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Molecular Diagnosis II: Practical 张咸宁 [email protected] Tel:13105819271; 88208367 Office: A705, Research Building 2012/09 AREAS OF APPLICATION OF MOLECULAR DIAGNOSTICS Infectious Disease Neoplastic Disease Genetic Disease Identity Testing HLA Typing Pharmacogenetics APPLICATIONS OF MOLECULAR GENETIC TESTING Clinical diagnosis/confirmation Carrier screening Prenatal diagnosis Presymptomatic/predisposition diagnosis Resources • Gene Tests: www.genetests.org • American College of Medical Genetics: www.acmg.net • National Society of Genetic Counselors: www.nsgc.org • OMIM: http://www.ncbi.nlm.nih.gov/omim • The journals: Molecular Diagnosis, Diagnostic Molecular Pathology, Journal of Molecular Diagnosis, Genetic Testing and Molecular Biomarkers, Prenatal Diagnosis, … www.genetests.org Information resource for healthcare providers to help integrate genetic services into patient care Located at University of Washington Seattle, WA Funded by National Institutes of Health • GeneReviews: “User manual” for genetic testing for specific diseases 405 GeneReviews One new Review added each week • Laboratory Directory: “Yellow Pages” of genetics labs ~610 Clinical and research laboratories ~1460 Inherited diseases ~1180 clinical tests ~280 research only • Clinic Directory: “Yellow Pages” of genetic services 1160 clinics • Illustrated Glossary: Genetic counseling and testing terms Molecular genetic testing: United States • Testing used in patient care must be done in “clinical” laboratories, not research laboratories • Clinical laboratories have to meet standards set by federal law (“CLIA”) • Non-US laboratories are used when testing is not available in the US GeneReviews Content Summary Diagnosis Clinical Description Differential Diagnosis Management Genetic Counseling Molecular Genetics Resources References GeneReviews Summary One paragraph on: Disease characteristics Diagnosis/testing Management Genetic counseling Robert Guthrie The Father of Newborn Genetic Screening Robert Guthrie (1916-1995) • Microbiologist, SUNY Buffalo • Son with MR/DD and niece with PKU • Devised “Guthrie test” originally to monitor PKU therapy • Conceptualized NBS for PKU and the “Guthrie spot” Guthrie Test • is a bacterial inhibition assay. β2Thienylalanine is placed in the medium and normally causes the inhibition of Bacillus subtilis growth. However, in the presence of excess of phenylalanine, this inhibition is overridden and bacterial growth occurs. This test is the least expensive screening method available for determining excess phenylalanine in the blood, but other tests are used to confirm findings. Disease Targets of Newborn Screening »Phenylketonuria »Galactosemia »Congenital hypothyroidism »Sickle cell/hemoglobinopathies »Cystic fibrosis »Metabolic screen (TMS) »others? National NBS Status: 2006 ACMG NBS Expert Group, 2006 • Recommended screening for – Core panel of 29 diseases – Secondary targets of 25 diseases – Total of 54 diseases should be included in NBS test panels Watson et al. Genet. Med. 2006; 8:1S-11S Prenatal Diagnosis • The use of tests during a pregnancy to determine whether an unborn child is affected with a particular disorder. • Began in 1966. The Principal Indications for Prenatal Diagnosis by Invasive Testing 1. Advanced maternal age. 2. Previous child with a de novo chromosome abnormality. 3. Presence of structural chromosome abnormality in one of the parents. 4. Family history of a genetic disorder that may be diagnosed or ruled out by biochemical or DNA analysis. 5. Family history of an X-linked disorder for which there is no specific prenatal diagnostic test. 6. Risk of a neural tube defect (NTD). 7. Maternal serum screening and ultrasound. Methods of Noninvasive Testing in Prenatal Diagnosis ● Maternal serum alpha-fetoprotein ● Maternal serum screen (MSS) ● Ultrasonography ● Isolation of fetal cells from maternal circulation Screening and Diagnostic Tests for Down Syndrome The triple screen is a noninvasive screening test to determine whether there is an increased risk for Down syndrome. It is only a screening test and not a diagnostic test. Increased risk is associated with the following: • Low maternal serum α-fetoprotein (MSAFP) • Low unconjugated estriol (uE3) • Elevated human chorionic gonadotropin (hCG) Diagnostic tests include amniocentesis, chorionic villus sampling (CVS), and percutaneous umbilical blood sampling (PUBS). Ultrasound result for a fetus with a meningomyelocele, visible as fluid-filled sacs (arrow) located toward the base of the spinal column. Methods of Invasive Testing in Prenatal Diagnosis ● Amniocentesis: 15th to 16th weeks ● Chorionic villus sampling (CVS): 10th to 12th weeks ● Cordocentesis (PUBS): 19th to 21th weeks ● Preimplantation genetic diagnosis (PGD): before the fertilization Amniocentesis & CVS Amniocentesis: 15th to 16th weeks PGD (preimplantation genetic diagnosis) ICSI (intracytoplasmic sperm injection) Noninvasive Testing! • • • • Maternal serum screen: ? Smear swab: ? Saliva: ? Hair: ? 1979:DNA diagnosis(Yuet Wai Kan) Methods in MD: cytogenetic, biochemical, DNA-based tests • • • • • • • • • • • • • • Chromosome banding FISH CGH PCR RFLP SSCP RT-PCR Quantitative PCR Real-time PCR CFLP HA DHPLC CGGE TGGE • ASO • Protein truncating test (PTT) • Chemical mismatch cleavage (CMC) • RNase A cleavage • dideoxy fingerprinting (ddF) • SAGE • Mass spectrometry (MS) • LOH • DNA sequencing • DNA microarray • SELDI • MALDI • aCGH FISH of interphase nuclei with a chromosome 21 centromeric probe (CAMBIO) showing three signals consistent with trisomy 21. WAVE Transgenomic (USA) Detector Column Oven Autosampler Temperature Rack Interface Pump Degasser DHPLC ASO (allele-specific oligonucleotide) hybridization to detect an known mutation ASO (allele-specific oligonucleotide) hybridization to detect an known mutation Array Comparative Genomic Hybridization (aCGH) 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 Rosenblatt KP, et al. Annu Rev Med, 2004, 55:97–112 Rosenblatt KP, et al. Annu Rev Med, 2004, 55:97–112 Petricoin EF, et al. Trends Mol Med, 2004, 10:59–64 Acknowledge(PPT特别鸣谢!) • UCLA David Geffen School of Medicine • www.medsch.ucla.edu/ANGEL/ • Prof. Grody WW (Divisions of Medical Genetics and Molecular Pathology), et al.