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Diagnosis of families with familial hypercholesterolaemia and/or Apo B-100 defect by means of DNA analysis of LDL-receptor gene mutations

  • Original Article
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Journal of Inherited Metabolic Disease

Summary

Background: One major problem of using hypercholesterolaemia alone as a primary criterion for diagnosing familial hypercholesterolaemia (FH) is that 15–40% of relatives may be misdiagnosed because plasma lipid levels in FH heterozygotes overlap with those in the general population. Setting: General Hospital/University of Vienna, Department of Pediatrics, Outpatient lipid clinic. Methods: As a part of the MED-PED (make early diagnosis – prevent early death) project we are currently investigating children, adolescents and their relatives who are suspected to be affected with FH in our out-patient clinic for metabolic diseases using MED-PED inclusion criteria and confirming the diagnosis by means of DNA analysis. Patients: 263 patients with premature atherosclerosis and/or hypercholesterolaemia: 116 children (mean age 11.6 ± 4.1 years; 57 girls and 59 boys) and 147 adults (64 women, mean age 41.5 ± 13.7 years; 83 men, mean age 42.8 ± 10.8 years). Results: 119 patients with mutations have been detected; 56 children with either low density lipoprotein receptor (LDLR) and/or ApoB mutations (27 girls and 29 boys; mean total cholesterol (TC) 275 ± 71 mg/dl, triglycerides (TG) 101 ± 57 mg/dl, high-density lipoprotein cholesterol (HDL-C) 49 ± 12 mg/dl, low-density lipoprotein cholesterol (LDL-C) 198 ± 67 mg/dl) and one boy with a homozygous. LDLR mutation. A further 62 adults with LDLR and/or ApoB mutations were documented; 33 women (mean age 36.9 ± 11.1 years; mean TC 283 ± 76 mg/dl, TG 137 ± 78 mg/dl, HDL-C 55 ± 17 mg/dl, LDL-C 210 ± 67 mg/dl) and 29 men (mean age 45.0 ± 10.6 years; mean TC 301 ± 87 mg/dl, TG 163 ± 112 mg/dl, HDL-C 42 ± 12 mg/dl, LDL-C 233 ± 83 mg/dl). In 32 of these subjects (11 children (21%), 21 adults (42%)), serum lipid levels were lower than the diagnostic MED-PED limits adopted, so that they might have been misclassified without an additional DNA analysis. Conclusion: In our study, diagnosis of FH and related disorders (ApoB-100 defect) by means of conventional laboratory methods missed at least 21% in children and 42% in adults affected with LDLR and/or ApoB gene mutations. Genetic FH diagnosis provides a tool for specific diagnosis of mutation carrier status.

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Abbreviations

CVD:

coronary heart disease

FH:

familial hypercholesterolaemia

HDL-C:

high-density lipoprotein cholesterol

LDL-C:

low-density lipoprotein cholesterol

LDLR:

low density lipoprotein receptor

MCI:

myocardial infarction

MED-PED:

make early diagnosis – prevent early death

TC:

total cholesterol

TG:

triglycerides

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Authors and Affiliations

  1. Department of Pediatrics, University of Vienna, Vienna, Austria

    K. Widhalm, A. Dirisamer & A. Lindemayr

  2. Department of Radiology, University of Vienna, Vienna, Austria

    A. Dirisamer

  3. Department of Medical Biochemistry, University of Graz, Graz, Austria

    G. Kostner

Authors
  1. K. Widhalm
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  2. A. Dirisamer
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  3. A. Lindemayr
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  4. G. Kostner
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Correspondence to K. Widhalm.

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Communicating editor: Georg Hoffmann

Competing interests: None declared

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Widhalm, K., Dirisamer, A., Lindemayr, A. et al. Diagnosis of families with familial hypercholesterolaemia and/or Apo B-100 defect by means of DNA analysis of LDL-receptor gene mutations. J Inherit Metab Dis 30, 239–247 (2007). https://doi.org/10.1007/s10545-007-0563-5

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