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Dr. Eunice  Pyun  Do image

Dr. Eunice Pyun Do

101 Bodin Cir 60Mdg/Mdossgomi
Travis Afb CA 94535
707 237-7342
Medical School: Other - Unknown
Accepts Medicare: No
Participates In eRX: No
Participates In PQRS: No
Participates In EHR: No
License #: 20A 12683
NPI: 1851575310
Taxonomy Codes:
207R00000X

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Publications

Single-channel quantitative multiplex reverse transcriptase-polymerase chain reaction for large numbers of gene products differentiates nondemented from neuropathological Alzheimer's disease. - The American journal of pathology
Effective approaches using array technologies are critical to understand the molecular bases of human diseases. The results obtained using such procedures require analysis and validation procedures that are still under development. In the context of Alzheimer's disease, in which the identification of molecular mechanisms of underlying pathologies is vital, we describe a robust assay that is the first real-time reverse transcriptase-polymerase chain reaction-based high-throughput approach that can simultaneously quantitate the expression of a large number of genes at the copy number level from a minute amount of starting material. Using this approach within the human brain, we were able to quantitate as many as 19 genes at a time with only one type of fluorescent probe. The number of genes included can be considerably increased. Examples of consistent changes in Alzheimer's disease within these 19 candidate genes included reductions in targets related to the dendritic and synaptic apparatus. These changes were specific to Alzheimer's disease when compared with Parkinson's disease cases. We also present comparison data with microarray analysis from the same brain region and the same patients. The high sensitivity and reproducibility of this technology coupled with appropriate multivariate analysis is proposed here to form a biotechnology platform that can be widely used for diagnostic purposes as well as basic research.
Defects in expression of genes related to synaptic vesicle trafficking in frontal cortex of Alzheimer's disease. - Neurobiology of disease
Loss of synapses correlates with cognitive decline in Alzheimer's disease (AD). However, molecular mechanisms underlying the synaptic dysfunction and loss are not well understood. In this study, microarray analysis of brain tissues from five AD cases revealed a reduced expression of a group of related genes, all of which are involved in synaptic vesicle (SV) trafficking. By contrast, several synaptic genes with functions other than vesicle trafficking remained unchanged. Quantitative RT-PCR confirmed and expanded the microarray findings. Furthermore, immunoblotting showed that the protein level of at least one of these gene products, dynamin I, correlated with its reduced transcript. Immunhistochemical analysis exhibited an altered distribution of dynamin I immunolabeling in AD neurons. Microarray analysis of transgenic mice with mutated amyloid precursor protein showed that although the transcript levels for some of the SV trafficking-related genes are also decreased, the change in dynamin did not replicate the AD pattern. The results suggest a link among SV vesicle-trafficking pathways, synaptic malfunction, and AD pathogenesis.Copyright 2003 Elsevier Science (USA)

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