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<h1>How do genes direct the production of proteins?</h1>
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<section><div class="mp-content"><p>Most genes contain the information needed to make functional molecules called proteins. (A few genes produce regulatory molecules that help the cell assemble proteins.) The journey from gene to protein is complex and tightly controlled within each cell. It consists of two major steps: transcription and translation. Together, transcription and translation are known as gene expression.</p>
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<p>During the process of transcription, the information stored in a gene's DNA is passed to a similar molecule called RNA (ribonucleic acid) in the cell nucleus. Both RNA and DNA are made up of a chain of building blocks called nucleotides, but they have slightly different chemical properties. The type of RNA that contains the information for making a protein is called messenger RNA (mRNA) because it carries the information, or message, from the DNA out of the nucleus into the cytoplasm.</p>
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<p>Translation, the second step in getting from a gene to a protein, takes place in the cytoplasm. The mRNA interacts with a specialized complex called a ribosome, which "reads" the sequence of mRNA nucleotides. Each sequence of three nucleotides, called a codon, usually codes for one particular amino acid. (Amino acids are the building blocks of proteins.) A type of RNA called transfer RNA (tRNA) assembles the protein, one amino acid at a time. Protein assembly continues until the ribosome encounters a “stop” codon (a sequence of three nucleotides that does not code for an amino acid).</p>
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<p>The flow of information from DNA to RNA to proteins is one of the fundamental principles of molecular biology. It is so important that it is sometimes called the “central dogma.”</p>
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<div class="mediaobject"><div class="caption"><p>Through the processes of transcription and translation, information from genes is used to make proteins.</p></div>
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<div class="imagedata"><img alt="DNA is transcribed into mRNA, which is transported into the cell cytoplasm and translated into a protein." height="340" src="https://medlineplus.gov/images/PX00008S_PRESENTATION.jpeg" width="400"/></div>
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<div class="image-credit">Credit: U.S. National Library of Medicine</div></div></div>
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<h2>For more information about making proteins:</h2>
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<div class="section-body"><p>The Genetic Science Learning Center at the University of Utah offers <a href="https://learn.genetics.utah.edu/content/basics/dna" target="_blank">an interactive introduction to transcription and translation</a>.
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</p><p>Biointeractive from the Howard Hughes Medical Institute illustrates the <a href="https://www.biointeractive.org/classroom-resources/central-dogma-and-genetic-medicine" target="_blank">stages in the flow of information from DNA to RNA to protein.</a> This tool also gives examples of how modern technologies that target the different stages are used to treat genetic diseases.</p>
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<section><div class="mp-exp mp-content"><h2>Topics in the How Genes Work chapter</h2><ul><li><a data-pid="20145" href="https://medlineplus.gov/genetics/understanding/howgeneswork/protein/">What are proteins and what do they do?</a></li><li>How do genes direct the production of proteins?</li><li><a data-pid="20149" href="https://medlineplus.gov/genetics/understanding/howgeneswork/geneonoff/">Can genes be turned on and off in cells?</a></li><li><a data-pid="20151" href="https://medlineplus.gov/genetics/understanding/howgeneswork/epigenome/">What is epigenetics?</a></li><li><a data-pid="20153" href="https://medlineplus.gov/genetics/understanding/howgeneswork/cellsdivide/">How do cells divide?</a></li><li><a data-pid="20155" href="https://medlineplus.gov/genetics/understanding/howgeneswork/genesanddivision/">How do genes control the growth and division of cells?</a></li><li><a data-pid="20157" href="https://medlineplus.gov/genetics/understanding/howgeneswork/genelocation/">How do geneticists indicate the location of a gene?</a></li></ul><p><a data-pid="20081" href="https://medlineplus.gov/genetics/understanding/">Other chapters in Help Me Understand Genetics</a></p></div>
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