A Noncoding, Regulatory Mutation Implicates HCFC1 in Nonsyndromic Intellectual Disability
Huang, Lingli Jolly, Lachlan A Willis-Owen, Saffron Gardner, Alison Kumar, Raman Douglas, Evelyn Shoubridge, Cheryl Wieczorek, Dagmar Tzschach, Andreas Cohen, Monika Hackett, Anna Field, Michael Froyen, Guy Hu, Hao Haas, Stefan A Ropers, Hans-Hilger Kalscheuer, Vera M Corbett, Mark A Gecz, Jozef # ×
American Society of Human Genetics
American Journal of Human Genetics vol:91 issue:4 pages:694-702
The discovery of mutations causing human disease has so far been biased toward protein-coding regions. Having excluded all annotated coding regions, we performed targeted massively parallel resequencing of the nonrepetitive genomic linkage interval at Xq28 of family MRX3. We identified in the binding site of transcription factor YY1 a regulatory mutation that leads to overexpression of the chromatin-associated transcriptional regulator HCFC1. When tested on embryonic murine neural stem cells and embryonic hippocampal neurons, HCFC1 overexpression led to a significant increase of the production of astrocytes and a considerable reduction in neurite growth. Two other nonsynonymous, potentially deleterious changes have been identified by X-exome sequencing in individuals with intellectual disability, implicating HCFC1 in normal brain function.