{"id":25567,"date":"2020-01-30T00:00:40","date_gmt":"2020-01-30T08:00:40","guid":{"rendered":"https:\/\/vermont.salk.edu\/?post_type=disclosure&#038;p=25567"},"modified":"2024-01-30T14:42:41","modified_gmt":"2024-01-30T22:42:41","slug":"salk-scientists-link-rapid-brain-growth-in-autism-to-dna-damage","status":"publish","type":"disclosure","link":"https:\/\/www.salk.edu\/zh\/news-release\/salk-scientists-link-rapid-brain-growth-in-autism-to-dna-damage\/","title":{"rendered":"Salk scientists link rapid brain growth in autism to DNA damage"},"content":{"rendered":"<p>LA JOLLA\u2014Researchers at the Salk Institute have discovered a unique pattern of DNA damage that arises in brain cells derived from individuals with a macrocephalic form of autism spectrum disorder (ASD). The observation, published in the journal <a href=\"https:\/\/www.cell.com\/cell-stem-cell\/fulltext\/S1934-5909(19)30571-5\" target=\"_blank\" rel=\"noopener\"><em>Cell Stem Cell<\/em><\/a>, helps explain what might go awry in the brain during cell division and development to cause the disorder.<\/p>\n<p>\u201cDivision, or replication, is one of the most dangerous things that a cell can do,\u201d says Salk Professor\u00a0<a href=\"https:\/\/www.salk.edu\/zh\/scientist\/rusty-gage\/\">\u9c81\u65af\u8482\u00b7\u76d6\u5947<\/a>, the study\u2019s senior author and president of the Institute. \u201cMost DNA damage is repaired through a remarkably efficient repair process, but errors occur when the rate of division is altered genetically or environmentally, which can lead to long-term functional defects.\u201d<\/p>\n<figure id=\"attachment_25589\"  class=\"wp-caption alignright\"><img loading=\"lazy\" decoding=\"async\" width=\"458\" height=\"233\" class=\"img-responsive wp-image-25589 size-col-md-5\" src=\"https:\/\/www.salk.edu\/wp-content\/uploads\/2020\/01\/gage-image-458x233.jpg\" alt=\"Cells that will eventually become neurons (neural progenitor cells) derived from individuals with autism spectrum disorder, shown in the right panel, exhibit increased DNA damage detected by \u03b3H2AX, shown in the red stain, compared to those derived from healthy individuals (left panel).\" srcset=\"https:\/\/www.salk.edu\/wp-content\/uploads\/2020\/01\/gage-image-458x233.jpg 458w, https:\/\/www.salk.edu\/wp-content\/uploads\/2020\/01\/gage-image-300x153.jpg 300w, https:\/\/www.salk.edu\/wp-content\/uploads\/2020\/01\/gage-image-768x391.jpg 768w, https:\/\/www.salk.edu\/wp-content\/uploads\/2020\/01\/gage-image-1024x522.jpg 1024w, https:\/\/www.salk.edu\/wp-content\/uploads\/2020\/01\/gage-image-147x75.jpg 147w, https:\/\/www.salk.edu\/wp-content\/uploads\/2020\/01\/gage-image-585x298.jpg 585w, https:\/\/www.salk.edu\/wp-content\/uploads\/2020\/01\/gage-image-553x282.jpg 553w, https:\/\/www.salk.edu\/wp-content\/uploads\/2020\/01\/gage-image-750x382.jpg 750w, https:\/\/www.salk.edu\/wp-content\/uploads\/2020\/01\/gage-image-767x391.jpg 767w, https:\/\/www.salk.edu\/wp-content\/uploads\/2020\/01\/gage-image-945x482.jpg 945w, https:\/\/www.salk.edu\/wp-content\/uploads\/2020\/01\/gage-image-1250x637.jpg 1250w, https:\/\/www.salk.edu\/wp-content\/uploads\/2020\/01\/gage-image-400x204.jpg 400w, https:\/\/www.salk.edu\/wp-content\/uploads\/2020\/01\/gage-image.jpg 1619w\" sizes=\"auto, (max-width: 458px) 100vw, 458px\" \/><figcaption class=\"wp-caption-text\">Cells that will eventually become neurons (neural progenitor cells) derived from individuals with autism spectrum disorder (right panel) exhibit increased DNA damage (indicated by the red stain) compared to those derived from healthy individuals (left panel).<\/p>\n<p><a href=\"https:\/\/www.salk.edu\/wp-content\/uploads\/2020\/01\/gage-image.jpg\">Click here<\/a> for a high-resolution image.<\/p>\n<p>Credit: Salk Institute<\/figcaption><\/figure>\n<p>ASD, a developmental disorder of communication and behavior, affects about 1 in 59 children in the US, <a href=\"https:\/\/www.cdc.gov\/ncbddd\/autism\/data.html\">according to the Centers for Disease Control and Prevention<\/a>. Research into the underlying causes of the disorder, as well as possible treatments, has been slow.<\/p>\n<p>In 2016, Gage and his colleagues discovered that brain stem cells from people with the macrocephalic form of autism <a href=\"https:\/\/www.salk.edu\/zh\/news-release\/new-neurons-reveal-clues-about-an-individuals-autism\/\">grew more quickly<\/a> than cells from unaffected individuals. (Brain stem cells are precursors to more-specialized types of cells, such as neurons.) The finding explained, in part, why many people with ASD also have macrocephaly, or unusually large heads: more proliferation of brain stem cells during development can lead to larger brains.<\/p>\n<p>In the new research, Gage and his colleagues again looked at these neural precursor cells (NPCs). As all cell types proliferate and mature during embryonic development, it\u2019s normal for their quickly-replicating strands of DNA to accumulate small errors, most of which are corrected and never do any harm. The researchers wondered whether this DNA damage that occurred during the stress of replication was more common in the quickly-dividing neural precursors of people with autism.<\/p>\n<p>The researchers collected skin cells from individuals with both ASD and macrocephaly, as well as from neurotypical individuals (without ASD), and used stem-cell reprogramming technology to coax each person\u2019s cells into NPCs.<\/p>\n<p>Gage\u2019s team used a chemical compound to induce replication stress on the NPCs derived from people without autism and studied where DNA damage was most likely to accumulate. They compared this induced damage in cells from individuals without autism to where DNA damage naturally accumulated in the cells from people with autism. The NPCs from autistic individuals had heightened levels of DNA damage, clustered in 36 of the same genes that had also been damaged in healthy cells exposed to replication stress. And 20 of the genes had been previously linked to autism in separate genetic studies.<\/p>\n<figure id=\"attachment_25591\"  class=\"wp-caption alignleft\"><img loading=\"lazy\" decoding=\"async\" width=\"458\" height=\"305\" class=\"img-responsive wp-image-25591 size-col-md-5\" src=\"https:\/\/www.salk.edu\/wp-content\/uploads\/2020\/01\/Meiyan-Wang-and-Rusty-Gage-458x305.jpg\" alt=\"From left: Meiyan Wang and Rusty Gage.\" srcset=\"https:\/\/www.salk.edu\/wp-content\/uploads\/2020\/01\/Meiyan-Wang-and-Rusty-Gage-458x305.jpg 458w, https:\/\/www.salk.edu\/wp-content\/uploads\/2020\/01\/Meiyan-Wang-and-Rusty-Gage-300x200.jpg 300w, https:\/\/www.salk.edu\/wp-content\/uploads\/2020\/01\/Meiyan-Wang-and-Rusty-Gage-768x512.jpg 768w, https:\/\/www.salk.edu\/wp-content\/uploads\/2020\/01\/Meiyan-Wang-and-Rusty-Gage-1024x683.jpg 1024w, https:\/\/www.salk.edu\/wp-content\/uploads\/2020\/01\/Meiyan-Wang-and-Rusty-Gage-147x98.jpg 147w, https:\/\/www.salk.edu\/wp-content\/uploads\/2020\/01\/Meiyan-Wang-and-Rusty-Gage-585x390.jpg 585w, https:\/\/www.salk.edu\/wp-content\/uploads\/2020\/01\/Meiyan-Wang-and-Rusty-Gage-553x369.jpg 553w, https:\/\/www.salk.edu\/wp-content\/uploads\/2020\/01\/Meiyan-Wang-and-Rusty-Gage-750x500.jpg 750w, https:\/\/www.salk.edu\/wp-content\/uploads\/2020\/01\/Meiyan-Wang-and-Rusty-Gage-767x511.jpg 767w, https:\/\/www.salk.edu\/wp-content\/uploads\/2020\/01\/Meiyan-Wang-and-Rusty-Gage-945x630.jpg 945w, https:\/\/www.salk.edu\/wp-content\/uploads\/2020\/01\/Meiyan-Wang-and-Rusty-Gage-1250x833.jpg 1250w, https:\/\/www.salk.edu\/wp-content\/uploads\/2020\/01\/Meiyan-Wang-and-Rusty-Gage-400x267.jpg 400w, https:\/\/www.salk.edu\/wp-content\/uploads\/2020\/01\/Meiyan-Wang-and-Rusty-Gage.jpg 1500w\" sizes=\"auto, (max-width: 458px) 100vw, 458px\" \/><figcaption class=\"wp-caption-text\">From left: Meiyan Wang and Rusty Gage.<\/p>\n<p><a href=\"https:\/\/www.salk.edu\/wp-content\/uploads\/2020\/01\/Meiyan-Wang-and-Rusty-Gage.jpg\">Click here<\/a> for a high-resolution image.<\/p>\n<p>Credit: Salk Institute<\/figcaption><\/figure>\n<p>\u201cWhat the new results are telling us is that cells from people with macrocephalic autism not only proliferate more, but also naturally experience more replication stress,\u201d says Meiyan Wang, a graduate student in the Gage lab and first author of the new paper.<\/p>\n<p>Fast proliferation of NPCs may lead to both macrocephaly and cellular stress that spurs DNA damage, she says.\u00a0 That damage could be one source of mutations associated with ASD. While the technology used in the study told the researchers where DNA damage occurred, they don\u2019t know how much of that damage was repaired before cells matured into adult neurons and how much of it leads to lasting mutations.<\/p>\n<p>\u201cWe\u2019d like to look deeper at how replication stress and DNA damage affects neuronal function in the long term and whether adult neurons arising from these stem cells have more mutations than usual,\u201d says Wang.<\/p>\n<p>Other researchers on the paper were Christina Lim, Iryna Gallina, Sara Marshall and Maria Marchetto of Salk and Pei-Chi Wei and Frederick Alt of Boston Children\u2019s Hospital.<\/p>\n<p>The work and researchers involved were supported by grants from the California Institute for Regenerative Medicine, an AHA-Allen Initiative in Brain Health and Cognitive Impairment award made jointly through the American Heart Association and The Paul G. Allen Frontiers Group, the National Institutes of Health, the JPB Foundation, the Leona M. and Harry B. Helmsley Charitable Trust, Annette C. Merle-Smith, the Robert and Mary Jane Engmann Foundation, the March of Dimes, the Harvard Brain Initiative, the Charles H. Hood Foundation, the Charles A. King Trust Postdoctoral Research Fellowship Program, Bank of America, and the Howard Hughes Medical Institute.<\/p>","protected":false},"featured_media":25593,"template":"","faculty":[76],"disease-research":[169,124],"class_list":["post-25567","disclosure","type-disclosure","status-publish","has-post-thumbnail","hentry","faculty-rusty-gage","disease-research-autism","disease-research-neuroscience-and-neurological-disorders"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.3 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Salk scientists link rapid brain growth in autism to DNA damage - Salk Institute for Biological Studies<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.salk.edu\/zh\/news-release\/salk-scientists-link-rapid-brain-growth-in-autism-to-dna-damage\/\" \/>\n<meta property=\"og:locale\" content=\"zh_CN\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Salk scientists link rapid brain growth in autism to DNA damage - Salk Institute for Biological Studies\" \/>\n<meta property=\"og:description\" content=\"LA JOLLA\u2014Researchers at the Salk Institute have discovered a unique pattern of DNA damage that arises in brain cells derived from individuals with a macrocephalic form of autism spectrum disorder (ASD). 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Lim, Iryna S. Gallina, Sara Marshall, Maria C. Marchetto, Frederick W. Alt and Fred H. 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