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Conserved Binding Sites01:49

Conserved Binding Sites

Many proteins’ biological role depends on their interactions with their ligands, small molecules that bind to specific locations on the protein known as ligand-binding sites. Ligand-binding sites are often conserved among homologous proteins as these sites are critical for protein function.
Binding sites are often located in large pockets, and if their location on a protein’s surface is unknown, it can be predicted using various approaches. The energetic method computationally analyses the...
Genome Copying Errors02:46

Genome Copying Errors

DNA replication is a well-evolved process that copies millions of base pairs with high fidelity during each cell division. Occasionally a wrong base or a long stretch of wrong bases may get added to the daughter strands. If the errors are left unchecked, cells might accumulate several mutations that might endanger their  survival. Therefore, the copying errors are checked and repaired at three levels.
Multi-species Conserved Sequences02:51

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Next-generation sequencing technologies have created large genomic databases of a variety of animals and plants. Ever since the human genome project was completed, scientists studied the genome of primates, mammals, and other phylogenetically distant living beings. Such large-scale  studies have provided new insights into the evolutionary relationship between organisms.
Although the genome of each species varies greatly from each other, a few sequences are highly conserved. Such conserved DNA...
Conserved Binding Sites01:49

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Within the human body, a complex and detailed system of trillions of cells works in unison to sustain life. Each cell houses a nucleus, which contains 46 chromosomes divided into 23 pairs. Chromosomes are highly coiled structures made of the genetic material DNA. These chromosomes are essential carriers of genetic information, with half inherited from the mother through her egg and the other half from the father's sperm, combining to create the unique genetic makeup of an individual.

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Screening for Functional Non-coding Genetic Variants Using Electrophoretic Mobility Shift Assay (EMSA) and DNA-affinity Precipitation Assay (DAPA)
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Elementos ultraconservados en el genoma humano.

Gill Bejerano1, Michael Pheasant, Igor Makunin

  • 1Department of Biomolecular Engineering, University of California Santa Cruz, Santa Cruz, CA 95064, USA. jill@soe.ucsc.edu

Science (New York, N.Y.)
|May 8, 2004
PubMed
Resumen

Los investigadores identificaron 481 elementos ultraconservados (UCE) en el genoma humano, mostrando una alta conservación en mamíferos y vertebrados. Estas UCE son cruciales para el desarrollo y pueden ser esenciales para la ontogenia de los vertebrados.

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Área de la Ciencia:

  • La genómica es la genómica.
  • La genómica comparada es una genómica comparada.
  • Biología evolutiva Biología evolutiva.

Sus antecedentes:

  • Los elementos ultraconservados (UCE) son secuencias de ADN altamente conservadas en todas las especies.
  • Comprender las UCE es crucial para descifrar la evolución y la función del genoma.

Objetivo del estudio:

  • Identificar y caracterizar los elementos ultraconservados (UCE) en el genoma humano.
  • Investigar los patrones de conservación de estos elementos en diferentes especies de vertebrados.
  • Explorar las ubicaciones genómicas y las funciones potenciales de las UCE.

Principales métodos:

  • Análisis genómico comparativo de los genomas de humanos, ratas, ratones, pollos, perros y peces.
  • Identificación de segmentos de ADN con 100% de identidad en todas las regiones ortológicas.
  • Análisis de la ubicación de la UCE en relación con los genes involucrados en el procesamiento, transcripción y desarrollo del ARN.

Principales resultados:

  • Se identificaron 481 segmentos >200 pares de bases (bp) con 100% de identidad en los genomas de humanos, ratas y ratones.
  • Estos segmentos muestran una alta conservación (95-99% de identidad) en pollos y perros, y una conservación significativa en peces.
  • Las UCE se localizan con frecuencia cerca de los genes involucrados en el procesamiento del ARN, la regulación de la transcripción y el desarrollo.

Conclusiones:

  • Las UCE representan una nueva clase de elementos genéticos altamente conservados en los vertebrados.
  • Sus niveles de conservación exceden los de las proteínas, lo que sugiere funciones funcionales críticas.
  • Es probable que las UCE sean esenciales para la ontogenia de los mamíferos y otros vertebrados, aunque sus funciones precisas y sus orígenes evolutivos requieren más investigación.