A fine structural study of the hippocampus and dorsal root ganglion in mouse trisomy 16, a model of Down's syndrome

Cell Biology International
N J LaneS I Rapoport

Abstract

Mouse trisomy 16 (Ts16) appears to provide an animal model of Down's syndrome in that a portion of mouse chromosome 16 is syntenic with part of human chromosome 21. Trisomy 21 in human beings leads to the mental retardation of Down's syndrome and in middle age, to some presenile anatomic and clinical features of Alzheimer's disease. Neural tissue from aging Ts16 mice is unavailable, however, as Ts16 mouse embryos die late in utero. We studied these embryos looking at the ultrastructure of neurons from the hippocampus and dorsal root ganglion in normal control mice embryos (diploid) and in Ts16 late embryonic litter mates after day 15 of gestation. The organelles in the Ts16 neurons looked similar to those in control neurons, fixed and processed under similar conditions. No obvious neuropathological structures were observed. These results, when compared to reports on electrophysiological abnormalities of cultured fetal Ts16 neurons and on abnormalities in neurotransmitter markers in the Ts16 fetal brain, lead us to suggest that the mental retardation of Down's syndrome is likely to result from functional and chemical defects not directly related to abnormal neuronal ultrastructure. When related to fine structural studies of tran...Continue Reading

Citations

Jun 4, 1999·Trends in Genetics : TIG·D Hernandez, E M Fisher
Apr 3, 2001·Free Radical Biology & Medicine·S Schuchmann, U Heinemann
May 5, 2001·Brain Research. Brain Research Reviews·Z GaldzickiS I Rapoport
May 21, 2005·Developmental Dynamics : an Official Publication of the American Association of Anatomists·Alexander W LangeKatherine E Yutzey
Jul 17, 1998·Pediatric Research·M Garcia-RamírezL Audi
Jan 26, 2018·PLoS Biology·Nick Lane
Apr 13, 1999·International Journal of Developmental Neuroscience : the Official Journal of the International Society for Developmental Neuroscience·T StahlV Bigl

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