BUSCADOR RECOLECTA

Dades primàries associades a l'article publicat a BMC Pediatrics, vol. 17 [https://doi.org/10.1186/s12887-017-0816-x], Background: Young children bear the world’s highest prevalence of anaemia, the majority of which is of multifactorial aetiology, which in turn hampers its successful prevention. Even moderate degrees of anaemia are associated with increased mortality and morbidity. Despite this evidence, there is a lack of effective preventive programs and absence of consensus in the safety of iron supplementation in malaria areas, which reflects the poor understanding of the contribution of different aetiologies to anaemia. In order to reduce the anaemia burden in the most vulnerable population, a study to determine the aetiology of anaemia among pre-school Mozambican children was performed. Methods: We undertook a case-control study of 443 preschool hospitalized children with anaemia (haemoglobin concentration <11g/dl) and 289 community controls without anaemia. Inclusion criteria were: age 1-59 months, no blood transfusion in the previous month, residence in the study area and signed informed consent. Both univariable and multivariable logistic regression analyses were performed to identify factors associated with anaemia and adjusted attributable fractions (AAF) were estimated when appropriate. Results: Malaria (adjusted odds ratio (AOR)=8.39, p<0.0001; AAF=37%), underweight (AOR=8.10, p<0.0001; AAF=43%), prealbumin deficiency (AOR=7.11, p<0.0001; AAF=77%), albumin deficiency (AOR=4.29, p=0.0012; AAF=30%), HIV (AOR=5.73, p=0.0060; AAF=18%), and iron deficiency (AOR=4.05, p<0.0001; AAF=53%) were associated with anaemia. Vitamin A deficiency and α-thalassaemia were frequent (69% and 64%, respectively in cases) but not independently related to anaemia. Bacteraemia (odds ratio (OR)=8.49, p=0.004), Parvovirus-B19 (OR=6.05, p=0.017) and Epstein-Barr virus (OR=2.10, p=0.0015) infections were related to anaemia only in the unadjusted analysis. Neither vitamin B12 deficiency nor intestinal parasites were associated with anaemia. Folate deficiency was not observed. Conclusions: Undernutrition, iron deficiency, malaria, and HIV are main factors related to anaemia in hospitalised Mozambican preschool children. Effective programs and strategies for the prevention and management of these conditions need to be reinforced. Specifically, prevention of iron deficiency that accounted in this study for more than half of anaemia cases would have a high impact in reducing the burden of anaemia in children living under similar conditions. However this deficiency, a common preventable and treatable condition, remains neglected by the international public health community.

Provided datasets correspond to the supplementary material generated for Perez RF et al (2018)., Distinct chromatin signatures of DNA hypomethylation in aging and cancer. Raúl F, Pérez et al. (DOI: 10.1111/acel.12744), Cancer is an aging-associated disease but the underlying molecular links between these processes are still largely unknown. Gene promoters that become hypermethylated in aging and cancer share a common chromatin signature in ES cells. In addition, there is also global DNA hypomethylation in both processes. However, any similarities of the regions where this loss of DNA methylation occurs is currently not well characterized, nor is it known whether such regions also share a common chromatin signature in aging and cancer. To address this issue we analysed TCGA DNA methylation data from a total of 2,311 samples, including control and cancer cases from patients with breast, kidney, thyroid, skin, brain and lung tumors and healthy blood, and integrated the results with histone, chromatin state and transcription factor binding site data from the NIH Roadmap Epigenomics and ENCODE projects. We identified 98,857 CpG sites differentially methylated in aging, and 286,746 in cancer. Hyper- and hypomethylated changes in both processes each had a similar genomic distribution across tissues and displayed tissue-independent alterations. The identified hypermethylated regions in aging and cancer shared a similar bivalent chromatin signature. In contrast, hypomethylated DNA sequences occurred in very different chromatin contexts. DNA hypomethylated sequences were enriched at genomic regions marked with the activating histone posttranslational modification H3K4me1 in aging, whilst in cancer, loss of DNA methylation was primarily associated with the repressive H3K9me3 mark., Peer reviewed

Supplementary figures and supplementary data tables from MethylationEPIC arrays (Tejedor et al), plus a compiled dataset including raw methylation intensities, processed β-values and Phenotypic data from HumanMethylation450 arrays collected from datasets GSE63409, GSE49618, GSE88824 and GSE49031, and HumanMethylationEPIC arrays deposited in E-MTAB-6315 entry from ArrayExpress., Epigenetic regulation plays an important role in cellular development and differentiation. A detailed map of the DNA methylation dynamics that occur during cell differentiation would contribute to decipher the molecular networks governing cell fate commitment. In this study we used the most recent Illumina MethylationEPIC Beadchip platform to describe the genome-wide DNA methylation changes observed throughout hematopoietic maturation by analyzing multiple hematopoietic cell types at different developmental stages., Grants: European Commission: INFANTLEUKEMIA - GENOMIC, CELLULAR AND DEVELOPMENTAL RECONSTRUCTION OFINFANT MLL-AF4+ ACUTE LYMPHOBLASTIC LEUKEMIA (646903)., Peer reviewed