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Znajdek MZ, Gietka P, Mańczak M, Kotecki M, Sudoł-Szopińska I. Comparison of the New York and the Modified New York Radiographic Criteria and MRI in 168 Patients Clinically Suspected for Juvenile Sacroiliitis. Semin Musculoskelet Radiol 2021. [DOI: 10.1055/s-0041-1731573] [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: 10/21/2022]
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2
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Kotecki M, Gasik R, Sudoł-Szopińska I. Cervical Spine Involvement in Patients with Rheumatoid Arthritis: Radiographic and MRI Findings in the Era of Biological Treatment. Semin Musculoskelet Radiol 2021. [DOI: 10.1055/s-0041-1731548] [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: 10/21/2022]
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3
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Kotecki M, Gietka P, Sudoł-Szopińska I. Cervical Spine Involvement in Patients with Juvenile Idiopathic Arthritis: Radiographic and MRI Findings. Semin Musculoskelet Radiol 2021. [DOI: 10.1055/s-0041-1731549] [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: 10/21/2022]
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4
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Janecki DM, Sajek M, Smialek MJ, Kotecki M, Ginter-Matuszewska B, Kuczynska B, Spik A, Kolanowski T, Kitazawa R, Kurpisz M, Jaruzelska J. SPIN1 is a proto-oncogene and SPIN3 is a tumor suppressor in human seminoma. Oncotarget 2018; 9:32466-32477. [PMID: 30197756 PMCID: PMC6126697 DOI: 10.18632/oncotarget.25977] [Citation(s) in RCA: 19] [Impact Index Per Article: 3.2] [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] [Received: 01/20/2018] [Accepted: 07/31/2018] [Indexed: 12/14/2022] Open
Abstract
SPIN1 is necessary for normal meiotic progression in mammals. It is overexpressed in human ovarian cancers and some cancer cell lines. Here, we examined the functional significance and regulation of SPIN1 and SPIN3 in the TCam-2 human seminoma cell line. We found that while SPIN1 overexpression reduced apoptosis in these cells, SPIN3 overexpression induced it. Similarly, SPIN1 upregulated and SPIN3 downregulated CYCD1, which is a downstream target of the PI3K/AKT pathway and contributes to apoptosis resistance in cancer cell lines. It appears that SPIN1 is pro-oncogenic and SPIN3 acts as a tumor suppressor in TCam-2 cells. To our knowledge, this is the first report of SPIN3 tumor suppressor activity. However, both SPIN1 and SPIN3 stimulated cell cycle progression. In addition, using luciferase reporters carrying SPIN1 or SPIN3 mRNA 3′UTRs, we found that PUM1 and PUM2 targeted and repressed SPINs. We also found that PUM1 itself strongly stimulated apoptosis and moderately slowed cell cycle progression in TCam-2 cells, suggesting that PUM1, like SPIN3, is a tumor suppressor. Our findings suggest that acting, at least in part, through SPIN1 and SPIN3, PUM proteins contribute to a mechanism promoting normal human male germ cell apoptotic status and thus preventing cancer.
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Affiliation(s)
| | - Marcin Sajek
- Institute of Human Genetics, Polish Academy of Sciences, Poznan, Poland
| | | | - Maciej Kotecki
- Institute of Human Genetics, Polish Academy of Sciences, Poznan, Poland.,Department of Developmental, Molecular and Chemical Biology, Tufts University Medical School, Boston, Massachusetts, U.S.A
| | | | - Bogna Kuczynska
- Institute of Human Genetics, Polish Academy of Sciences, Poznan, Poland
| | - Anna Spik
- Institute of Human Genetics, Polish Academy of Sciences, Poznan, Poland
| | - Tomasz Kolanowski
- Institute of Human Genetics, Polish Academy of Sciences, Poznan, Poland.,Institute of Pharmacology and Toxicology, Technische Universität Dresden, Germany
| | - Riko Kitazawa
- Division of Molecular Pathology, Ehime University, Graduate School of Medicine, Shitsukawa, Toon City, Ehime, Japan
| | - Maciej Kurpisz
- Institute of Human Genetics, Polish Academy of Sciences, Poznan, Poland
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Kusz-Zamelczyk K, Sajek M, Spik A, Glazar R, Jędrzejczak P, Latos-Bieleńska A, Kotecki M, Pawelczyk L, Jaruzelska J. Mutations of NANOS1, a human homologue of the Drosophila morphogen, are associated with a lack of germ cells in testes or severe oligo-astheno-teratozoospermia. J Med Genet 2013; 50:187-93. [PMID: 23315541 DOI: 10.1136/jmedgenet-2012-101230] [Citation(s) in RCA: 52] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/04/2022]
Abstract
BACKGROUND The Nanos gene is a key translational regulator of specific mRNAs involved in Drosophila germ cell development. Disruption of mammalian homologues, Nanos2 or Nanos3, causes male infertility in mice. In humans, however, no evidence of NANOS2 or NANOS3 mutations causing male infertility has been reported. Although Nanos1 seems dispensable for mouse reproduction, we sought to analyse for the first time its homologue in infertile men. METHODS A group of 195 patients manifesting non-obstructive azoospermia or oligozoospermia were tested for mutations of the NANOS1 gene, using single-strand conformation polymorphism and DNA sequencing. RESULTS Three types of NANOS1 gene mutations were identified in five patients and were absent in 800 chromosomes of fertile men. Pedigree analysis indicated a dominant inheritance pattern with penetration limited to males. Two mutations caused deletions of single amino acids, p.Pro77_Ser78delinsPro and p.Ala173del, each of them identified in two unrelated patients. Both types of deletions were located in the NANOS1 N-terminus (responsible for protein interactions) and were associated with a lack of germ cells in testes. Interestingly, the Pro77_Ser78delinsPro mutation altered interaction of NANOS1 with a microRNA biogenesis factor, GEMIN3. The third identified mutation, p.[(Arg246His; Arg276Tyr)], found in the C-terminal RNA-binding domain, was present in a single oligo-astheno-teratozoospermic man. We bioinformatically demonstrated that the p.Arg246His substitution causes a decrease in the positive charge of this domain, potentially altering RNA-binding. CONCLUSIONS This is the first report describing the association of NANOS1 gene mutations with human infertility. Two different infertility phenotypes may reflect distinct functions of N-terminal versus C-terminal regions of NANOS1.
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Affiliation(s)
- Kamila Kusz-Zamelczyk
- Polish Academy of Sciences, Institute of Human Genetics, Strzeszyńska 32, Poznań 60-479, Poland
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6
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Kotecki M, Zeiger AS, Van Vliet K, Herman IM. Calpain- and talin-dependent control of microvascular pericyte contractility and cellular stiffness. Microvasc Res 2010; 80:339-48. [PMID: 20709086 PMCID: PMC2981705 DOI: 10.1016/j.mvr.2010.07.012] [Citation(s) in RCA: 33] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/01/2010] [Revised: 07/26/2010] [Accepted: 07/30/2010] [Indexed: 01/09/2023]
Abstract
Pericytes surround capillary endothelial cells and exert contractile forces modulating microvascular tone and endothelial growth. We previously described pericyte contractile phenotype to be Rho GTPase- and α-smooth muscle actin (αSMA)-dependent. However, mechanisms mediating adhesion-dependent shape changes and contractile force transduction remain largely equivocal. We now report that the neutral cysteine protease, calpain, modulates pericyte contractility and cellular stiffness via talin, an integrin-binding and F-actin associating protein. Digital imaging and quantitative analyses of living cells reveal significant perturbations in contractile force transduction detected via deformation of silicone substrata, as well as perturbations of mechanical stiffness in cellular contractile subdomains quantified via atomic force microscope (AFM)-enabled nanoindentation. Pericytes overexpressing GFP-tagged talin show significantly enhanced contractility (~two-fold), which is mitigated when either the calpain-cleavage resistant mutant talin L432G or vinculin are expressed. Moreover, the cell-penetrating, calpain-specific inhibitor termed CALPASTAT reverses talin-enhanced, but not Rho GTP-dependent, contractility. Interestingly, our analysis revealed that CALPASTAT, but not its inactive mutant, alters contractile cell-driven substrata deformations while increasing mechanical stiffness of subcellular contractile regions of these pericytes. Altogether, our results reveal that calpain-dependent cleavage of talin modulates cell contractile dynamics, which in pericytes may prove instrumental in controlling normal capillary function or microvascular pathophysiology.
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Affiliation(s)
- Maciej Kotecki
- Department of Physiology, and The Center for Innovations in Wound Healing Research, Tufts University School of Medicine, 150 Harrison Avenue, Boston, MA 02111 USA
| | - Adam S. Zeiger
- Department of Materials Science and Engineering, Massachusetts Institute of Technology, 77 Massachusetts Avenue, Cambridge, MA 02139 USA
| | - Krystyn Van Vliet
- Department of Materials Science and Engineering, Massachusetts Institute of Technology, 77 Massachusetts Avenue, Cambridge, MA 02139 USA
- Department of Biological Engineering, Massachusetts Institute of Technology, 77 Massachusetts Avenue, Cambridge, MA 02139 USA
| | - Ira M. Herman
- Department of Physiology, and The Center for Innovations in Wound Healing Research, Tufts University School of Medicine, 150 Harrison Avenue, Boston, MA 02111 USA
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7
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Lee S, Zeiger A, Maloney JM, Kotecki M, Van Vliet KJ, Herman IM. Pericyte actomyosin-mediated contraction at the cell-material interface can modulate the microvascular niche. J Phys Condens Matter 2010; 22:194115. [PMID: 21386441 DOI: 10.1088/0953-8984/22/19/194115] [Citation(s) in RCA: 43] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/30/2023]
Abstract
Pericytes physically surround the capillary endothelium, contacting and communicating with associated vascular endothelial cells via cell-cell and cell-matrix contacts. Pericyte-endothelial cell interactions thus have the potential to modulate growth and function of the microvasculature. Here we employ the experimental finding that pericytes can buckle a freestanding, underlying membrane via actin-mediated contraction. Pericytes were cultured on deformable silicone substrata, and pericyte-generated wrinkles were imaged via both optical and atomic force microscopy (AFM). The local stiffness of subcellular domains both near and far from these wrinkles was investigated by using AFM-enabled nanoindentation to quantify effective elastic moduli. Substratum buckling contraction was quantified by the normalized change in length of initially flat regions of the substrata (corresponding to wrinkle contour lengths), and a model was used to relate local strain energies to pericyte contractile forces. The nature of pericyte-generated wrinkling and contractile protein-generated force transduction was further explored by the addition of pharmacological cytoskeletal inhibitors that affected contractile forces and the effective elastic moduli of pericyte domains. Actin-mediated forces are sufficient for pericytes to exert an average buckling contraction of 38% on the elastomeric substrata employed in these in vitro studies. Actomyosin-mediated contractile forces also act in vivo on the compliant environment of the microvasculature, including the basement membrane and other cells. Pericyte-generated substratum deformation can thus serve as a direct mechanical stimulus to adjacent vascular endothelial cells, and potentially alter the effective mechanical stiffness of nonlinear elastic extracellular matrices, to modulate pericyte-endothelial cell interactions that directly influence both physiologic and pathologic angiogenesis.
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Affiliation(s)
- Sunyoung Lee
- Department of Materials Science and Engineering, Massachusetts Institute of Technology, Cambridge, MA 02139, USA
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8
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Gryczyńska D, Andrzejewski J, Gęsicki T, Kotecki M. Sprawozdanie z XXXI Krajowej Konferencji Naukowo-Szkoleniowej pt. „Problemy otorynolaryngologii dziecięcej w codziennej praktyce”. Otolaryngol Pol 2010. [DOI: 10.1016/s0030-6657(10)70048-2] [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: 11/15/2022]
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9
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Carette JE, Guimaraes CP, Varadarajan M, Park AS, Wuethrich I, Godarova A, Kotecki M, Cochran BH, Spooner E, Ploegh HL, Brummelkamp TR. Haploid genetic screens in human cells identify host factors used by pathogens. Science 2009; 326:1231-5. [PMID: 19965467 DOI: 10.1126/science.1178955] [Citation(s) in RCA: 404] [Impact Index Per Article: 26.9] [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: 01/18/2023]
Abstract
Loss-of-function genetic screens in model organisms have elucidated numerous biological processes, but the diploid genome of mammalian cells has precluded large-scale gene disruption. We used insertional mutagenesis to develop a screening method to generate null alleles in a human cell line haploid for all chromosomes except chromosome 8. Using this approach, we identified host factors essential for infection with influenza and genes encoding important elements of the biosynthetic pathway of diphthamide, which are required for the cytotoxic effects of diphtheria toxin and exotoxin A. We also identified genes needed for the action of cytolethal distending toxin, including a cell-surface protein that interacts with the toxin. This approach has both conceptual and practical parallels with genetic approaches in haploid yeast.
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Affiliation(s)
- Jan E Carette
- Whitehead Institute for Biomedical Research, 9 Cambridge Center, Cambridge, MA 02142, USA
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10
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Abstract
Tinnitus in childhood is quite common when children are directly asked about this syndrom. Children rarely spontaneously complain of tinnitus. Material consists of 67 children (6-18 year old) with tinnitus, treated in the Pediatric Otolaryngology Clinic and Outpatient. Between children there were 2 groups: I tinnitus connected with hearing loss--35 children, II tinnitus without hearing loss--32 children. Methods. Anamnesis, otolaryngologic, neurologic, psychologic examinations, panel of audiologic tests before and after treatment of betahistine. In 12 patients there were recognized conductive hearing loss and they were excluded from therapy of betahistine. 55 children were treated with betahistine (Betaserc). Results indicates that betahistine is a good drug in therapy of tinnitus in children.
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Affiliation(s)
- Danuta Gryczyńska
- Klinika Otolaryngologii, Audiologii i Foniatrii Dzieciecej Uniwersytetu Medycznego w Lodzi
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Gryczyńska D, Andrzejewski J, Kotecki M. Sprawozdanie z XV Krajowego Zjazdu Sekcji Otolaryngologii Dziecięcej Polskiego Towarzystwa Otolaryngologów Chirurgów Głowy i Szyi Wisła 31.05–02.06.2007 r. Otolaryngol Pol 2007. [DOI: 10.1016/s0030-6657(07)70579-6] [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: 11/17/2022]
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Spik A, Oczkowski S, Olszak A, Kotecki M, Formanowicz P, Błazewicz J, Jaruzelska J. Candidate mRNAs interacting with fertility protein PUMILIO2 in the human germ line. Reprod Biol 2006; 6 Suppl 1:37-42. [PMID: 16967088] [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] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/11/2023]
Abstract
Pumilio protein regulates translation of specific mRNAs in morphogenesis and germ-line development of the flies by binding nucleotide motifs GUUGU (A) and AUUGUA (B) in 3'untranslated regions. A human homologue, PUMILIO2 has been recently identified in the germ-line stem cells and the question was raised whether it regulates translation. We designed software to screen the GeneBank for A and B motifs and found that they are not uncommon in the human genome. Moreover, some of the genes containing motifs A and B are germ cell specific, but some others are expressed in a number of other tissues. This may indicate that PUMILIO mediated translational regulation is universally used in developmental processes of the human body.
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Affiliation(s)
- Anna Spik
- Institute of Human Genetics, Polish Academy of Sciences, Poznan, Poland
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13
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Konnikova L, Simeone MC, Kruger MM, Kotecki M, Cochran BH. Signal transducer and activator of transcription 3 (STAT3) regulates human telomerase reverse transcriptase (hTERT) expression in human cancer and primary cells. Cancer Res 2005; 65:6516-20. [PMID: 16061629 DOI: 10.1158/0008-5472.can-05-0924] [Citation(s) in RCA: 85] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Abstract
Signal transducer and activator of transcription 3 (STAT3) is a transcription factor that plays a critical role in cytokine and growth factor signaling and is frequently activated in human tumors. Human telomerase reverse transcriptase (hTERT) is also often overexpressed in tumor cells and mediates cellular immortalization. Here we report that STAT3 directly regulates the expression of hTERT in a variety of human cancer cells. Moreover, STAT3 activity is required for the survival of many human tumors, and hTERT expression contributes to the survival of STAT3-dependent tumor cells. In addition, we find that growth factors and cytokines stimulate hTERT expression in primary human cells in a STAT3-dependent manner. Thus, STAT3 is a key regulator of hTERT expression in both normal and tumor cells.
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Affiliation(s)
- Liza Konnikova
- Department of Physiology, Tufts University, Boston, Massachusetts 02111, USA
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Konnikova L, Kotecki M, Kruger MM, Cochran BH. Knockdown of STAT3 expression by RNAi induces apoptosis in astrocytoma cells. BMC Cancer 2003; 3:23. [PMID: 13678425 PMCID: PMC212316 DOI: 10.1186/1471-2407-3-23] [Citation(s) in RCA: 178] [Impact Index Per Article: 8.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/14/2003] [Accepted: 09/17/2003] [Indexed: 12/11/2022] Open
Abstract
Background Astrocytomas are the most common type of primary central nervous system tumors. They are frequently associated with genetic mutations that deregulate cell cycle and render these tumors resistant to apoptosis. STAT3, signal transducer and activator of transcription 3, participates in several human cancers by inducing cell proliferation and inhibiting apoptosis and is frequently activated in astrocytomas. Methods RNA interference was used to knockdown STAT3 expression in human astrocytes and astrocytoma cell lines. The effect of STAT3 knockdown on apoptosis, cell proliferation, and gene expression was then assessed by standard methods. Results We have found that STAT3 is constitutively activated in several human astrocytoma cell lines. Knockdown of STAT3 expression by siRNA induces morphologic and biochemical changes consistent with apoptosis in several astrocytoma cell lines, but not in primary human astrocytes. Moreover, STAT3 is required for the expression of the antiapoptotic genes survivin and Bcl-xL in the A172 glioblastoma cell line. Conclusion These results show that STAT3 is required for the survival of some astrocytomas. These studies suggest STAT3 siRNA could be a useful therapeutic agent for the treatment of astrocytomas.
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Affiliation(s)
- Liza Konnikova
- Department of Physiology, Tufts University School of Medicine 136 Harrison Ave., Boston, Massachusetts, 02111, USA
| | - Maciej Kotecki
- Department of Physiology, Tufts University School of Medicine 136 Harrison Ave., Boston, Massachusetts, 02111, USA
| | - Mathew M Kruger
- Department of Physiology, Tufts University School of Medicine 136 Harrison Ave., Boston, Massachusetts, 02111, USA
| | - Brent H Cochran
- Department of Physiology, Tufts University School of Medicine 136 Harrison Ave., Boston, Massachusetts, 02111, USA
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15
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Jaruzelska J, Kotecki M, Kusz K, Spik A, Firpo M, Reijo Pera RA. Conservation of a Pumilio-Nanos complex from Drosophila germ plasm to human germ cells. Dev Genes Evol 2003; 213:120-6. [PMID: 12690449 DOI: 10.1007/s00427-003-0303-2] [Citation(s) in RCA: 108] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/04/2002] [Accepted: 12/19/2002] [Indexed: 01/30/2023]
Abstract
Germ cells are the cells which ultimately give rise to mature sperm and eggs. In model organisms such as flies and worms, several genes that are required for formation and maintenance of germ cells have been identified and their interactions are rapidly being delineated. By contrast, little is known of the genes required for development of human germ cells and it is not clear whether findings from model organisms will translate into knowledge of human germ cell development, especially given observations that reproductive pathways may evolve more rapidly than somatic pathways. The Pumilio and Nanos genes have been especially well-characterized in model organisms and encode proteins that interact and are required for development of germ stem cells in one or both sexes. Here we report the first characterization of a mammalian Nanos homolog, human NANOS1 ( NOS1). We show that human NOS1 protein interacts with the human PUMILIO-2 (PUM2) protein via highly conserved domains to form a stable complex. We also show that in men, the NOS1 and PUM2 proteins are particularly abundant in germline stem cells. These observations mirror those in distant species and document for the first time a conserved protein-protein interaction in germ cells from flies to humans. These results suggest the possibility that the interaction of PUM2 and NOS1 may play a conserved role in germ cell development and maintenance in humans as in model organisms.
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Affiliation(s)
- Jadwiga Jaruzelska
- Center for Reproductive Sciences, Department of Obstetrics, Gynecology and Reproductive Sciences, University of California at San Francisco, San Francisco, CA 94143-0546, USA
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16
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Pustejovsky J, Castaño J, Zhang J, Kotecki M, Cochran B. Robust relational parsing over biomedical literature: extracting inhibit relations. Pac Symp Biocomput 2002:362-73. [PMID: 11928490 DOI: 10.1142/9789812799623_0034] [Citation(s) in RCA: 30] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
Abstract
We describe the design of a robust parser for identifying and extracting biomolecular relations from the biomedical literature. Separate automata over distinct syntactic domains were developed for extraction of nominal-based relational information versus verbal-based relations. This allowed us to optimize the grammars separately for each module, regardless of any specific relation resulting in significantly better performance. A unique feature of this system is the use of text-based anaphora resolution to enhance the results of argument binding in relational extraction. We demonstrate the performance of our system on inhibition-relations, and present our initial results measured against an annotated text used as a gold standard for evaluation purposes. The results represent a significant improvement over previously published results on extracting such relations from Medline: Precision was 90%, Recall 57%, and Partial Recall 22%. These results demonstrate the effectiveness of a corpus-based linguistic approach to information extraction over Medline.
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Affiliation(s)
- J Pustejovsky
- Department of Computer Science, Brandeis University, 415 South St., Waltham, MA 02454, USA.
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17
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Pustejovsky J, Castaño J, Cochran B, Kotecki M, Morrell M. Automatic extraction of acronym-meaning pairs from MEDLINE databases. Stud Health Technol Inform 2002; 84:371-5. [PMID: 11604766] [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] [Grants] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/21/2023]
Abstract
Acronyms are widely used in biomedical and other technical texts. Understanding their meaning constitutes an important problem in the automatic extraction and mining of information from text. Here we present a system called ACROMED that is part of a set of Information Extraction tools designed for processing and extracting information from abstracts in the Medline database. In this paper, we present the results of two strategies for finding the long forms for acronyms in biomedical texts. These strategies differ from previous automated acronym extraction methods by being tuned to the complex phrase structures of the biomedical lexicon and by incorporating shallow parsing of the text into the acronym recognition algorithm. The performance of our system was tested with several data sets obtaining a performance of 72 % recall with 97 % precision. These results are found to be better for biomedical texts than the performance of other acronym extraction systems designed for unrestricted text.
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Affiliation(s)
- J Pustejovsky
- Laboratory for Linguistics and Computation at Brandeis University, Waltham, MA, USA
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18
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Jaruzelska J, Korcz A, Wojda A, Jedrzejczak P, Bierla J, Surmacz T, Pawelczyk L, Page DC, Kotecki M. Mosaicism for 45,X cell line may accentuate the severity of spermatogenic defects in men with AZFc deletion. J Med Genet 2001; 38:798-802. [PMID: 11732492 PMCID: PMC1734763 DOI: 10.1136/jmg.38.11.798] [Citation(s) in RCA: 37] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/04/2022]
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Wojda A, Korcz A, Jedrzejczak P, Kotecki M, Pawelczyk L, Latos-Bieleńska A, Wolnik-Brzozowska D, Jaruzelska J. [Importance of cytogenetic analysis in patients with azoospermia or severe oligozoospermia undergoing in vitro fertilization]. Ginekol Pol 2001; 72:847-53. [PMID: 11848024] [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] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/23/2023] Open
Abstract
The karyotypic analysis was performed to assess the importance of genetic factor in male infertility. For that purpose, chromosomal analysis in blood lymphocytes was performed in 28 males, candidates for ICSI with azoospermia or severe oligozoospermia and in their spouses. Although chromosomal aberrations were identified in as many as 11 couples, (in 6 couples aberrations were identified in male, in 4 other couples in female partner, whereas in 1 one couple they were detected in both partners) their risk for potential offspring is unequal. Balanced autosomal aberrations detected in two males (7%) constitute a high risk since they can cause not only infertility but also severe somatic abnormalities if transferred as the unbalanced ones to the next generation. The remaining 9 chromosomal aberrations identified in this study were present in mosaic additional cell lines with low representation. In 8 of them sex chromosomes and in 1 an autosom were involved. Although these mosaic chromosomal aberrations can lower efficiency of in vitro fertilisation, the probability that they can be transferred to the next generation causing somatic abnormalities is not high. This study indicates that in case of azoospermia or severe oligozoospermia, the karyotypic analysis should be performed in both partners prior to in vitro fertilisation.
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Affiliation(s)
- A Wojda
- Zakład Genetyki Człowieka PAN, Poznań
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20
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Abstract
Mammalian somatic cells are usually diploid. Occasional rare human tumors have been shown to have a hypodiploid karyotype. We have isolated a near-haploid subclone (P1-55) from a heterogeneous human leukemia cell line, KBM-7. These near-haploid cells have approximately half the human diploid DNA content and have a haploid karyotype except for a disomy of chromosome 8 (25, XY, +8, Ph(+)). This cell line maintains a majority of cells with a near-haploid karyotype for at least 12 weeks in culture. By serial subcloning, we have isolated near-haploid subclones that maintain ploidy for at least 8 months in culture. Near-haploid cells can also be efficiently isolated from mixed ploidy cultures by size selection. The availability of this human near-haploid cell line should facilitate the genetic analysis of cultured human cells.
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Affiliation(s)
- M Kotecki
- Department of Physiology, Tufts University School of Medicine, 136 Harrison Avenue, Boston, Massachusetts, 02111, USA
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Kusz K, Kotecki M, Wojda A, Szarras-Czapnik M, Latos-Bielenska A, Warenik-Szymankiewicz A, Ruszczynska-Wolska A, Jaruzelska J. Incomplete masculinisation of XX subjects carrying the SRY gene on an inactive X chromosome. J Med Genet 1999. [DOI: 10.1136/jmg.36.6.452] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/04/2022]
Abstract
46,XX subjects carrying the testis determining SRY gene usually have a completely male phenotype. In this study, five very rare cases of SRY carrying subjects (two XX males and three XX true hermaphrodites) with various degrees of incomplete masculinisation were analysed in order to elucidate the cause of sexual ambiguity despite the presence of the SRY gene. PCR amplification of 20 Y chromosome specific sequences showed the Yp fragment to be much longer in XX males than in true hermaphrodites. FISH analysis combined with RBG banding of metaphase chromosomes of four patients showed that in all three true hermaphrodites and in one XX male the Yp fragment was translocated onto a late replicating inactive X chromosome in over 90% of their blood lymphocytes. However, in a control classical XX male with no ambiguous features, the Yp fragment (significantly shorter than in the XX male with sexual ambiguity and only slightly longer than in XX hermaphrodites) was translocated onto the active X chromosome in over 90% of cells.These studies strongly indicate that inactivation on the X chromosome spreading into a translocated Yp fragment could be the major mechanism causing a sexually ambiguous phenotype in XX (SRY+) subjects.
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Kusz K, Kotecki M, Wojda A, Szarras-Czapnik M, Latos-Bielenska A, Warenik-Szymankiewicz A, Ruszczynska-Wolska A, Jaruzelska J. Incomplete masculinisation of XX subjects carrying the SRY gene on an inactive X chromosome. J Med Genet 1999; 36:452-6. [PMID: 10874632 PMCID: PMC1734388] [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] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/16/2023]
Abstract
46,XX subjects carrying the testis determining SRY gene usually have a completely male phenotype. In this study, five very rare cases of SRY carrying subjects (two XX males and three XX true hermaphrodites) with various degrees of incomplete masculinisation were analysed in order to elucidate the cause of sexual ambiguity despite the presence of the SRY gene. PCR amplification of 20 Y chromosome specific sequences showed the Yp fragment to be much longer in XX males than in true hermaphrodites. FISH analysis combined with RBG banding of metaphase chromosomes of four patients showed that in all three true hermaphrodites and in one XX male the Yp fragment was translocated onto a late replicating inactive X chromosome in over 90% of their blood lymphocytes. However, in a control classical XX male with no ambiguous features, the Yp fragment (significantly shorter than in the XX male with sexual ambiguity and only slightly longer than in XX hermaphrodites) was translocated onto the active X chromosome in over 90% of cells. These studies strongly indicate that inactivation on the X chromosome spreading into a translocated Yp fragment could be the major mechanism causing a sexually ambiguous phenotype in XX (SRY+) subjects.
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Affiliation(s)
- K Kusz
- Institute of Human Genetics, Polish Academy of Sciences, Poznan, Poland
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Schöllnberger H, Kotecki M, Crawford-Brown D, Hofmann W, Eckl P. Adaptive response and dose-response plateaus for initiation in a state-vector model of carcinogenesis. Int J Radiat Biol 1999; 75:351-64. [PMID: 10203185 DOI: 10.1080/095530099140528] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.5] [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: 10/17/2022]
Abstract
PURPOSE To investigate whether it is possible to explain dose-response plateaus for in-vitro X-ray irradiation of different cell lines with radioprotective mechanisms such as radiologically induced expression of scavengers and repair enzymes. MATERIALS AND METHODS A biomathematical model was developed based on a previous state-vector model. New features of the model are a mathematical description of enhanced repair and radical scavenging as a result of irradiation. RESULTS The model produces a plateau in the dose-response for in-vitro tranformations between 0.5 and 1 Gy and for chromosome aberrations and it predicts an inverse-fractionation effect within a selected range of doses. CONCLUSIONS Adaptive response mechanisms within a state-vector model provide a coherent explanation of the dose-response characteristics for in-vitro transformations and chromosomal aberrations. These results suggest the need for new experimental studies described in the paper.
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Affiliation(s)
- H Schöllnberger
- Institute for Environmental Studies, University of North Carolina at Chapel Hill, 27599-1105, USA
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Abstract
DNAs of four individuals demonstrating abnormalities in sexual development and mosaic 45,XO/46,XY karyotypes with terminal deletions of Yq were studied using a number of Y-specific probes. The results of these analyses allowed us to map several known DNA fragments within deletion interval 6 in the following order: Ycen-pDP105B/52dA, 50f2E, Fr25-II/Fr15-II, 50f2C, 49f-Yqter (groups of fragments in undetermined order separated by diagonal lines).
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Affiliation(s)
- M Kotecki
- Institute of Human Genetics, Polish Academy of Sciences, Poznań, Poland
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Pawlak AL, Kotecki M, Ignatowicz R. Increased frequency of chromatid breaks in lymphocytes of heterozygotes of ataxia telangiectasia after in vitro treatment with caffeine. Mutat Res 1990; 230:197-204. [PMID: 2374556 DOI: 10.1016/0027-5107(90)90057-b] [Citation(s) in RCA: 7] [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: 12/31/2022]
Abstract
The frequencies of caffeine-induced chromosomal aberrations (CA), mainly chromatid (CdB) and chromosome (CB) breaks, were studied in lymphocyte cultures derived from 6 obligatory heterozygotes and 1 homozygote of ataxia telangiectasia (AT), and from 4 control adult healthy persons. Caffeine (CF, 1 mM) was added at the beginning of the culture. In control cultures exposed to CF the frequency of CB was 1.9% and of CdB 1.3%. In cells of the AT homozygote, the frequency of CdB was 6.8% in the absence and 8.7% in the presence of caffeine, the frequencies of CB being 3.4 and 10.9%, respectively. In AT heterozygous cells treated with CF, CdB increased 13-fold as compared to a less than 3-fold increase in control cells. Comparing the frequencies of CF-induced chromosomal lesions in control and AT heterozygous cells, potentiation factors (Pf) for the effect of 1 AT gene on cell sensitivity to CF (Pf [AT]) were 3.5 for CB, 6.6 for CdB and 5.5 for CA. These data demonstrate that lymphocytes of AT heterozygotes are significantly more sensitive to caffeine treatment in vitro in terms of increased frequency of CdB than normal cells, which may be useful for the diagnosis of carriers of this defective gene.
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Affiliation(s)
- A L Pawlak
- Institute of Human Genetics, Polish Academy of Sciences, Poznan
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