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Protein Expression in Down Syndrome Brain (Hardcover, 2001 ed.)
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Protein Expression in Down Syndrome Brain (Hardcover, 2001 ed.)
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When we worked on Down Syndrome brain in the past we have been
focus ing on adult brain. This was a major step forwards as most
work on Down Syndrome was carried out on fibroblasts or other
tissues and, moreover, we introduced proteomics to identify and
quantify brain protein expression. We considered evaluation of
brain protein expression in Down Syndrome brain by and by more
important than gene hunting at the nucleic acid level realiz ing
the long unpredictable way from RNA to protein. The availability of
fetal samples along with the proteomic appproach stimulated and
reinforced studies on Down Syndrome brain. And indeed, it was found
out that some observations on aberrant protein expression in adult
Down Syndrome brain could not be verified in the fetal samples indi
cating that neurodegeneration in adult Down Syndrome brain may have
been responsible rather than trisomy 21. Using brains from the
early second trimester of gestation led to the generation of a
series of clues for the under standing of aberrant wiring of the
brain in Down Syndrome and enabled the determination of altered key
functions in early life; e. g. undetectably low drebrin was
observed in Down Syndrome cortex, an integral constituent and
marker for dendritic spines, main effectors of cross-talk between
neurons. In addition, evaluation of the nature of the neuronal
deficits in terms of neuro transmission markers could be
established as well as neuronal density in fetal Down Syndrome
cortex."
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