Additive effect of mutations in LDLR and PCSK9 genes on the phenotyoe of familial hypercholesterolemia

Angelo Baldassare Cefalu', Maurizio Averna, Raffaele Fresa, Alfredo Cantafora, Dilip Patel, Sebastiano Calandra, Livia Pisciotta, Antonella Bellocchio, Patrizia Tarugi, Stefano Bertolini, Claudio Priore Oliva

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Abstract

Patients homozygous or Compound heterozygous for LDLR mutations or double heterozygous for LDLR and apo B R3500Q mutation have higher LDL-C levels. more extensive xanthomatosis and more severe premature coronary disease (pCAD) than simple heterozygotes for mutations in either these genes or for missense mutations in PCSK9 gene. It is not known whether combined mutations in LDLR and PKCS9 are associated with such a severe phenotype. We sequenced Apo B and PCSK9 genes in two patients with the clinical diagnosis of homozygous FH who were heterozygous for LDLR gene mutations. Proband Z.P. (LDL-C 13.39 mmol/L and pCAD) was heterozygous for an LDLR mutation (p.E228K) inherited from her father (LDL-C 8.07 mmol/L) and a PCSK9 mutation (p.R496W) from her mother (LDL-C 5.58 mmol/L). Proband L.R. and her sister (LDL-C 11.51 and 10.47 mmol/L. xanthomatosis and carotid atherosclerosis) were heterozygous for all LDLR mutation (p.Y419X) inherited from their mother (LDL-C 6.54 mmol/L) and a PCSK9 mutation (p.N425S) probably from their deceased father. The LDL-C levels in double heterozygotes of these two families were 56 and 44% higher than those found in simple heterozygotes for the two LDLR mutations, respectively. The two PCSK9 Mutations are novel and were not found in I 10 controls and 80 patients with co-dominant hypercholesterolemia. These observations indicate that Fare missense Mutations of PCSK9 may worsen the clinical phenotype of patients carrying LDLR mutations.
Lingua originaleEnglish
pagine (da-a)433-440
Numero di pagine8
RivistaATHEROSCLEROSIS
Volume2
Stato di pubblicazionePublished - 2006

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All Science Journal Classification (ASJC) codes

  • Cardiology and Cardiovascular Medicine

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Cefalu', A. B., Averna, M., Fresa, R., Cantafora, A., Patel, D., Calandra, S., Pisciotta, L., Bellocchio, A., Tarugi, P., Bertolini, S., & Oliva, C. P. (2006). Additive effect of mutations in LDLR and PCSK9 genes on the phenotyoe of familial hypercholesterolemia. ATHEROSCLEROSIS, 2, 433-440.