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The Central Dogma

The Central Dogma

pre-mRNA Processing

pre-mRNA Processing

In eukaryotic cells, transcripts made by RNA polymerase are modified and processed before exiting the nucleus. Unprocessed RNA is called precursor mRNA or pre-mRNA to distinguish it from mature mRNA.
Once about 20-40 ribonucleotides have been joined together by RNA polymerase, a group of enzymes adds a “cap” to the 5’ end of the growing transcript. In this process, a 5’ phosphate is replaced by modified guanosine that has a methyl group attached to it (7-Methyl...

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Unlike eukaryotes, bacteria use a single RNA Polymerase (RNAP) to transcribe all genes. The different subunits of bacterial RNAPhave distinct functions. The multisubunit structure of the bacterial RNAP helps the enzyme to maintain catalytic function, facilitate assembly, interact with DNA and RNA, and self-regulate its activity.
In most genes, the transcription site is a single base present upstream of the coding sequence. Though RNAP is a catalytically efficient enzyme, it does not recognize...

Leaky Scanning

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During most eukaryotic translation processes, the small 40S ribosome subunit scans an mRNA from its 5' end until it encounters the first start AUG codon. The large 60S ribosomal subunit then joins the smaller one to initiate protein synthesis. The location of the translation initiation is largely determined by the nucleotides near the start codon as there may be multiple translation initiation sites present on the mRNA. Marilyn Kozak discovered that the sequence RCCAUGG (where R...

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The Central Dogma

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The central dogma explains the flow of genetic information from DNA nucleotides to the amino acid sequence of proteins.
RNA is the Missing Link Between DNA and Proteins
In the early 1900s, scientists discovered that DNA stores all the information needed for cellular functions and that proteins perform most of these functions. However, the mechanisms of converting genetic information into functional proteins remained unknown for many years. Initially, it was believed that a single gene is...

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La secuencia primaria del ARNm alfa-globina de conejo.

H C Heindell, A Liu, G V Paddock

|September 1, 1978

Resumen

Los investigadores han secuenciado completamente el ARN mensajero alfa-globina del conejo (ARNm), confirmando su exactitud a través de la secuenciación de ARN complementario (ARNc). Esta secuencia detallada proporciona información sobre la expresión génica y la síntesis de proteínas.

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Área de la Ciencia:

Biología Molecular Biología Molecular
Genética La genética.
La bioquímica es la bioquímica.

Sus antecedentes:

El gen alfa-globina del conejo es crucial para la producción de hemoglobina.
La secuenciación precisa del ARN mensajero (ARNm) es esencial para comprender la expresión génica y la síntesis de proteínas.

Objetivo del estudio:

Para determinar la secuencia completa de nucleótidos del ARN mensajero alfa-globina de conejo (ARNm).
Para validar la precisión del ARNm secuenciado a través de la comparación con los datos existentes y la secuenciación de ARN complementario (ARNc).
Para analizar las características generales de la secuencia de ARNm, incluyendo la composición de las bases y las preferencias de los codones.

Principales métodos:

Secuenciación de ADN utilizando el método Maxam y Gilbert.
Análisis del plásmido quimérico pHb 72 que contiene la inserción de ADN alfa-globina de conejo.
Comparación de la secuencia de ARNm obtenida con datos publicados anteriormente para los extremos 5' y 3'.
Utilizando un nuevo programa informático para analizar los arreglos de emparejamiento de bases.

Principales resultados:

Se determinó la secuencia primaria completa del ARNm alfa-globina de conejo, que abarca la región 5' no traducida a través de los primeros 361 nucleótidos traducidos.
La secuencia determinada mostró un acuerdo completo con las secuencias superpuestas previamente reportadas.
Los resultados reafirmaron la alta fidelidad de las copias de genes sintetizadas in vitro, la clonación bacteriana y el mantenimiento.

Conclusiones:

Se ha establecido con alta fidelidad la secuencia completa de ARNm alfa-globina de conejo.
Los hallazgos apoyan la fiabilidad de la síntesis, la clonación y el mantenimiento de copias de genes in vitro.
El análisis de la secuencia proporciona datos valiosos para comprender la expresión génica, el uso del codón y la estructura del ARNm.