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Gepubliceerd in: Netherlands Heart Journal 6/2013

Open Access 01-06-2013 | Original Article

Recurrent and founder mutations in the Netherlands—Phospholamban p.Arg14del mutation causes arrhythmogenic cardiomyopathy

Auteurs: P. A. van der Zwaag, I. A. W. van Rijsingen, R. de Ruiter, E. A. Nannenberg, J. A. Groeneweg, J. G. Post, R. N. W. Hauer, I. C. van Gelder, M. P. van den Berg, P. van der Harst, A. A. M. Wilde, J. P. van Tintelen

Gepubliceerd in: Netherlands Heart Journal | Uitgave 6/2013

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Abstract

Background

Recently, we showed that the c.40_42delAGA (p.Arg14del) mutation in the phospholamban (PLN) gene can be identified in 10–15 % of Dutch patients with dilated cardiomyopathy or arrhythmogenic cardiomyopathy. The arrhythmogenic burden of the p.Arg14del mutation was illustrated by the high rate of appropriate ICD discharges and a positive family history for sudden cardiac death.

Methods

Our goal was to evaluate the geographical distribution and the origin of this specific mutation in the Netherlands and to get an estimation of the prevalence in a Dutch population cohort. Therefore, we investigated the postal codes of the places of residence of PLN p.Arg14del mutation carriers and places of birth of their ancestors. In addition, a large population-based cohort (PREVEND) was screened for the presence of this mutation.

Results

By April 2012, we had identified 101 probands carrying the PLN p.Arg14del mutation. A total of 358 family members were also found to carry this mutation, resulting in a total of 459 mutation carriers. The majority of mutation carriers live in the northern part of the Netherlands and analysing their grandparents’ places of birth indicated that the mutation likely originated in the eastern part of the province of Friesland. In the PREVEND cohort we identified six heterozygous PLN p.Arg14del mutation carriers out of 8,267 subjects (0.07 %).

Conclusion

The p.Arg14del mutation in the PLN gene is the most frequently identified mutation in Dutch cardiomyopathy patients. The mutation that arose 575–825 years ago is likely to have originated from the eastern part of the province of Friesland and is highly prevalent in the general population in the northern part of the Netherlands.

Introduction

Inherited cardiomyopathies are genetically heterogeneous disorders of the heart which often develop during adolescence or early adult life [1]. Cardiomyopathies are grouped into different categories, based on their functional and morphological properties and subdivisions can be made according to the genetic basis [2, 3]. Genetic overlap between cardiomyopathies is well-recognised. Hypertrophic cardiomyopathy (HCM) is characterised by a thickened wall of the left ventricle [4], and mutations in any of nine genes encoding sarcomeric proteins can be found in 30–65 % of HCM patients worldwide [57]. However, mutations in these genes can also be identified in 18 % of patients with dilated cardiomyopathy (DCM) [8], which is characterised by left ventricular dilatation and contractile dysfunction. Arrhythmogenic right ventricular cardiomyopathy (ARVC) is another cardiomyopathy subtype, characterised by fibrofatty replacement of cardiomyocytes, primarily in the right ventricle [9]. In addition to this classic right ventricular subtype, biventricular involvement and left ventricular predominance have been described [10]. ARVC is considered to be mainly a ‘disease of the desmosome’, a cell-cell adhesion complex [11]. Screening of desmosomal genes has identified mutations in 40-58 % of patients diagnosed with ARVC, but also in 5 % of patients in a DCM cohort from the United Kingdom [1215]. The observed clinical and genetic overlap between ARVC and DCM has led to the postulation of arrhythmogenic cardiomyopathy as the encompassing entity [16].
Of the cardiomyopathies, DCM is genetically the most heterogeneous; in addition to the sarcomere genes, more than 30 genes have been identified in DCM families [17]. One of the genes implicated in DCM encodes phospholamban (PLN), a calcium handling protein in the sarcoplasmic reticulum of cardiac muscle [18]. A number of mutations have been identified, leading to a highly variable phenotype, ranging from cardiac death in early adulthood to middle-aged asymptomatic mutation carriers [19, 20].
The yield from screening cardiomyopathy populations for PLN mutations is generally very low, ranging from 0.08 % to 0.38 % in selected cohorts [2125]. Surprisingly, we identified the PLN p.Arg14del mutation not only in 13 % (31/240) of Dutch patients diagnosed with DCM, but also in 12 % (12/97) of Dutch patients diagnosed with ARVC [26]. The arrhythmogenic burden of the p.Arg14del mutation was illustrated by the high rate of appropriate ICD discharges and a positive family history for sudden cardiac death. Furthermore, p.Arg14del mutation carriers more frequently underwent cardiac transplantation, compared with patients with familial DCM [26]. Cascade screening has identified dozens of family members carrying the same mutation. Both variable expression and age-dependent penetrance, which are hallmarks of all inherited cardiomyopathies, are characteristic of the p.Arg14del mutation.
Recurrent and founder mutations in the Netherlands causing cardiac disease have been described in this series of the Netherlands Heart Journal [7, 2730]. Here, we report our analysis of the origin of the p.Arg14del mutation, both by geographic region using postal code maps, and by age using haplotype analysis. Furthermore, we screened a large population-based cohort for the presence of the p.Arg14del mutation to get an impression of the potential number of mutation carriers in the Netherlands.

Materials & methods

Genetic evaluation

Sequencing analysis and haplotype analysis for the PLN p.Arg14del mutation has been described elsewhere [26]. To estimate the age of the haplotype, the linkage disequilibrium between the mutation and recombinant microsatellite markers was calculated and the recombination fraction from the distances between the mutation and microsatellite markers was determined, enabling estimation of the number of generations since a mutation had occurred [31].

Postal code analysis

The postal codes of the places of residence of all PLN p.Arg14del mutation carriers were plotted to study their geographical distribution. To study the region where the mutation likely originated, we used a scoring system based on the birthplaces of the grandparents of the proband carrying the PLN p.Arg14del mutation. Without any additional genetic results, each grandparent had a chance of 1 in 4 of being a carrier of the mutation and therefore a score of ¼ was applied to the postal code of each grandparent’s place of birth. If it was known whether the mutation was inherited either paternally or maternally, that pair of grandparents had a chance of 1 in 2 of being a carrier of the mutation and a score of ½ was applied to the postal codes of their places of birth. If it was proven which grandparent was the carrier of the mutation, a score of 1 was applied to the postal code for their place of birth. The sum of all the scores per postal code area was plotted. These analyses were based on the PC2 code (the first two numbers of the postal code) of the mutation carriers and their grandparents. Data were visualised with MapInfo Professional (MapInfo, Toronto, Canada).

Cohort study

A large population-based cohort from the city of Groningen, in the north of the Netherlands, the Prevention of Renal and Vascular ENd-stage Disease (PREVEND) cohort (N = 8,267), was screened for the presence of the PLN p.Arg14del mutation. The PREVEND study was designed to prospectively investigate the association between urinary albumin excretion and renal and cardiovascular outcome in the general population. The study protocol is described elsewhere [32, 33]. In the period 1997–1998, 8592 participants were enrolled in the study and DNA samples were available for 8267 participants. The PREVEND study was approved by the local medical ethics committee and conducted in accordance with the Declaration of Helsinki.

Mutation detection

The prevalence of the PLN p.Arg14del mutation in the PREVEND cohort was evaluated using KASPar® PCR SNP genotyping system (KBiosciences, Herts, UK). All the 8267 available DNA samples were screened for the mutation.

Results

Genetic evaluation

By April 2012, we had identified 101 unique probands carrying the PLN p.Arg14del mutation. A total of 358 family members were found to carry the same mutation, resulting in a total of 459 mutation carriers and an average of 4.5 (range 1–17) mutation carriers per family.
Haplotype analysis was performed in 49 of the 101 Dutch PLN p.Arg14del families and in three families from the United States, Germany and Greece [26]. A shared haplotype for five markers in a 1.2 Mb region surrounding PLN was found, although patients from the Greek family with the p.Arg14del mutation carried another haplotype (Table 1). Allowing 25 years per generation, the age of the ‘Dutch’ haplotype containing the mutation is estimated to be between 575 and 825 years old [26].
Table 1
Shared haplotype surrounding the PLN gene for the p.Arg14del mutation carriers from the Netherlands, Germany and the US
https://static-content.springer.com/image/art%3A10.1007%2Fs12471-013-0401-3/MediaObjects/12471_2013_401_Tab1_HTML.gif
The shared haplotype in a selection of PLN p.Arg14del probands is marked in grey.
For patient D12, the size of the first proximal marker (PLN−50 K) had most likely changed. For patients D12 and the one from the United States (US), either the size of the first distal marker (PLN+200 K) had changed or a recombination had occurred. The identical haplotype, found in two patients from the German pedigree published by Posch et al. [34], is also shown. Two PLN p.Arg14del mutation carriers from the Greek pedigree published by Haghighi et al. [21] carried another haplotype, as shown in the box. The position on chromosome 6 is listed. DCM indicates dilated cardiomyopathy; ARVC arrhythmogenic right ventricular cardiomyopathy.

Postal code analysis

The geographic distribution of the place of residence of the mutation carriers is plotted in Fig. 1, which shows that the majority of the identified carriers live in the northern part of the Netherlands and in the province of Noord-Holland, and that the numbers decrease gradually towards the south.
To determine the origin of the Dutch founder haplotype containing the PLN p.Arg14del mutation, we analysed the place of birth of the proband’s grandparents and scored the corresponding postal codes according to their chance of being the grandparent carrying the mutation. Data on these places of birth were available for 60 of the 101 probands and the results are shown in Fig. 2. We found that the majority of ancestors came from the eastern part of the province Friesland.
The phenotypes of PLN p.Arg14del mutation carriers vary greatly, not only between families, but also within the same family, as illustrated by the family shown in Fig. 3a and Table 2. The proband III:1 was diagnosed with ARVC at age 21. She sought medical attention after experiencing palpitations. She presented with a low-voltage ECG with ventricular bigeminy and monomorphic ventricular extrasystoles from the right ventricular outflow tract (Fig. 3b). During the course of 9 years follow-up, she developed progressive heart failure and experienced several appropriate ICD discharges because of ventricular tachyarrhythmias. She was placed on the waiting list for a cardiac transplantation, but died at age 30. Her mother, who also carried the PLN p.Arg14del mutation, had recordings of non-sustained VTs on 24 h Holter ECG monitoring, but her evaluation was otherwise unremarkable. The grandfather, also a mutation carrier, died at age 75 without ever seeking medical attention because of possible cardiac problems. The proband’s two sisters (age 30 and 27 when last evaluated) were found to be carriers of the PLN p.Arg14del mutation and are being monitored frequently, but have not experienced any symptoms, although the oldest sister demonstrated 1100 premature ventricular complexes on 24 h Holter monitoring (Table 2).
Table 2
Clinical characteristics of the family members shown in Figure 3
ID
Sex
Age at 1st evaluation
Results at 1st evaluation
Follow-up
Notes
I:1
M
NA
NA
NA
†75 years
I:2
F
77 years
24 h ECG showed PVCs; echocardiography normal
NA
 
II:1
F
43 years
24 h-ECG showed non-sustained VT; echocardiography normal
11 years
No progression
II:2
F
NA
NA
NA
 
III:1
F
21 years
Low voltage ECG; abnormal SA-ECG; 15,000 PVCs on 24 h ECG; sustained VT on EPS; fibrofatty replacement on cardiac biopsy; diagnosed with ARVC; ICD implanted
9 years
†30 years; died of heart failure while on waiting list for HTx
III:2
F
20 years
Family screening; no abnormalities
10 years
1,100 PVCs on 24 h ECG
III:3
F
17 years
Family screening; no abnormalities
10 years
Delivered a healthy boy at 28 years
IV:1
M
NA
NA
NA
 
EPS indicates electrophysiology study; HTx cardiac transplantation; ICD implantable cardioverter defibrillator; PVC premature ventricular complex; SA-ECG signal averaged ECG; VT ventricular tachycardia. NA not available

Cohort study

In the PREVEND cohort we identified six heterozygous PLN p.Arg14del mutation carriers out of 8267 subjects (0.07 %). These PLN p.Arg14del mutation carriers (age at baseline 48 ± 16 years; 4 males) did not have a clinically manifested cardiomyopathy at baseline. Three mutation carriers were diagnosed with hypertension at baseline, and three were diagnosed with diabetes mellitus. One subject (male, age at baseline 69 years) developed heart failure during the 10-year follow-up period; the others had not experienced heart failure at a mean age of 53.4 years. None of the six mutation carriers were diagnosed with atrial fibrillation or left ventricular hypertrophy on the ECG. The set-up of the database provided no additional cardiological data.

Discussion

The p.Arg14del mutation in the PLN gene is the most frequently identified mutation in cardiomyopathy patients in the Netherlands and the single most identified mutation in cardiomyopathy patients worldwide. Dutch mutation carriers showed high rates of appropriate ICD discharges, cardiac transplantation and a positive family history for sudden cardiac death [26]. This mutation has also been identified in cohorts in other countries, such as Germany, Spain, Greece, Canada, and the United States [21, 22, 34, 35 and personal communications M. Gollob & R. Hamilton]. The German family and an ARVC patient from the United States carried the same haplotype surrounding the PLN gene as the patients from the Netherlands. The Greek patients carried another haplotype, illustrating that the PLN p.Arg14del mutation is recurrent, with at least two different haplotypes identified. All the Dutch patients carried the same haplotype and we estimated this haplotype to be between 575 and 825 years old. Although we have identified the founder effect of the PLN p.Arg14del mutation in the Netherlands, we cannot exclude that its origin is foreign, due to immigration from Germany, Belgium, France or Spain, for example, especially considering the age of the mutation [36]. The emigration in the 19th and early 20th century of PLN p.Arg14del mutation carriers from the Netherlands or from other Northern European countries to the United States and Canada has likely resulted in the presence of this mutation in North America. Dutch mutation carriers could also have emigrated to South Africa, Australia and New Zealand. The presence of the p.Arg14del mutation needs to be confirmed in genetic studies in these countries.
To estimate the geographical origin of the p.Arg14del mutation, we used a scoring method based on the places of birth of the probands’ grandparents. This scoring system revealed the eastern part of the province Friesland as the most likely area of origin of the p.Arg14del mutation in the Netherlands (Fig. 2). Most current mutation carriers live in the northern part of the Netherlands including the province of Noord-Holland, i.e. close to the origin of the mutation, and a gradual decline towards the southern part of the Netherlands can be seen in Fig. 1. As has been shown for other founder mutations in the Netherlands, including some described in this NHJ series [7, 2730], the migration of much of the Dutch population, and therefore mutation carriers, has been fairly limited and the distribution of current mutation carriers already gives a clear indication of its origin.
Following the identification of the p.Arg14del mutation in cardiomyopathy patients, we sought to identify whether the mutation was also present in a large population-based cohort from the northern Netherlands that had not been selected for the presence of cardiomyopathy or other cardiac diseases. Six of 8267 subjects (0.07 %) were identified as mutation carriers, suggesting that the mutation could be present in approximately 1:1400 individuals in the northern part of the Netherlands. Postal code analysis suggested a lower frequency towards the south. By April 2012, the population of the three northern provinces of Groningen, Friesland and Drenthe was 1.7 million [37]. Given these numbers, approximately 1250 PLN p.Arg14del mutation carriers are suspected to live in these provinces. The prevalence of the mutation in other provinces is expected to be lower, but since they have larger populations (e.g. 2.7 million in the province of North Holland), the total number of Dutch PLN p.Arg14del carriers is likely to be more than 2000. Cascade family screening is ongoing and will probably identify several hundred more carriers.
The age at inclusion (48 ± 16 years) of these carriers illustrates the age-dependent penetrance and variable expression of the p.Arg14del mutation. Since the onset of mutation-related symptoms (mean age 44.4 years) is well after the start of their reproductive age [26], many mutation carriers had already had children, explaining the continued high prevalence of the mutation. This mean age is likely to be biased, since the index patients usually mark the severe end of the disease spectrum. Some index patients had had a child who had died of sudden cardiac death at a much younger age than their age of onset.
Following the arrhythmogenic profile of the PLN p.Arg14del mutation, primary prevention by implanting an ICD could be beneficial for mutation carriers. We aim to determine the risk factors which will identify individuals at high risk for life-threatening ventricular arrhythmias. Identification of independent risk factors would enable the selection of PLN p.Arg14del mutation carriers who are most likely to benefit from an ICD, while the absence of such risk factors in other carriers would justify alternative treatment options. We have set up the PHOspholamban RElated CArdiomyopathy STudy (PHORECAST, www.​phorecast.​nl) to evaluate the possible risk factors for life-threatening ventricular arrhythmias. This study will be of great importance for all p.Arg14del mutation carriers as well as their cardiologists, who are faced with a great variability of symptoms and large clinical differences, both between and within affected families.

Acknowledgments

We thank all the patients and their relatives who made this work possible, Hennie Bikker, Dennis Dooijes, Marielle E. van Gijn, Arjan Houweling, Jan D.H. Jongbloed, Marjon A. Slegtenhorst, and Arthur van den Wijngaard for providing results of DNA sequence analyses, and Jackie Senior for editing the manuscript.

Funding

This study was supported by a grant from the Netherlands Heart Foundation (2007B132).

Conflict of interests

None declared.
Open Access This article is distributed under the terms of the Creative Commons Attribution License which permits any use, distribution, and reproduction in any medium, provided the original author(s) and the source are credited.
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Metagegevens
Titel
Recurrent and founder mutations in the Netherlands—Phospholamban p.Arg14del mutation causes arrhythmogenic cardiomyopathy
Auteurs
P. A. van der Zwaag
I. A. W. van Rijsingen
R. de Ruiter
E. A. Nannenberg
J. A. Groeneweg
J. G. Post
R. N. W. Hauer
I. C. van Gelder
M. P. van den Berg
P. van der Harst
A. A. M. Wilde
J. P. van Tintelen
Publicatiedatum
01-06-2013
Uitgeverij
Bohn Stafleu van Loghum
Gepubliceerd in
Netherlands Heart Journal / Uitgave 6/2013
Print ISSN: 1568-5888
Elektronisch ISSN: 1876-6250
DOI
https://doi.org/10.1007/s12471-013-0401-3

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