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What is Gene Expression?01:42

What is Gene Expression?

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Overview
Gene expression is the process in which DNA directs the synthesis of functional products, that is, proteins. Cells can regulate gene expression at various stages. It allows organisms to generate different cell types and enables cells to adapt to internal and external factors.
Genetic Information Flows from DNA to RNA to Protein
A gene is a stretch of DNA that serves as the blueprint for functional RNAs and proteins. Since DNA is made up of nucleotides and proteins consist of amino...
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What is Gene Expression?01:36

What is Gene Expression?

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A gene is a stretch of DNA that serves as the blueprint for functional RNAs and proteins. Since DNA is comprised  of nucleotides and proteins are comprised of amino acids, a mediator is required to convert the information encoded in DNA into proteins. This mediator is the messenger RNA (mRNA). mRNA copies the blueprint from DNA by a process called transcription. In eukaryotes, transcription occurs in the nucleus by complementary base-pairing with the DNA template. The mRNA is then...
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Chromatin Position Affects Gene Expression02:35

Chromatin Position Affects Gene Expression

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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. 
Topologically Associated Domains (TADs)
The 3-dimensional positioning of chromatin in the nucleus influences the...
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Cell Specific Gene Expression01:58

Cell Specific Gene Expression

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Multicellular organisms contain a variety of structurally and functionally distinct cell types, but the DNA in all the cells originated from the same parent cells. The differences in the cells can be attributed to the differential gene expression. Liver cells, whose functions include detoxification of blood, production of bile to metabolize fats, and synthesis of proteins essential for metabolism, must express a specific set of genes to perform their functions. Gene expression also varies with...
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Regulation of Expression Occurs at Multiple Steps02:24

Regulation of Expression Occurs at Multiple Steps

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Gene expression can be regulated at almost every step from gene to protein. Transcription is the step that is most commonly regulated. This involves the binding of proteins to short regulatory sequences on the DNA. This association can either promote or inhibit the transcription of a gene associated with the respective sequence.
Transcription results in the generation of precursor (pre-mRNA) that consists of both exons and introns, which needs further processing before being translated to a...
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Acid-Base Balance01:25

Acid-Base Balance

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The human body maintains a narrow pH range regulated through acid-base balance. This balance is crucial as changes in the hydrogen ion concentration can disrupt cell membrane stability, alter protein structures, and change enzyme activities. The normal pH of arterial blood is 7.4, venous blood and interstitial fluid is 7.35, and intracellular fluid averages 7.0.
When the pH of arterial blood rises above 7.45, it results in a condition called alkalosis. Conversely, a drop below 7.35 leads to...
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Updated: Jan 29, 2026

Identifying Amino Acid Overproducers Using Rare-Codon-Rich Markers
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ColiFormer: Un modelo de optimización de codones basado en Transformer que equilibra múltiples objetivos para mejorar

Saketh Baddam1, Omar Emam2, Abdelrahman Elfikky3

  • 1Cedar Falls High School, Cedar Falls, IA 50613, USA.

Bioengineering (Basel, Switzerland)
|January 28, 2026
PubMed
Resumen

ColiFormer es una nueva herramienta de IA que optimiza las secuencias genéticas para una mejor producción de proteínas en E. coli. Equilibra múltiples factores biológicos, superando a los métodos existentes en pruebas computacionales.

Palabras clave:
Escherichia colicontrol del contenido GCoptimización del lagrangiano aumentadoíndice de adaptación de codones (CAI)optimización de codonesoptimización multiobjetivoproducción de proteínas recombinantes

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Optimized Analysis of DNA Methylation and Gene Expression from Small, Anatomically-defined Areas of the Brain
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Using an Automated Cell Counter to Simplify Gene Expression Studies: siRNA Knockdown of IL-4 Dependent Gene Expression in Namalwa Cells
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Área de la Ciencia:

  • Biología Sintética
  • Bioinformática
  • Biología Computacional

Sus antecedentes:

  • La optimización de codones mejora la expresión génica heteróloga en Escherichia coli.
  • Los métodos existentes a menudo priorizan solo el índice de adaptación de codones (CAI), pasando por alto el contexto biológico crucial.

Objetivo del estudio:

  • Introducir ColiFormer, un nuevo marco basado en Transformer para la optimización de codones.
  • Mejorar la expresión génica considerando simultáneamente múltiples parámetros biológicos.

Principales métodos:

  • Se ajustó finamente un modelo Transformer (ColiFormer) con 3676 genes de alta expresión de E. coli.
  • Se utilizaron mecanismos de autoatención y optimización del lagrangiano aumentado.
  • Se equilibraron el CAI, el contenido GC, el índice de adaptación de ARNt (tAI), la estabilidad del ARN y los elementos cis-regulatorios.

Principales resultados:

  • ColiFormer mostró valores mejorados de CAI y tAI en evaluaciones in silico.
  • Mantuvo un contenido GC óptimo y redujo los motivos cis-regulatorios inhibitorios.
  • Superó a los métodos establecidos en puntos de referencia computacionales con un tiempo de ejecución competitivo.

Conclusiones:

  • ColiFormer ofrece un enfoque más completo para la optimización de codones.
  • Las predicciones computacionales sugieren un potencial significativo para mejorar la expresión génica.
  • La herramienta y los conjuntos de datos son de código abierto para una mayor investigación y validación.