Endomyocardial biopsies in patients with left ventricular hypertrophy and a common Chinese later-onset fabry mutation (IVS4 + 919G > A)
- Ting-Rong Hsu1, 2,
- Shih-Hsien Sung3,
- Fu-Pang Chang4,
- Chia-Feng Yang2,
- Hao-Chuan Liu2,
- Hsiang-Yu Lin5,
- Chun-Kai Huang2, 6,
- He-Jin Gao2, 6,
- Yu-Hsiu Huang2, 6,
- Hsuan-Chieh Liao7,
- Pi-Chang Lee2,
- An-Hang Yang4,
- Chuan-Chi Chiang7,
- Ching-Yuang Lin8,
- Wen-Chung Yu3Email author and
- Dau-Ming Niu1, 2, 6Email author
© Hsu et al.; licensee BioMed Central Ltd. 2014
Received: 24 February 2014
Accepted: 19 June 2014
Published: 1 July 2014
In Taiwan, DNA-based newborn screening showed a surprisingly high incidence of a cardiac Fabry mutation (IVS4 + 919G > A). The prevalence of this mutation is too high to be believed that it is a real pathogenic mutation. The purpose of this study is to identify the cardiac pathologic characteristics in patients with left ventricular hypertrophy and this mutation
Methods and results
Endomyocardial biopsies were obtained in 22 patients (Median age: 61, males: 17; females: 5) with left ventricular hypertrophy and the IVS4 + 919G > A mutation; five patients had not received enzyme replacement therapy (ERT) before biopsy, while the other 17 patients had received ERT from 8 months to 51 months. Except for three patients who had received ERT for more than 3 years, all other patients showed significant pathological change and globotriaosylceramide (Gb3) accumulation in their cardiomyocytes. In contrast to classical Fabry patients, no Gb3 accumulation was found in the capillary endothelial cells of any of our patients. Fourteen patients (63.6%) were found to have myofibrillolysis.
All of the untreated and most of the treated IVS4 + 919G > A patients showed typical pathological changes of Fabry disease in their cardiomyocytes. No endothelial accumulation of Gb3 was found, which is similar to the findings of several previous reports regarding later-onset Fabry disease. This result highly suggests that the IVS4 + 919G > A is a real pathogenic later-onset Fabry mutation.
KeywordsEndomyocardial biopsy Enzyme replacement therapy Fabry disease IVS4 + 919G > A Left ventricular hypertrophy
Fabry disease (MIM 301500) is an X-linked lysosomal storage disorder resulting from deficient alpha-galactosidase A (α-Gal A) activity. The estimated incidence of classic Fabry disease is 1 in 40,000-60,000 males in the general population . The deficient α-Gal A activity results in progressive accumulation of glycosphingolipid, predominantly globotriaosylceramide (Gb3), in the walls of small blood vessels, nerves, dorsal root ganglia, renal glomerular and tubular epithelial cells, and cardiomyocytes. Clinical features in classically affected patients include acroparesthesia, angiokeratoma, and hypohidrosis in early childhood or adolescence and progress to renal insufficiency, cardiomyopathy, and cerebrovascular disease in adulthood [2–6]. Recently, several different later-onset phenotypes of Fabry disease have been identified, which have drawn the attention of more physicians [7–9]. Patients with later-onset Fabry disease have higher residual enzyme activities than those of the classical type. They lack the classic symptoms of Fabry disease and present relatively fewer or isolated symptoms such as hypertrophic cardiomyopathy, renal failure, or cryptogenic stroke at later stages in life [10–14]. The cardiac later-onset phenotype usually presents only with cardiac manifestations, such as hypertrophic cardiomyopathy, mitral insufficiency and/or arrhythmias in the fifth to eighth decade [12, 15, 16].
Due to the high prevalence of IVS4 + 919G > A mutation in our population, a new treatment guideline has been set up by the Bureau of National Health Insurance in Taiwan. All Fabry patients applying for enzyme replacement therapy (ERT) funding from the national health insurance have to receive an endomyocardial biopsy examination to demonstrate that Fabry disease is the primary cause of their hypertrophic cardiomyopathy. This guideline gives us the opportunity to observe a large series of cardiac pathologic changes in these patients with left ventricular hypertrophy and the IVS4 + 919G > A mutation.
Patients and methods
A total of 22 Fabry patients (17 males and 5 females, median age: 61 years old) with left ventricular hypertrophy carrying the IVS4 + 919G > A mutation were enrolled in this study. The demographic data, laboratory results, image results and pathologic findings of the endomyocardial biopsies were collected retrospectively from December 2012 to April 2013.
Five patients (nos.1-5) did not receive ERT before endomyocardial biopsy. The others had received agalsidase alfa (Replagal®, Shire) 0.2 mg/kg every other week as the enzyme replacement therapy for at least 8 months (range 8-40 months). Two patients (nos. 16 and 17) had initially received agalsidase beta (Fabrazyme®, Genzyme) 1 mg/kg every other week and then changed to Replagal® 0.2 mg/kg in 2009 owing to the global shortage of Fabrazyme.
The study complies with the Declaration of Helsinki and is approved by the medical ethics committee of Taipei Veteran General Hospital. Written informed consents were obtained.
GLA gene mutation
Blood samples were obtained from these patients in blood collecting tubes containing ethylene diamine tetraacetic acid, and samples were stored at 4°C. DNA was isolated from whole blood using the GFX genomic Blood DNA Purification Kit (Amersham Biosciences, UK) following the manufacturer’s instructions. The primer sets were used to amplify the sequences of seven GLA exons and the region including IVS4 + 919G > A [24, 25]. The polymerase chain reaction products were analyzed by 1.5% agarose I (Amresco) gel electrophoresis and then eluted in the polymerase chain reaction Advanced PCR Clean Up System (Viogene, USA.). Direct sequencing of the α-Gal A gene was processed using the BigDye Terminator v3.1 Cycle Sequencing Kit (Applied Biosystems) and ABI Prism 3730 Sequencer .
Plasma α-Gal A activity and Plasma LysoGb3
Plasma α-Gal A activity was determined using the substrate 4-methylumbelliferyl α-D-galactopyranoside (5 mmol/L) freshly prepared in 117 mmol/L N-acetyl-D-galactosamine/50 mmol/L citric-phosphate buffer, pH 4.6, before every assay. In brief, 50 μL of plasma was mixed with 300 μL of the substrate solution, incubated at 37°C for 2 hours, and 0.2 N glycine-NaOH was added to stop the reaction. Fluorescence intensity was measured with the excitation and emission wavelengths of 365 and 450 μm, respectively [27, 28]. Plasma LysoGb3 was detected by tandem mass spectrometry that was performed in positive ion mode (ES+) on a triple quadruple mass spectrometer (Quattro Ultima, Waters, Milford, MA) with NeoLynx software version 4.1. A multiple reaction monitoring (MRM) mode was used for the measurement of lysoGb3. The analyzing methods were modified from the protocol provided by Shire .
Echocardiography was performed routinely for the Fabry patients to check the hypertrophic cardiomyopathy. Left ventricular mass was calculated according to the Devereux cube formula and indexed to height2.7 (LVMI). Left ventricular hypertrophy by echocardiography was defined by a LVMI of >47 g/m2.7 in women or >50 g/m2.7 in men [30–32]. To avoid variability of LMVI measurements, only the results performed by two cardiologists specializing in echocardiography and measured with the same machine and protocol were used in this study.
Cardiac magnetic resonance imaging
Magnetic resonance imaging (MRI) of the heart was carried out as part of stand assessment on a 1.5 T scanner (Excite II; GE medical systems, Milwaukee, WI). Late enhancement (LE) technique by gadolinium-contrast cardiac MRI examination was applied for the later-onset Fabry patients for assessment of fibrosis. The participants underwent a scan with spin echo double IR T1WI and T2WI pulse sequences and Fiesta pulse sequence, on axial, coronal, and variable scanning plans. Images were acquired 10 minutes after the intravenous injection of gadolinium. The myocardial delayed enhancement protocol included the pre-Gd axial FIESTA cine and grid tagging in 8 mm slice, and the post-Gd myocardial delayed enhancement of short axis/four-chamber views in 8-mm slice and oblique axial cine of ascending aorta in 8-mm slice to detect changes in tissue integrity in the left ventricle myocardium [33–35]. Severe myocardial fibrosis was defined by at least two affected left ventricular segments, which are followed by the American heart association guideline , and mild myocardial fibrosis was defined by one segment affected.
Cardiac catheterization and endomyocardial biopsy
Right heart catheterization was approached via the right internal jugular vein under digital X-ray guidance. A flexible endomyocardial bioptome was inserted into the right ventricle and 2-3 specimens were obtained from interventricular septum and submitted to histological examination.
Cardiac specimens selected for light microscope were fixed in 10% buffered formalin, embedded in paraffin. The sections were cut from the paraffin block and stained with haematoxylin and eosin (H&E), and Masson’s trichrome. Cardiac specimens selected for electron microscope were fixed in 2.5% glutaraldehyde in phosphate buffer, post-fixed with 1% OsO4 in Sorenson’s phosphate buffer, followed by dehydration through a graded series of ethanol washes, and embedded in Spurr’s EPON. Semithin sections were cut from the block and stained with toluidine blue for adequate preview under a microscope. Ultrathin sections were prepared and examined under an electron microscope.
In the idealized model of a cardiomyocyte, as an elliptic cylinder, different diameters such as major axis (longest diameter) or minor axis (shortest diameter), etc. are measured, even in one transverse section of a cardiomyocyte. The current study revealed that, in the transverse section, the ratio between the major axis and minor axis of the cardiomyocytes is usually around 1.1 (11/10) . Therefore, the diameters of cardiomyocytes in transverse section can be approximately estimated. Because the minor axis of the transverse section of cardiomyocytes can be measured more easily and reliably than other diameters of the other axis, the diameter of the minor axis of the transverse section of cardiomyocytes was used to present the diameter of cardiomyocytes in several previous reports [38–41]. In accordance with these previous reports, we measured the minor axis at the nuclear level in transverse section to present the diameter of cardiomyocytes of our patients in this study. A total of 15 cells from 3 micrographs were measured for each sample. Control samples were retrospectively obtained from 8 anonymous patients who were provided by the department of pathology in our medical center. All the samples were obtained during the electrophysiology study for arrhythmia. None of these patients had any evidence of hypertrophic cardiomyopathy. All the histopathologic specimens were blindly reviewed by the same pathologist.
Data analysis and statistics
The data in some parts of the study were analyzed with descriptive statistics (mean, standard deviation). Due to the small number of patients and the uncontrolled nature of this study, no inferential statistics were used. Results are presented as actual measurements from individual patients. SPSS Version 20 (SPSS Inc, Chicago, Illinois, USA) was used for descriptive statistics.
The demographic data and clinical manifestations of the Fabry disease patients with IVS4 + 919G > A mutation
34.7 ± 4.4
Hyperlipidemia; Hepatitis B
21.8 ± 3.3
Coronary artery disease; Arrhythmia; Hepatitis C; Cholecystitis
31.5 ± 4.0
DM; Hypertension;ESRD s/p renal transplantation; Cholecystitis; Hyperuricemia
30.8 ± 5.6
Hypertension; Coronary artery disease; Hyperlipidemia; Hyperuricemia
33.5 ± 8.0
24.1 ± 2.4
Cubital tunnel syndrome
25.9 ± 2.8
Hypertension; DM; Duodenal ulcer
25.6 ± 7.0
Hyperlipidemia; Sick sinus syndrome
24.9 ± 3.6
Coronary artery disease; Fatty liver
21.1 ± 5.0
BPH; Bladder cancer; Osteoarthritis
21.6 ± 4.0
Hyperlipidemia; Arrhythmia s/p pacemaker
23.2 ± 3.4
26.2 ± 5.6
24.0 ± 5.4
24.2 ± 4.1
23.1 ± 4.1
Hypertension; DM; BPH
23.6 ± 3.8
Lung adenocarcinoma; Hypertension; Insomnia
24.6 ± 3.4
20.5 ± 3.3
Hypertension; Major depression
25.8 ± 6.9
23.5 ± 3.5
Chronic renal insufficiency; Hyperuricemia
23.5 ± 7.1
Recently, the later-onset phenotypes of Fabry disease were found to be about 10 times more frequent in most populations [1, 20, 42, 43]. Owing to the characteristics, the terminology “later-onset” Fabry disease might be more appropriate than “variant” Fabry disease. In fact, an increasing number of novel mutations have been found and believed to be later-onset mutations through high-risk patient screenings or newborn screenings. On the other hand, some mutations, which were previously thought to be later-onset mutations, have been proved to be non-pathogenic. The most noticeable example is the p,E66Q mutation (c.196G > C), a previously identified renal later onset type mutation, which has a very high prevalence rate in Japanese and Korean populations (0.5-1%) and which has now been proved by pathologic studies to be merely a single nucleotide polymorphism, not a pathogenic mutation . Therefore, it is insufficient to confirm a later onset mutation based on its enzyme activity and clinical manifestations such as hypertrophic cardiomyopathy or renal impairment.
Biomarkers, such as Gb3 or lyso-Gb3 were considered to be helpful to determine if the novel mutation is a true pathogenic mutation . However, several reports indicated that Gb3, and even lysoGb3 might be normal in certain Fabry patients who had developed significant clinical manifestations with the pathogenic mutations [45, 46]. Renal or cardiac biopsy can provide more information to identify if a novel mutation is a real pathogenic mutation. In the retrospective single-center direct observational study, we reviewed the endomyocardial biopsies of large numbers of later-onset Fabry patients with IVS4 + 919G > A mutation to prove this mutation is a real pathogenic mutation.
Cardiac biopsy of classical Fabry disease patients revealed significant Gb3 accumulation in both endothelium and cardiomyocytes [47–53]. Furthermore, the degree of endothelial Gb3 deposition was even used as a scoring system for monitoring the long-term cardiac therapeutic outcomes of ERT in classic Fabry disease (Thurberg, B.L. et al) . In contrast to classical Fabry disease, cardiac biopsy of the later-onset patients revealed that Gb3 accumulation was confined to the myocardium and did not involve endothelial cells . Other reports have also showed no endothelial Gb3 accumulation in later-onset Fabry disease [56–58]. Therefore, no endothelial Gb3 deposition is expected in later-onset Fabry patients. The cardiac biopsies of our patients showed significant Gb3 accumulation in their cardiomyocytes but not in endothelial cells. It could indicate that IVS4 + 919G > A mutation is a true later-onset Fabry mutation.
Interestingly, a high frequency of hypertension (12 of 22; 54%) and hyperlipidemia (7 of 22; 32%) were noted among these cardiomyopathic patients with the IVS4 + 919G > A mutation. In this study, we did not check other genetic causes of hypertrophic cardiomyopathy. Actually, the exact causal relationship of these factors with hypertrophic cardiomyopathy in our patients has not established. Because most of our patients did not have significant renal impairment, the hypertension was not likely caused by Fabry renopathy. Several studies have indicated that in addition to renal impairment, hypertension could be caused by the imbalance of the autonomic nervous system in patients with Fabry disease . Further studies are required to clarify the relationship between hypertension and the autonomic nervous imbalance in these patients. Furthermore, hypertension might be a predisposing factor to the development of hypertrophic cardiomyopathy for these later-onset Fabry disease patients, especially for the milder Fabry patients. The finding that four out of our five (80%) female patients had significant hypertension supports this finding. In addition, several IVS4 + 919G > A patients in our studies were found to be hypertensive. However, due to the small sample size in our study, we cannot make a definite conclusion regarding the relationship between hypertrophic cardiomyopathy and hypertension, more data will need to be collected and analyzed to clarify this point. Regarding predisposing factors for hypertrophic cardiomyopathy in later-onset Fabry patients, a recent important study, reported by Desnick et al., revealed that as many as 20% of male and 25% of females with later onset Fabry mutations and hypertrophic cardiomyopathy concurrently have a pathogenic or likely pathogenic mutation of the HCM causing gene. Therefore, in addition to Gb3 accumulation, there should be some predisposing factors contributing to the pathogenesis of later-onset Fabry cardiomyopathy.
Regarding hyperlipidemia in Fabry patients, circulating Gb3 has been proved to be primary transported by LDL and HDL lipoproteins (approximately 60% and 30% respectively) . Furthermore, hyperlipidemia was correlated with Fabry disease  and selective LDL-apheresis was shown to be an effective treatment in a Fabry patient with recurrent strokes . However, the causal relationship between hyperlipidemia and hypertrophic cardiomyopathy of later-onset Fabry patients still needs to be clarified.
Interestingly, only scanty Gb3 accumulation could be found in the cardiomyocytes of our three patients who had received the longest period of ERT. This finding is quite different from several previous studies that showed the histological clearance of Gb3 accumulation from cardiomyocytes is usually poor [38, 49, 54, 64]. Does this finding indicate that a longer duration of ERT still has efficacy for Gb3 clearance from cardiomyocytes of later-onset Fabry patients? However, without pre-ERT biopsies, it is impossible to claim ERT was able to clear Gb3 accumulation from the cardiomyocytes of these three patients. More cardiac biopsy data with pre-ERT and post-ERT should be collected to clarify this point.
Recent studies revealed that gadolinium-contrast cardiac MRI is a good method to assess myocardial fibrosis in Fabry disease [34, 65–67]. In patients without fibrosis, ERT resulted in a significant reduction in left ventricular mass and improvement of myocardial function. In contrast, patients with mild or severe fibrosis showed a minor reduction in left ventricular hypertrophy and no improvement in myocardial function. In this study, one patient was found to have significant interstitial fibrosis among his cardiomyocytes by H&E staining of endomyocardial biopsy. However, no significant fibrosis was observed in his heart with late-enhancement technique by gadolinium-contrast cardiac MRI examination. On the other hand, 6 out of the 20 patients received gadolinium-contrast cardiac MRI examination in this study were found to have severe fibrosis (Table 1), but none of them were found to have any significant cardiac fibrosis in their endomyocardial biopsies. This finding indicates that the histological fibrosis of interventricular septum from right ventricular endomyocardial biopsy does not reflect the severity of the fibrosis of the whole heart; most of the fibrosis that significantly affect heart function is usually located in the left ventricular area in Fabry disease.
In this study, we analyzed the pathologic appearance of cardiomyocytes by endomyocardial biopsies in 22 atypical later-onset Fabry disease patients with the Chinese mutation (IVS4 + 919G > A). These data suggest that IVS4 + 919G > A is a real pathogenic mutation with typical Gb3 accumulation and hypertrophic changes in cardiomyocytes. No endothelial Gb3 accumulation was found in cardiac biopsies is consistent with the cardiac pathologic findings of later-onset Fabry disease.
Fabry disease is a rare lysosomal disorder resulting from a genetic deficiency of α-Gal A. The present study used endomyocardial biopsies to confirm that the Chinese Fabry mutation (IVS4 + 919G > A) is a real pathogenic mutation.
The authors thank Ms. Tina, Wu and Mr. Hann-Tyng, Chang for their review and suggestion. The authors acknowledge the support from the industry-hospital cooperative research project between the Taipei Veterans General Hospital and Shire. Our center has received several research grants regarding Fabry disease from Shire Pharmaceuticals and Excelsior Biopharma. Shire had provided English language editing service for this manuscript. However, Shire had no role in the study design; the collection, analysis and interpretation of data; the writing of the manuscript; or the decision to submit the paper for publication. The opinions are those of the authors.
This work was partially supported by the National Science Council, Taiwan (No. NSC-100-2325-B-010-014) and Taipei Veterans General Hospital (No. V101C-129 and V101C-187).
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