{"id":26670,"date":"2010-03-18T08:00:00","date_gmt":"2010-03-18T07:00:00","guid":{"rendered":"https:\/\/www.embl.org\/news\/?p=26670"},"modified":"2024-11-14T16:26:48","modified_gmt":"2024-11-14T15:26:48","slug":"what-makes-us-unique-not-only-our-genes","status":"publish","type":"post","link":"https:\/\/www.embl.org\/news\/science\/what-makes-us-unique-not-only-our-genes\/","title":{"rendered":"What makes us unique? Not only our genes"},"content":{"rendered":"\n

Once the human genome was sequenced in 2001, the hunt was on for the genes that make each of us unique. But scientists at the European Molecular Biology Laboratory (EMBL) in Heidelberg, Germany, and Yale and Stanford Universities in the USA, have found that we differ from each other mainly because of differences not in our genes, but in how they\u2019re regulated \u2013 turned on or off, for instance. In a study published today in Science<\/em>, they are the first to compare entire human genomes and determine which changes in the stretches of DNA that lie between genes make gene regulation vary from one person to the next. Their findings hail a new way of thinking about ourselves and our diseases.<\/p>\n\n\n\n

The technological advances of the past decade have been so great that scientists can now obtain the genetic sequences \u2013 or genomes \u2013 of several people in a fraction of the time and for a fraction of the cost it took to determine that first human genome. Moreover, these advances now enable researchers to understand how genes are regulated in humans.<\/p>\n\n\n\n

A group of scientists led by Jan Korbel at EMBL<\/a> and Michael Snyder initially at Yale and now in Stanford were the first to compare individually sequenced human genomes to look for what caused differences in gene regulation amongst ten different people. They focused on non-coding regions \u2013 stretches of DNA that lie between genes and, unlike genes, don\u2019t hold the instructions for producing proteins. These DNA sequences, which may vary from person to person, can act as anchors to which regulatory proteins, known as transcription factors, attach themselves to switch genes on or off.<\/p>\n\n\n\n

Korbel, Snyder, and colleagues found that up to a quarter of all human genes are regulated differently in different people, more than there are genetic variations in genes themselves. The scientists found that many of these differences in how regulatory proteins act are due to changes in the DNA sequences they bind to. In some cases, such changes can be a difference in a single letter of the genetic code, while in others a large section of DNA may be altered. But surprisingly, they discovered even more variations could not be so easily explained. They reasoned that some of these seemingly inexplicable differences might arise if regulatory proteins didn\u2019t act alone, but interacted with each other.<\/p>\n\n\n\n

\u201cWe developed a new approach which enabled us to identify cases where a protein\u2019s ability to turn a gene on or off can be affected by interactions with another protein anchored to a nearby area of the genome,\u201d Korbel explains. \u201cWith it, we can begin to understand where such interactions happen, without having to study every single regulatory protein out there.\u201d<\/p>\n\n\n\n

The scientists found that even if different people have identical copies of a gene \u2013 for instance ORMDL3, a gene known to be involved in asthma in children \u2013 the way their cells regulate that gene can vary from person to person.<\/p>\n\n\n\n

\u201cOur findings may help change the way we think of ourselves, and of diseases\u201d, Snyder concludes: \u201cas well as looking for disease genes, we could start looking at how genes are regulated, and how individual variations in gene regulation could affect patients\u2019 reactions.\u201d<\/p>\n\n\n\n

Finally, Korbel, Snyder and colleagues compared the information on humans with that from a chimpanzee, and found that with respect to gene regulation there seems to be almost as much variation between humans as between us and our primate cousins \u2013 a small margin in which may lie important clues both to how we evolved and to what makes us humans different from one another.<\/p>\n\n\n\n

In a study published online in Nature yesterday, researchers led by Snyder in the USA and Lars Steinmetz at EMBL in Heidelberg<\/a> have found that similar differences in gene regulation also occur in an organism which is much farther from us in the evolutionary tree: baker\u2019s yeast.<\/p>\n","protected":false},"excerpt":{"rendered":"

Once the human genome was sequenced in 2001, the hunt was on for the genes that make each of us unique. But scientists at the European Molecular Biology Laboratory (EMBL) in Heidelberg, Germany, and Yale and Stanford Universities in the USA, have found that we differ from each other mainly because…<\/p>\n","protected":false},"author":16,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[2,17591],"tags":[778,40,41,1950,420,1748,329,2034,768],"embl_taxonomy":[19305],"class_list":["post-26670","post","type-post","status-publish","format-standard","hentry","category-science","category-science-technology","tag-gene","tag-gene-regulation","tag-genetics","tag-human-genetics","tag-korbel","tag-press-release","tag-steinmetz","tag-transcription-factor","tag-yeast","embl_taxonomy-korbel-group"],"acf":{"show_featured_image":false,"vf_locked":false,"featured":false,"article_intro":"

What counts is how genes are regulated, say scientists at EMBL and Yale<\/p>\n","article_sources":[{"source_description":"

Kasowski, M., Grubert, F., Heffelfinger, C., Hariharan, M., Asabere, A., Waszak, S., Habegger, L., Rozowsky, J., Shi, M., Urban, A., Hong, M., Karczewski, K., Huber, W., Weissman, S., Gerstein, M., Korbel, J., Snyder, M., Variation in Transcription Factor Binding Among Humans, Science<\/em>, published online 18 March 2010. DOI: 10.1126\/science.1183621 <\/p>\n","source_link_url":"https:\/\/science.sciencemag.org\/content\/328\/5975\/232"},{"source_description":"

Zheng, W., Zhao, H., Mancera, E., Steinmetz, L., Snyder, M., Genetic Analysis of Variation in Transcription Factor Binding in Yeast, Nature<\/em>, published online 17 March 2010. DOI: 10.1038\/nature08934<\/p>\n","source_link_url":"https:\/\/www.nature.com\/articles\/nature08934"}],"related_links":false,"in_this_article":false,"color":"#007B53","youtube_url":"","mp4_url":"","video_caption":"","press_contact":"EMBL Generic","field_target_display":"embl","source_article":false},"embl_taxonomy_terms":[{"uuid":"a:3:{i:0;s:36:\"302cfdf7-365b-462a-be65-82c7b783ebf7\";i:1;s:36:\"fe59a59f-fd7d-49b3-b3e4-bdd33a6642c3\";i:2;s:36:\"ea772278-0afe-4a84-8ef0-0f426d78ea42\";}","parents":[],"name":["Korbel Group"],"slug":"korbel-group","description":"What > Genome Biology > Korbel Group"}],"yoast_head":"\nWhat makes us unique? 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