Abstract
Although often considered a single-entity, chronic kidney disease (CKD) comprises many pathophysiologically distinct disorders that result in persistently abnormal kidney structure and/or function, and encompass both monogenic and polygenic aetiologies. Rare inherited forms of CKD frequently span diverse phenotypes, reflecting genetic phenomena including pleiotropy, incomplete penetrance and variable expressivity. Use of chromosomal microarray and massively parallel sequencing technologies has revealed that genomic disorders and monogenic aetiologies contribute meaningfully to seemingly complex forms of CKD across different clinically defined subgroups and are characterized by high genetic and phenotypic heterogeneity. Investigations of prevalent genomic disorders in CKD have integrated genetic, bioinformatic and functional studies to pinpoint the genetic drivers underlying their renal and extra-renal manifestations, revealing both monogenic and polygenic mechanisms. Similarly, massively parallel sequencing-based analyses have identified gene- and allele-level variation that contribute to the clinically diverse phenotypes observed for many monogenic forms of nephropathy. Genome-wide sequencing studies suggest that dual genetic diagnoses are found in at least 5% of patients in whom a genetic cause of disease is identified, highlighting the fact that complex phenotypes can also arise from multilocus variation. A multifaceted approach that incorporates genetic and phenotypic data from large, diverse cohorts will help to elucidate the complex relationships between genotype and phenotype for different forms of CKD, supporting personalized medicine for individuals with kidney disease.
Key points
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Chronic kidney disease (CKD) is a complex disorder comprising many rarer, pathophysiologically distinct conditions that encompass both monogenic and polygenic forms, which share the common feature of leading to persistent anomalies in renal structure and/or function.
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Rare hereditary causes of CKD often show high phenotypic heterogeneity, which can result from pleiotropy, incomplete penetrance or variable expressivity.
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Microarray and massively parallel sequencing studies have shown that both genomic disorders and monogenic diseases account for a meaningful proportion of cases across different clinical subtypes of CKD.
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Copy number variants at the 17q12, 22q11.2 and 16p11.2 loci are recurrent genomic disorders among patients with CKD and display diverse and highly variable multiorgan manifestations, which can reflect gene dosage sensitivity and epistatic and epigenetic effects.
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Although classically considered to be clinically homogeneous, common monogenic causes of CKD, such as autosomal-dominant polycystic kidney disease, type IV collagen-associated nephropathy and autosomal-dominant tubulointerstitial kidney disease, display variable penetrance and expressivity, in part due to gene- and allele-level variation.
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Multilocus variation, involving variants for multiple genetic conditions, can confer complex phenotypes and has been detected in at least 5% of positive cases from genome-wide testing.
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Novel techniques that integrate genetic sequencing, experimental assays and clinical data, such as reverse phenotyping, functional screening of potentially pathogenic variants, and genetic and phenotypic risk scores, will support greater understanding of the phenotypic complexity of different forms of CKD.
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Acknowledgements
The work of the authors is supported by grants from the US National Institutes of Health (1F30DK116473 (E.E.G.) and 2R01DK080099, R01DK082753 and U54DK104309 (A.G.G.)).
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A.G.G. has served as a consultant for the AstraZeneca Center for Genomics Research and for Goldfinch Bio. The other authors declare no competing interests.
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Glossary
- Heritability
-
The proportion of interindividual variation in a trait that is caused by genetic factors.
- Private variants
-
Genetic variants unique to a single individual (that is, variants not observed in other individuals).
- Phenocopy
-
A phenotype that bears resemblance to the phenotype resulting from a particular genotype but occurs in an individual who does not harbour that genotype.
- Pleiotropy
-
Variation in a single gene influencing multiple phenotypic traits.
- Incomplete penetrance
-
Penetrance is the proportion of individuals with a particular genotype who display the associated phenotype. In the case of incomplete penetrance, not all individuals with the genotype manifest the associated phenotype.
- Variable expressivity
-
Expressivity refers to the extent to which individuals with a given genetic disease display the associated phenotype and thus reflects the range of phenotypes associated with the genotype. Variable expressivity describes a situation wherein affected individuals display the associated phenotype to differing extents.
- Papillorenal syndrome
-
Also known as renal coloboma syndrome. A disorder resulting from pathogenic variants in PAX2 characterized by kidney disease and ophthalmological anomalies; other manifestations may include sensorineural hearing loss, soft skin and ligamentous laxity.
- Oligogenic inheritance
-
A form of inheritance in which transmission of a phenotypic trait is mediated by multiple different genetic loci.
- Digenic inheritance
-
A form of inheritance in which transmission of a phenotypic trait is mediated by two different genetic loci.
- Structural variants
-
Large (≥1-kb) DNA variants; these alterations can be balanced (for example, inversions or reciprocal translocations, with no overall change in the amount of DNA at the relevant locus) or imbalanced (for example, copy number variants), which lead to gain or loss of DNA at the relevant locus.
- Single nucleotide variants
-
Alterations of single bases (nucleotides) in a DNA sequence; single nucleotide variants can lead to a different amino acid sequence in the encoded protein (non-synonymous variants) or leave the sequence unchanged (synonymous variants).
- Insertions or deletions
-
Gains or losses in the number of bases in a DNA sequence versus the reference sequence at that site, producing a different amino acid sequence in the encoded protein.
- Copy number variants
-
(CNVs). Structural variants that lead to gain (duplications) or loss (deletions) of DNA at the relevant locus.
- Genic copy number variants
-
Copy number variants that contain protein-coding regions of the genome (that is, genes).
- Locus
-
A specific site in the genome (plural: loci).
- Haploinsufficiency
-
A condition resulting from inactivation of one copy of a gene for which two copies are needed for normal gene function; for such haploinsufficient genes, gene function is thus altered in heterozygotes, as the remaining (functional) copy does not produce sufficient gene product for normal function.
- Meiotic non-allelic homologous recombination
-
Exchange of genetic material (DNA) between homologous regions located on different loci during meiosis.
- Epistatic interactions
-
Interaction between multiple different loci, wherein the phenotypic impact of the genotype at one locus depends on the genotype at other loci.
- Mobile genetic elements
-
DNA sequences that can move from their original site and integrate into another, different region of the genome
- Retrotransposition
-
Insertion of a DNA sequence at a new site in the genome using an RNA intermediate: the DNA sequence is first transcribed into RNA, and the RNA is then reverse transcribed into DNA, which is then inserted at the new site.
- Mosaic variants
-
Genetic variants that are present in a mosaic form — that is, the genotype at that locus is present within a certain proportion of an individual’s cells, such that they have multiple genetically different cell populations, with different genotypes at that locus.
- Pseudohomology
-
The state in which the DNA sequence of a (protein-coding) gene is highly similar to the DNA sequence of a pseudogene (that is, a copy of the gene that is not transcribed or translated, and thus does not yield a protein), because they both originate from the same ancestral gene.
- Synonymous variants
-
DNA sequence changes in the protein-coding (exonic) regions of the genome that do not alter the amino acid in the associated encoded proteins.
- Sanger sequencing
-
A method of DNA sequencing that uses labelled chain-terminating dideoxynucleotides to detect the nucleotides in the DNA strand being sequenced. This method yields a sequence chromatogram, which can subsequently be analysed to identify genetic variants.
- Sequencing coverage and read depths
-
In this Review, sequencing coverage refers to the percentage of bases in the DNA region targeted by sequencing that is sequenced a given number of times. Sequencing depth denotes the average number of times that a given nucleotide is read in a set of DNA sequence reads. Higher coverage and depth means that more of the targeted genomic region has been sampled a greater number of times, increasing the technical accuracy of the resulting data.
- Hemizygous
-
The condition in which an individual has a single copy of a pair of chromosomes or a segment of a chromosome pair, rather than two copies. This occurs for genes located on the X chromosome among human males, as their sex chromosomes comprise one X chromosome and one Y chromosome
- Saturation editing
-
A technique that replaces a DNA sequence in a gene of interest with variant DNA sequences encoding alternative amino acids in order to generate all possible amino acid substitutions at that site in the protein. The impact of each of the mutations on wild-type (non-mutated/normal) protein function can then be evaluated through various high-throughput screening assays (for example, for a gene encoding a kinase enzyme, assessing its ability to phosphorylate its substrate).
- Transthyretin amyloidosis
-
A disorder resulting from systemic amyloid deposition in organs including the heart, liver, nervous system and kidney owing to mutations in TTR.
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Groopman, E.E., Povysil, G., Goldstein, D.B. et al. Rare genetic causes of complex kidney and urological diseases. Nat Rev Nephrol 16, 641–656 (2020). https://doi.org/10.1038/s41581-020-0325-2
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DOI: https://doi.org/10.1038/s41581-020-0325-2
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