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Pharmacogenomics Pharmacogenomics = Pharmacogenetics + IPO SNPs (single nucleotide polymorphisms) occur once every 100300 nucleotides SNPS can have profound effects on drug responses Single nucleotide polymorphisms in the ß2adrenergic receptor At least 13 SNPs identified in the human ß2-adrenergic receptor gene Amino acid # 16: Arg homozygotes: 15% Gly homozygotes: 45% ß2-AdR with Gly16 shows greatly increased agonist-induced down-regulation Amino acid #164: Thr homozygotes: 97% Thr/Ile heterozygotes: 3% ß2-AdR with Ile164 shows greatly reduced functional activity Gly16 SNP causes decreased sensitivity to albuterol % Increase in FEV1 16 12 Arg16 homozygotes 8 4 Gly16 homozygotes 0 0 4 8 Time (Hours) 12 Gly16 SNP causes increased desensitization to ß2 agonist Asthma patients given placebo or ß2 agonist bid for 4 weeks (and then crossed-over) Compare ß2-mediated bronchodilation after placebo treatment and after long-term agonist treatment: -Arg 16 homozygotes: no decrease in agonist-induced bronchodilation after 4 weeks agonist treatment -Gly16 homozygotes: big (46%) decrease in agonistinduced bronchodilation after 4 weeks agonist treatment Single nucleotide polymorphisms in the ß2adrenergic receptor At least 13 SNPs identified in the human ß2-adrenergic receptor gene Amino acid # 16: Arg homozygotes: 15% Gly homozygotes: 45% ß2-AdR with Gly16 shows greatly increased agonist-induced down-regulation Amino acid #164: Thr homozygotes: 97% Thr/Ile heterozygotes: 3% ß2-AdR with Ile164 shows greatly reduced functional activity One crummy amino acid in the ß2 adrenergic receptor makes a big difference in CHF patients Proportion Surviving 1.0 Thr 164 0.8 (n= 247) 0.6 Ile164 0.4 (n= 10) 0.2 (p < 0.001) 0.0 0 100 200 300 400 Days in study Polymorphism in 2C-AdR affects function Deletion of AA#322- 325Del322-325 has decreased coupling to Gi and decreased inhibition of NE release Deletion associated associated with five-fold increase in incidence of heart failure QuickTime™ and a TIFF (LZW) decompressor are needed to see this picture. Polymorphism in ß1-AdR affects function Arg389: 55-75%; Gly389: 25-45% Arg389 has increased coupling to Gs and functional responsiveness Arg389 exhibited 2.3-fold greater decrease in IOP in response to ß-blocker treatment after 6 weeks QuickTime™ and a TIFF (LZW) decompressor are needed to see this picture. Polymorphisms can interact synergistically ß1 (Arg389)-AdR: no increase in incidence of heart failure 2c(Del322-325):five-fold higher incidence of heart failure Both polymorphisms: 10- fold higher incidence of heart failure QuickTime™ and a TIFF (LZW) decompressor are needed to see this picture. QuickTime™ and a TIFF (LZW) decompressor are needed to see this picture. QuickTime™ and a TIFF (LZW) decompressor are needed to see this picture. QuickTime™ and a TIFF (LZW) decompressor are needed to see this picture. Orthostatic Intolerance/Postural Tachycardia Syndrome -Volatile heart rate and blood pressure -Tachycardia, especially when standing -Increased levels of plasma NE, especially when standing -Due to an inactivating point mutation in NE transporter QuickTime™ and a TIFF (LZW) decompressor are needed to see this picture. QuickTime™ and a TIFF (LZW) decompressor are needed to see this picture. WT HET WT HET QuickTime™ and a TIFF (LZW) decompressor are needed to see this picture. WT HET QuickTime™ and a TIFF (LZW) decompressor are needed to see this picture. WT HET NowSome Oldies But Goodies Slow IV administration in humans (10 µg/min) EPI (10 µg/min) ISO (10 µg/min) DA (0.5 µg/min) 100 50 180 120 60 Peripheral Resistance BP (mm. Hg) Pulse rate NE 15 min 15 min 15 min 15 min Beta- Adrenergic Receptors Mediate Positive Chronotropic Effect 80 Isoproterenol Norepinephrine 60 40 20 0 0.001 0. 01 0.1 1 10 100 Dose, µg/kg Effect of Ganglionic Stimulants BP HR + DMPP + Hexamethonium: + McN-A-343 BP HR + DMPP + McN-A-343