{"id":3284,"date":"2016-12-12T21:13:16","date_gmt":"2016-12-12T21:13:16","guid":{"rendered":"https:\/\/courses.lumenlearning.com\/wm-biology1\/?post_type=chapter&#038;p=3284"},"modified":"2024-04-26T00:24:00","modified_gmt":"2024-04-26T00:24:00","slug":"reading-prokaryotic-and-eukaryotic-gene-regulation","status":"publish","type":"chapter","link":"https:\/\/courses.lumenlearning.com\/wm-nmbiology1\/chapter\/reading-prokaryotic-and-eukaryotic-gene-regulation\/","title":{"raw":"Prokaryotic and Eukaryotic Gene Regulation","rendered":"Prokaryotic and Eukaryotic Gene Regulation"},"content":{"raw":"<div class=\"textbox learning-objectives\">\r\n<h3>Learning Outcomes<\/h3>\r\n<ul>\r\n \t<li>Compare prokaryotic and eukaryotic gene regulation<\/li>\r\n<\/ul>\r\n<\/div>\r\nTo understand how gene expression is regulated, we must first understand how a gene codes for a functional protein in a cell. The process occurs in both prokaryotic and eukaryotic cells, just in slightly different manners.\r\n\r\n<strong><span style=\"text-decoration: underline;\">Prokaryotic organisms<\/span><\/strong> are single-celled organisms that lack a cell nucleus, and their DNA therefore floats freely in the cell cytoplasm. To synthesize a protein, the processes of transcription and translation occur almost simultaneously. When the resulting protein is no longer needed, transcription stops. As a result, the primary method to control what type of protein and how much of each protein is expressed in a prokaryotic cell is the <strong>regulation of DNA transcription<\/strong>. All of the subsequent steps occur automatically. When more protein is required, more transcription occurs. Therefore, in prokaryotic cells, the control of gene expression is mostly at the transcriptional level.\r\n\r\n<strong>Eukaryotic cells<\/strong>, in contrast, have intracellular organelles that add to their complexity. In eukaryotic cells, the DNA is contained inside the cell\u2019s nucleus and there it is transcribed into RNA. The newly synthesized RNA is then transported out of the nucleus into the cytoplasm, where ribosomes translate the RNA into protein. The processes of transcription and translation are physically separated by the nuclear membrane; transcription occurs only within the nucleus, and translation occurs only outside the nucleus in the cytoplasm. <strong>The regulation of gene expression can occur at all stages of the process<\/strong> (Figure 1). Regulation may occur when the DNA is uncoiled and loosened from nucleosomes to bind transcription factors (<strong>epigenetic<\/strong> level), when the RNA is transcribed (transcriptional level), when the RNA is processed and exported to the cytoplasm after it is transcribed (<strong>post-transcriptional<\/strong> level), when the RNA is translated into protein (translational level), or after the protein has been made (<strong>post-translational<\/strong> level).\r\n\r\n[caption id=\"attachment_3882\" align=\"aligncenter\" width=\"1024\"]<img class=\"size-large wp-image-3882\" src=\"https:\/\/s3-us-west-2.amazonaws.com\/courses-images\/wp-content\/uploads\/sites\/1087\/2016\/12\/12210316\/Figure_16_01_01-1024x434.jpg\" alt=\"Prokaryotic cells do not have a nucleus, and DNA is located in the cytoplasm. Ribosomes attach to the mRNA as it is being transcribed from DNA. Thus, transcription and translation occur simultaneously. In eukaryotic cells, the DNA is located in the nucleus, and ribosomes are located in the cytoplasm. After being transcribed, pre-mRNA is processed in the nucleus to make the mature mRNA, which is then exported to the cytoplasm where ribosomes become associated with it and translation begins.\" width=\"1024\" height=\"434\" \/> Figure 1. Prokaryotic transcription and translation occur simultaneously in the cytoplasm, and regulation occurs at the transcriptional level. Eukaryotic gene expression is regulated during transcription and RNA processing, which take place in the nucleus, and during protein translation, which takes place in the cytoplasm. Further regulation may occur through post-translational modifications of proteins.[\/caption]\r\n\r\nThe differences in the regulation of gene expression between prokaryotes and eukaryotes are summarized in Table 1. The regulation of gene expression in these types of organisms is discussed in detail in subsequent sections.\r\n<table>\r\n<thead>\r\n<tr>\r\n<th colspan=\"2\">Table 1.\u00a0Differences in the Regulation of Gene Expression of Prokaryotic and Eukaryotic Organisms<\/th>\r\n<\/tr>\r\n<tr>\r\n<th>Prokaryotic organisms<\/th>\r\n<th>Eukaryotic organisms<\/th>\r\n<\/tr>\r\n<\/thead>\r\n<tbody>\r\n<tr>\r\n<td>Lack nucleus<\/td>\r\n<td>Contain nucleus<\/td>\r\n<\/tr>\r\n<tr>\r\n<td>DNA is found in the cytoplasm<\/td>\r\n<td>DNA is confined to the nuclear compartment<\/td>\r\n<\/tr>\r\n<tr>\r\n<td>RNA transcription and protein formation occur almost simultaneously<\/td>\r\n<td>RNA transcription occurs prior to protein formation, and it takes place in the nucleus. Translation of RNA to protein occurs in the cytoplasm.<\/td>\r\n<\/tr>\r\n<tr>\r\n<td>Gene expression is regulated primarily at the transcriptional level<\/td>\r\n<td>Gene expression is regulated at many levels (epigenetic, transcriptional, nuclear shuttling, post-transcriptional, translational, and post-translational)<\/td>\r\n<\/tr>\r\n<\/tbody>\r\n<\/table>\r\n<div class=\"textbox exercises\">\r\n<h3>Practice Questions<\/h3>\r\nControl of gene expression in eukaryotic cells occurs at which level(s)?\r\n<ol style=\"list-style-type: lower-alpha;\">\r\n \t<li>only the transcriptional level<\/li>\r\n \t<li>epigenetic and transcriptional levels<\/li>\r\n \t<li>epigenetic, transcriptional, and translational levels<\/li>\r\n \t<li>epigenetic, transcriptional, post-transcriptional, translational, and post-translational levels<\/li>\r\n<\/ol>\r\n[reveal-answer q=\"386227\"]Show Answer[\/reveal-answer]\r\n[hidden-answer a=\"386227\"]Answer d. Control of gene expression in eukaryotic cells occurs at epigenetic, transcriptional, post-transcriptional, translational, and post-translational levels.\r\n\r\n[\/hidden-answer]\r\n\r\nPost-translational control refers to the:\r\n<ol style=\"list-style-type: lower-alpha;\">\r\n \t<li>regulation of gene expression after transcription<\/li>\r\n \t<li>regulation of gene expression after translation<\/li>\r\n \t<li>control of epigenetic activation<\/li>\r\n \t<li>period between transcription and translation<\/li>\r\n<\/ol>\r\n[reveal-answer q=\"960802\"]Show Answer[\/reveal-answer]\r\n[hidden-answer a=\"960802\"]Answer b.\u00a0Post-translational control refers to the regulation of gene expression after translation[\/hidden-answer]\r\n\r\n<\/div>\r\n<div class=\"textbox tryit\">\r\n<h3>Try It<\/h3>\r\nhttps:\/\/assess.lumenlearning.com\/practice\/e34a3b38-17a1-4887-90ea-0f9c961ad283\r\n<\/div>","rendered":"<div class=\"textbox learning-objectives\">\n<h3>Learning Outcomes<\/h3>\n<ul>\n<li>Compare prokaryotic and eukaryotic gene regulation<\/li>\n<\/ul>\n<\/div>\n<p>To understand how gene expression is regulated, we must first understand how a gene codes for a functional protein in a cell. The process occurs in both prokaryotic and eukaryotic cells, just in slightly different manners.<\/p>\n<p><strong><span style=\"text-decoration: underline;\">Prokaryotic organisms<\/span><\/strong> are single-celled organisms that lack a cell nucleus, and their DNA therefore floats freely in the cell cytoplasm. To synthesize a protein, the processes of transcription and translation occur almost simultaneously. When the resulting protein is no longer needed, transcription stops. As a result, the primary method to control what type of protein and how much of each protein is expressed in a prokaryotic cell is the <strong>regulation of DNA transcription<\/strong>. All of the subsequent steps occur automatically. When more protein is required, more transcription occurs. Therefore, in prokaryotic cells, the control of gene expression is mostly at the transcriptional level.<\/p>\n<p><strong>Eukaryotic cells<\/strong>, in contrast, have intracellular organelles that add to their complexity. In eukaryotic cells, the DNA is contained inside the cell\u2019s nucleus and there it is transcribed into RNA. The newly synthesized RNA is then transported out of the nucleus into the cytoplasm, where ribosomes translate the RNA into protein. The processes of transcription and translation are physically separated by the nuclear membrane; transcription occurs only within the nucleus, and translation occurs only outside the nucleus in the cytoplasm. <strong>The regulation of gene expression can occur at all stages of the process<\/strong> (Figure 1). Regulation may occur when the DNA is uncoiled and loosened from nucleosomes to bind transcription factors (<strong>epigenetic<\/strong> level), when the RNA is transcribed (transcriptional level), when the RNA is processed and exported to the cytoplasm after it is transcribed (<strong>post-transcriptional<\/strong> level), when the RNA is translated into protein (translational level), or after the protein has been made (<strong>post-translational<\/strong> level).<\/p>\n<div id=\"attachment_3882\" style=\"width: 1034px\" class=\"wp-caption aligncenter\"><img loading=\"lazy\" decoding=\"async\" aria-describedby=\"caption-attachment-3882\" class=\"size-large wp-image-3882\" src=\"https:\/\/s3-us-west-2.amazonaws.com\/courses-images\/wp-content\/uploads\/sites\/1087\/2016\/12\/12210316\/Figure_16_01_01-1024x434.jpg\" alt=\"Prokaryotic cells do not have a nucleus, and DNA is located in the cytoplasm. Ribosomes attach to the mRNA as it is being transcribed from DNA. Thus, transcription and translation occur simultaneously. In eukaryotic cells, the DNA is located in the nucleus, and ribosomes are located in the cytoplasm. After being transcribed, pre-mRNA is processed in the nucleus to make the mature mRNA, which is then exported to the cytoplasm where ribosomes become associated with it and translation begins.\" width=\"1024\" height=\"434\" \/><\/p>\n<p id=\"caption-attachment-3882\" class=\"wp-caption-text\">Figure 1. Prokaryotic transcription and translation occur simultaneously in the cytoplasm, and regulation occurs at the transcriptional level. Eukaryotic gene expression is regulated during transcription and RNA processing, which take place in the nucleus, and during protein translation, which takes place in the cytoplasm. Further regulation may occur through post-translational modifications of proteins.<\/p>\n<\/div>\n<p>The differences in the regulation of gene expression between prokaryotes and eukaryotes are summarized in Table 1. The regulation of gene expression in these types of organisms is discussed in detail in subsequent sections.<\/p>\n<table>\n<thead>\n<tr>\n<th colspan=\"2\">Table 1.\u00a0Differences in the Regulation of Gene Expression of Prokaryotic and Eukaryotic Organisms<\/th>\n<\/tr>\n<tr>\n<th>Prokaryotic organisms<\/th>\n<th>Eukaryotic organisms<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td>Lack nucleus<\/td>\n<td>Contain nucleus<\/td>\n<\/tr>\n<tr>\n<td>DNA is found in the cytoplasm<\/td>\n<td>DNA is confined to the nuclear compartment<\/td>\n<\/tr>\n<tr>\n<td>RNA transcription and protein formation occur almost simultaneously<\/td>\n<td>RNA transcription occurs prior to protein formation, and it takes place in the nucleus. Translation of RNA to protein occurs in the cytoplasm.<\/td>\n<\/tr>\n<tr>\n<td>Gene expression is regulated primarily at the transcriptional level<\/td>\n<td>Gene expression is regulated at many levels (epigenetic, transcriptional, nuclear shuttling, post-transcriptional, translational, and post-translational)<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<div class=\"textbox exercises\">\n<h3>Practice Questions<\/h3>\n<p>Control of gene expression in eukaryotic cells occurs at which level(s)?<\/p>\n<ol style=\"list-style-type: lower-alpha;\">\n<li>only the transcriptional level<\/li>\n<li>epigenetic and transcriptional levels<\/li>\n<li>epigenetic, transcriptional, and translational levels<\/li>\n<li>epigenetic, transcriptional, post-transcriptional, translational, and post-translational levels<\/li>\n<\/ol>\n<div class=\"qa-wrapper\" style=\"display: block\"><span class=\"show-answer collapsed\" style=\"cursor: pointer\" data-target=\"q386227\">Show Answer<\/span><\/p>\n<div id=\"q386227\" class=\"hidden-answer\" style=\"display: none\">Answer d. Control of gene expression in eukaryotic cells occurs at epigenetic, transcriptional, post-transcriptional, translational, and post-translational levels.<\/p>\n<\/div>\n<\/div>\n<p>Post-translational control refers to the:<\/p>\n<ol style=\"list-style-type: lower-alpha;\">\n<li>regulation of gene expression after transcription<\/li>\n<li>regulation of gene expression after translation<\/li>\n<li>control of epigenetic activation<\/li>\n<li>period between transcription and translation<\/li>\n<\/ol>\n<div class=\"qa-wrapper\" style=\"display: block\"><span class=\"show-answer collapsed\" style=\"cursor: pointer\" data-target=\"q960802\">Show Answer<\/span><\/p>\n<div id=\"q960802\" class=\"hidden-answer\" style=\"display: none\">Answer b.\u00a0Post-translational control refers to the regulation of gene expression after translation<\/div>\n<\/div>\n<\/div>\n<div class=\"textbox tryit\">\n<h3>Try It<\/h3>\n<p>\t<iframe id=\"assessment_practice_e34a3b38-17a1-4887-90ea-0f9c961ad283\" class=\"resizable\" src=\"https:\/\/assess.lumenlearning.com\/practice\/e34a3b38-17a1-4887-90ea-0f9c961ad283?iframe_resize_id=assessment_practice_id_e34a3b38-17a1-4887-90ea-0f9c961ad283\" frameborder=\"0\" style=\"border:none;width:100%;height:100%;min-height:300px;\"><br \/>\n\t<\/iframe>\n<\/div>\n\n\t\t\t <section class=\"citations-section\" role=\"contentinfo\">\n\t\t\t <h3>Candela Citations<\/h3>\n\t\t\t\t\t <div>\n\t\t\t\t\t\t <div id=\"citation-list-3284\">\n\t\t\t\t\t\t\t <div class=\"licensing\"><div class=\"license-attribution-dropdown-subheading\">CC licensed content, Shared previously<\/div><ul class=\"citation-list\"><li>Biology. <strong>Provided by<\/strong>: OpenStax CNX. <strong>Located at<\/strong>: <a target=\"_blank\" href=\"http:\/\/cnx.org\/contents\/185cbf87-c72e-48f5-b51e-f14f21b5eabd@10.8\">http:\/\/cnx.org\/contents\/185cbf87-c72e-48f5-b51e-f14f21b5eabd@10.8<\/a>. <strong>License<\/strong>: <em><a target=\"_blank\" rel=\"license\" href=\"https:\/\/creativecommons.org\/licenses\/by\/4.0\/\">CC BY: Attribution<\/a><\/em>. <strong>License Terms<\/strong>: Download for free at http:\/\/cnx.org\/contents\/185cbf87-c72e-48f5-b51e-f14f21b5eabd@10.8<\/li><\/ul><\/div>\n\t\t\t\t\t\t <\/div>\n\t\t\t\t\t <\/div>\n\t\t\t <\/section>","protected":false},"author":17,"menu_order":4,"template":"","meta":{"_candela_citation":"[{\"type\":\"cc\",\"description\":\"Biology\",\"author\":\"\",\"organization\":\"OpenStax CNX\",\"url\":\"http:\/\/cnx.org\/contents\/185cbf87-c72e-48f5-b51e-f14f21b5eabd@10.8\",\"project\":\"\",\"license\":\"cc-by\",\"license_terms\":\"Download for free at http:\/\/cnx.org\/contents\/185cbf87-c72e-48f5-b51e-f14f21b5eabd@10.8\"}]","CANDELA_OUTCOMES_GUID":"835056c3-34d3-4024-bd89-de6f54bbfa0c, 468cc4de-ec79-4fca-b57c-d07040f29bce","pb_show_title":"on","pb_short_title":"","pb_subtitle":"","pb_authors":[],"pb_section_license":""},"chapter-type":[],"contributor":[],"license":[],"class_list":["post-3284","chapter","type-chapter","status-publish","hentry"],"part":3270,"_links":{"self":[{"href":"https:\/\/courses.lumenlearning.com\/wm-nmbiology1\/wp-json\/pressbooks\/v2\/chapters\/3284","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/courses.lumenlearning.com\/wm-nmbiology1\/wp-json\/pressbooks\/v2\/chapters"}],"about":[{"href":"https:\/\/courses.lumenlearning.com\/wm-nmbiology1\/wp-json\/wp\/v2\/types\/chapter"}],"author":[{"embeddable":true,"href":"https:\/\/courses.lumenlearning.com\/wm-nmbiology1\/wp-json\/wp\/v2\/users\/17"}],"version-history":[{"count":14,"href":"https:\/\/courses.lumenlearning.com\/wm-nmbiology1\/wp-json\/pressbooks\/v2\/chapters\/3284\/revisions"}],"predecessor-version":[{"id":6756,"href":"https:\/\/courses.lumenlearning.com\/wm-nmbiology1\/wp-json\/pressbooks\/v2\/chapters\/3284\/revisions\/6756"}],"part":[{"href":"https:\/\/courses.lumenlearning.com\/wm-nmbiology1\/wp-json\/pressbooks\/v2\/parts\/3270"}],"metadata":[{"href":"https:\/\/courses.lumenlearning.com\/wm-nmbiology1\/wp-json\/pressbooks\/v2\/chapters\/3284\/metadata\/"}],"wp:attachment":[{"href":"https:\/\/courses.lumenlearning.com\/wm-nmbiology1\/wp-json\/wp\/v2\/media?parent=3284"}],"wp:term":[{"taxonomy":"chapter-type","embeddable":true,"href":"https:\/\/courses.lumenlearning.com\/wm-nmbiology1\/wp-json\/pressbooks\/v2\/chapter-type?post=3284"},{"taxonomy":"contributor","embeddable":true,"href":"https:\/\/courses.lumenlearning.com\/wm-nmbiology1\/wp-json\/wp\/v2\/contributor?post=3284"},{"taxonomy":"license","embeddable":true,"href":"https:\/\/courses.lumenlearning.com\/wm-nmbiology1\/wp-json\/wp\/v2\/license?post=3284"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}