSTRACT

Indian lotus (Nelumbo nucifera) is one of the dominant aquatic plants cultivated in Dal Lake, situated at 1586 m above mean sea level (MSL) in the northeast of Srinagar, Kashmir. Despite their economic and ecological role, the microbial communities associated with the lotus plant are still unexplored. In this study, we investigated the prokaryotic communities on surfaces of different lotus microhabitats (roots, rhizome, leaves, flowers, and fruits), lake water, and sediments using 16S rRNA gene amplicon sequencing. Overall, prokaryotic diversity decreased significantly on the surface of lotus microhabitats in comparison to the lake water and sediments. Among the microhabitats of lotus, roots and leaves harbored more diverse communities in comparison to rhizomes, fruits, and flowers. A total of 98 genera were shared by lotus and the Dal Lake sediments and water. However, significant differences were found in their relative abundance; for example, Pseudomonas was the most dominant genus on the majority of lotus microhabitats. On the other hand, Flavobacterium was highly abundant in the lake water, while a higher abundance of Acinetobacter was recorded in sediments. Additionally, we also noted the presence of potential human pathogenic genera including Escherichia-Shigella, Enterobacter, Pantoea, Raoultella, Serratia, and Sphingomonas on the lotus microhabitats. Predicted functions of prokaryotic communities revealed a higher abundance of genes associated with nutrient uptake in the microhabitats of the lotus. This study offered first-hand information on the prokaryotic communities harbored by lotus plants and water and sediments of the Dal Lake and demonstrated the adaptation of diverse communities to microhabitats of lotus.


Subject(s)
Nelumbo , Humans , Nelumbo/genetics , Lakes , RNA, Ribosomal, 16S/genetics , Altitude , Water
3.
J Obstet Gynaecol Can ; 41(4): 492-494, 2019 Apr.
Article in English | MEDLINE | ID: mdl-30409570

ABSTRACT

BACKGROUND: Alpha-methylacetoacetic aciduria, an autosomal recessive disorder of isoleucine and ketone body metabolism, is caused by a mutation in the acetyl coenzyme A acetyltransferase-1 gene (ACAT1; 607809) on chromosome 11q22. Ketoacidotic episodes in such patients are triggered by stress situations with increased energy demands. Pregnancy, surgical procedures, and prolonged fasting are potential triggers for metabolic crisis in such cases. CASE: A young Rh-negative Omani woman with alpha-methylacetoacetic aciduria is described here during her second pregnancy. Her metabolic condition was detected at the age of 18 months. She was successfully delivered of a clinically healthy baby through emergency CS for breech presentation. CONCLUSION: Prompt management by a multidisciplinary team is vital to avoid metabolic crisis and to promote a favourable outcome in these cases.


Subject(s)
Acetyl-CoA C-Acyltransferase/deficiency , Amino Acid Metabolism, Inborn Errors , Breech Presentation , Obstetric Labor Complications , Prenatal Care , Cesarean Section , Female , Humans , Infant, Newborn , Pregnancy , Pregnancy Outcome , Young Adult
4.
Int J Syst Evol Microbiol ; 68(3): 865-870, 2018 Mar.
Article in English | MEDLINE | ID: mdl-29458480

ABSTRACT

A novel bacterial strain, IHBB 10212T, of the genus Chryseobacterium was isolated from a glacier near the Kunzum Pass located in the Lahaul-Spiti in the North-Western Himalayas of India. The cells were Gram-negative, aerobic, non-sporulating, single rods, lacked flagella, and formed yellow to orange pigmented colonies. The strain utilized maltose, trehalose, sucrose, gentibiose, glucose, mannose, fructose, mannitol, arabitol and salicin for growth. Flexirubin-type pigments were produced by strain IHBB 10212T. The 16S rRNA gene sequence analysis showed relatedness of strain IHBB 10212T to Chryseobacterium polytrichastri DSM 26899T (97.43 %), Chryseobacterium greenlandense CIP 110007T (97.29 %) and Chryseobacterium aquaticum KCTC 12483T (96.80 %). Iso-C15 : 0 and summed feature 3 (C16 : 1ω7c/C16 : 1ω6c) constituted the major cellular fatty acids. The polar lipids present were six unidentified aminolipids, one unidentified phospholipid and three unidentified lipids. MK-6 was identified as the major quinone. The DNA G+C content was 34.08  mol%. Digital DNA-DNA hybridization of strain IHBB 10212T with C. polytrichastri, C. greenlandense and C. aquaticum showed values far below the prescribed thresholds of 95 % for average nucleotide identity and 70 % for the Genome-to-Genome Distance Calculator for species delineation. Based on its differences from validly published Chryseobacterium species, strain IHBB 10212T is identified as a new species, for which the proposed name is Chryseobacterium glaciei sp. nov., with IHBB 10212T as the type strain (=MTCC 12457T=JCM 31156T=KACC 19170T).


Subject(s)
Chryseobacterium/classification , Ice Cover/microbiology , Phylogeny , Bacterial Typing Techniques , Base Composition , Chryseobacterium/genetics , Chryseobacterium/isolation & purification , DNA, Bacterial/genetics , Fatty Acids/chemistry , India , Nucleic Acid Hybridization , Phospholipids/chemistry , Pigmentation , RNA, Ribosomal, 16S/genetics , Sequence Analysis, DNA , Vitamin K 2/analogs & derivatives , Vitamin K 2/chemistry
5.
Int J Syst Evol Microbiol ; 68(11): 3416-3423, 2018 Nov.
Article in English | MEDLINE | ID: mdl-30204584

ABSTRACT

The novel strain IHBB 11108T was a psychrotolerant and alkaliphilic bacterium isolated from the subsurface water of Chandra Tal Lake in the Lahaul-Spiti valley located in the Indian trans-Himalayas. Cells were Gram-stain-positive, aerobic, non-motile, catalase-positive and oxidase-negative. The strain grew at 5-37 °C (optimum 28 °C), pH 5.0-12.0 (optimum pH 7.0) and with up to 8 % NaCl (optimum 1 %). The 16S rRNA gene sequence analysis revealed the highest relatedness of strain IHBB 11108T with Psychromicrobium silvestre DSM 102047T (97.5 %), Arthrobacter russicus DSM 14555T (97.4 %) and Renibacterium salmoninarum ATCC 33209T (97.4 %). The strain contained a quinone system with 57.2 % MK-9(H2), 39.1 % MK-10(H2), 3.0 % MK-8(H2) and 0.7 % MK-7(H2). The polar lipids detected were diphosphatidylglycerol, dimannosylglyceride, phosphatidylinositol, phosphatidylglycerol, monogalactosyldiacylglycerol, one unidentified glycolipid and four unidentified lipids. The cell-wall peptidoglycan structure type was A3α l-Lys-l-Thr-l-Ala with substitution of the α-carboxyl group of d-Glu by alanine amide. Anteiso-C15 : 0, iso-C16 : 0 and anteiso-C17 : 0 were the predominant fatty acids. The genomic DNA G+C content was 59.0 mol%. The DNA-DNA relatedness of strain IHBB 11108T was 46.7±2.2, 43.1±2.5 and 19.1±2.4 % with P. silvestre DSM 102047T, A. russicus DSM 14555T and R. salmoninarum ATCC 33209T, respectively. On the basis of the results of the phenotypic, chemotaxonomic and phylogenetic analyses, IHBB 11108T is considered to represent a novel species of the genus Psychromicrobium for which the name Psychromicrobium lacuslunae sp. nov. is proposed. The type strain is IHBB 11108T (=MTCC 12460T=MCC 2780T=JCM 31143T=KACC 19070T).


Subject(s)
Altitude , Lakes/microbiology , Micrococcaceae/classification , Phylogeny , Water Microbiology , Bacterial Typing Techniques , Base Composition , DNA, Bacterial/genetics , Fatty Acids/chemistry , Glycolipids/chemistry , India , Micrococcaceae/genetics , Micrococcaceae/isolation & purification , Peptidoglycan/chemistry , Phospholipids/chemistry , RNA, Ribosomal, 16S/genetics , Sequence Analysis, DNA , Vitamin K 2/chemistry
6.
Exp Cell Res ; 331(1): 123-141, 2015 Feb 01.
Article in English | MEDLINE | ID: mdl-25445786

ABSTRACT

Maintaining the genomic integrity is a constant challenge in proliferating cells. Amongst various proteins involved in this process, Sirtuins play a key role in DNA damage repair mechanisms in yeast as well as mammals. In the present work we report the role of one of the least explored Sirtuin viz., SIRT7, under conditions of genomic stress when treated with doxorubicin. Knockdown of SIRT7 sensitized osteosarcoma (U2OS) cells to DNA damage induced cell death by doxorubicin. SIRT7 overexpression in NIH3T3 delayed cell cycle progression by causing delay in G1 to S transition. SIRT7 overexpressing cells when treated with low dose of doxorubicin (0.25 µM) showed delayed onset of senescence, lesser accumulation of DNA damage marker γH2AX and lowered levels of growth arrest markers viz., p53 and p21 when compared to doxorubicin treated control GFP expressing cells. Resistance to DNA damage following SIRT7 overexpression was also evident by EdU incorporation studies where cellular growth arrest was significantly delayed. When treated with higher dose of doxorubicin (>1 µM), SIRT7 conferred resistance to apoptosis by attenuating stress activated kinases (SAPK viz., p38 and JNK) and p53 response thereby shifting the cellular fate towards senescence. Interestingly, relocalization of SIRT7 from nucleolus to nucleoplasm together with its co-localization with SAPK was an important feature associated with DNA damage. SIRT7 mediated resistance to doxorubicin induced apoptosis and senescence was lost when p53 level was restored by nutlin treatment. Overall, we propose SIRT7 attenuates DNA damage, SAPK activation and p53 response thereby promoting cellular survival under conditions of genomic stress.


Subject(s)
Cell Proliferation , DNA Damage/genetics , Genomic Instability , Mitogen-Activated Protein Kinase 8/metabolism , Osteosarcoma/pathology , Sirtuins/metabolism , Tumor Suppressor Protein p53/metabolism , Animals , Apoptosis , Blotting, Western , Bone Neoplasms/genetics , Bone Neoplasms/metabolism , Bone Neoplasms/pathology , Cell Cycle , Flow Cytometry , Humans , Mice , NIH 3T3 Cells , Osteosarcoma/genetics , Osteosarcoma/metabolism , RNA, Small Interfering/genetics , Sirtuins/antagonists & inhibitors , Sirtuins/genetics , Tumor Cells, Cultured
7.
Tumour Biol ; 36(8): 6159-71, 2015 Aug.
Article in English | MEDLINE | ID: mdl-25794641

ABSTRACT

Sirtuins belong to the family of class III histone deacetylases; its role in neoplasia is controversial as both tumor-suppressive and promoting functions have been reported. There are very few reports available, where expressions of sirtuin isoforms are comprehensively analyzed during neoplasia. Therefore, in the present study, the expression of SIRT1, SIRT2, and SIRT7 during different stages of cervical cancer progression was analyzed. The normal cervical epithelium showed feeble expression of sirtuin isoforms, SIRT1, SIRT2, and SIRT7. A significant increase in SIRT1 expression was noted in the cytoplasm as well as in the nucleus of proliferative layers of cervical epithelium in squamous intraepithelial lesions (SIL); however, in the squamous cell carcinomas (SCC), a heterogeneous pattern of SIRT1 expression varying from low to high was noted. A progressive increase in the expression of both SIRT2 and SIRT7 was noted during cancer progression in the following order: normal < preneoplasia < cancer. Cervical cancer cell lines, HeLa and SiHa, showed higher levels of SIRT1 and SIRT2 in comparison to the immortalized cell counterpart, HaCaT. Specific inhibitors of SIRT1 (Ex527) and SIRT2 (AGK2) impaired the growth of the cervical cancer cells, SiHa, but not of the HaCaT cells. SIRT1 inhibition caused cell death, while SIRT2 inhibition resulted in cell cycle arrest. In conclusion, we report the overexpression of SIRT2 and SIRT7 proteins in cervical cancer and suggest probable application of sirtuin inhibitors as therapeutic targets. Further, a specific increase in the levels of SIRT1 in intraepithelial lesion makes it a promising candidate for identification of preneoplastic changes.


Subject(s)
Sirtuin 1/biosynthesis , Sirtuin 2/biosynthesis , Sirtuins/biosynthesis , Uterine Cervical Neoplasms/genetics , Carbazoles/administration & dosage , Carcinogenesis/drug effects , Carcinogenesis/genetics , Cell Cycle Checkpoints/genetics , Cell Proliferation/drug effects , Cell Proliferation/genetics , Female , Furans/administration & dosage , Gene Expression Regulation, Neoplastic/drug effects , HeLa Cells , Humans , Quinolines/administration & dosage , Sirtuin 1/antagonists & inhibitors , Sirtuin 1/genetics , Sirtuin 2/antagonists & inhibitors , Sirtuin 2/genetics , Sirtuins/antagonists & inhibitors , Sirtuins/genetics , Uterine Cervical Neoplasms/drug therapy , Uterine Cervical Neoplasms/pathology
8.
Biotechnol Appl Biochem ; 62(2): 226-36, 2015.
Article in English | MEDLINE | ID: mdl-24923632

ABSTRACT

In recent years, nitrilases from fungus have received increasing attention, and most of the studies are performed on nitrilases of bacterial origin. Frequently used methods are based on analytical methods such as high-performance liquid chromatography, liquid chromatography-mass spectrometry, and gas chromatography; therefore, an efficient, user friendly, and rapid method has been developed to screen nitrilase enzyme based on the principle of color change of a pH indicator. Phenol red amended with the minimal medium appears light yellow at neutral pH, which changes into pink with the formation of ammonia, indicating nitrilase activity in the reaction medium. A highly potent strain ED-3 identified as Fusarium oxysporum f. sp. lycopercisi (specific activity 17.5 µmol/Min/mg dcw) was isolated using this method. The nitrilase activity of F. oxysporum f. sp. lycopercisi ED-3 strain showed wide substrate specificity toward aliphatic nitriles, aromatic nitriles, and orthosubstituted heterocyclic nitriles. 4-Aminobenzonitrile was found to be a superior substrate among all the nitriles used in this study. This nitrilase was active within pH 5-10 and temperature ranging from 25 to 60 °C with optimal at pH 7.0 and temperature at 50 °C. The nitrilase activity was enhanced to several folds through optimization of culture and biotransformation conditions from 1,121 to 1,941 µmol/Min.


Subject(s)
Aminohydrolases/biosynthesis , Aminohydrolases/chemistry , Fusarium/classification , Fusarium/enzymology , Nitriles/chemistry , Aminohydrolases/isolation & purification , Enzyme Activation , Fusarium/isolation & purification , Hydrolysis , Species Specificity , Substrate Specificity
10.
Indian J Otolaryngol Head Neck Surg ; 75(3): 2417-2419, 2023 Sep.
Article in English | MEDLINE | ID: mdl-37636785

ABSTRACT

Airway management in a case of parapharyngeal abscess is challenging as there can be airway obstruction during anaesthetic induction. We describe airway management in 13-yr-old child with parapharyngeal abscess scheduled for incision and drainage. Informed consent was taken for publishing this case report.

11.
Cureus ; 14(10): e29811, 2022 Oct.
Article in English | MEDLINE | ID: mdl-36337794

ABSTRACT

Background and objective Good health and well-being occupy the third position among 17 sustainable development goals designed by the United Nations. The key to reducing maternal and newborn morbidity and mortality is competent and skilled birth attendance. The objectives of this study were to assess and compare the pre-test and post-test knowledge and expressed practices regarding selected obstetrical emergencies among staff nurses; to develop and determine the effectiveness of planned teaching programs on selected obstetrical emergencies among staff nurses; and to find out the correlation between knowledge and expressed practices regarding selected obstetrical emergencies. Materials and methods A pre-experimental study was conducted for a period of one month in 2019 among 60 staff nurses in selected hospitals through a validated tool/questionnaire, which was piloted on six staff nurses prior to starting the study. Data were collected using a structured knowledge questionnaire and expressed practices checklist. Results Of note, 70% of participants had General Nursing and Midwifery (GNM) as a professional qualification. The majority (51.7%) had one to five years of work experience; 46.7% of staff nurses had good knowledge in the pre-test assessment and 95% had good knowledge in the post-test evaluation. Significantly, 80% showed good expressed practices in the pre-test and 96.7% revealed good expressed practices in the post-test regarding selected obstetrical emergencies. In the pre-test, there was a significant association between the sociodemographic variables (age and work experience) with expressed practices, while that was not the case with post-test expressed practices. No significant association was found between pre- and post-test knowledge and selected demographic variables. There was a significant difference between pre-test and post-test knowledge and expressed practices score (mean pre- and post-test knowledge score: 18.82 vs. 25.43, p<0.001; mean pre- and post-test expressed practices score: 14.43 vs. 16.30, p<0.001). Conclusion Based on our findings, the planned teaching program is effective in improving the knowledge and expressed practices of staff nurses regarding selected obstetrical emergencies.

13.
Sultan Qaboos Univ Med J ; 21(2): e308-e311, 2021 May.
Article in English | MEDLINE | ID: mdl-34221481

ABSTRACT

Paraovarian cysts constitute about 10% of all adnexal masses in females and occur most commonly in the third and fourth decades of life. These cysts are benign and usually uncommon in adolescence. Such cysts pose a diagnostic challenge while distinguishing them from ovarian cysts clinically and during radiological investigations. We report a rare case of a 13-year-old female patient with bilateral paraovarian cysts, including a giant cyst in right mesosalpinx presenting to Sohar hospital, Oman in 2018. The definitive origin of the huge mass on the right side of abdominal cavity could not be established in the current case despite contrast enhanced computerized tomography. It was only on laparoscopic exploration that this mass was identified as a giant paraovarian cyst. Both the giant cyst and a smaller paraovarian cyst on the left side were enucleated with minimally invasive surgery while preserving the fertility of the patient. Only one other similar case of bilateral paraovarian cysts in an adolescent, including a giant cyst managed with laparoscopy, has been documented previously.


Subject(s)
Broad Ligament , Minimally Invasive Surgical Procedures , Parovarian Cyst , Adolescent , Broad Ligament/diagnostic imaging , Broad Ligament/surgery , Cysts/diagnosis , Cysts/surgery , Female , Humans , Laparoscopy , Oman , Parovarian Cyst/diagnostic imaging , Parovarian Cyst/surgery , Treatment Outcome , Ultrasonography
14.
Cancers (Basel) ; 14(1)2021 Dec 22.
Article in English | MEDLINE | ID: mdl-35008200

ABSTRACT

E6 from high-risk strains of HPV is well known to transform cells by deregulating p53. We reported that in HPV transformed cell-lines E6 from high-risk HPV can recruit the USP46 deubiquitinase to substrates such as Cdt2 and stabilize the latter, and that USP46 is important for growth of HPV induced tumors in xenografts. Here we show that in cervical cancer biopsies the stabilization of Cdt2 in the HPV-induced cancers leads to the decrease of a CRL4-Cdt2 substrate, the histone H4K20 mono-methyltransferase Set8, and decrease in H4K20me1 or H4K20me3 that can be detected by immunohistochemistry. In HPV-transformed cancer cell lines in vitro, knockdown of E6 decreases Cdt2 and increases Set8. Co-knockdown of Set8 shows that some of the gene expression changes produced by E6 knockdown is due to the increase of Set8. EGFR and EGFR regulated genes were identified in this set of genes. Turning to the mechanism by which E6 stabilizes Cdt2, we find that a purified E6:USP46 complex has significantly more de-ubiquitinase activity in vitro than USP46 alone, demonstrating that E6 can directly interact with USP46 in the absence of other proteins and that it can substitute for the known activators of USP46, UAF1 and WDR20. Deletion mapping of Cdt2 shows that there are three discrete, but redundant, parts of the substrate that are essential for stabilization by E6: USP46. The helix-loop-helix region or the WD40 repeat driven beta-propeller structure of Cdt2 are dispensable for the stabilization implying that interaction with DDB1 (and the rest of the CRL4 complex) or with the substrate of the CRL4-Cdt2 E3 ligase is not necessary for E6:USP46 to interact with and stabilize Cdt2. The identification of 50 amino acid stretches in the 731 amino acid Cdt2 protein as being important for the stabilization by E6 underlines the specificity of the process. In summary, E6 activates the deubiquitinase activity of USP46, stabilizes Cdt2 utilizing multiple sites on Cdt2, and leads to degradation of Set8 and changes in gene-expression in HPV-transformed cells.

15.
J Exp Med ; 218(11)2021 11 01.
Article in English | MEDLINE | ID: mdl-34546338

ABSTRACT

Activating mutations in receptor guanylyl cyclase C (GC-C), the target of gastrointestinal peptide hormones guanylin and uroguanylin, and bacterial heat-stable enterotoxins cause early-onset diarrhea and chronic inflammatory bowel disease (IBD). GC-C regulates ion and fluid secretion in the gut via cGMP production and activation of cGMP-dependent protein kinase II. We characterize a novel mouse model harboring an activating mutation in Gucy2c equivalent to that seen in an affected Norwegian family. Mutant mice demonstrated elevated intestinal cGMP levels and enhanced fecal water and sodium content. Basal and linaclotide-mediated small intestinal transit was higher in mutant mice, and they were more susceptible to DSS-induced colitis. Fecal microbiome and gene expression analyses of colonic tissue revealed dysbiosis, up-regulation of IFN-stimulated genes, and misregulation of genes associated with human IBD and animal models of colitis. This novel mouse model thus provides molecular insights into the multiple roles of intestinal epithelial cell cGMP, which culminate in dysbiosis and the induction of inflammation in the gut.


Subject(s)
Colitis/metabolism , Colon/metabolism , Cyclic GMP/metabolism , Dysbiosis/metabolism , Intestines/metabolism , Mutation/genetics , Receptors, Enterotoxin/genetics , Animals , Cyclic GMP-Dependent Protein Kinase Type II/metabolism , Disease Models, Animal , Gene Expression/genetics , Inflammation/genetics , Inflammation/metabolism , Inflammatory Bowel Diseases/genetics , Inflammatory Bowel Diseases/metabolism , Intestinal Mucosa/metabolism , Mice , Receptors, Enterotoxin/metabolism , Signal Transduction/genetics
16.
Front Oncol ; 10: 740, 2020.
Article in English | MEDLINE | ID: mdl-32656073

ABSTRACT

SIRT7 belongs to the family of "NAD+ dependent deacetylases" called Sirtuins. In the present work we report a novel role of SIRT7 in regulating cellular polarity. SIRT7 overexpression in immortalized mouse fibroblasts (NIH3T3) induced epithelial transition. This transition was accompanied by typical N- to E- cadherin transition, stabilization of ß-catenin, and the downregulation of transcription factors responsible for maintenance of mesenchymal phenotype (Snail, Slug, and Zeb1). Interestingly, a subpopulation of cells overexpressing SIRT7 exhibited an intermediate stage between mesenchymal and epithelial characters. Transformed epithelial cells showed a loss of heterochromatisation as evidenced by a loss of HP1α and H3K9 dimethylation staining. In conclusion, we report a role of SIRT7 in mesenchymal cells, which may have implications for health and disease.

17.
Sci Adv ; 6(20): eaba2489, 2020 05.
Article in English | MEDLINE | ID: mdl-32440553

ABSTRACT

Extrachromosomal circular DNAs (eccDNAs) are somatically mosaic and contribute to intercellular heterogeneity in normal and tumor cells. Because short eccDNAs are poorly chromatinized, we hypothesized that they are sequenced by tagmentation in ATAC-seq experiments without any enrichment of circular DNA. Indeed, ATAC-seq identified thousands of eccDNAs in cell lines that were validated by inverse PCR and by metaphase FISH. ATAC-seq in gliomas and glioblastomas identify hundreds of eccDNAs, including one containing the well-known EGFR gene amplicon from chr7. More than 18,000 eccDNAs, many carrying known cancer driver genes, are identified in a pan-cancer analysis of ATAC-seq libraries from 23 tumor types. Somatically mosaic eccDNAs are identified by ATAC-seq even before amplification is recognized by genome-wide copy number variation measurements. Thus, ATAC-seq is a sensitive method to detect eccDNA present in a tumor at the pre-amplification stage and can be used to predict resistance to therapy.


Subject(s)
Chromatin Immunoprecipitation Sequencing , Neoplasms , Cell Line , DNA/genetics , DNA Copy Number Variations , DNA, Circular/genetics , Humans
18.
Ann Hepatobiliary Pancreat Surg ; 24(4): 484-495, 2020 Nov 30.
Article in English | MEDLINE | ID: mdl-33234752

ABSTRACT

BACKGROUNDS/AIMS: Lymph node (LN) metastasis though, is a poor prognostic factor for ampullary carcinoma (APC), the impact of Lymph node ratio (LNR) and Logarithm odds of positive lymph node (LODDS) in the long-term survival remains controversial. We evaluated the factors affecting the long-term outcome in APC patients with emphasis on LNR and LODDS. METHODS: The prospectively collected data of 198 patients who underwent pancreatoduodenectomy for APC was analyzed after excluding 12 patients for various reasons. Factors affecting Disease specific survival (DSS) and Recurrence free survival (RFS) were analyzed with special reference to LN positivity, LNR and LODDS. RESULTS: Out of 186, 117 (62.9%) patients were alive at a median follow-up of 39.5 months and 72 (38.7%) developed recurrence. The overall 5-year DSS was 59.3% & RFS 54.9%. Univariate analysis showed T-stage, tumor differentiation, perineural invasion, LN positivity, LNR and LODDS was significantly affected DSS and RFS. On multivariate analysis, perineural invasion, LN positivity, LNR and LODDS lost its significance for DSS and RFS. AUC for prediction of DSS and RFS for LNR was 0.654 (p<0.001) & 0.629 (p=0.003) respectively and for LODDS, it was 0.697 (p<0.001) & 0.677 (p=0.001) respectively. Sensitivity and specificity of LNR (0.1) for DSS were 37.7% & 83.8% and for RFS were 36.1% & 83.3%; for LODDS (-1.00), sensitivity and specificity for DSS was 62.3% and 67.5% and for RFS it was 59.7% and 66.7% respectively. CONCLUSIONS: LNR and LODDS although independently seem to affect the RFS and DSS, albeit have a low sensitivity and specificity in predicting DSS and RFS.

19.
Syst Appl Microbiol ; 43(5): 126127, 2020 Sep.
Article in English | MEDLINE | ID: mdl-32847793

ABSTRACT

Three strains of rhizobia isolated from effective root nodules of pea (Pisum sativum L.) collected from the Indian trans-Himalayas were characterized using 16S rRNA, atpD and recA genes. Phylogeny of the 16S rRNA genes revealed that the newly isolated strains were members of the genus Rhizobium with ≥99.9% sequence similarity to the members within the "Rhizobium leguminosarum" group. Phylogenetic analyses based on the concatenated sequences of atpD and recA gene, and 92 core genes extracted from the genome sequences indicated that strains JKLM 12A2T and JKLM 13E are grouped as a separate clade closely related to R. laguerreae FB206T. In contrast, the strain JKLM 19E was placed with "R. hidalgonense" FH14T. Whole-genome average nucleotide identity (ANI) values were 97.6% within strains JKLM 12A2T and JKLM 13E, and less than 94% with closely related species. The digital DNA-DNA hybridization (dDDH) values were 81.45 within the two strains and less than 54.8% to closely related species. The major cellular fatty acids were C18:1w7c in summed feature 8, C14:0 3OH/C16:1 iso I in summed feature 2, and C18:0. The DNA G+C content of JKLM 12A2T and JKLM 13E was 60.8mol%. The data on genomic, chemotaxonomic, and phenotypic characteristics indicates that the strains JKLM 12A2T and JKLM 13E represent a novel species, Rhizobium indicum sp. nov. The type strain is JKLM 12A2T (= MCC 3961T=KACC 21380T=JCM 33658T). However, the strain JKLM 19E represents a member of "R. hidalgonense" and the symbiovar viciae.


Subject(s)
Pisum sativum/microbiology , Rhizobium/classification , Rhizobium/isolation & purification , Root Nodules, Plant/microbiology , Bacterial Typing Techniques , Crops, Agricultural/microbiology , DNA, Bacterial/genetics , Fatty Acids/analysis , Genes, Bacterial , Genes, rRNA , Genome, Bacterial , Genomics , India , Phylogeny , RNA, Ribosomal, 16S/genetics , Rhizobium/genetics , Rhizobium/physiology , Rhizobium leguminosarum/genetics , Sequence Analysis, DNA , Symbiosis
20.
Genome Med ; 12(1): 15, 2020 02 17.
Article in English | MEDLINE | ID: mdl-32066500

ABSTRACT

BACKGROUND: While clinical factors such as age, grade, stage, and histological subtype provide physicians with information about patient prognosis, genomic data can further improve these predictions. Previous studies have shown that germline variants in known cancer driver genes are predictive of patient outcome, but no study has systematically analyzed multiple cancers in an unbiased way to identify genetic loci that can improve patient outcome predictions made using clinical factors. METHODS: We analyzed sequencing data from the over 10,000 cancer patients available through The Cancer Genome Atlas to identify germline variants associated with patient outcome using multivariate Cox regression models. RESULTS: We identified 79 prognostic germline variants in individual cancers and 112 prognostic germline variants in groups of cancers. The germline variants identified in individual cancers provide additional predictive power about patient outcomes beyond clinical information currently in use and may therefore augment clinical decisions based on expected tumor aggressiveness. Molecularly, at least 12 of the germline variants are likely associated with patient outcome through perturbation of protein structure and at least five through association with gene expression differences. Almost half of these germline variants are in previously reported tumor suppressors, oncogenes or cancer driver genes with the other half pointing to genomic loci that should be further investigated for their roles in cancers. CONCLUSIONS: Germline variants are predictive of outcome in cancer patients and specific germline variants can improve patient outcome predictions beyond predictions made using clinical factors alone. The germline variants also implicate new means by which known oncogenes, tumor suppressor genes, and driver genes are perturbed in cancer and suggest roles in cancer for other genes that have not been extensively studied in oncology. Further studies in other cancer cohorts are necessary to confirm that germline variation is associated with outcome in cancer patients as this is a proof-of-principle study.


Subject(s)
Biomarkers, Tumor/genetics , Germ-Line Mutation , Neoplasms/genetics , Genetic Testing/statistics & numerical data , Humans , Neoplasms/pathology , Oncogene Proteins/genetics , Polymorphism, Single Nucleotide , Quantitative Trait Loci , Tumor Suppressor Proteins/genetics
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