Santhosh Girirajan

Professor of Genomics; Interim Department Head of Biochemistry and Molecular Biology; Professor of Anthropology

Santhosh Girirajan

Research Summary

Understanding the genetic basis of neurodevelopmental disorders.

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Publication Tags

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Genes Phenotype Autistic Disorder Copy Number Variation Neurodevelopmental Disorders Intellectual Disability Mothers Schizophrenia Genetics Heart Diseases Heart Mutation Drosophila Melanogaster Genome Gene Autism Spectrum Disorder Pathogenicity Autism Exome Progeny Comorbidity Epigenetics Epigenomics Datasets 15q11.2

Most Recent Publications

Strategies for dissecting the complexity of neurodevelopmental disorders

Jiawan Sun, Serena Noss, Deepro Banerjee, Maitreya Das, Santhosh Girirajan, 2024, Trends in Genetics on p. 187-202

Assortative mating and parental genetic relatedness contribute to the pathogenicity of variably expressive variants

Corrine Smolen, Matthew Jensen, Lisa Dyer, Lucilla Pizzo, Anastasia Tyryshkina, Deepro Banerjee, Laura Rohan, Emily Huber, Laila El Khattabi, Paolo Prontera, Jean Hubert Caberg, Anke Van Dijck, Charles Schwartz, Laurence Faivre, Patrick Callier, Anne Laure Mosca-Boidron, Mathilde Lefebvre, Kate Pope, Penny Snell, Paul J. Lockhart, Lucia Castiglia, Ornella Galesi, Emanuela Avola, Teresa Mattina, Marco Fichera, Giuseppa Maria Luana Mandarà, Maria Grazia Bruccheri, Olivier Pichon, Cedric Le Caignec, Radka Stoeva, Silvestre Cuinat, Sandra Mercier, Claire Bénéteau, Sophie Blesson, Ashley Nordsletten, Dominique Martin-Coignard, Erik Sistermans, R. Frank Kooy, David J. Amor, Corrado Romano, Bertrand Isidor, Jane Juusola, Santhosh Girirajan, 2023, American Journal of Human Genetics on p. 2015-2028

Challenges and considerations for reproducibility of STARR-seq assays

Maitreya Das, Ayaan Hossain, Deepro Banerjee, Craig Alan Praul, Santhosh Girirajan, 2023, Genome Research on p. 479-495

Genome-wide analysis of copy-number variation in humans with cleft lip and/or cleft palate identifies COBLL1, RIC1, and ARHGEF38 as clefting genes

Lisa A. Lansdon, Amanda Dickinson, Sydney Arlis, Huan Liu, Arman Hlas, Alyssa Hahn, Greg Bonde, Abby Long, Jennifer Standley, Anastasia Tyryshkina, George Wehby, Nanette R. Lee, Sandra Daack-Hirsch, Karen Mohlke, Santhosh Girirajan, Benjamin W. Darbro, Robert A. Cornell, Douglas W. Houston, Jeffrey C. Murray, J. Robert Manak, 2023, American Journal of Human Genetics on p. 71-91

Pathogenic Variants and Ascertainment: Neuropsychiatric Disease Risk in a Health System Cohort

Deepro Banerjee, Santhosh Girirajan, 2023, American Journal of Psychiatry on p. 11-13

Artificial gravity partially protects space-induced neurological deficits in Drosophila melanogaster

Siddhita D. Mhatre, Janani Iyer, Juli Petereit, Roberta M. Dolling-Boreham, Anastasia Tyryshkina, Amber M. Paul, Rachel Gilbert, Matthew Jensen, Rebekah J. Woolsey, Sulekha Anand, Marianne B. Sowa, David R. Quilici, Sylvain V. Costes, Santhosh Girirajan, Sharmila Bhattacharya, 2022, Cell Reports

The gene dose makes the disease

Corrine Smolen, Santhosh Girirajan, 2022, Cell on p. 2850-2852

Neurodevelopmental copy-number variants: A roadmap to improving outcomes by uniting patient advocates, researchers, and clinicians for collective impact

Elizabeth Buttermore, Stormy Chamberlain, Jannine Cody, Gregory Costain, Louis Dang, Andrew DeWoody, Yssa DeWoody, Kira Dies, Evan Eichler, Santhosh Girirajan, Marie Gramm, Alycia Halladay, Dennis Lal, Matthew Lalli, Tess Levy, Glennis Logsdon, Daniel Lowenstein, Heather Mefford, Jennifer Mulle, Alysson Muotri, Melissa Murphy, Eduardo Perez Palma, Stefan Pinter, Rebecca Pollak, Ryan Purcell, Rodney Samaco, Bina Shah, Karun Singh, Joyce So, Maria Sundberg, Surabi Veeraragavan, Vanessa Vogel-Farley, Anthony Wynshaw-Boris, 2022, American Journal of Human Genetics on p. 1353-1365

A general framework for identifying oligogenic combinations of rare variants in complex disorders

Vijay Kumar Pounraja, Santhosh Girirajan, 2022, Genome Research on p. 904-915

Implications of the first complete human genome assembly

Can Alkan, Lucia Carbone, Megan Dennis, Jason Ernst, Gilad Evrony, Santhosh Girirajan, Danny Chi Yeu Leung, Clooney C.Y. Cheng, David MacAlpine, Ting Ni, Michèle Ramsay, Helen Rowe, Poppy Gould, Rocio Enriquez-Gasca, Beth Sullivan, 2022, Genome Research on p. 595-598

Most-Cited Papers

R47H variant of TREM2 associated with Alzheimer disease in a large late-onset family clinical, genetic, and neuropathological study

Olena Korvatska, James B. Leverenz, Suman Jayadev, Pamela McMillan, Irina Kurtz, Xindi Guo, Malia Rumbaugh, Mark Matsushita, Santhosh Girirajan, Michael O. Dorschner, Kostantin Kiianitsa, Chang En Yu, Zoran Brkanac, Gwenn A. Garden, Wendy H. Raskind, Thomas D. Bird, 2015, JAMA Neurology on p. 920-927

Rare variants in the genetic background modulate cognitive and developmental phenotypes in individuals carrying disease-associated variants

Lucilla Pizzo, Matthew Jensen, Andrew Polyak, Jill A. Rosenfeld, Katrin Mannik, Arjun Krishnan, Elizabeth McCready, Olivier Pichon, Cedric Le Caignec, Anke Van Dijck, Kate Pope, Els Voorhoeve, Jieun Yoon, Paweł Stankiewicz, Sau Wai Cheung, Damian Pazuchanics, Emily Huber, Vijay Kumar, Rachel L. Kember, Francesca Mari, Aurora Curró, Lucia Castiglia, Ornella Galesi, Emanuela Avola, Teresa Mattina, Marco Fichera, Luana Mandarà, Marie Vincent, Mathilde Nizon, Sandra Mercier, Claire Bénéteau, Sophie Blesson, Dominique Martin-Coignard, Anne Laure Mosca-Boidron, Jean Hubert Caberg, Maja Bucan, Susan Zeesman, Małgorzata J.M. Nowaczyk, Mathilde Lefebvre, Laurence Faivre, Patrick Callier, Cindy Skinner, Boris Keren, Charles Perrine, Paolo Prontera, Nathalie Marle, Alessandra Renieri, Alexandre Reymond, R. Frank Kooy, Bertrand Isidor, Charles Schwartz, Corrado Romano, Erik Sistermans, David J. Amor, Joris Andrieux, Santhosh Girirajan, 2019, Genetics in Medicine on p. 816-825

Comorbidity of intellectual disability confounds ascertainment of autism: Implications for genetic diagnosis

Andrew Polyak, Richard M. Kubina, Santhosh Girirajan, 2015, American Journal of Medical Genetics, Part B: Neuropsychiatric Genetics on p. 600-608

Epigenetics of autism-related impairment: Copy number variation and maternal infection

Varvara Mazina, Jennifer Gerdts, Sandy Trinh, Katy Ankenman, Tracey Ward, Megan Y. Dennis, Santhosh Girirajan, Evan E. Eichler, Raphael Bernier, 2015, Journal of Developmental and Behavioral Pediatrics on p. 61-67

An assessment of sex bias in neurodevelopmental disorders

Andrew Polyak, Jill A. Rosenfeld, Santhosh Girirajan, 2015, Genome Medicine

De Novo and Rare Variants at Multiple Loci Support the Oligogenic Origins of Atrioventricular Septal Heart Defects

James R. Priest, Kazutoyo Osoegawa, Nebil Mohammed, Vivek Nanda, Ramendra Kundu, Kathleen Schultz, Edward J. Lammer, Santhosh Girirajan, Todd Scheetz, Daryl Waggott, Francois Haddad, Sushma Reddy, Daniel Bernstein, Trudy Burns, Jeffrey D. Steimle, Xinan H. Yang, Ivan P. Moskowitz, Matthew Hurles, Richard P. Lifton, Debbie Nickerson, Michael Bamshad, Evan E. Eichler, Seema Mital, Val Sheffield, Thomas Quertermous, Bruce D. Gelb, Michael Portman, Euan A. Ashley, 2016, PLoS Genetics on p. e1005963

Rare copy number variation in cerebral palsy

Gai McMichael, Santhosh Girirajan, Andres Moreno-De-Luca, Jozef Gecz, Chloe Shard, Lam Son Nguyen, Jillian Nicholl, Catherine Gibson, Eric Haan, Evan Eichler, Christa Lese Martin, Alastair MacLennan, 2014, European Journal of Human Genetics on p. 40-45

Quantitative assessment of eye phenotypes for functional genetic studies using Drosophila melanogaster

Janani Iyer, Qingyu Wang, Thanh Le, Lucilla Pizzo, Sebastian Grönke, Surendra S. Ambegaokar, Yuzuru Imai, Ashutosh Srivastava, Beatriz Llamusí Troisí, Graeme Mardon, Ruben Artero, George R. Jackson, Adrian M. Isaacs, Linda Partridge, Bingwei Lu, Justin P. Kumar, Santhosh Girirajan, 2016, G3: Genes, Genomes, Genetics on p. 1427-1437

Parental Origin of Interstitial Duplications at 15q11.2-q13.3 in Schizophrenia and Neurodevelopmental Disorders

Anthony R. Isles, Andrés Ingason, Chelsea Lowther, James Walters, Micha Gawlick, Gerald Stöber, Elliott Rees, Joanna Martin, Rosie B. Little, Harry Potter, Lyudmila Georgieva, Lucilla Pizzo, Norio Ozaki, Branko Aleksic, Itaru Kushima, Masashi Ikeda, Nakao Iwata, Douglas F. Levinson, Pablo V. Gejman, Jianxin Shi, Alan R. Sanders, Jubao Duan, Joseph Willis, Sanjay Sisodiya, Gregory Costain, Thomas M. Werge, Franziska Degenhardt, Ina Giegling, Dan Rujescu, Stefan J. Hreidarsson, Evald Saemundsen, Joo Wook Ahn, Caroline Ogilvie, Santhosh D. Girirajan, Hreinn Stefansson, Kari Stefansson, Michael C. O’Donovan, Michael J. Owen, Anne Bassett, George Kirov, 2016, PLoS Genetics

Novel metrics to measure coverage in whole exome sequencing datasets reveal local and global non-uniformity

Qingyu Wang, Cooduvalli S. Shashikant, Matthew Jensen, Naomi S. Altman, Santhosh Girirajan, 2017, Scientific Reports

News Articles Featuring Santhosh Girirajan

Apr 23, 2024

Penn State molecular biologist Ross Hardison named an AAAS Fellow

Ross Hardison, Academy Professor and professor emeritus of biochemistry and molecular biology, has been named a fellow of the American Association for the Advancement of Science (AAAS).

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Feb 14, 2024

Penn State molecular biologist Joseph Reese named distinguished professor

Joseph Reese, professor of biochemistry and molecular biology, has been selected to receive the title of Distinguished Professor of Biochemistry and Molecular Biology

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Feb 07, 2024

Predicting neurodevelopmental disease in children from parent’s traits

Predicting the trajectory of neurodevelopmental and psychiatric disorders like autism or schizophrenia is difficult because they can be influenced by many different genetic and environmental factors

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Feb 07, 2024

Parental Traits May Influence Neurodevelopmental Disorders

Researchers revealed that evaluating parental traits for neurodevelopmental and psychiatric disorders offers a more precise prediction for these conditions in children than genetic testing alone

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Jan 15, 2024

Honors for Booker, Girirajan, Llinás

3 Penn State researchers have received awards and new titles

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Oct 03, 2023

Girirajan named T. Ming Chu Professor of Biochemistry and Molecular Biology

Santhosh Girirajan, professor and interim head of the Penn State Department of Biochemistry and Molecular Biology, has been named the T. Ming Chu Professor of Biochemistry and Molecular Biology.

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Jul 06, 2023

Partner selection may amplify rare variants in children

Partners who share similar traits of a given condition, such as autism, may concentrate rare genetic variants in their children, increasing the likelihood of having a child with that condition, according to a new preprint.

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Jun 12, 2023

Penn State announces tenure-line faculty promotions, effective July 1, 2023

The following is a list of academic promotions for tenured and tenure-line faculty members at Penn State, effective July 1, 2023.

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May 18, 2023

Genetic background sways effects of autism-linked mutation

An autism-linked mutation disrupts the development of clusters of brain cells, or brain organoids, generated from autistic people but displays significantly less of an effect in organoids produced from neurotypical donors, a new study finds.

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Apr 19, 2023

U.S. study charts changing prevalence of profound and non-profound autism

More than a quarter of autistic 8-year-olds in the United States have profound autism, according to a study published today in Public Health Reports. Although the overall prevalence of profound autism in this age group increased from 2002 to 2016, the prevalence of non-profound autism did so at a sharper rate, the findings show.

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Jan 26, 2023

Autism rates have tripled. Is it now more common or are we just better at diagnosis?

Autism rates tripled among children in the New York and New Jersey metropolitan area from 2000 to 2016, according to a study published Thursday in the journal Pediatrics.

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Jan 26, 2023

Autism rates have tripled. Is it now more common or are we just better at diagnosis?

New research suggests doctors have improved at identifying autism, especially among children with average or above-average IQs. But that doesn't fully explain the trend.

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Jun 24, 2020

Genes affecting brains and brawn?

Genes located in "copy number variants" (CNVs) — parts of chromosomes that are missing in some individuals and duplicated in others — that are associated with neurodevelopmental disorders affect more than just brain development, according to new research..

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Sep 26, 2019

Apparent new rise in autism may not reflect true prevalence

New statistics on autism prevalence in the United States suggest a dramatic rise in the number of children with the condition. But it is unlikely that these numbers reflect a true rise in prevalence, experts say.

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Aug 19, 2019

Researchers Create Mini Livers To Test Disease Progression

Scientists have bioengineered miniature human livers – possibly for the first time. The livers were created by University of Pittsburgh researchers in an effort to move away from less reliable experiments on mouse livers.

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Aug 19, 2019

Pa. researchers create mini livers to test disease progression

Scientists have bioengineered miniature human livers - possibly for the first time. The livers were created by University of Pittsburgh researchers in an effort to move away from less reliable experiments on mouse livers.

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Jul 30, 2019

Bioinformatics and Genomics Student Inspires Journal Cover

The July 2019 issue of Genome Research features art inspired by the work of Penn State graduate student Vijay Kumar Pounraja.

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Jul 09, 2019

New method helping to find deletions and duplications in the human genome

A new machine-learning method accurately identifies regions of the human genome that have been duplicated or deleted — known as copy number variants — that are often associated with autism and other neurodevelopmental disorders. The new method, developed by researchers at Penn State, integrates data from several algorithms that attempt to identify copy number variants from exome-sequencing data — high-throughput DNA sequencing of only the protein-coding regions of the human genome.

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Sep 19, 2018

Family's 'Genetic Background' Sheds Light On Autism Symptoms

The total amount of rare mutations—deletions, duplications, or other changes to the DNA sequence—in a person’s genome can explain why individuals with a disease-associated mutation can have vastly different symptoms, according to new research.

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Sep 10, 2018

Family Genetics Key to Severity of Autism and Other Neurodevelopmental Disorders

A major international research effort headed by a team at the Pennsylvania State University now reports study data indicating that while the primary risk variant may make an individual more susceptible to developing a particular disorder, such as ASD, the variability and severity of symptoms will depend on their genetic background of accumulated rare mutations—such as deletions and duplications—which have been inherited from parents and grandparents.

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