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1.
J Obstet Gynaecol Can ; 46(7): 102562, 2024 May 15.
Artigo em Inglês | MEDLINE | ID: mdl-38759792

RESUMO

OBJECTIVES: To characterise contemporary trends in the hormonal management of endometriosis in adolescent and young adult patients with biopsy-proven endometriosis. METHODS: Retrospective chart review of women aged 14-25 years who underwent laparoscopy for pelvic pain with biopsy-proven endometriosis between January 2011 and September 2020 at an academic tertiary hospital system. The final sample included 91 patients with biopsy-confirmed endometriosis. RESULTS: Combined oral contraceptives (COCs) were the most common initial treatment (64% of patients). Progestin-only formulations (low- and high-dose norethindrone acetate) were offered to younger patients (age 15.9 ± 2.7 years) than those offered COCs (19.9 ± 3.3 years) and levonorgestrel intrauterine devices (LNG-IUDs) (21.9 ± 1.7 years). Current treatments varied widely and included COCs (32%), LNG-IUDs (18%), oral progestins (low- and high-dose norethindrone, medroxyprogesterone) (14%), elagolix (9%), and leuprolide (8%). Oral adjuncts to LNG-IUD were common: usually low- or high-dose norethindrone (37% of patients with an LNG-IUD), but also included progesterone, COCs, and elagolix. CONCLUSIONS: Oral progestins, LNG-IUDs, and COCs were the mainstay of initial treatment. Subsequent treatments varied widely and included COCs, LNG-IUDs, oral progestins, elagolix, leuprolide, and combinations of these agents. We observed that most young women switched between therapies, suggesting that a personalised approach is often used to determine treatment plans among the wide range of options currently available. This study helps define the spectrum of treatment regimens for endometriosis in adolescent females.

2.
Reprod Biol Endocrinol ; 21(1): 19, 2023 Feb 04.
Artigo em Inglês | MEDLINE | ID: mdl-36739415

RESUMO

BACKGROUND: While anti-Müllerian hormone (AMH) predicts quantitative IVF outcomes such as oocyte yield, it is not certain whether AMH predicts markers of oocyte quality such as aneuploidy. METHODS: Retrospective case-control analysis of the SART-CORS database, 2014-2016, to determine whether anti-Müllerian hormone (AMH) predicts aneuploidy and live birth in IVF cycles utilizing preimplantation genetic testing for aneuploidy (PGT-A). RESULTS: Of 51,273 cycles utilizing PGT-A for all embryos, 10,878 cycles were included in the final analysis; of these, 2,100 cycles resulted in canceled transfer due to lack of normal embryos and 8,778 cycles resulted in primary FET. AMH levels of cycles with ≥ 1 euploid embryo were greater than those of cycles with no normal embryos, stratifying by number of embryos biopsied (1-2, 3-4, 5-6, and ≥ 7), P < 0.017 for each stratum. Adjusting for age and number of embryos biopsied, AMH was a significant independent predictor of ≥ 1 euploid embryo for all age groups: < 35 yrs (aOR 1.074; 95%CI 1.005-1.163), 35-37 years (aOR 1.085; 95%CI 1.018-1.165) and ≥ 38 years (aOR 1.055; 95%CI 1.020-1.093). In comparative model analysis, AMH was superior to age as a predictor of  ≥ 1 euploid embryo for age groups < 35 years and 35-37 years, but not  ≥ 38 years. Across all cycles, age (aOR 0.945, 95% CI 0.935-0.956) and number of embryos (aOR 1.144, 95%CI 1.127-1.162) were associated with live birth per transfer, but AMH was not (aOR 0.995, 95%CI 0.983-1.008). In the subset of cycles resulting in ≥ 1 euploid embryo for transfer, neither age nor AMH were associated with live birth. CONCLUSIONS: Adjusting for age and number of embryos biopsied, AMH independently predicted likelihood of obtaining ≥ 1 euploid embryo for transfer in IVF PGT-A cycles. However, neither age nor AMH were predictive of live birth once a euploid embryo was identified by PGT-A for transfer. This analysis suggests a predictive role of AMH for oocyte quality (aneuploidy risk), but not live birth per transfer once a euploid embryo is identified following PGT-A.


Assuntos
Hormônio Antimülleriano , Diagnóstico Pré-Implantação , Gravidez , Feminino , Humanos , Fertilização in vitro/métodos , Diagnóstico Pré-Implantação/métodos , Estudos Retrospectivos , Testes Genéticos/métodos , Aneuploidia , Blastocisto/patologia
3.
BMJ Open ; 12(6): e052043, 2022 06 17.
Artigo em Inglês | MEDLINE | ID: mdl-35715184

RESUMO

INTRODUCTION: Infertility is a common complication of endometriosis. While in vitro fertilisation-embryo transfer (IVF) successfully treats endometriosis-associated infertility, there is some evidence that pregnancy rates may be diminished in women seeing fertility treatment for endometriosis-associated infertility compared with other etiologies of infertility. The use of gonadotropin releasing hormone (GnRH) agonist prior to IVF has been suggested to improve success, however studies have been small and rarely reported live birth rates. Recent approval of an oral GnRH antagonist for endometriosis provides a novel option for women with endometriosis who are undergoing IVF. There have been no studies on the efficacy of GnRH antagonists for the treatment of endometriosis-related infertility. METHODS AND ANALYSIS: This study is a multicentre, prospective, randomised, double-blind, placebo-controlled trial to study the efficacy of GnRH antagonist pretreatment for women with endometriosis who are undergoing IVF. A total of 814 patients with endometriosis undergoing fertility treatment will be enrolled and randomised 1:1 into two groups: elagolix 200 mg two times per day or placebo for 8 weeks, prior to undergoing IVF. All participants will then undergo IVF treatment per local protocols. The primary outcome is live birth. Secondary outcomes include oocyte number, fertilisation rate, embryo morphology and implantation rates, as well as rates of known endometriosis-related obstetrical outcomes (pregnancy-induced hypertension, antepartum haemorrhage, caesarean delivery and preterm birth). ETHICS AND DISSEMINATION: The PREGnant trial was approved by the Institutional Review Board at Johns Hopkins University. Results will be published in a peer-reviewed journal. TRIAL REGISTRATION NUMBER: NCT04173169.


Assuntos
Endometriose , Infertilidade , Nascimento Prematuro , Endometriose/complicações , Endometriose/tratamento farmacológico , Feminino , Fertilização in vitro/métodos , Hormônio Liberador de Gonadotropina , Humanos , Recém-Nascido , Infertilidade/complicações , Estudos Multicêntricos como Assunto , Indução da Ovulação/métodos , Gravidez , Taxa de Gravidez , Estudos Prospectivos , Ensaios Clínicos Controlados Aleatórios como Assunto
4.
Mol Psychiatry ; 26(11): 6963-6974, 2021 11.
Artigo em Inglês | MEDLINE | ID: mdl-34035477

RESUMO

Premenstrual Dysphoric Disorder (PMDD) is characterized by debilitating mood symptoms in the luteal phase of the menstrual cycle. Prior studies of affected women have implicated a differential response to ovarian steroids. However, the molecular basis of these patients' differential response to hormone remains poorly understood. We performed transcriptomic analyses of lymphoblastoid cell lines (LCLs) derived from women with PMDD and asymptomatic controls cultured under untreated (steroid-free), estradiol-treated (E2), and progesterone-treated (P4) conditions. Weighted gene correlation network analysis (WGCNA) of transcriptomes identified four gene modules with significant diagnosis x hormone interactions, including one enriched for neuronal functions. Next, in a gene-level analysis comparing transcriptional response to hormone across diagnoses, a generalized linear model identified 1522 genes differentially responsive to E2 (E2-DRGs). Among the top 10 E2-DRGs was a physically interacting network (NUCB1, DST, GCC2, GOLGB1) involved in endoplasmic reticulum (ER)-Golgi function. qRT-PCR validation reproduced a diagnosis x E2 interaction (F(1,24)=7.01, p = 0.014) for NUCB1, a regulator of cellular Ca2+ and ER stress. Finally, we used a thapsigargin (Tg) challenge assay to test whether E2 induces differences in Ca2+ homeostasis and ER stress response in PMDD. PMDD LCLs had a 1.36-fold decrease in Tg-induced XBP1 splicing response compared to controls, and a 1.62-fold decreased response (p = 0.005), with a diagnosis x treatment interaction (F(3,33)=3.51, p = 0.026) in the E2-exposed condition. Altered hormone-dependent in cellular Ca2+ dynamics and ER stress may contribute to the pathophysiology of PMDD.


Assuntos
Transtorno Disfórico Pré-Menstrual , Estresse do Retículo Endoplasmático/genética , Estradiol/farmacologia , Feminino , Homeostase , Humanos , Transtorno Disfórico Pré-Menstrual/genética , Transtorno Disfórico Pré-Menstrual/metabolismo , Progesterona
5.
Transl Psychiatry ; 11(1): 206, 2021 04 08.
Artigo em Inglês | MEDLINE | ID: mdl-33833224

RESUMO

Substantial evidence suggests that circulating ovarian steroids modulate behavior differently in women with PMDD than in those without this condition. However, hormonal state-related abnormalities of neural functioning in PMDD remain to be better characterized. In addition, while altered neural function in PMDD likely co-exists with alterations in intrinsic cellular function, such a relationship has not been explored. Here, we investigated the effects of ovarian steroids on basal, resting regional cerebral blood flow (rCBF) in PMDD, and, in an exploratory analysis, we tested whether the rCBF findings were linked to the expression of ESC/E(Z) genes, which form an essential ovarian steroid-regulated gene-silencing complex. Resting rCBF was measured with oxygen-15 water PET (189 PET sessions in 43 healthy women and 20 women with PMDD) during three self-as-own-control conditions: GnRH agonist (Lupron)-induced ovarian suppression, estradiol add-back, and progesterone add-back. ESC/E(Z) gene expression data were obtained from RNA-sequencing of lymphoblastoid cell lines performed in a previous study and were examined in relation to hormone-induced changes in rCBF. In the rCBF PET data, there was a significant diagnosis-by-hormone interaction in the subgenual cingulate (PFDR = 0.05), an important neuroanatomical hub for regulating affective state. Whereas control women showed no hormonally-related changes in resting rCBF, those with PMDD showed decreased resting rCBF during both estradiol (P = 0.02) and progesterone (P = 0.0002) add-back conditions. In addition, in PMDD, ESC/E(Z) gene expression correlated with the change in resting rCBF between Lupron-alone and progesterone conditions (Pearson r = -0.807, P = 0.016). This work offers a formulation of PMDD that integrates behavioral, neural circuit, and cellular mechanisms, and may provide new targets for future therapeutic interventions.


Assuntos
Transtorno Disfórico Pré-Menstrual , Circulação Cerebrovascular , Estradiol , Feminino , Humanos , Progesterona , Esteroides
6.
Menopause ; 28(4): 369-383, 2021 01 15.
Artigo em Inglês | MEDLINE | ID: mdl-33470755

RESUMO

OBJECTIVE: We examined the short-term efficacies of three estrogen-like compounds under placebo-controlled conditions in women with perimenopause-related depression (PMD). METHODS: Women with PMD were randomized in a double-blind parallel design to one of four treatments: transdermal 17-beta estradiol (TE) (100 mcg/d); oral raloxifene (60 mg/d); a proprietary phytoestrogen compound, Rimostil (1,000 mg twice/d); or placebo for 8 weeks. The main outcome measures were the Center for Epidemiology Studies Depression Scale, 17-item Hamilton Rating Scale for Depression (HRSD), and the Beck Depression Inventory completed at each clinic visit. Secondary outcomes included a visual analogue self-rating completed at each clinic visit, and daily self-ratings of hot flush severity. Cognitive tests were performed at pretreatment baseline and at the end of the trial. In the primary analysis, we obtained four repeated measures in each woman in the four treatment arms. Analyses were done with SAS Version 9.4 software (SAS Institute, Inc, Cary, NC), using PROC MIXED (for mixed models). All models included the following four explanatory variables, regardless of whether they were statistically significant: 1) treatment group (TE, raloxifene, Rimostil, placebo); 2) week (W2, W4, W6, W8); 3) treatment group-by-week interaction; and 4) baseline value of the measure being analyzed. The inclusion of additional variables was evaluated individually for each outcome measure. RESULTS: Sixty-six women were randomized into the trial, four women dropped out of the trial, and 62 women were included in the final data analysis. No effect of treatment group was observed in either the Center for Epidemiology Studies Depression Scale (P = 0.34) or Beck Depression Inventory (P = 0.27) scores; however, there was a difference in HRSD scores between treatment groups (P = 0.0037) that pair-wise comparisons of the combined weekly scores in each treatment demonstrated TE's beneficial effects on HRSD scores compared with Rimostil (P = 0.0005), and less consistently with placebo (P = 0.099). The average (SD) of the baseline scores for each treatment group on the HRSD was as follows: TE-15.3 (4.5), raloxifene-16.0 (3.7), Rimostil-14.0 (2.7), and placebo-15.2 (3.0). Whereas the HRSD scores after 8 weeks of treatment (least-square means) were TE-5.2(1.1), raloxifene-5.8(1.2), Rimostil-11.2(1.4), and placebo-7.8(1.1). No differences were observed between raloxifene and either TE or placebo in any scale score. HRSD scores in women assigned to TE were improved compared with those on Rimostil during weeks 6 and 8 (P values = 0.0008, 0.0011, respectively). Cognitive testing at week 8 showed that none of the three active treatment groups performed better than placebo. CONCLUSIONS: This study did not identify significant therapeutic benefits of TE, Rimostil, or raloxifene compared with placebo in PMD. However, improvements in depression ratings were observed between TE compared with Rimostil. Thus, our findings do not support the role of ERbeta compounds in the treatment of PMD (and indeed could suggest a more important role of ERalpha).


Assuntos
Perimenopausa , Cloridrato de Raloxifeno , Depressão/tratamento farmacológico , Método Duplo-Cego , Estradiol , Estrogênios , Feminino , Humanos , Fitoestrógenos , Cloridrato de Raloxifeno/uso terapêutico , Resultado do Tratamento
7.
Maturitas ; 141: 1-8, 2020 Nov.
Artigo em Inglês | MEDLINE | ID: mdl-33036697

RESUMO

OBJECTIVE: Our study aims to investigate the differences in insomnia between Chinese and Western women during menopause to fill the gaps in the research on menopause in Chinese women, and to examine the premenopausal factors predictive of moderate to severe insomnia during menopause. STUDY DESIGN: This is a longitudinal cohort study conducted in an urban Chinese community with a total of 458 participants. MAIN OUTCOME MEASURES: Presence of insomnia symptoms (trouble falling asleep, waking up early); vasomotor symptoms; anxiety and depression assessed by the Hospital Anxiety and Depression Scale; and menopausal stages. RESULTS: Multivariable analysis showed that compared with that in premenopause, the prevalence of trouble falling asleep was significantly higher in menopausal transition (P = 0.029) and postmenopause (P < 0.001), and the prevalence of early-morning awakenings also significantly increased in menopausal transition (P = 0.003) and postmenopause (P = 0.011). In multivariable analysis anxiety (P = 0.022) and depression (P = 0.005) were independently and significantly positively associated with trouble falling asleep. Anxiety (P < 0.001), depression (P = 0.018), and levels of follicle stimulating hormone (P-0.031) were independently and significantly positively associated with trouble falling asleep. Women who experienced insomnia in premenopause had a significantly higher risk of moderate to severe insomnia in menopausal transition (P = 0.003) and postmenopause (P = 0.047) than those who did not. CONCLUSION: This study showed that the prevalence of sleep disturbance significantly increased during and after menopause. Women with anxiety and depression had a higher risk of insomnia. Difficulty in sleep initiation in the premenopausal period was a strong predictor of moderate to severe insomnia at menopausal transition and postmenopause.


Assuntos
Ansiedade/fisiopatologia , Depressão/fisiopatologia , Menopausa/psicologia , Distúrbios do Início e da Manutenção do Sono/epidemiologia , Sono , Adulto , Povo Asiático , China/epidemiologia , Estudos de Coortes , Feminino , Hormônio Foliculoestimulante/sangue , Humanos , Estudos Longitudinais , Menopausa/fisiologia , Pessoa de Meia-Idade , Perimenopausa , Pós-Menopausa , Pré-Menopausa , Prevalência , Fatores de Risco , Transtornos do Sono-Vigília
8.
Arch Womens Ment Health ; 23(3): 401-412, 2020 06.
Artigo em Inglês | MEDLINE | ID: mdl-31372757

RESUMO

Postpartum depression (PPD) is a common complication following delivery, though evidence-based treatment options are limited. This study explores the feasibility and efficacy of outpatient PPD treatment with transdermal estradiol (TE). In a pilot, double-blind, placebo-controlled trial, women with PPD were randomized to receive transdermal 17ß-estradiol (100 mcg/day) or placebo patch. Over 6 weeks, women completed weekly ratings on the Beck Depression Inventory (BDI), Edinburgh Postnatal Depression Scale (EPDS), and Hamilton Depression Scale (HAM-D). Primary outcome measures were treatment response (> 50% decrease from baseline BDI) and remission (BDI < 10) at 6 weeks, and secondary outcome measures included severity on all scales at weeks 3 and 6. Of 12 recruited women, 6 received TE and 6 received placebo. By week 6, 5 women receiving TE responded to treatment and 4 showed symptom remission, compared to 2 responders and 1 remitter in the placebo group. This difference was not significant (p = 0.24). In a mixed-model of BDI ratings, TE was associated with a 9.2 point decrease at 3 weeks (95%CI - 19.5 to + 1.0, p = 0.074) and a 10.5 point decrease at 6 weeks (95%CI - 21.0-0.0, p = 0.049) compared to placebo, though these differences did not survive multiple comparisons correction. Analogous effects were found for HAM-D but not EPDS scores. Interestingly, no significant difference in plasma estradiol levels existed between groups. We were unable to demonstrate a significant therapeutic benefit of TE compared with placebo in PPD. Although limited by under-recruitment and loss to follow-up, our results suggest TE is a feasible option for outpatient PPD management, with preliminary evidence (based on secondary outcomes) for efficacy. Therapeutic effects may be seen as early as 3 weeks and may not directly depend on peripheral measures of estradiol.


Assuntos
Depressão Pós-Parto/tratamento farmacológico , Estradiol/uso terapêutico , Estrogênios/uso terapêutico , Administração Cutânea , Adulto , Método Duplo-Cego , Feminino , Humanos , Pessoa de Meia-Idade , Projetos Piloto , Escalas de Graduação Psiquiátrica , Resultado do Tratamento
9.
Obstet Gynecol ; 134(4): 840-849, 2019 10.
Artigo em Inglês | MEDLINE | ID: mdl-31503167

RESUMO

OBJECTIVE: To evaluate the performance of cervical cancer screening algorithms for women living with human immunodeficiency virus (HIV), using primary high-risk human papillomavirus (HPV) testing followed by cytology, visual inspection with acetic acid, or colposcopy. METHODS: We conducted a prospective cohort study of women living with HIV in Botswana. All participants underwent high-risk HPV testing. Participants with positive high-risk HPV test results underwent cytology, visual inspection with acetic acid, colposcopy, and biopsy. Participants with negative high-risk HPV test results also underwent cytology. Histopathology was the reference standard for determination of preinvasive cervical disease and cervical cancer. Sensitivity, specificity, positive predictive value (PPV), negative predictive value, and likelihood ratios (LR) of high-risk HPV-based two-stage screening algorithms were calculated. RESULTS: Among 300 women screened, 88 (29%) had a positive high-risk HPV test result, and 29 of the 88 (35%) women who tested positive for high-risk HPV had CIN 2 or higher on histopathology. High-risk HPV followed by colposcopy resulted in a sensitivity of 83%, specificity of 49%, PPV of 47%, LR+ of +1.6, and LR- of -0.4. High-risk HPV followed by visual inspection with acetic acid resulted in a reduced sensitivity of 59%, specificity of 49%, PPV of 39%, LR+ of +1.2, and LR- of -0.8. High-risk HPV testing followed by cytology also resulted in a reduced sensitivity of 62%, specificity of 77%, PPV of 60%, LR+ of +2.7, and LR- of -0.5. Stratification by HPV 16/18/45 did not improve performance of the algorithms. CONCLUSION: In a high-risk population with HIV, high-risk HPV testing followed by colposcopy demonstrated the highest sensitivity and PPV in detecting high-grade cervical dysplasia. Allocating resources to colposcopy in resource-limited settings may be more effective than other screening strategies.


Assuntos
Infecções por HIV/complicações , Papillomavirus Humano 16/isolamento & purificação , Papillomavirus Humano 18/isolamento & purificação , Neoplasias do Colo do Útero/diagnóstico , Adulto , Feminino , Humanos , Pessoa de Meia-Idade , Estudos Prospectivos , Neoplasias do Colo do Útero/virologia
10.
BMC Nephrol ; 20(1): 353, 2019 09 09.
Artigo em Inglês | MEDLINE | ID: mdl-31500578

RESUMO

BACKGROUND: 17q12 deletion syndrome encompasses a broad constellation of clinical phenotypes, including renal magnesium wasting, maturity-onset diabetes of the young (MODY), renal cysts, genitourinary malformations, and neuropsychiatric illness. Manifestations outside of the renal, endocrine, and nervous systems have not been well described. CASE PRESENTATION: We report a 62-year-old male referred to the Undiagnosed Diseases Program (UDP) at the National Institutes of Health (NIH) who presented with persistent hypermagnesiuric hypomagnesemia and was found to have a 17q12 deletion. The patient exhibited several known manifestations of the syndrome, including severe hypomagnesemia, renal cysts, diabetes and cognitive deficits. Coronary CT revealed extensive coronary calcifications, with a coronary artery calcification score of 12,427. Vascular calcifications have not been previously reported in this condition. We describe several physiologic mechanisms and a review of literature to support the expansion of the 17q12 deletion syndrome to include vascular calcification. CONCLUSION: Extensive coronary and vascular calcifications may be an extension of the 17q12 deletion phenotype, particularly if hypomagnesemia and hyperparathyroidism are prevalent. In patients with 17q12 deletions involving HNF1B, hyperparathyroidism and hypomagnesemia may contribute to significant cardiovascular risk.


Assuntos
Doença das Coronárias/genética , Fator 1-beta Nuclear de Hepatócito/genética , Erros Inatos do Transporte Tubular Renal/genética , Síndrome de Smith-Magenis/genética , Deleção Cromossômica , Cromossomos Humanos Par 17/genética , Doença das Coronárias/complicações , Doença das Coronárias/diagnóstico por imagem , Humanos , Masculino , Pessoa de Meia-Idade , Erros Inatos do Transporte Tubular Renal/complicações , Erros Inatos do Transporte Tubular Renal/diagnóstico por imagem , Síndrome de Smith-Magenis/complicações , Síndrome de Smith-Magenis/diagnóstico por imagem
11.
Sci Rep ; 5: 16025, 2015 Nov 04.
Artigo em Inglês | MEDLINE | ID: mdl-26531810

RESUMO

Mathematical models of metabolism from bacterial systems biology have proven their utility across multiple fields, for example metabolic engineering, growth phenotype simulation, and biological discovery. The usefulness of the models stems from their ability to compute a link between genotype and phenotype, but their ability to accurately simulate gene-gene interactions has not been investigated extensively. Here we assess how accurately a metabolic model for Escherichia coli computes one particular type of gene-gene interaction, synthetic lethality, and find that the accuracy rate is between 25% and 43%. The most common failure modes were incorrect computation of single gene essentiality and biological information that was missing from the model. Moreover, we performed virtual and biological screening against several synthetic lethal pairs to explore whether two-compound formulations could be found that inhibit the growth of Gram-negative bacteria. One set of molecules was identified that, depending on the concentrations, inhibits E. coli and S. enterica serovar Typhimurium in an additive or antagonistic manner. These findings pinpoint specific ways in which to improve the predictive ability of metabolic models, and highlight one potential application of systems biology to drug discovery and translational medicine.


Assuntos
Antibacterianos/farmacologia , Escherichia coli O157/genética , Genes Letais/genética , Klebsiella pneumoniae/genética , Salmonella typhimurium/genética , Biologia de Sistemas/métodos , Yersinia pestis/genética , Antibacterianos/síntese química , Combinação de Medicamentos , Descoberta de Drogas , Escherichia coli O157/crescimento & desenvolvimento , Escherichia coli O157/metabolismo , Doenças Transmitidas por Alimentos/microbiologia , Klebsiella pneumoniae/crescimento & desenvolvimento , Klebsiella pneumoniae/metabolismo , Testes de Sensibilidade Microbiana , Modelos Biológicos , Modelos Teóricos , Salmonella typhimurium/crescimento & desenvolvimento , Salmonella typhimurium/metabolismo , Yersinia pestis/crescimento & desenvolvimento , Yersinia pestis/metabolismo
12.
Proc Natl Acad Sci U S A ; 112(34): 10810-5, 2015 Aug 25.
Artigo em Inglês | MEDLINE | ID: mdl-26261351

RESUMO

Finding the minimal set of gene functions needed to sustain life is of both fundamental and practical importance. Minimal gene lists have been proposed by using comparative genomics-based core proteome definitions. A definition of a core proteome that is supported by empirical data, is understood at the systems-level, and provides a basis for computing essential cell functions is lacking. Here, we use a systems biology-based genome-scale model of metabolism and expression to define a functional core proteome consisting of 356 gene products, accounting for 44% of the Escherichia coli proteome by mass based on proteomics data. This systems biology core proteome includes 212 genes not found in previous comparative genomics-based core proteome definitions, accounts for 65% of known essential genes in E. coli, and has 78% gene function overlap with minimal genomes (Buchnera aphidicola and Mycoplasma genitalium). Based on transcriptomics data across environmental and genetic backgrounds, the systems biology core proteome is significantly enriched in nondifferentially expressed genes and depleted in differentially expressed genes. Compared with the noncore, core gene expression levels are also similar across genetic backgrounds (two times higher Spearman rank correlation) and exhibit significantly more complex transcriptional and posttranscriptional regulatory features (40% more transcription start sites per gene, 22% longer 5'UTR). Thus, genome-scale systems biology approaches rigorously identify a functional core proteome needed to support growth. This framework, validated by using high-throughput datasets, facilitates a mechanistic understanding of systems-level core proteome function through in silico models; it de facto defines a paleome.


Assuntos
Regulação Bacteriana da Expressão Gênica , Genes Bacterianos , Ensaios de Triagem em Larga Escala , Metaboloma , Proteoma , Biologia de Sistemas , Buchnera/genética , Buchnera/metabolismo , Simulação por Computador , Conjuntos de Dados como Assunto , Escherichia coli/genética , Escherichia coli/metabolismo , Proteínas de Escherichia coli/genética , Modelos Biológicos , Família Multigênica , Mycoplasma genitalium/genética , Mycoplasma genitalium/metabolismo , Transcriptoma
13.
Genome Announc ; 2(4)2014 Aug 14.
Artigo em Inglês | MEDLINE | ID: mdl-25125650

RESUMO

Escherichia coli EDL933 is the prototypic strain for enterohemorrhagic E. coli serotype O157:H7, associated with deadly food-borne outbreaks. Because the publicly available sequence of the EDL933 genome has gaps and >6,000 ambiguous base calls, we here present an updated high-quality, unambiguous genome sequence with no assembly gaps.

14.
PLoS One ; 7(3): e33727, 2012.
Artigo em Inglês | MEDLINE | ID: mdl-22470465

RESUMO

Adaptation is normally viewed as the enemy of the antibiotic discovery and development process because adaptation among pathogens to antibiotic exposure leads to resistance. We present a method here that, in contrast, exploits the power of adaptation among antibiotic producers to accelerate the discovery of antibiotics. A competition-based adaptive laboratory evolution scheme is presented whereby an antibiotic-producing microorganism is competed against a target pathogen and serially passed over time until the producer evolves the ability to synthesize a chemical entity that inhibits growth of the pathogen. When multiple Streptomyces clavuligerus replicates were adaptively evolved against methicillin-resistant Staphylococcus aureus N315 in this manner, a strain emerged that acquired the ability to constitutively produce holomycin. In contrast, no holomycin could be detected from the unevolved wild-type strain. Moreover, genome re-sequencing revealed that the evolved strain had lost pSCL4, a large 1.8 Mbp plasmid, and acquired several single nucleotide polymorphisms in genes that have been shown to affect secondary metabolite biosynthesis. These results demonstrate that competition-based adaptive laboratory evolution can constitute a platform to create mutants that overproduce known antibiotics and possibly to discover new compounds as well.


Assuntos
Antibacterianos/biossíntese , Evolução Biológica , Lactamas/metabolismo , Streptomyces/metabolismo , Proteínas de Bactérias/genética , Proteínas de Bactérias/metabolismo , Farmacorresistência Bacteriana , Genoma Bacteriano , Lactamas/química , Staphylococcus aureus Resistente à Meticilina/metabolismo , Plasmídeos/genética , Plasmídeos/metabolismo , Polimorfismo de Nucleotídeo Único , Streptomyces/genética
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