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Unlike mitosis, meiosis aims for genetic diversity in its creation of haploid gametes. Dividing germ cells first begin this process in prophase I, where each chromosome—replicated in S phase—is now composed of two sister chromatids (identical copies) joined centrally.
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In 1928, a German botanist Emil Heitz observed the moss nuclei with a DNA binding dye. He observed that while some chromatin regions decondense and spread out in the interphase nucleus, others do not. He termed them euchromatin and heterochromatin, respectively. He proposed that the heterochromatin regions reflect a functionally inactive state of the genome. It was later confirmed that heterochromatin is transcriptionally repressed, and euchromatin is transcriptionally active chromatin.
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Polytene chromosomes are giant interphase chromosomes with several DNA strands placed side by side. They were discovered in the year 1881 by Balbiani in salivary glands, intestine, muscles, malpighian tubules, and hypoderm of larvae Chironomus plumosus. Hence, these are also called "Salivary gland chromosomes." These are found in insects of the order Diptera and Collembola; in certain organs of mammals; and synergids, antipodes of flowering plants. Polytene chromosomes are also...
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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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Chromatin is the massive complex of DNA and proteins packaged inside the nucleus. The complexity of chromatin folding and how it is packaged inside the nucleus greatly influences  access to genetic information. Generally, the nucleus' periphery is considered transcriptionally repressive, while the cell's interior is considered a transcriptionally active area. 
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Crossing over is the exchange of genetic information between homologous chromosomes during prophase I of meiosis I. Genetic recombination gives rise to allelic diversity in the newly formed daughter cells. In humans, crossing over produces genetically distinct haploid egg and sperm cells that undergo fertilization to produce unique offspring. Before cell division starts, the germ cell’s chromosome(s) undergo duplication in the S phase of the cell cycle. As the cells enter prophase I,...
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Las asociaciones intercromosómicas entre los loci expresados alternativamente.

Charalampos G Spilianakis1, Maria D Lalioti, Terrence Town

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Resumen

Este estudio revela que los genes para las vías de las células T auxiliares 1 (T) y 2 (T) interactúan físicamente entre los cromosomas. Estas interacciones, reguladas por regiones específicas del ADN, pueden coordinar la expresión de genes inmunes.

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Área de la Ciencia:

  • Inmunología Inmunología.
  • Biología Molecular Biología Molecular
  • Genética La genética.

Sus antecedentes:

  • Las vías de las células T auxiliares 1 (T) y 2 (T) representan destinos distintos de las células T CD4+, cruciales para las respuestas inmunes.
  • Los genes de citoquinas para estas vías, como el interferón-gamma (IFN-gamma) e interleucina-4 (IL-4), se encuentran en diferentes cromosomas.

Objetivo del estudio:

  • Investigar las posibles interacciones físicas entre los genes de citoquinas en cromosomas separados que regulan la diferenciación celular T(H) 1 y T(H) 2.
  • Para aclarar el papel de la región de control del locus T(H) 2 (LCR) en la mediación de estas interacciones intercromosómicas.

Principales métodos:

  • Utilizó sitios hipersensibles de la DNasa I para identificar regiones reguladoras involucradas en las interacciones de la cromatina.
  • Interacciones intercromosómicas examinadas entre el promotor del gen IFN-gamma y las regiones reguladoras del locus de citoquinas T(H) 2.

Principales resultados:

  • Interacciones físicas e intercromosómicas demostradas entre el promotor del gen IFN-gamma (cromosoma 10) y las regiones reguladoras del locus de citoquinas T(H) 2 (cromosoma 11).
  • Se ha demostrado que T(H) 2 LCR regula en el desarrollo estas interacciones intercromosómicas.
  • Se observaron interacciones dinámicas específicas del tipo de célula, con un cambio de interacciones inter- a intracromosómicas tras la activación del gen.

Conclusiones:

  • Los genes eucariotas en cromosomas separados pueden asociarse físicamente en el núcleo.
  • Estas asociaciones físicas, particularmente las interacciones intercromosómicas, pueden desempeñar un papel funcional en la coordinación de la expresión génica para las vías inmunitarias.