Downloaded from molecularcasestudies.cshlp.org on September 30, 2021 - Published by Cold Spring Harbor Laboratory Press Molecular Case Study Research Report Title: KBG syndrome involving a single nucleotide duplication in ANKRD11 Authors: Robert Kleyner1*, Janet Malcolmson1,2*, David Tegay1, Kenneth Ward3, Annette Maughan4, Glenn Maughan5, Lesa Nelson3, Kai Wang6,7,8, Reid Robison8, Gholson J. Lyon1,8,# 1Stanley Institute for Cognitive Genomics, One Bungtown Road, Cold Spring Harbor Laboratory, Cold Spring Harbor, NY, USA; 2Genetic Counseling Graduate Program, Long Island University (LIU), 720 Northern Boulevard, Brookville, NY 11548; 3Affiliated Genetics, Inc. 2749 East Parleys Way Suite 100 Salt Lake City, UT 84109; 4Epilepsy Association of Utah, 8539 So. Redwood Rd., West Jordan, UT. 84088; 5KBG Syndrome Foundation, 8539 So. Redwood Rd., West Jordan, UT. 84088; 6Zilkha Neurogenetic Institute, University of Southern California, Los Angeles, CA 90089, US; 7Department of Psychiatry & Behavioral Sciences, Keck School of Medicine, University of Southern California, Los Angeles, CA 90033, USA; 8Utah Foundation for Biomedical Research, Salt Lake City, UT *These authors contributed equally to this work. #To whom correspondence should be addressed: Email:
[email protected] Downloaded from molecularcasestudies.cshlp.org on September 30, 2021 - Published by Cold Spring Harbor Laboratory Press ABSTRACT KBG syndrome is a rare autosomal dominant genetic condition characterized by neurological involvement and distinct facial, hand and skeletal features. Over 70 cases have been reported; however, it is likely that KBG syndrome is underdiagnosed due to lack of comprehensive characterization of the heterogeneous phenotypic features. We describe the clinical manifestations in a male currently at 13 years of age, who exhibited symptoms including epilepsy, severe developmental delay, distinct facial features and hand anomalies, without a positive genetic diagnosis.