Sangam: A Confluence of Knowledge Streams

Male carriers of the FMR1 premutation show altered hippocampal-prefrontal function during memory encoding

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dc.contributor McGovern Institute for Brain Research at MIT
dc.contributor Koldewyn, Kami
dc.creator Wang, John M.
dc.creator Koldewyn, Kami
dc.creator Hashimoto, Ryu-ichiro
dc.creator Schneider, Andrea
dc.creator Le, Lien
dc.creator Tassone, Flora
dc.creator Cheung, Katherine
dc.creator Hagerman, Paul
dc.creator Hessl, David
dc.creator Rivera, Susan M.
dc.date 2013-01-08T15:53:13Z
dc.date 2013-01-08T15:53:13Z
dc.date 2012-10
dc.date 2012-08
dc.date.accessioned 2023-03-01T18:11:54Z
dc.date.available 2023-03-01T18:11:54Z
dc.identifier 1662-5161
dc.identifier http://hdl.handle.net/1721.1/76189
dc.identifier Wang, John M. et al. “Male Carriers of the FMR1 Premutation Show Altered Hippocampal-Prefrontal Function During Memory Encoding.” Frontiers in Human Neuroscience 6 (2012): 2-13. Web.
dc.identifier.uri http://localhost:8080/xmlui/handle/CUHPOERS/279119
dc.description Previous functional MRI (fMRI) studies have shown that fragile X mental retardation 1 (FMR1) fragile X premutation allele carriers (FXPCs) exhibit decreased hippocampal activation during a recall task and lower inferior frontal activation during a working memory task compared to matched controls. The molecular characteristics of FXPCs includes 55–200 CGG trinucleotide expansions, increased FMR1 mRNA levels, and decreased FMRP levels especially at higher repeat sizes. In the current study, we utilized MRI to examine differences in hippocampal volume and function during an encoding task in young male FXPCs. While no decreases in either hippocampal volume or hippocampal activity were observed during the encoding task in FXPCs, FMRP level (measured in blood) correlated with decreases in parahippocampal activation. In addition, activity in the right dorsolateral prefrontal cortex during correctly encoded trials correlated negatively with mRNA levels. These results, as well as the established biological effects associated with elevated mRNA levels and decreased FMRP levels on dendritic maturation and axonal growth, prompted us to explore functional connectivity between the hippocampus, prefrontal cortex, and parahippocampal gyrus using a psychophysiological interaction analysis. In FXPCs, the right hippocampus evinced significantly lower connectivity with right ventrolateral prefrontal cortex (VLPFC) and right parahippocampal gyrus. Furthermore, the weaker connectivity between the right hippocampus and VLPFC was associated with reduced FMRP in the FXPC group. These results suggest that while FXPCs show relatively typical brain response during encoding, faulty connectivity between frontal and hippocampal regions may have subsequent effects on recall and working memory.
dc.description National Institutes of Health (U.S.) (grant MH078041)
dc.description National Institutes of Health (U.S.) (grant MH77554)
dc.description National Institutes of Health (U.S.) (grant HD02274 )
dc.format application/pdf
dc.language en_US
dc.publisher Frontiers Research Foundation
dc.relation http://dx.doi.org/10.3389/fnhum.2012.00297
dc.relation Frontiers in Human Neuroscience
dc.rights Article is made available in accordance with the publisher's policy and may be subject to US copyright law. Please refer to the publisher's site for terms of use.
dc.source Frontiers Research Foundation
dc.title Male carriers of the FMR1 premutation show altered hippocampal-prefrontal function during memory encoding
dc.type Article
dc.type http://purl.org/eprint/type/JournalArticle


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