Publications by authors named "Helena Dias"

Introduction: It is estimated that most people undergoing bariatric surgery are women of reproductive age; nonetheless, its effects on pregnancy outcomes are not yet fully understood.

Methods: Retrospective observational study, conducted in a tertiary center in Portugal, included participants in two groups: (1) pregnant women with a history of bariatric surgery (n = 89) and (2) pregnant women with a BMI ≥ 35 kg/m2, without previous bariatric surgery (n = 176). Data was collected from the medical files.

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Evaluation of DNA methylation (DNAm) patterns is a promising tool for age estimation. The duplex droplet digital PCR (ddPCR) method has been recently investigated for DNAm evaluation, revealing to be a potential methodology for DNAm evaluation and molecular age estimation. In this study, we evaluated DNAm levels of CpGs located at the three age-associated genes ELOVL2, FHL2 and PDE4C using ddPCR to develop an age prediction model.

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DNA methylation (DNAm) evaluation has been investigated in various tissues and body fluids allowing the identification of many CpG markers with high correlations with chronological age, potentially useful for forensic analysis. We developed a duplex droplet digital PCR (ddPCR) assay to address methylation levels of ELOVL2 gene CpG sites. DNA samples obtained from peripheral blood of 56 healthy individuals (35 women, 21 men; aged 1-94 years old) were submitted to bisulfite conversion, followed by ddPCR analysis for a selected region of ELOVL2 and the reference gene C-LESSC1.

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Systemic sclerosis (SSc) is considered one of the most challenging and difficult to treat among rheumatic disorders, due to its severity, multiorgan manifestation and different outcomes. It manifests fibrosis in different organs, mostly in skin and lungs. The skin fibrosis expression is considered the first sign of the disease and usually it is followed by internal organ fibrosis.

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Many studies in the forensic field have reported that analysis of DNA methylation is the most reliable method of predicting age. In a previous study, 5 CpG sites located in ELOVL2, FHL2, KLF14, C1orf132 and TRIM59 genes were tested for age prediction purposes in blood, saliva and buccal swab samples from Korean individuals using a multiplex methylation SNaPshot assay. The main goals of the present study were i) to replicate the same multiplex SNaPshot assay in blood samples from Portuguese individuals, ii) to compare DNA methylation status between two different populations and iii) to address putative differences in the methylation status between blood from living and deceased individuals.

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Objectives: To investigate the association of polymorphisms in SLC6A4 and MAOA genes with overweight (including obesity).

Material And Methods: Young adults (n = 535) of Portuguese origin were genotyped for the SLC6A4 polymorphisms 5-HTTLPR and STin2 and a MAOA VNTR. BMI and body fat percentage were measured and a questionnaire was used to assess individual's sport practicing habits.

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Purpose: To determine the main causes of penetrating keratoplasty indications at "Hospital das Clínicas-UNICAMP" (January, 1999 to December, 2003).

Methods: A non-comparative, retrospective series of case studies. The authors reviewed the files of 857 patients who underwent penetrating keratoplasty at "Hospital das Clínicas-UNICAMP" between 1999-2003 and classified them into different categories according to diagnostic indication for surgery.

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