New! Sign up for our free email newsletter.
Science News
from research organizations

Three genes associated with neurodevelopmental disorders identified

Date:
November 28, 2023
Source:
Children's Hospital of Philadelphia
Summary:
Researchers have identified how three novel genes cause neurodevelopmental disorders. Researchers now have a better sense of the genes' roles in human brain development and function and their ability to serve as potential therapeutic targets in the future.
Share:
FULL STORY

An international study group led by researchers of Children's Hospital of Philadelphia (CHOP) have identified how three novel genes cause neurodevelopmental disorders. Researchers now have a better sense of the genes' roles in human brain development and function and their ability to serve as potential therapeutic targets in the future. The findings were recently published online by the Journal of Clinical Investigation.

Over the last couple of decades, researchers have identified more than 1500 genes in different signaling pathways associated with neurodevelopmental disorders. On average, about one third of patients with neurodevelopmental disorders receive a genetic diagnosis. However, little is known about how these genes are networked and how their malfunction leads to these disorders.

Prior research in other disorders has shown that issues related to gene splicing may be to blame. Before being turned into proteins, genes are transcribed into introns, or strands of RNA that do not code for proteins, and exons that code for proteins. Introns are removed in a process called splicing, which is carried out by a protein complex called the spliceosome. Variants impacting the spliceosome have rarely been implicated with neurodevelopmental disorders. However, through a series of complex testing, researchers in this study showed that malfunctions in the spliceosome are responsible for some neurodevelopmental disorders.

"Using multiple techniques, including phenotyping, genomic sequencing and modeling in fly and stem cells, we were able to map the genetic architecture of three genes associated with neurodevelopmental disorders, particularly developmental delay, intellectual disability and autism," said Dong Li, Ph.D., a research faculty member in the Center for Applied Genomics and the Division of Human Genetics at CHOP and lead author on the study. "Combining fly and human genetics helped us understand the mechanisms of how variants of these genes affect the machinery of the spliceosome and cause these disorders."

In this study, researchers utilized genomic and clinical data from unrelated patients with neurodevelopmental disorders. Among the cohort, 46 patients had missense variants of the gene U2AF2 and six patients had variants of the gene PRPF19. In human stem cell and fly models, the researchers noticed issues with the formation of neurites, or protrusions on neurons that give them their shape, as well as issues with splicing and social deficits in the fly models. Deeper profiling revealed that at third gene, RBFOX1, had missense variants that affected splicing and loss of proper neuron function. These findings were later compared with those of patients in the study, which confirmed that variants in the three genes can lead to neurodevelopmental disorders.

"We used fruit flies to study the effects of losing the function of these three genes one at a time and found that two genes independently led to brain structural and functional abnormalities, highlighting the essentiality of these genes in development," said study co-author Yuanquan Song, Ph.D., an associate professor from the Department of Pathology & Laboratory Medicine at CHOP. "Apart from identifying patients with such variants in these genes for the first time, our extended translational modeling study efforts aimed to determine the underlying functions for these variants further elucidated their clinical relevance."

"Not only does this study identify three causative genes associated with neurodevelopmental disorders, but it helps us understand how critical pre-mRNA splicing is to the development of the central nervous system," said senior study author Hakon Hakonarson, M.D., Ph.D., director of the Center for Applied Genomics at CHOP.


Story Source:

Materials provided by Children's Hospital of Philadelphia. Note: Content may be edited for style and length.


Journal Reference:

  1. Dong Li, Qin Wang, Allan Bayat, Mark R. Battig, Yijing Zhou, Daniëlle G.M. Bosch, Gijs van Haaften, Leslie Granger, Andrea K. Petersen, Luis A. Pérez-Jurado, Gemma Aznar-Laín, Anushree Aneja, Miroslava Hancarova, Sarka Bendova, Martin Schwarz, Radka Kremlíková Pourová, Zdenek Sedlacek, Beth A. Keena, Michael E. March, Cuiping Hou, Nora O'Connor, Elizabeth J. Bhoj, Margaret H. Harr, Gabrielle Lemire, Kym M. Boycott, Meghan C. Towne, Megan Li, Mark Tarnopolsky, Lauren Brady, Michael J. Parker, Hanna Faghfoury, Lea Kristin Parsley, Emanuele Agolini, Maria Lisa Dentici, Antonio Novelli, Meredith S. Wright, Rachel Palmquist, Khanh Lai, Marcello Scala, Pasquale Striano, Michele Iacomino, Federico Zara, Annina Cooper, Timothy J. Maarup, Melissa Byler, Robert Roger Lebel, Tugce B. Balci, Raymond J. Louie, Michael J. Lyons, Jessica Douglas, Catherine B. Nowak, Alexandra Afenjar, Juliane Hoyer, Boris Keren, Saskia M. Maas, Mahdi M. Motazacker, Julian A. Martinez-Agosto, Ahna M. Rabani, Elizabeth M. McCormick, Marni Falk, Sarah M. Ruggiero, Ingo Helbig, Rikke S. Møller, Lino Tessarollo, Francesco Tomassoni-Ardori, Mary Ellen Palko, Tzung-Chien Hsieh, Peter M. Krawitz, Mythily Ganapathi, Bruce D. Gelb, Vaidehi Jobanputra, Ashley Wilson, John Greally, Sébastien Jacquemont, Khadijé Jizi, Bruel Ange-Line, Chloé Quelin, Vinod K. Misra, Erika Chick, Corrado Romano, Donatella Greco, Alessia Arena, Manuela Morleo, Vincenzo Nigro, Rie Seyama, Yuri Uchiyama, Naomichi Matsumoto, Ryoji Taira, Katsuya Tashiro, Yasunari Sakai, Gökhan Yigit, Bernd Wollnik, Michael Wagner, Barbara Kutsche, Anna C.E. Hurst, Michelle L. Thompson, Ryan J. Schmidt, Linda M. Randolph, Rebecca C. Spillmann, Vandana Shashi, Edward J. Higginbotham, Dawn Cordeiro, Amanda Carnevale, Gregory Costain, Tayyaba Khan, Benoît Funalot, Frederic Tran Mau-Them, Luis Fernandez Garcia Moya, Sixto García-Miñaúr, Matthew Osmond, Lauren Chad, Nada Quercia, Diana Carrasco, Chumei Li, Amarilis Sanchez-Valle, Meghan Kelley, Mathilde Nizon, Brynjar O. Jensson, Patrick Sulem, Kari Stefansson, Svetlana Gorokhova, Tiffany Busa, Marlène Rio, Hamza Hadj Abdallah, Marion Lesieur-Sebellin, Jeanne Amiel, Véronique Pingault, Sandra Mercier, Marie Vincent, Christophe Philippe, Clemence Fatus-Fauconnier, Kathryn Friend, Rebecca K. Halligan, Sunita Biswas, Jane M.R. Rosser, Cheryl Shoubridge, Mark A. Corbett, Christopher Barnett, Jozef Gecz, Kathleen A. Leppig, Anne Slavotinek, Carlo Marcelis, Rolph Pfundt, Bert B.A. de Vries, Marjon A. van Slegtenhorst, Alice S. Brooks, Benjamin Cogne, Thomas Rambaud, Zeynep Tümer, Elaine H. Zackai, Naiara Akizu, Yuanquan Song, Hakon Hakonarson. Spliceosome malfunction causes neurodevelopmental disorders with overlapping features. Journal of Clinical Investigation, 2023; DOI: 10.1172/JCI171235

Cite This Page:

Children's Hospital of Philadelphia. "Three genes associated with neurodevelopmental disorders identified." ScienceDaily. ScienceDaily, 28 November 2023. <www.sciencedaily.com/releases/2023/11/231128132340.htm>.
Children's Hospital of Philadelphia. (2023, November 28). Three genes associated with neurodevelopmental disorders identified. ScienceDaily. Retrieved February 22, 2024 from www.sciencedaily.com/releases/2023/11/231128132340.htm
Children's Hospital of Philadelphia. "Three genes associated with neurodevelopmental disorders identified." ScienceDaily. www.sciencedaily.com/releases/2023/11/231128132340.htm (accessed February 22, 2024).

Explore More
from ScienceDaily

RELATED STORIES