Physiogenomic analysis of statin-treated patients: domain-specific counter effects within the ACACB gene on low-density lipoprotein cholesterol?
OBJECTIVE
Administered at maximal dosages, the most common statins--atorvastatin, simvastatin and rosuvastatin--lower low-density lipoprotein cholesterol (LDLC) by an average of 37-57% in patients with primary hypercholesterolemia. We hypothesized novel genetic underpinnings for variation in LDLC levels in the context of statin therapy.


METHODS
Genotyping of 384 SNPs in 202 volunteers from a lipid outpatient clinic was accomplished and LDLC levels obtained from chart records. The SNPs were distributed across 222 genes representing physiological pathways such as general metabolism, cholesterol biochemistry, cardiovascular function, inflammation, neurobiology and cell proliferation. We discovered significant associations with LDLC levels for the rs34274 SNP (p < 0.0002) and for rs2241220 (p < 0.008) in the acetyl-coenzyme A carboxylase beta (ACACB) gene. When corrected for multiple testing, the false-discovery rate associated with rs34274 was 0.076 (significance threshold: 0.10) and for rs2241220 the false-discovery rate was 0.93 (not significant). The acetyl coenzyme A carboxylase beta enzyme synthesizes malonyl coenzyme A, an essential substrate for hepatic fatty acid synthesis and an inhibitor of fatty acid oxidation.


RESULTS
The SNPs were in weak linkage disequilibrium (D = 0.302). Minor alleles at these sites demonstrate opposing influences on LDLC; the C>T substitution at rs34724 is a risk marker and the C>T substitution at rs2241220 a protective marker for LDLC levels. These SNPs hypothetically influence enzymatic activity through different mechanisms, rs34274 through the PII promoter and rs2241220 via alteration of the protein's responsiveness to allosteric influence.


CONCLUSIONS
Physiogenomic evidence suggests a novel link between LDLC levels and the regulation of fatty acid metabolism. The findings complement previously discovered novel SNP relationships to myalgia (pain) and myositis (serum creatine kinase activity). By genotyping for myositis, myalgia and LDLC levels, a physiogenomic model may be developed to help clinicians maximize effectiveness and minimize side effects in prescribing statins.
Ruaño
Gualberto
G
Genomas, Inc, 67 Jefferson Street, Hartford, CT 06106, USA. g.ruano@genomas.net
Thompson
Paul D
PD
Kane
John P
JP
Pullinger
Clive R
CR
Windemuth
Andreas
A
Seip
Richard L
RL
Kocherla
Mohan
M
Holford
Theodore R
TR
Wu
Alan H B
AH
D000103:Acetyl-CoA Carboxylase / Q000235:genetics; D000368:Aged; D000924:Anticholesteremic Agents / Q000627:therapeutic use*; D000069059:Atorvastatin; D002784:Cholesterol / Q000097:blood; D008078:Cholesterol, LDL / Q000097:blood*; D003430:Cross-Sectional Studies; D005260:Female; D005464:Fluorobenzenes / Q000627:therapeutic use; D005838:Genotype; D006538:Heptanoic Acids / Q000627:therapeutic use; D006801:Humans; D019161:Hydroxymethylglutaryl-CoA Reductase Inhibitors / Q000008:administration & dosage / Q000009:adverse effects / Q000627:therapeutic use*; D006937:Hypercholesterolemia / Q000139:chemically induced / Q000188:drug therapy; D008297:Male; D008875:Middle Aged; D020641:Polymorphism, Single Nucleotide; D011743:Pyrimidines / Q000627:therapeutic use; D011758:Pyrroles / Q000627:therapeutic use; D000068718:Rosuvastatin Calcium; D019821:Simvastatin / Q000627:therapeutic use; D013449:Sulfonamides / Q000627:therapeutic use
D000924:Anticholesteremic Agents; D008078:Cholesterol, LDL; D005464:Fluorobenzenes; D006538:Heptanoic Acids; D019161:Hydroxymethylglutaryl-CoA Reductase Inhibitors; D011743:Pyrimidines; D011758:Pyrroles; D013449:Sulfonamides; D000068718:Rosuvastatin Calcium; D002784:Cholesterol; D000069059:Atorvastatin; D019821:Simvastatin; D000103:Acetyl-CoA Carboxylase