Instructor: Dr. Shahzad A. Mufti Advisor Department of Biosciences Teratogenesis: Genetic and Environmental causes.

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Instructor: Dr. Shahzad A. Mufti Advisor Department of Biosciences Teratogenesis: Genetic and Environmental causes

Genetic, Environmental, Thalidomide episode, DDT & bird egg cases. In 1964 Rubella cases. Many teratogens in environment. Embryonic period (8-9 weeks) more susceptible, especially, 3 to 8 weeks. Teratogenic Agents: Drugs & chemicals. Viruses, radiations, hyperthermia, maternal metabolic defects. Teratogenesis October 23, 20152

Quinine, Alcohol, Heavy Nicotine and caffeine doses, smoking also reduces the number, quality and motility of sperms. Pesticides. Many drugs e.g. valproic acid (anti- convulsant). Even “useful” substances such as retinoic acid------if in excess (13-cis-retinoic acid used for acne), especially thru its binding to neural crest cells) Teratogenesis October 23, 20153

Alcohol another important teratogen. Fetal Alcohol Syndrome (FAS): small head, mental retardation, low IQ (  68). Brain defects, fusion defects of upper lips. Endocrine Disruptors: interfere with hormones, by binding with receptors or blocking synthesis of normal hormones. Teratogenesis October 23, 20154

Examples: diethylstilbestrol, given (in 50’s and 60’s) to prevent miscarriage  abnormal reproductive system in fetus. HEAVY METALS: e.g. Zinc, Lead, Mercury etc used in industry, pollute soil, water, air….CNS defects. Teratogenesis October 23, 20155

Pesticides: chlorinated hydrocarbons (DDT), Organophosphates, pyrethroids, Carbamates etc. Other: over 50,000 artificial chemicals now used. Very little information available. Teratogenesis October 23, 20156

FertilizationOctober 23, DRUGS AND CHEMICALSIONIZING RADIATION (X-RAYS) AlcoholHYPERTHERMIA Aminoglycosides (Gentamycin)INFECTION MICROORGANISMS AminopterinCoxsackie virus Antithyroid agents (PTU)Cytomegalovirus BromineHerps simplex Cigarette smokeParvovirus CocaineRubella (German measles) CortisoneToxoplasma gondii (toxoplasmosis) Diethylstilbesterol (DES)Treponema Pallidum (syphilis) DiphenylhydantoinMETABOLIC CONDITIONS IN THE MOTHER HeroinAutoimmune disease (including Rh incompatibility) LeadDiabetes MethylmercuryDietary deficiencies, malnutrition PenicillaminePhenylketonuria Retinoic acid (Isotretinoin, Accutane) Streptomycin Tetracycline Thalidomide Trimethadione Valproic acid Warfarin Source: Adapted from Opitz a This list includes known and possible teratogenic agents and is not exhaustive. Some agents thought to cause disruptions in human fetal development