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Original ArticlesNephrolithiasis
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Prevalence of Monogenic Causes in Pediatric Patients with Nephrolithiasis or Nephrocalcinosis

Daniela Anne Braun, Jennifer Ashley Lawson, Heon Yung Gee, Jan Halbritter, Shirlee Shril, Weizhen Tan, Deborah Stein, Ari J. Wassner, Michael A. Ferguson, Zoran Gucev, Brittany Fisher, Leslie Spaneas, Jennifer Varner, John A. Sayer, Danko Milosevic, Michelle Baum, Velibor Tasic and Friedhelm Hildebrandt
CJASN April 2016, 11 (4) 664-672; DOI: https://doi.org/10.2215/CJN.07540715
Daniela Anne Braun
*Division of Nephrology, Department of Medicine and
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Jennifer Ashley Lawson
*Division of Nephrology, Department of Medicine and
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Heon Yung Gee
*Division of Nephrology, Department of Medicine and
†Department of Pharmacology, Brain Korea 21 PLUS Project for Medical Sciences, Yonsei University College of Medicine, Seoul, Republic of Korea;
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Jan Halbritter
*Division of Nephrology, Department of Medicine and
‡Division of Endocrinology/Nephrology, Department of Internal Medicine, University Clinic Leipzig, Leipzig, Germany;
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Shirlee Shril
*Division of Nephrology, Department of Medicine and
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Weizhen Tan
*Division of Nephrology, Department of Medicine and
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Deborah Stein
*Division of Nephrology, Department of Medicine and
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Ari J. Wassner
§Division of Endocrinology, Department of Medicine, Boston Children’s Hospital, Harvard Medical School, Boston, Massachusetts;
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Michael A. Ferguson
*Division of Nephrology, Department of Medicine and
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Zoran Gucev
║Department of Pediatric Nephrology, Medical Faculty Skopje, University Children's Hospital, Skopje, Macedonia;
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Brittany Fisher
*Division of Nephrology, Department of Medicine and
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Leslie Spaneas
*Division of Nephrology, Department of Medicine and
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Jennifer Varner
*Division of Nephrology, Department of Medicine and
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John A. Sayer
¶Institute of Genetic Medicine, International Centre for Life, Newcastle University, Newcastle upon Tyne, United Kingdom;
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Danko Milosevic
**Department of Pediatric Nephrology, Dialysis and Transplantation, Clinical Hospital Center Zagreb, University of Zagreb Medical School, Zagreb, Croatia; and
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Michelle Baum
*Division of Nephrology, Department of Medicine and
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Velibor Tasic
║Department of Pediatric Nephrology, Medical Faculty Skopje, University Children's Hospital, Skopje, Macedonia;
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Friedhelm Hildebrandt
*Division of Nephrology, Department of Medicine and
††Howard Hughes Medical Institute, Chevy Chase, Maryland
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Abstract

Background and objectives Nephrolithiasis is a prevalent condition that affects 10%–15% of adults in their lifetime. It is associated with high morbidity due to colicky pain, the necessity for surgical intervention, and sometimes progression to CKD. In recent years, multiple monogenic causes of nephrolithiasis and nephrocalcinosis have been identified. However, the prevalence of each monogenic gene in a pediatric renal stone cohort has not yet been extensively studied.

Design, setting, participants, & measurements To determine the percentage of cases that can be explained molecularly by mutations in one of 30 known nephrolithiasis/nephrocalcinosis genes, we conducted a high-throughput exon sequencing analysis in an international cohort of 143 individuals <18 years of age, with nephrolithiasis (n=123) or isolated nephrocalcinosis (n=20). Over 7 months, all eligible individuals at three renal stone clinics in the United States and Europe were approached for study participation.

Results We detected likely causative mutations in 14 of 30 analyzed genes, leading to a molecular diagnosis in 16.8% (24 of 143) of affected individuals; 12 of the 27 detected mutations were not previously described as disease causing (44.4%). We observed that in our cohort all individuals with infantile manifestation of nephrolithiasis or nephrocalcinosis had causative mutations in recessive rather than dominant monogenic genes. In individuals who manifested later in life, causative mutations in dominant genes were more frequent.

Conclusions We present the first exclusively pediatric cohort examined for monogenic causes of nephrolithiasis/nephrocalcinosis, and suggest that important therapeutic and preventative measures may result from mutational analysis in individuals with early manifestation of nephrolithiasis or nephrocalcinosis.

  • genetic renal disease
  • kidney stones
  • hypercalciuria
  • nephrocalcinosis
  • mutation
  • child
  • Europe
  • exons
  • genes, dominant
  • humans

Introduction

The incidence of pediatric nephrolithiasis and nephrocalcinosis (NL/NC) has significantly increased over the last several decades (1). Furthermore, this condition is associated with high morbidity due to episodes of colicky pain, the necessity for surgical intervention, and sometimes progression to CKD. Nephrolithiasis (NL) and nephrocalcinosis (NC) share a recognized degree of heritability. In twin studies, heritability accounted for nearly half of all NL/NC prevalence (2,3). According to the Online Mendelian Inheritance in Man (OMIM) database, mutations in at least 30 genes can cause monogenic forms of NL/NC by autosomal recessive, autosomal dominant, or X-linked transmission. Recently, we studied 166 adults and 106 children with NC or NL and detected causative mutations in 11.4% of adult and 20.8% of early-onset cases (4). This result confirmed a significant occurrence of heritable NL/NC, while also indicating that there are additional unidentified monogenic causes of NL/NC.

However, the contribution of monogenic causes of NL/NC has yet to be extensively studied. Because pediatric patients are more likely to have a monogenic cause of disease, mutational analysis is particularly relevant in this cohort. Furthermore, early detection of disease-causing mutations is of great importance in early-onset NL/NC because genetic diagnoses allow finely tailored treatment plans that may prevent recurrent disease or progression to ESRD.

Until recently, mutation analysis for individuals with NL/NC has not been widely accessible. However, through the availability of high-throughput multiplex PCR and next-generation sequencing, rapid mutation analysis of multiple genes in large cohorts has become an efficient and cost-effective screening method (5–7).

To identify the prevalence of monogenic causes in early-onset NL/NC (onset before 18 years of age), we analyzed all coding exons and adjacent splice sites of 30 known NL/NC-causing genes with a defined OMIM phenotype in a cohort of 143 children recruited at three renal stone clinics with at least one episode of NL or the presence of NC upon renal ultrasound before 18 years of age. This patient cohort had no patient overlap with the previously published cohort (4).

Materials and Methods

Study Cohort

This study was approved by the Institutional Review Board of Boston Children’s Hospital. Study inclusion criteria were defined as: first clinical manifestation of NL and/or presence of NC on renal ultrasound before 18 years of age. Individuals with conditions or medication that might have caused secondary renal stone disease were excluded. To avoid selection bias, all patients seen at three renal stone clinics (Boston Children’s Hospital, University Clinic Skopje, and University Clinic Zagreb) over a finite period (February–August 2014) were approached for study participation. The exact percentage of individuals who declined study participation was not recorded. After obtaining informed consent, clinical data, pedigree information, and DNA samples were collected from 143 individuals. All individuals were recruited after the conclusion of the study of Halbritter et al. (4), thereby excluding enrollment overlap between the two studies. The cohort consisted of 72 male and 71 female participants. Of these individuals, 123 had NL, 20 had NC based on renal ultrasound, and three with NC also had reported NL.

Mutation Analysis

Mutation analysis was performed using a barcoded multiplex PCR-based approach, as previously described (5,6). We designed 518 target-specific primers for 381 coding exons and the adjacent splice sites of 30 genes that are known monogenic causes of NL/NC (defined by OMIM; www.ncbi.nlm.nih.gov/omim). The genes screened were: ADCY10, AGXT, PRT, ATP6V0A4, ATP6V1B1, CA2, CASR, CLCN5, CLCNKB, CLDN16, CLDN19, CYP24A1, FAM20A, GRHPR, HNF4A, HOGA1, HPRT1, KCNJ1, OCRL, SLC12A1, SLC22A12, SLC2A9, SLC34A1, SLC34A3, SLC3A1, SLC4A1, SLC7A9, SLC9A3R1, VDR, and XDH (Supplemental Tables 1 and 2). Amplicon sizes were chosen to range from 250 to 300 bp (primer sequences are available from the authors). The use of barcoded multiplex PCR (Fluidigm 48.48-Access Arrays system) allowed parallel amplification of all 518 amplicons in 48 individuals at a time (5,6). Subsequently, the pooled libraries were sequenced on an Illumina MiSeq instrument using the v2 chemistry. Sequence reads were aligned to the human reference sequence using CLC Genomics Workbench (CLC-bio, Aarhus, Denmark) (5). Prior to further evaluation, we excluded synonymous variants and variants that occur with minor allele frequency >1% in the dbSNP (version 138) database. Remaining variants were validated as previously described (7). Briefly, all variants that had previously been described in individuals with NL/NC were considered as likely to be disease causing. Novel variants were ranked based on their likelihood to be deleterious for the function of the encoded protein considering protein truncation and obligatory splice site mutations as likely to be disease causing. For missense alleles, evolutionary conservation among orthologs across phylogeny, and bioinformatics prediction programs (PolyPhen-2 [8], SIFT [9], and MutationTaster [10]) were taken into consideration. All variants that were present in the homozygous state in healthy control cohorts (Exome Aggregation Consortium and Exome Variant Server) were excluded. The remaining variants were confirmed in original patient DNA by Sanger sequencing. Whenever parental DNA was available, segregation analysis was performed. Final calling of variant pathogenicity was performed by geneticists together with physician scientists, who had knowledge of the clinical phenotypes and pedigree structure.

Coverage Statistics

We achieved a median sequencing coverage of 194× per individual, and 197× per amplicon. As previously published, median coverage values >20× are sufficient to exclude false-negative results in high-throughput exon sequencing (5,6). In this study, only eight of 143 individuals (5.7%), and 37 of 518 amplicons (7.1%) had a median coverage <20×. This value is average for next-generation sequencing; hence, this experiment fulfilled the necessary quality criteria.

Web Resources

Online resources used were as follows:

  • UCSC Genome Browser, http://genome.ucsc.edu/cgi-bin/hgGateway;

  • 1000 Genomes Browser, http://browser.1000genomes.org;

  • Ensembl Genome Browser, http://www.ensembl.org;

  • Exome Variant Server, http://evs.gs.washington.edu/EVS;

  • Exome Aggregation Consortium, exac.broadinstitute.org;

  • OMIM, http://www.omim.org;

  • PolyPhen-2, http://genetics.bwh.harvard.edu/pph2 (8);

  • SIFT, http://sift.jcvi.org (9); and

  • MutationTaster http://www.mutationtaster.org (10).

Results

We examined an international cohort of 143 individuals with early-onset NL or NC for the presence of mutations in 30 genes that cause NL/NC if mutated. We detected mutations in 14 of these 30 genes and established a molecular diagnosis likely to explain the disease phenotype in 24 of 143 unrelated individuals with NL/NC (16.8%) (Tables 1 and 2). Pathogenic mutations were detected in nine recessive genes in 13 individuals: ATP6V1B1 (one individual), ATP6V0A4 (one individual), CLDN16 (one individual), CLDN19 (one individual), SLC3A1 (three individuals), CYP24A1 (two individuals), SLC12A1 (one individual), AGXT (one individual), and OCRL (two individuals) (Figure 1, Table 1). We also detected pathogenic mutations in five dominant genes in 11 individuals: ADCY10 (two individuals), SLC4A1 (one individual), SLC9A3R1 (one individual), SLC34A1 (five individuals), and VDR (two individuals) (Figure 1, Table 2).

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Table 1.

Molecular genetic diagnoses established in 13 of 143 (9.1%) individuals from 143 families with NL/NC in one of nine recessive or X-linked genes

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Table 2.

Molecular genetic diagnoses established in 11 of 143 (7.7%) individuals from 143 families with NL/NC in one of five dominant genes

Figure 1.
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Figure 1.

Established molecular diagnoses in 24 of 143 (16.8%) individuals with nephrolithiasis/nephrocalcinosis (NL/NC). A flow chart showing the distribution for molecular diagnoses of nephrolithiasis (NL) or nephrocalcinosis (NC), and for recessive and dominant inheritance. aBy renal ultrasound. b“Solved” denotes that two recessive or one dominant mutation(s) were/was detected that explain the disease phenotype of NL or NC.

No pathogenic mutations were detected in genes APRT, CA2, CASR, CLCN5, CLCNKB, FAM20A, GRHPR, HNF4A, HOGA1, HPRT1, KCNJ1, SLC2A9, SLC22A12, SLC34A3, SLC7A9, and XDH. Of the 27 detected mutations, 12 (44.4%) were novel pathogenic variants that have not been previously reported in databases of human disease-causing mutations. In this study, no additional functional studies were performed to validate the pathogenicity of these alleles.

To determine a possible correlation between sex and monogenic causes of disease, we analyzed the sex of the molecularly solved individuals normalized to that of the cohort. The cohort consisted of 72 males and 71 females. Among individuals with pathogenic mutations, 13 were male and 11 were female (Tables 1 and 2), resulting in no significant difference in the detection of pathogenic mutations between sexes.

We observed that in the infantile subgroup of five individuals <1 year of age when the disease first manifested, all individuals (five of five) had pathogenic mutations in a recessive gene (Figure 2), including ATP6V0A4, SLC3A1, CYP24A1, SLC12A1, and AGXT. No individual in this age group had a pathogenic mutation in a dominant gene (Figure 2). Among the subgroup of 19 individuals >1 year, eight of 19 (42.1%) individuals had a pathogenic mutation in a recessive gene (Figure 2), including ATP6V1B1, CLDN16, CLDN19, SLC3A1, CYP24A1, or OCRL. The remaining 11 of 19 (57.9%) individuals had a pathogenic mutation in a dominant gene, including ADYC10, SLC4A1, SLC9A3R1, SLC34A1, or VDR (Figure 2). These results show that in our cohort recessive causes of disease were more frequent in infantile-onset NL/NC, whereas dominant causes were more frequent thereafter.

Figure 2.
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Figure 2.

Distribution of established molecular genetic causes of nephrolithiasis/nephrocalcinosis (NL/NC). Number of individuals with molecular diagnoses grouped by age of onset, and genetic heritability (recessive versus dominant). Note that, in the infantile subgroup, recessive diagnoses are more frequent, whereas in patients >1 year at onset of disease dominant diagnoses are more frequent.

Discussion

Pediatric-onset NL and NC are often overlooked clinical conditions that frustrate both clinicians and families. In recent years, multiple monogenic causes of NL/NC have been identified (11–28), but the prevalence of mutations in each monogenic gene in a pediatric NL/NC cohort has not yet been extensively studied.

Here, we performed mutational analysis in a cohort of 143 individuals with NL or NC onset before 18 years of age. We sequenced the coding regions of 30 genes known to cause monogenic NL/NC, and identified a causative mutation in 24 of 143 individuals (16.8%). This percentage confirms the findings of Halbritter et al. who identified a monogenic cause of NL/NC in 20.8% of children in a separate/nonoverlapping mixed adult and pediatric cohort (4). However, participants for both studies were recruited in specialized renal stone clinics at tertiary care centers where most children with NL/NC are seen. Therefore, the cohort may have a certain bias toward severe cases and future studies might show that the percentage of monogenic causes in isolated NL/NC is lower than observed in this study.

The monogenic causes of NL/NC reported in the literature are very heterogeneous (11–28). This heterogeneity is evident in our cohort, in which causative mutations were distributed among 14 of the 30 genes screened. This finding demonstrates that broad genetic screening, as performed in this study, is necessary to establish a molecular diagnosis in monogenic cases of early-onset NL/NC.

We analyzed the age distribution of individuals in whom we identified a causative mutation. Recessive monogenic diseases typically manifest earlier in life than dominant monogenic diseases (4) and our results reflect this finding for monogenic causes of NL/NC. As shown in Figure 2, all individuals with infantile manifestation of NL/NC in our cohort harbored causative mutations in recessive rather than dominant monogenic genes. In contrast, causative mutations in dominant monogenic genes were more frequently observed in individuals in whom the disease manifested later in life.

In recessive cases, we observed a surprisingly high number of homozygous (ten of 13) as compared with compound heterozygous (three of 13) mutations. We therefore revisited all respective cases to specifically exclude parental consanguinity. However, none of these children were knowingly born of consanguineous unions. Consequently, at this time we cannot provide a satisfying explanation for this phenomenon.

A major challenge of high-throughput mutational analysis is to differentiate between pathogenic mutations and benign variants. We distinguished between alleles that had previously been described in individuals with NL/NC, and thus were likely to be causative, and novel variants. Novel variants were only considered as likely to be disease causing if they were protein-truncating, affected highly conserved amino acid residues, were predicted to be damaging in bioinformatics prediction programs, and were not present in the homozygous state in healthy control individuals.

The gene SLC34A1 was originally reported as an autosomal-dominant disease gene (23). However, multiple groups later questioned the pathogenicity of single heterozygous alleles in SLC34A1 (29–31). At this point, the pathogenicity of single heterozygous alleles in SLC34A1, as identified in five individuals with NL/NC in this study, cannot be clarified definitely.

Heritability has been suggested to account for nearly 50% of NL/NC cases (2,3). The study of Halbritter et al. has shown that known NL/NC genes account for 11.4% of adult-onset NL/NC and 20.8% of early-onset NL/NC (4). These percentages indicate that many more NL/NC-associated genes remain to be identified. Monogenic conditions, particularly recessive conditions, are commonly not appreciated as being of genetic origin because many appear as sporadic cases, since the parents will be healthy heterozygous carriers of one mutated allele. However, with approximately one in five NL/NC patients harboring monogenic mutations, there are many indicators of inherited disease that clinicians should be aware of. Examples of such indicators are: early onset, familial prevalence, familial consanguinity, multiple or recurrent stones, and NC. An in-depth discussion of when to suspect a genetic condition in NL/NC is outside the scope of this publication, however, other groups have reviewed this in great detail (32).

A molecular genetic diagnosis has vast implications for both affected individuals and unaffected family members. As addressed in Tables 1 and 2, genetic screening of asymptomatic relatives may identify individuals carrying the same disease-causing mutation. Because molecular genetic screening in healthy relatives of individuals with monogenic disease is generally discouraged, we initially refrained from performing mutation analysis in healthy relatives. However, following identification of certain causative mutations in affected individuals, the resulting knowledge might have important prophylactic implications for currently unaffected family members. In these situations we recommend that affected individuals initiate discussion on genetic counseling and/or mutation analysis for healthy relatives at risk (Tables 1 and 2). Ultimately, information resulting from mutation analysis will guide clinicians to monitor individuals for development of disease and to institute preventative treatment when possible.

Furthermore, consensus guidelines recommend standard treatment for NL/NC, such as increased fluid intake, limited sodium intake, treatment with thiazide diuretics, and potassium citrate therapy (33), that may not directly address the pathophysiology of a particular molecular diagnosis. For example, although standard measures may address NC associated with CLDN16 mutations, with a definite molecular diagnosis clinicians will also know to monitor for tetany and seizures, which have been reported for certain CLDN16 mutations (Table 1). Therefore, we suggest “Practical Implications” (Tables 1 and 2) for each gene in which we detected a likely disease-causing mutation.

In conclusion, we have shown that mutations in a heterogeneous array of genes can be identified in 16.8% of individuals with early-onset NL/NC, and we suggest that specific genetic diagnoses in such cases hold vast potential for personalization of treatment plans. Therefore, genetic screening should be implemented in the clinical practice of pediatric patients with NL or NC, because knowledge of the molecular diagnosis may change the approach to prophylaxis and treatment.

Disclosures

None.

Acknowledgments

We thank the physicians and the participating families for their contribution. F.H. is an Investigator of the Howard Hughes Medical Institute, a Doris Duke Distinguished Clinical Scientist, and the Warren E. Grupe Professor of Pediatrics.

This research was supported by grants from the National Institutes of Health (DK1069274, DK1068306, and DK064614 to F.H.), and by the March of Dimes Foundation (6-FY11-241 to F.H.). H.Y.G. was supported by the Basic Science Research Program through the National Research Foundation of Korea by the Ministry of Education (2015R1D1A1A01056685).

Footnotes

  • Published online ahead of print. Publication date available at www.cjasn.org.

  • This article contains supplemental material online at http://cjasn.asnjournals.org/lookup/suppl/doi:10.2215/CJN.07540715/-/DCSupplemental.

  • Received July 12, 2015.
  • Accepted December 2, 2015.
  • Copyright © 2016 by the American Society of Nephrology

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Clinical Journal of the American Society of Nephrology: 11 (4)
Clinical Journal of the American Society of Nephrology
Vol. 11, Issue 4
April 07, 2016
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Prevalence of Monogenic Causes in Pediatric Patients with Nephrolithiasis or Nephrocalcinosis
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Prevalence of Monogenic Causes in Pediatric Patients with Nephrolithiasis or Nephrocalcinosis
Daniela Anne Braun, Jennifer Ashley Lawson, Heon Yung Gee, Jan Halbritter, Shirlee Shril, Weizhen Tan, Deborah Stein, Ari J. Wassner, Michael A. Ferguson, Zoran Gucev, Brittany Fisher, Leslie Spaneas, Jennifer Varner, John A. Sayer, Danko Milosevic, Michelle Baum, Velibor Tasic, Friedhelm Hildebrandt
CJASN Apr 2016, 11 (4) 664-672; DOI: 10.2215/CJN.07540715

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Prevalence of Monogenic Causes in Pediatric Patients with Nephrolithiasis or Nephrocalcinosis
Daniela Anne Braun, Jennifer Ashley Lawson, Heon Yung Gee, Jan Halbritter, Shirlee Shril, Weizhen Tan, Deborah Stein, Ari J. Wassner, Michael A. Ferguson, Zoran Gucev, Brittany Fisher, Leslie Spaneas, Jennifer Varner, John A. Sayer, Danko Milosevic, Michelle Baum, Velibor Tasic, Friedhelm Hildebrandt
CJASN Apr 2016, 11 (4) 664-672; DOI: 10.2215/CJN.07540715
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