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Urdánoz Casado, Amaya

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Urdánoz Casado

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Amaya

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Ciencias de la Salud

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0000-0002-6312-8330

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123923

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2020 - 20223
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Subject: Biomarkers ×

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Now showing 1 - 3 of 3
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    PublicationOpen Access
    Identificación de circRNAs como biomarcadores epigenéticos candidatos en la enfermedad de Alzheimer
    (2022) Urdánoz Casado, Amaya; Blanco Luquin, Idoia; Mendióroz Iriarte, Maite; Ciencias de la Salud; Osasun Zientziak; Gobierno de Navarra / Nafarroako Gobernua
    La enfermedad de Alzheimer (EA) es una enfermedad neurodegenerativa, crónica y, por el momento, irreversible que representa la primera causa de demencia relacionada con la edad. Su diagnóstico sigue siendo un reto. En los últimos años, se han identificado diferentes biomarcadores diagnósticos pero, debido a su coste o dificultad de acceso, se ha limitado su implantación de rutina en muchos centros sanitarios. Por ello se están investigando nuevos biomarcadores no invasivos en sangre, como los biomarcadores epigenéticos, entre los que se encuentran los RNAs circulares (circRNAs), una clase de RNAs no codificantes. El objetivo de esta tesis es identificar circRNAs con una expresión diferencial en la corteza entorrinal (CE) humana, una región cerebral especialmente vulnerable a la EA, en pacientes con EA respecto a controles.
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    PublicationOpen Access
    Telomere length correlates with subtelomeric DNA methylation in long-term mindfulness practitioners
    (Nature Research, 2020) Mendióroz Iriarte, Maite; Puebla Guedea, Marta; Montero Marín, Jesús; Urdánoz Casado, Amaya; Labarga Gutiérrez, Alberto; Ciencias de la Salud; Osasun Zientziak
    Mindfulness and meditation techniques have proven successful for the reduction of stress and improvement in general health. In addition, meditation is linked to longevity and longer telomere length, a proposed biomarker of human aging. Interestingly, DNA methylation changes have been described at specific subtelomeric regions in long-term meditators compared to controls. However, the molecular basis underlying these beneficial effects of meditation on human health still remains unclear. Here we show that DNA methylation levels, measured by the Infinium HumanMethylation450 BeadChip (Illumina) array, at specific subtelomeric regions containing GPR31 and SERPINB9 genes were associated with telomere length in long-term meditators with a strong statistical trend when correcting for multiple testing. Notably, age showed no association with telomere length in the group of long-term meditators. These results may suggest that long-term meditation could be related to epigenetic mechanisms, in particular gene-specific DNA methylation changes at distinct subtelomeric regions.
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    PublicationOpen Access
    Early epigenetic changes of Alzheimer's disease in the human hippocampus
    (2020) Blanco Luquin, Idoia; Acha Santamaría, Blanca; Urdánoz Casado, Amaya; Sánchez Ruiz de Gordoa, Javier; Vicuña-Urriza, Janire; Roldán, Miren; Labarga Gutiérrez, Alberto; Zelaya Huerta, María Victoria; Cabello, Carolina; Méndez López, Iván; Mendióroz Iriarte, Maite; Ciencias de la Salud; Osasun Zientziak; Sociología y Trabajo Social; Soziologia eta Gizarte Lana; Gobierno de Navarra / Nafarroako Gobernua
    The discovery of new biomarkers would be very valuable to improve the detection of early Alzheimer's disease (AD). DNA methylation marks may serve as epigenetic biomarkers of early AD. Here we identified epigenetic marks that are present in the human hippocampus from the earliest stages of AD. A previous methylome dataset of the human AD hippocampus was used to select a set of eight differentially methylated positions (DMPs) since early AD stages. Next, bisulphite pyrosequencing was performed in an expanded homogeneous cohort of 18 pure controls and 35 hippocampal samples with neuropathological changes of pure AD. Correlation between DNA methylation levels in DMPs and phospho-tau protein burden assessed by immunohistochemistry in the hippocampus was also determined. We found four DMPs showing higher levels of DNA methylation at early AD stages compared to controls, involving ELOVL2, GIT1/TP53I13 and the histone gene locus at chromosome 6. DNA methylation levels assessed by bisulphite pyrosequencing correlated with phospho-tau protein burden for ELOVL2 and HIST1H3E/HIST1H3 F genes. In this discovery study, a set of four epigenetic marks of early AD stages have been identified in the human hippocampus. It would be worth studying in-depth the specific pathways related to these epigenetic marks. These early alterations in DNA methylation in the AD hippocampus could be regarded as candidate biomarkers to be explored in future translational studies.