排序方式: 共有120条查询结果,搜索用时 156 毫秒
11.
12.
Ribas GS Biancini GB Mescka C Wayhs CY Sitta A Wajner M Vargas CR 《Cellular and molecular neurobiology》2012,32(1):77-82
Propionic (PA) and methylmalonic (MMA) acidurias are inherited disorders caused by deficiency of propionyl-CoA carboxylase
and methylmalonyl-CoA mutase, respectively. Affected patients present acute metabolic crises in the neonatal period and long-term
neurological deficits. Treatments of these diseases include a protein restricted diet and l-carnitine supplementation. l-Carnitine is widely used in the therapy of these diseases to prevent secondary l-carnitine deficiency and promote detoxification, and several recent in vitro and in vivo studies have reported antioxidant
and antiperoxidative effects of this compound. In this study, we evaluated the oxidative stress parameters, isoprostane and
di-tyrosine levels, and the antioxidant capacity, in urine from patients with PA and MMA at the diagnosis, and during treatment
with l-carnitine and protein-restricted diet. We verified a significant increase of isoprostanes and di-tyrosine, as well as a significant
reduction of the antioxidant capacity in urine from these patients at diagnosis, as compared to controls. Furthermore, treated
patients presented a marked reduction of isoprostanes and di-tyrosine levels in relation to untreated patients. In addition,
patients with higher levels of protein and lipid oxidative damage, determined by di-tyrosine and isoprostanes levels, also
presented lower urinary concentrations of total and free l-carnitine. In conclusion, the present results indicate that treatment with low protein diet and l-carnitine significantly reduces urinary biomarkers of protein and lipid oxidative damage in patients with disorders of propionate
metabolism and that l-carnitine supplementation may be specially involved in this protection. 相似文献
13.
Zhiyun Gong Yufeng Wu Andrea Koblí?ková Giovana A. Torres Kai Wang Marina Iovene Pavel Neumann Wenli Zhang Petr Novák C. Robin Buell Ji?í Macas Jiming Jiang 《The Plant cell》2012,24(9):3559-3574
Centromeres in most higher eukaryotes are composed of long arrays of satellite repeats. By contrast, most newly formed centromeres (neocentromeres) do not contain satellite repeats and instead include DNA sequences representative of the genome. An unknown question in centromere evolution is how satellite repeat-based centromeres evolve from neocentromeres. We conducted a genome-wide characterization of sequences associated with CENH3 nucleosomes in potato (Solanum tuberosum). Five potato centromeres (Cen4, Cen6, Cen10, Cen11, and Cen12) consisted primarily of single- or low-copy DNA sequences. No satellite repeats were identified in these five centromeres. At least one transcribed gene was associated with CENH3 nucleosomes. Thus, these five centromeres structurally resemble neocentromeres. By contrast, six potato centromeres (Cen1, Cen2, Cen3, Cen5, Cen7, and Cen8) contained megabase-sized satellite repeat arrays that are unique to individual centromeres. The satellite repeat arrays likely span the entire functional cores of these six centromeres. At least four of the centromeric repeats were amplified from retrotransposon-related sequences and were not detected in Solanum species closely related to potato. The presence of two distinct types of centromeres, coupled with the boom-and-bust cycles of centromeric satellite repeats in Solanum species, suggests that repeat-based centromeres can rapidly evolve from neocentromeres by de novo amplification and insertion of satellite repeats in the CENH3 domains. 相似文献
14.
Takehiko Shimizu Bao Ho Kathleen Deeley Jessica Brise?o-Ruiz Italo M. Faraco Jr Brett I. Schupack Jo?o A. Brancher Giovana D. Pecharki Erika C. Küchler Patricia N. Tannure Andrea Lips Thays C. S. Vieira Asli Patir Mine Yildirim Fernando A. Poletta Juan C. Mereb Judith M. Resick Carla A. Brandon Iêda M. Orioli Eduardo E. Castilla Mary L. Marazita Figen Seymen Marcelo C. Costa José M. Granjeiro Paula C. Trevilatto Alexandre R. Vieira 《PloS one》2012,7(9)
There is evidence for a genetic component in caries susceptibility, and studies in humans have suggested that variation in enamel formation genes may contribute to caries. For the present study, we used DNA samples collected from 1,831 individuals from various population data sets. Single nucleotide polymorphism markers were genotyped in selected genes (ameloblastin, amelogenin, enamelin, tuftelin, and tuftelin interacting protein 11) that influence enamel formation. Allele and genotype frequencies were compared between groups with distinct caries experience. Associations with caries experience can be detected but they are not necessarily replicated in all population groups and the most expressive results was for a marker in AMELX (p = 0.0007). To help interpret these results, we evaluated if enamel microhardness changes under simulated cariogenic challenges are associated with genetic variations in these same genes. After creating an artificial caries lesion, associations could be seen between genetic variation in TUFT1 (p = 0.006) and TUIP11 (p = 0.0006) with enamel microhardness. Our results suggest that the influence of genetic variation of enamel formation genes may influence the dynamic interactions between the enamel surface and the oral cavity. 相似文献
15.
Allelopathic effects of the Baltic cyanobacteria Nodularia spumdigena, Aphanizomenon flos-aquae and Anabaena lemmermannii on algal monocultures 总被引:1,自引:0,他引:1
Sanna Suikkanen Giovana O. Fistarol 《Journal of experimental marine biology and ecology》2004,308(1):85-101
Allelopathy, the release of extracellular compounds that inhibit the growth of other microorganisms, may be one factor contributing to the formation and/or maintenance of cyanobacterial blooms. We investigated the allelopathic effects of three cyanobacterial species (Nodularia spumigena, Aphanizomenon flos-aquae and Anabaena lemmermannii) that frequently form mass-occurrences in the Baltic Sea. We exposed monocultures of three phytoplankton species (Thalassiosira weissflogii, Rhodomonas sp. and Prymnesium parvum) to cell-free filtrates of the three cyanobacteria, and quantified allelopathic effects with cell counts. We also investigated the role of the growth phase of cyanobacteria in their allelopathy, by comparing the effects of an exponential and a stationary phase culture of N. spumigena. All tested cyanobacteria inhibited the growth of Rhodomonas sp., but none of them affected P. parvum. The effects on T. weissflogii were more variable, and they were amplified by repeated filtrate additions compared to a single filtrate addition. N. spumigena was more allelopathic in exponential than in stationary growth phase, whereas the culture filtrate was more hepatotoxic in stationary phase. Hepatotoxins were thus probably not involved in the allelopathic effects, which is also indicated by the allelopathic properties of the non-toxic A. flos-aquae and A. lemmermannii. The results demonstrate that the common Baltic cyanobacteria affect some coexisting phytoplankton species negatively. Allelopathy may therefore play a role in interspecific competition and contribute to cyanobacterial bloom maintenance. 相似文献
16.
Alisson L. da Rocha Giovana R. Teixeira Ana P. Pinto Gustavo P. de Morais Luciana da C. Oliveira Larissa Gaioto de Vicente Lilian E. C. M. da Silva José R. Pauli Dennys E. Cintra Eduardo R. Ropelle Leandro P. de Moura Rania A. Mekary Ellen C. de Freitas Adelino S. R. da Silva 《Journal of cellular physiology》2018,233(11):8850-8861
17.
Giovana Duarte Viana Rodrigues João Paulo Felix Augusto de Almeida Tamí Mott 《Studies on Neotropical Fauna and Environment》2017,52(3):204-215
Herein, we provide external and internal morphological data of Scinax skuki tadpoles from its type locality. The benthic tadpole of S. skuki has eyes and nostrils positioned dorsally, vent tube dextral and reaching the free margin of the ventral fin, oral disk ventral with posterior margin concave when partially closed, labial tooth row formula 2/3, and the presence of nonpigmented spurs behind the lower jaw. These characters, together with the absence of a tectum parietale, and the shapes of the pars articularis quadrati and suprarostral, are useful for species identification and may be informative for systematic purposes. 相似文献
18.
Di Marco GS Alam A Dol F Corvol P Gasc JM Larger E 《Molecular medicine (Cambridge, Mass.)》2008,14(11-12):705-714
Hyperglycemia induces defects in angiogenesis without alteration in the expression of major vascular growth factors in the chicken chorioallantoic membrane (CAM) model. A direct negative effect of hyperglycemia on angiogenesis may participate in failures of "therapeutic angiogenesis" trials. Here, we tested the hypothesis that the response to pro-angiogenic molecules such as angiotensin-converting enzyme (ACE), endothelin-1 (ET-1), and vascular endothelial growth factor-A (VEGF) is altered by hyperglycemia. Transfected (Chinese hamster ovary [CHO] or human embryonic kidney [HEK]) cells overexpressing ACE, ET-1, or VEGF were deposed onto the CAM of hyperglycemic or control embryos. The proangiogenic effect was evaluated 3 d later by angiography and histological analyses. Gene expression in response to these factors was assessed by in situ hybridization. Only VEGF overexpression evoked a proangiogenic response in the CAM from hyperglycemic embryos, upregulating the expression of endogenous VEGF, VEGF-R2, and Tie-2, all of them related to activation of endothelial cells. In conclusion, in a model where hyperglycemia does not alter the major vascular growth factor expression, the negative effect of diabetes on capillary density was overcome only by VEGF overexpression, whereas responses to other vasoactive peptides were practically abolished under hyperglycemic conditions. 相似文献
19.
SNUFER is a software for the automatic localization and generation of tables used for the presentation of single nucleotide
polymorphisms (SNPs). After input of a fasta file containing the sequences to be analyzed, a multiple sequence alignment is
generated using ClustalW ran inside SNUFER. The ClustalW output file is then used to generate a table which displays the
SNPs detected in the aligned sequences and their degree of similarity. This table can be exported to Microsoft Word,
Microsoft Excel or as a single text file, permitting further editing for publication. The software was written using Delphi
7 for programming and FireBird 2.0 for sequence database management. It is freely available for noncommercial use and can be
downloaded from
http://www.heranza.com.br/bioinformatica2.htm. 相似文献
20.
Palmero EI Caleffi M Schüler-Faccini L Roth FL Kalakun L Netto CB Skonieski G Giacomazzi J Weber B Giugliani R Camey SA Ashton-Prolla P 《Genetics and molecular biology》2009,32(3):447-455
In 2004, a population-based cohort (the Núcleo Mama Porto Alegre - NMPOA Cohort) was started in Porto Alegre, southern Brazil and within that cohort, a hereditary breast cancer study was initiated, aiming to determine the prevalence of hereditary breast cancer phenotypes and evaluate acceptance of a genetic cancer risk assessment (GCRA) program. Women from that cohort who reported a positive family history of cancer were referred to GCRA. Of the 9218 women enrolled, 1286 (13.9%) reported a family history of cancer. Of the 902 women who attended GCRA, 55 (8%) had an estimated lifetime risk of breast cancer ≥ 20% and 214 (23.7%) had pedigrees suggestive of a breast cancer predisposition syndrome; an unexpectedly high number of these fulfilled criteria for Li-Fraumeni-like syndrome (122 families, 66.7%). The overall prevalence of a hereditary breast cancer phenotype was 6.2% (95%CI: 5.67-6.65). These findings identified a problem of significant magnitude in the region and indicate that genetic cancer risk evaluation should be undertaken in a considerable proportion of the women from this community. The large proportion of women who attended GCRA (72.3%) indicates that the program was well-accepted by the community, regardless of the potential cultural, economic and social barriers. 相似文献