PMID- 26381810 OWN - NLM STAT- MEDLINE DCOM- 20160808 LR - 20181113 IS - 1538-6724 (Electronic) IS - 0031-9023 (Print) IS - 0031-9023 (Linking) VI - 96 IP - 4 DP - 2016 Apr TI - BDNF Val66Met Polymorphism Is Related to Motor System Function After Stroke. PG - 533-9 LID - 10.2522/ptj.20150135 [doi] AB - BACKGROUND: The val(66)met polymorphism in brain-derived neurotrophic factor (BDNF) has been associated with poorer outcomes after stroke. The mechanism for this finding remains uncertain but might be related to the reduced motor system activation associated with this polymorphism in healthy people. OBJECTIVE: The current study examined whether the presence of the BDNF val(66)met polymorphism is associated with reduced motor system activation after stroke. DESIGN AND METHODS: Forty-two patients with stroke who were enrolled in 1 of 2 studies of robot-assisted arm motor therapy participated in the study. All participants were tested for the BDNF val(66)met polymorphism followed by functional magnetic resonance imaging during affected hand movement. RESULTS: Participants averaged 12 months poststroke and had wide-ranging motor deficits (Fugl-Meyer scale scores=14-60). Brain activation in participants without the BDNF val(66)met polymorphism (n=26) spanned bilateral motor networks with a larger volume (total=334 cc) than that found in participants with this polymorphism (n=16) (97 cc). Regional analyses were consistent. Participants without this polymorphism showed larger ipsilesional primary sensorimotor cortex activation volume and magnitude compared with those in whom the polymorphism was present. LIMITATIONS: The extent to which these findings generalize to other populations of people with stroke, such as those with stroke <7 days prior, remains uncertain. CONCLUSIONS: Functional magnetic resonance imaging during affected hand movement showed decreased brain activation among participants with the BDNF val(66)met polymorphism compared with those lacking this polymorphism, especially in the ipsilesional primary sensorimotor cortex contralateral to movement. These results echo findings in healthy people and suggest that genetic factors affecting the normal brain continue to be operative after stroke. The findings suggest a potential imaging-based endophenotype for the BDNF val(66)met polymorphism's effect on the motor system that may be useful in a clinical trial setting. CI - (c) 2016 American Physical Therapy Association. FAU - Kim, Dae Yul AU - Kim DY AD - D.Y. Kim, MD, Department of Rehabilitation, University of Ulsan, Ulsan, Korea. FAU - Quinlan, Erin B AU - Quinlan EB AD - E.B. Quinlan, PhD, Department of Neurology, University of California at Irvine, Irvine, California. FAU - Gramer, Robert AU - Gramer R AD - R. Gramer, BA, Department of Neurology, University of California at Irvine. FAU - Cramer, Steven C AU - Cramer SC AD - S.C. Cramer, MD, MMSc, Department of Neurology, University of California at Irvine, Hewitt Hall, Room 1331, Mail Code 1385, Irvine, CA 92697 (USA). scramer@uci.edu. LA - eng GR - R01 NS059909/NS/NINDS NIH HHS/United States GR - K24 HD074722/HD/NICHD NIH HHS/United States GR - UL1 TR000153/TR/NCATS NIH HHS/United States GR - UL1 TR001414/TR/NCATS NIH HHS/United States GR - 1K24 HD074722 01/HD/NICHD NIH HHS/United States PT - Journal Article PT - Research Support, N.I.H., Extramural DEP - 20150917 PL - United States TA - Phys Ther JT - Physical therapy JID - 0022623 RN - 0 (Brain-Derived Neurotrophic Factor) RN - 7171WSG8A2 (BDNF protein, human) SB - IM MH - Brain-Derived Neurotrophic Factor/*genetics MH - Disability Evaluation MH - Female MH - Genotype MH - Hand/physiopathology MH - Humans MH - Magnetic Resonance Imaging MH - Male MH - Middle Aged MH - *Polymorphism, Single Nucleotide MH - Recovery of Function/*genetics/physiology MH - Sensorimotor Cortex/physiopathology MH - Stroke/*genetics/physiopathology MH - *Stroke Rehabilitation PMC - PMC4817211 EDAT- 2015/09/19 06:00 MHDA- 2016/08/09 06:00 PMCR- 2016/10/01 CRDT- 2015/09/19 06:00 PHST- 2015/03/10 00:00 [received] PHST- 2015/08/28 00:00 [accepted] PHST- 2015/09/19 06:00 [entrez] PHST- 2015/09/19 06:00 [pubmed] PHST- 2016/08/09 06:00 [medline] PHST- 2016/10/01 00:00 [pmc-release] AID - ptj.20150135 [pii] AID - 2015-0135 [pii] AID - 10.2522/ptj.20150135 [doi] PST - ppublish SO - Phys Ther. 2016 Apr;96(4):533-9. doi: 10.2522/ptj.20150135. Epub 2015 Sep 17.