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Videos de Conceptos Relacionados

Epigenetic Regulation01:46

Epigenetic Regulation

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Epigenetic mechanisms play an essential role in healthy development. Conversely, precisely regulated epigenetic mechanisms are disrupted in diseases like cancer.
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Euchromatin01:01

Euchromatin

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The extent of chromatin compaction can be studied by staining chromatin using specific DNA binding dyes. Under the microscope, the dense-compacted regions take up more dye, appearing darker, while the less-compact areas take up less dye and appear lighter. Based on the compaction level, chromatins are classified into two primary forms – euchromatin and heterochromatin.
Euchromatin is the less dense region of the chromatin and stains lighter. Euchromatin contains histone H3 extensively...
7.0K
Heterochromatin02:38

Heterochromatin

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The extent of chromatin compaction can be studied by staining chromatin using specific DNA binding dyes. Under the microscope, the dense-compacted regions that take up more dye are called heterochromatin. Heterochromatin is further classified into two forms – constitutive heterochromatin and facultative heterochromatin.
Constitutive heterochromatin: It is a highly compact region of chromatin that is mostly concentrated in the centromere and telomere. Unlike euchromatin, the amino acid at...
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Genomic Imprinting and Inheritance02:30

Genomic Imprinting and Inheritance

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Diploid organisms inherit genetic material through chromosomes from both parents. Copies of the same gene are known as alleles. In most cases, both alleles are simultaneously expressed and allow various cellular processes to function optimally. If one of the alleles is missing or mutated, the expression of the other allele can compensate; however, this is not true for all genes.
The expression of some genes depends on which parent passed the gene to the offspring, through a phenomenon known as...
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Inheritance of Chromatin Structures03:17

Inheritance of Chromatin Structures

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Epigenetics is the study of inherited changes in a cell's phenotype without changing the DNA sequences. It provides a form of memory for the differential gene expression pattern to maintain cell lineage, position-effect variegation, dosage compensation, and maintenance of chromatin structures such as telomeres and centromeres. For example, the structure and location of the centromere on chromosomes are epigenetically inherited. Its functionality is not dictated or ensured by the underlying...
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Histone Modification02:32

Histone Modification

13.4K
The histone proteins have a flexible N-terminal tail extending out from the nucleosome. These histone tails are often subjected to post-translational modifications such as acetylation, methylation, phosphorylation, and ubiquitination. Particular combinations of these modifications form “histone codes” that influence the chromatin folding and tissue-specific gene expression.
Acetylation
The enzyme histone acetyltransferase adds acetyl group to the histones. Another enzyme, histone...
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Adenine DNA methylation associated with transcriptionally permissive chromatin is widespread across eukaryotes.

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Video Experimental Relacionado

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Immunostaining for DNA Modifications: Computational Analysis of Confocal Images
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Immunostaining for DNA Modifications: Computational Analysis of Confocal Images

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Un paisaje de metilación del ADN de los mamíferos

Alex de Mendoza1

  • 1School of Biological and Behavioural Sciences, Queen Mary University of London, London, UK.

Science (New York, N.Y.)
|August 10, 2023
PubMed
Resumen

Este estudio explora las diversas vidas de 348 especies de mamíferos. Los hallazgos arrojan luz sobre los factores evolutivos que influyen en la longevidad de los mamíferos.

Área de la Ciencia:

  • Zoología
  • Biología evolutiva

Sus antecedentes:

  • La duración de la vida de los mamíferos es muy variable.
  • Comprender esta diversidad es clave para comprender las adaptaciones evolutivas.

Objetivo del estudio:

  • Investigar los factores que contribuyen a la amplia gama de vidas de los mamíferos.
  • Para proporcionar información sobre las presiones evolutivas que dan forma a la longevidad.

Principales métodos:

  • Análisis de los datos de la esperanza de vida de 348 especies de mamíferos.
  • Análisis comparativo entre diferentes grupos de mamíferos.

Principales resultados:

  • Se observó una variación significativa en la esperanza de vida máxima y media.
  • Identificación de correlaciones potenciales entre la esperanza de vida y factores como el tamaño corporal y la tasa metabólica.

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Conclusiones:

  • La vida útil de los mamíferos es un rasgo complejo influenciado por múltiples factores evolutivos.
  • Investigaciones adicionales pueden aclarar los mecanismos específicos que impulsan la diversidad de la longevidad.