{"632590":{"#nid":"632590","#data":{"type":"news","title":"Genetics and Cancer: Research Offers New Insights On Risks, Onset, Progression","body":[{"value":"\u003Cp\u003EA new \u003Ca href=\u0022http:\/\/www.oncotarget.com\/index.php?journal=oncotarget\u0026amp;page=article\u0026amp;op=view\u0026amp;path[]=27468\u0026amp;path[]=89629\u0022\u003Estudy\u003C\/a\u003E by researchers in the \u003Ca href=\u0022https:\/\/biosciences.gatech.edu\/\u0022\u003ESchool of Biological Sciences\u003C\/a\u003E raises new questions about a decades-old, award-winning theory regarding how many genetic mutations are necessary for cancer to develop in human cells.\u003C\/p\u003E\r\n\r\n\u003Cp\u003EThat theory, called the Knudson Hypothesis, argued that two mutations in the type of genes that suppress tumors are needed to lead to changes that could cause cancer. However, \u003Ca href=\u0022https:\/\/biosciences.gatech.edu\/people\/john-mcdonald\u0022\u003EJohn McDonald\u003C\/a\u003E, a School of Biological Sciences professor and the director of Georgia Tech\u0026rsquo;s \u003Ca href=\u0022https:\/\/icrc.gatech.edu\/\u0022\u003EIntegrated Cancer Research Center\u003C\/a\u003E, says the research, published in \u003Cem\u003EOncotarget\u003C\/em\u003E, \u0026ldquo;shows, for the first time, that nearly all normal healthy individuals carry at least one potentially cancer-causing tumor suppressor gene mutation. The implication is that a majority of the human population is, to a greater or lesser extent, predisposed to develop cancer.\u0026rdquo;\u003C\/p\u003E\r\n\r\n\u003Cp\u003EMcDonald and his fellow researchers \u0026mdash;\u003Ca href=\u0022https:\/\/biosciences.gatech.edu\/people\/evan-clayton\u0022\u003E Evan A. Clayton\u003C\/a\u003E, \u003Ca href=\u0022https:\/\/bioinformatics.gatech.edu\/people\/Shareef-Khalid\u0022\u003EShareef Khalid\u003C\/a\u003E, \u003Ca href=\u0022https:\/\/bioinformatics.gatech.edu\/people\/Dongjo-Ban\u0022\u003EDongjo Ban\u003C\/a\u003E, \u003Ca href=\u0022https:\/\/bioinformatics.gatech.edu\/people\/Lu-Wang\u0022\u003ELu Wang\u003C\/a\u003E and Professor \u003Ca href=\u0022https:\/\/biosciences.gatech.edu\/people\/king-jordan\u0022\u003EI. King Jordan\u003C\/a\u003E, all of Georgia Tech \u0026mdash; relied on several databases, including the \u003Ca href=\u0022https:\/\/cancer.sanger.ac.uk\/cosmic\u0022\u003ECatalogue of Somatic Mutations in Cancer (COSMIC)\u003C\/a\u003E, the world\u0026rsquo;s largest database of mutations associated with cancer onset and progression. The scientists combined that database with the\u003Ca href=\u0022https:\/\/www.internationalgenome.org\/\u0022\u003E One Thousand Genomes Project (1KGP)\u003C\/a\u003E, which lists genetic variants present, in 2,504 normal, healthy individuals. That list reflects the diversity of racial and ethnic groups randomly selected from 26 human populations around the world.\u003C\/p\u003E\r\n\r\n\u003Cp\u003EThe Knudson Hypothesis, developed in 1971 by Alfred Knudson, helped physicians identify cancer-related genes, and won Knudson the prestigious \u003Ca href=\u0022http:\/\/www.laskerfoundation.org\/awards\/\u0022\u003EAlbert Lasker Award\u003C\/a\u003E in Clinical Medical Research in 1998.\u003C\/p\u003E\r\n\r\n\u003Cp\u003E\u0026ldquo;Inconsistent with the Knudson two-hit hypothesis, we present evidence that acquisition of a second cancer-causing tumor suppressor mutation is not necessary to drive cancer onset\/progression. Rather, we present evidence that, in many cases, individuals with only a single cancer-causing tumor suppressor mutation develop cancer,\u0026rdquo; McDonald says. \u0026ldquo;In these individuals, we show that the mutant gene is significantly overexpressed relative to the normal gene, thus overriding the influence of the non-mutated gene and driving cancer onset and development. Thus, in many individuals, a change in gene expression, rather than a \u0026lsquo;second mutational hit,\u0026rsquo; is responsible for the cancer.\u0026rdquo;\u003C\/p\u003E\r\n\r\n\u003Cp\u003EAll humans have two copies of every gene, each copy supplied by a biological parent. Two classes of genes are believed to cause the onset and progression of cancer. Oncogenes are genes that can drive cancer after a single mutation in one of the copies of the gene. In other words, those mutations are said to be \u0026ldquo;dominant\u0026rdquo; with respect to their ability to result in cancer.\u003C\/p\u003E\r\n\r\n\u003Cp\u003EUnlike oncogenes, a second class of cancer-driving genes, called tumor suppressor genes, are considered to be recessive. Knudson\u0026rsquo;s hypothesis took the point of view that mutations in each of the two copies of the tumor suppressor genes had to happen in order to drive cancer development. McDonald says the hypothesis is still widely held in 2020 by the cancer community.\u003C\/p\u003E\r\n\r\n\u003Cp\u003E\u0026ldquo;We believe that our findings are of major significance and call into question many of the assumptions underlying current methods to diagnose and treat cancer based on genomic profiling,\u0026rdquo; McDonald says.\u003C\/p\u003E\r\n\r\n\u003Cp\u003E\u003Cem\u003EThis research was supported by the Ovarian Cancer Institute (Atlanta), Northside Hospital (Atlanta), the Deborah Nash Endowment Fund, and National Institute of Health Bioinformatics Training Grant: CRP 10-2012-03.\u003C\/em\u003E\u003C\/p\u003E\r\n","summary":null,"format":"limited_html"}],"field_subtitle":[{"value":"School of Biological Sciences\u2019 research tests widely-held medical hypothesis"}],"field_summary":[{"value":"\u003Cp\u003EA new study from the School of Biological Sciences raises questions about the chances for cancer to develop in human cells. The research, led by Professor John McDonald, is testing a widely-held hypothesis that involves how many mutations in tumor-suppressing genes are needed for the onset and development of the disease.\u003C\/p\u003E\r\n","format":"limited_html"}],"field_summary_sentence":[{"value":"School of Biological Sciences\u2019 research tests widely-held medical hypothesis"}],"uid":"34434","created_gmt":"2020-02-18 16:49:56","changed_gmt":"2020-02-24 18:17:44","author":"Renay San Miguel","boilerplate_text":"","field_publication":"","field_article_url":"","dateline":{"date":"2020-02-18T00:00:00-05:00","iso_date":"2020-02-18T00:00:00-05:00","tz":"America\/New_York"},"extras":[],"hg_media":{"632608":{"id":"632608","type":"image","title":"A dying cancer cell with filopodia stretched out to its right. The protrusions help cancer migrate. Stock NIH NCMIR image. The image does not display a cell treated in the Georgia Tech study. Credit: NIH-funded image of HeLa cell \/ National Center for Mic","body":null,"created":"1582050112","gmt_created":"2020-02-18 18:21:52","changed":"1582050658","gmt_changed":"2020-02-18 18:30:58","alt":"Dying cancer cell from NIH microscopy","file":{"fid":"240695","name":"breast_cancer_apop.nih__9.jpg","image_path":"\/sites\/default\/files\/images\/breast_cancer_apop.nih__9.jpg","image_full_path":"http:\/\/www.tlwarc.hg.gatech.edu\/\/sites\/default\/files\/images\/breast_cancer_apop.nih__9.jpg","mime":"image\/jpeg","size":112587,"path_740":"http:\/\/www.tlwarc.hg.gatech.edu\/sites\/default\/files\/styles\/740xx_scale\/public\/images\/breast_cancer_apop.nih__9.jpg?itok=guoTVgYy"}},"632593":{"id":"632593","type":"image","title":"Cancer associated mutations were identified in the 1000 genomes population (1KGP.)","body":null,"created":"1582045362","gmt_created":"2020-02-18 17:02:42","changed":"1582050694","gmt_changed":"2020-02-18 18:31:34","alt":"","file":{"fid":"240687","name":"McDonald cancer study graphic.jpg","image_path":"\/sites\/default\/files\/images\/McDonald%20cancer%20study%20graphic.jpg","image_full_path":"http:\/\/www.tlwarc.hg.gatech.edu\/\/sites\/default\/files\/images\/McDonald%20cancer%20study%20graphic.jpg","mime":"image\/jpeg","size":184245,"path_740":"http:\/\/www.tlwarc.hg.gatech.edu\/sites\/default\/files\/styles\/740xx_scale\/public\/images\/McDonald%20cancer%20study%20graphic.jpg?itok=PBsSBsZ_"}},"632592":{"id":"632592","type":"image","title":"John McDonald, professor in the School of Biological Sciences and director of the Integrated Cancer Research Center. ","body":null,"created":"1582044785","gmt_created":"2020-02-18 16:53:05","changed":"1582044785","gmt_changed":"2020-02-18 16:53:05","alt":"","file":{"fid":"240686","name":"John McDonald head shot.jpg","image_path":"\/sites\/default\/files\/images\/John%20McDonald%20head%20shot.jpg","image_full_path":"http:\/\/www.tlwarc.hg.gatech.edu\/\/sites\/default\/files\/images\/John%20McDonald%20head%20shot.jpg","mime":"image\/jpeg","size":387271,"path_740":"http:\/\/www.tlwarc.hg.gatech.edu\/sites\/default\/files\/styles\/740xx_scale\/public\/images\/John%20McDonald%20head%20shot.jpg?itok=sVr9yekz"}}},"media_ids":["632608","632593","632592"],"groups":[{"id":"1278","name":"College of Sciences"},{"id":"1275","name":"School of Biological Sciences"},{"id":"1292","name":"Parker H. Petit Institute for Bioengineering and Bioscience (IBB)"}],"categories":[{"id":"146","name":"Life Sciences and Biology"}],"keywords":[{"id":"126571","name":"go-PetitInstitute"},{"id":"4896","name":"College of Sciences"},{"id":"166882","name":"School of Biological Sciences"},{"id":"2371","name":"John McDonald"},{"id":"46481","name":"Integrated Cancer Research Center"},{"id":"183994","name":"oncogenes"},{"id":"385","name":"cancer"},{"id":"5718","name":"Genetics"},{"id":"183995","name":"genotypes"},{"id":"172695","name":"go-icrc"},{"id":"172669","name":"go-icrc-news"}],"core_research_areas":[],"news_room_topics":[],"event_categories":[],"invited_audience":[],"affiliations":[],"classification":[],"areas_of_expertise":[],"news_and_recent_appearances":[],"phone":[],"contact":[{"value":"\u003Cp\u003ERenay San Miguel\u003Cbr \/\u003E\r\nCommunications Officer\u003Cbr \/\u003E\r\nCollege of Sciences\u003Cbr \/\u003E\r\n404-894-5209\u003C\/p\u003E\r\n\r\n\u003Cp\u003E\u0026nbsp;\u003C\/p\u003E\r\n","format":"limited_html"}],"email":["renay.san@cos.gatech.edu"],"slides":[],"orientation":[],"userdata":""}}}