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A t(3;9)(q25.1;q34.3) translocation leading to OLFM1 fusion transcripts in Gilles de la Tourette syndrome, OCD and ADHD

Item Type:Article
Title:A t(3;9)(q25.1;q34.3) translocation leading to OLFM1 fusion transcripts in Gilles de la Tourette syndrome, OCD and ADHD
Creators Name:Bertelsen, B. and Melchior, L. and Jensen, L.R. and Groth, C. and Nazaryan, L. and Debes, N.M. and Skov, L. and Xie, G. and Sun, W. and Brondum-Nielsen, K. and Kuss, A.W. and Chen, W. and Tuemer, Z.
Abstract:Gilles de la Tourette syndrome (GTS) is a neuropsychiatric disorder with a strong genetic etiology; however, finding of candidate genes is hampered by its genetic heterogeneity and the influence of non-genetic factors on disease pathogenesis. We report a case of a male patient with GTS, obsessive compulsive disorder, attention-deficit/hyperactivity-disorder, as well as other comorbidities, and a translocation t(3;9)(q25.1;q34.3) inherited from a mother with tics. Mate-pair sequencing revealed that the translocation breakpoints truncated the olfactomedin 1 (OLFM1) gene and two uncharacterized transcripts. Reverse-transcription PCR identified several fusion transcripts in the carriers, and OLFM1 expression was found to be high in GTS-related human brain regions. As OLFM1 plays a role in neuronal development it is a likely candidate gene for neuropsychiatric disorders and haploinsufficiency of OLFM1 could be a contributing risk factor to the phenotype of the carriers. In addition, one of the fusion transcripts may exert a dominant-negative or gain-of-function effect. OLFM1 is unlikely to be a major GTS susceptibility gene as no point mutations or copy number variants affecting OLFM1 were identified in 175 additional patients. The translocation described is thus a unique event, but further studies in larger cohorts are required to elucidate involvement of OLFM1 in GTS pathogenesis.
Keywords:Tourette Syndrome, Microscopically Balanced Translocation, Fusion Transcripts, OLFM1, Neuropsychiatric Disorder
Source:Psychiatry Research
ISSN:0165-1781
Publisher:Elsevier (Ireland)
Volume:225
Number:3
Page Range:268-275
Date:28 February 2015
Official Publication:https://doi.org/10.1016/j.psychres.2014.12.028
PubMed:View item in PubMed

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