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BMC Medical Genetics
Published in: BMC Medical Genetics 1/2015

Open Access 01-12-2015 | Research article

Next-generation-sequencing-based identification of familial hypercholesterolemia-related mutations in subjects with increased LDL–C levels in a latvian population

Authors: Ilze Radovica-Spalvina, Gustavs Latkovskis, Ivars Silamikelis, Davids Fridmanis, Ilze Elbere, Karlis Ventins, Guna Ozola, Andrejs Erglis, Janis Klovins

Published in: BMC Medical Genetics | Issue 1/2015

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Abstract

Background

Familial hypercholesterolemia (FH) is one of the commonest monogenic disorders, predominantly inherited as an autosomal dominant trait. When untreated, it results in early coronary heart disease. The vast majority of FH remains undiagnosed in Latvia. The identification and early treatment of affected individuals remain a challenge worldwide. Most cases of FH are caused by mutations in one of four genes, APOB, LDLR, PCSK9, or LDLRAP1. The spectrum of disease-causing variants is very diverse and the variation detection panels usually used in its diagnosis cover only a minority of the disease-causing gene variants. However, DNA-based tests may provide an FH diagnosis for FH patients with no physical symptoms and with no known family history of the disease. Here, we evaluate the use of targeted next-generation sequencing (NGS) to identify cases of FH in a cohort of patients with coronary artery disease (CAD) and individuals with abnormal low-density lipoprotein–cholesterol (LDL–C) levels.

Methods

We used targeted amplification of the coding regions of LDLR, APOB, PCSK9, and LDLRAP1, followed by NGS, in 42 CAD patients (LDL–C, 4.1–7.2 mmol/L) and 50 individuals from a population-based cohort (LDL–C, 5.1–9.7 mmol/L).

Results

In total, 22 synonymous and 31 nonsynonymous variants, eight variants in close proximity (10 bp) to intron–exon boundaries, and 50 other variants were found. We identified four pathogenic mutations (p.(Arg3527Gln) in APOB, and p.(Gly20Arg), p.(Arg350*), and c.1706–10G > A in LDLR) in seven patients (7.6 %). Three possible pathogenic variants were also found in four patients.

Conclusion

NGS-based methods can be used to detect FH in high-risk individuals when they do not meet the defined clinical criteria.
Appendix
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Metadata
Title
Next-generation-sequencing-based identification of familial hypercholesterolemia-related mutations in subjects with increased LDL–C levels in a latvian population
Authors
Ilze Radovica-Spalvina
Gustavs Latkovskis
Ivars Silamikelis
Davids Fridmanis
Ilze Elbere
Karlis Ventins
Guna Ozola
Andrejs Erglis
Janis Klovins
Publication date
01-12-2015
Publisher
BioMed Central
Published in
BMC Medical Genetics / Issue 1/2015
Electronic ISSN: 1471-2350
DOI
https://doi.org/10.1186/s12881-015-0230-x

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