Video Experimental Relacionado
Updated: Jul 18, 2026

12:21
MicroRNA In situ Hybridization for Formalin Fixed Kidney Tissues
Published on: December 1, 2013
Un abundante ARNm regulado por andrógenos en el riñón de ratón
Cell
|June 1, 1979
Resumen
Los investigadores identificaron una proteína androgénica renal (KAP) regulada por la testosterona. Sus niveles de ARN mensajero (ARNm) son más altos en los machos y aumentan con la administración de testosterona en las hembras y los machos castrados.
Área de la Ciencia:
- Biología Molecular Biología Molecular
- Endocrinología Endocrinología.
- Genética La genética.
Sus antecedentes:
- Se identificó una proteína específica, la proteína androgénica renal (KAP), a través de la traducción in vitro del ARNm del riñón de ratón macho.
- La KAP se sintetiza en cantidades significativamente más bajas en los riñones de ratones hembras en comparación con los machos.
Objetivo del estudio:
- Para investigar la regulación de la síntesis de KAP y sus correspondientes niveles de ARNm en ratones.
- Para determinar el papel de las hormonas sexuales, específicamente la testosterona, en la regulación de la expresión de KAP.
- Explorar las bases genéticas de la inducibilidad de KAP y la especificidad tisular.
Principales métodos:
- La traducción in vitro del ARNm del riñón de ratón para identificar el KAP.
- Purificación de un fragmento de KAP cDNA para la hibridación de ácido nucleico.
- Cuantificación de los niveles de ARNm KAP en diferentes grupos de ratones (machos, hembras, machos castrados, ratones Tfm) utilizando la hibridación.
- Manipulación hormonal mediante la administración de testosterona a mujeres y varones castrados.
Principales resultados:
- Los ratones machos exhiben niveles significativamente más altos de ARNm KAP en comparación con las hembras y los machos castrados.
- La administración de testosterona induce los niveles de ARNm KAP a niveles masculinos normales en mujeres y hombres castrados.
- Los ratones feminizados testiculares (Tfm) muestran niveles reducidos de ARNm KAP y no responden a la inducción de testosterona.
- El ARNm KAP se encuentra predominantemente en el tejido renal, lo que sugiere una regulación específica del tejido.
Conclusiones:
- La expresión de KAP está bajo control hormonal, regulada principalmente por la testosterona.
- El gen que codifica KAP es probablemente un gen de una sola copia, útil para estudios genéticos.
- KAP sirve como una herramienta valiosa para investigar los factores genéticos que influyen en la expresión génica hormonalmente regulada y la especificidad tisular en ratones.
Videos de Conceptos Relacionados
MicroRNAs
MicroRNA (miRNA) are short, regulatory RNA transcribed from introns—non-coding regions of a gene—or intergenic regions—stretches of DNA present between genes. Several processing steps are required to form biologically active, mature miRNA. The initial transcript, called primary miRNA (pri-mRNA), base-pairs with itself forming a stem-loop structure. Within the nucleus, an endonuclease enzyme, called Drosha, shortens the stem-loop structure into hairpin-shaped pre-miRNA. After the pre-miRNA ends...
Chromatin Structure Regulates pre-mRNA Processing
In eukaryotic cells, nascent mRNA transcripts need to undergo many post-transcriptional modifications to reach the cell cytoplasm and translate into functional proteins. For a long time, transcription and pre-mRNA processing were considered two independent events that occur sequentially in the cell. However, it has now been well established that transcription and pre-mRNA processing are two simultaneous processes that are precisely regulated inside the cell.
The chromatin structure, especially...
The chromatin structure, especially...
mRNA Stability and Gene Expression
The structure and stability of mRNA molecules regulates gene expression, as mRNAs are a key step in the pathway from gene to protein. In eukaryotes, the half-life of mRNA varies from a few minutes up to several days. mRNA stability is essential in growth and development. The absence of the proteins regulating its stability, such as tristetraprolin in mice, can cause systemic issues, including bone marrow overgrowth, inflammation, and autoimmunity.
Cis-acting Elements involved in mRNA stability
Cis-acting Elements involved in mRNA stability
mRNA Stability and Gene Expression
The structure and stability of mRNA molecules regulates gene expression, as mRNAs are a key step in the pathway from gene to protein. In eukaryotes, the half-life of mRNA varies from a few minutes up to several days. mRNA stability is essential in growth and development. The absence of the proteins regulating its stability, such as tristetraprolin in mice, can cause systemic issues, including bone marrow overgrowth, inflammation, and autoimmunity.
Cis-acting Elements involved in mRNA stability
Cis-acting Elements involved in mRNA stability
MicroRNAs
MicroRNA (miRNA) are short, regulatory RNA transcribed from introns (non-coding regions of a gene) or intergenic regions (stretches of DNA present between genes). Several processing steps are required to form biologically active, mature miRNA. The initial transcript, called primary miRNA (pri-mRNA), base-pairs with itself, forming a stem-loop structure. Within the nucleus, an endonuclease enzyme, called Drosha, shortens the stem-loop structure into hairpin-shaped pre-miRNA. After the pre-miRNA...
Regulation of Expression at Multiple Steps
The gene expression in cells is regulated at different stages: (i) transcription, (ii) RNA processing, (iii) RNA localization, and (iv) translation. Transcriptional regulation is mediated by regulatory proteins such as transcription factors, activators, or repressors—these control gene expression by initiating or inhibiting the transcription of genes. Once a precursor or pre-mRNA is produced, it undergoes post-transcriptional modification, including 5' capping, splicing, and the addition of a...

