Influence of the HMGCoA reductase (HMGCR) and LDL receptor (LDLR) gene polymorphisms on response to atorvastatin (10 mg/day/4weeks) was evaluated in hypercholesterolemic (HC) individuais. Blood samples were collected from 153 HC and 182 normolipidemic (NL) individuais for serum lipids determinations and DNA extratcion. Single nucleotide polymorphisms (SNP) HMGCR (A11898T e T24558G) and LDLR (C16730T, C20001T, G26857A) were detected by PCR-RFLP. HMGCR 11898T and 24558G alleles were associated with lower serum triglycerides and VLDL-C in NL and HC groups (p<0.05). Moreover, the SNP HMGCR T24558G was related to increased serum HDL-C and apoAI in response to atorvastatin in the HC group. The LDLR 20001 C allele was associated with higher basal serum apoAI in the NL group (p=0.034) and with better response of apoAI to atorvastatin in HC group (p=0.045). There was a relationship between heterozygote LDLR 20001 C/16730T haplotype and a significant reduction of apoB and increase in apoAI serum leveis after atorvastatin treatment (p<0.05). In conclusion, the HMGCR A11898T e T24558G SNPs influence serum triglycerides and VLDL-C independently of the lipemic status and LDLR 20001 C/16730T haplotype is associated with better serum apoB and Apol response to atorvastatin treatment.
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