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分子诊断 -1: Methods in Molecular Medicine 张咸宁 zhangxianning@zju.edu.cn Tel : 13105819271; 88208367 Office: C303, Teaching Building 2014/09
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Trends of Medicine in 21th Century “5P 医学 ”: Prediction 、 Prevention 、 Participation 、 Personalization 、 Precision“5P 医学 ”: Prediction 、 Prevention 、 Participation 、 Personalization 、 Precision –Treatment afterward Predictive & Preventive –Molecular epidemiology: Sub-population –Rare diseases Common diseases –General Personalized
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In times of transformation, we are all students ! ● predict individual susceptibility to disease, based on genetic, genomic, and other factors; ● provide more useful tools and individualized programs for disease prevention, based on knowledge of one’s susceptibility; ● detect the onset of disease earlier and before it is clinically evident, based on newly discovered biological markers that arise from changes at the molecular level; ● preempt disease progression, as a result of early detection; ● target medicines and their dose more precisely and safely to each patient, on the basis of a deep understanding of disease mechanism and the role that genetic and genomic factors play in the individual response to drugs. ---- Ginsburg GS, Willard HF. Essentials of Genomic and Personalized Medicine. Elsevier, 2010
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Infectious Disease Neoplastic Disease Genetic Disease Identity Testing HLA Typing Pharmacogenetics Areas of Application of Molecular Diagnosis
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China‘s birth defect (出生缺陷) rate (卫计委公布, Sep., 2012 ) Birth defect: A congenital abnormality ( 先天性 畸形 ). Not all are detected at birth or even soon after. ~5.6% ~16 million neonates (新生儿) /yr → ~900 000 affected, ~ 270 000 visible at birth
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Beijing‘s birth defect rate, 2013 ( 北京市卫计委, Sep. 11, 2014) ~14.68% for household registered neonates ~26.22% for non-household registered neonates
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Prevalence of the common monogenetic disorders in China?--- No accurate data! ~1% in living birth --- Carter CO. J M Genet 1977;14:316 The estimated affected neonates in China: ~160 000 per year !
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Human genome DNA Extraction Venous blood(5 ml) → WBC → lysing buffer (SDS) and protease K → centrifugation, collect supernatant → phenol → centrifugation, collect supernant → RNase A and T1 → phenol → centrifugation, collect supernatant → potassium acetate and EtOH (absolute) → genomic DNA appears (like cotton fiber)
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分子杂交
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Sanger (dideoxy) sequencing
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Mosaicism (嵌合体) (A) Sequence analysis of the proband revealed a hemizygous insertion mutation (LAMP2/c.808dupG; p.A270Gfx3). (B) Sequences of DNA from the proband’s mother were variable and weakly suggestive of a c.808dupG “G” peak. (C) Sequences of DNA from unrelated healthy controls were normal.
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NGS
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ASO
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dHPLC : WAVE 系统的组成 InterfacePumpDegasser Detector Column Oven Autosampler Temperature Rack
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dHPLC
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高分辨率熔解曲线分析技术( high resolution melting , HRM )
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MLPA
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Using multiplex ligation-dependent probe amplifi cation (MLPA) to identify an exon 13 deletion in the BRCA1 gene. (A) Results from a control sample. Numbered peaks represent products from each exon; peaks labeled c are control probes. (B) The same analysis on DNA from a patient with breast cancer. In comparison with the control sample, the exon 13 peak is only half the size.
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qPCR 。 A : TaqMan 技术。 B : real-time PCR 分析结果。 随着 PCR 循环次数( X 轴)的增加, PCR 产物( Y 轴,以 荧光强度表示。 Rn 即校正后的报告基因染色强度)呈指 数性增长。
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Mass Spectrometry-based Diagnostics MALDI-TOF MS : matrix-assisted laser desorption/ionization-time of flight mass spectrometry SELDI -TOF MS : surface-enhanced laser desorption/ionization- time of flight mass spectrometry
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Rosenblatt KP, et al. Annu Rev Med, 2004, 55:97–112
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Petricoin EF, et al. Trends Mol Med, 2004, 10:59–64
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荧光条形码标记的单分子检测技术 ( nCounter Analysis System ):一种高通 量检测基因表达谱、 miRNA 等分子的技术 ● Gene Expression 800 个基因分析通量 具有弹性的样品需求,适用于血液样本与 FFPE 样本 只需要 15 分钟的手动操作时间 ● miRNA Analysis 人类,小鼠 及大鼠的 miRNA 分析皆适用 完整包含 miRBase 资料库的 miRNA (人类、小鼠、大鼠) ● Copy Number Variation 同时检视人类基因组中 800 个区域 准确的标记感兴趣的区域 ● 帮助二代测序进行后期验证 NGS Validation
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Acknowledge ( PPT 特别鸣谢!) UCLA David Geffen School of Medicine www.medsch.ucla.edu/ANGEL/ Prof. ( ), et al.Prof. Gasson JC (UCLA Jonsson Comprehensive Cancer Center ), et al.
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