Genomic technologies have had a greater impact on paediatrics than on many other fields of medicine, and this discipline is leading the way in the implementation of clinical genomics.
Appropriate use of whole-exome sequencing (WES) or whole-genome sequencing (WGS) has the potential to curtail the diagnostic process for patients with rare and ultra-rare paediatric disorders, often avoiding the need for invasive and expensive investigations.
Although WES and WGS have enormous diagnostic power, data interpretation remains very challenging because of a high incidence of novel and ultra-rare benign variants, incomplete knowledge, false assignment of variant pathogenicity and even false association of genes with disease in the literature.
An accurate genetic diagnosis benefits a child by enabling a better understanding of their prognosis, more personalized treatment and tailored management and surveillance. A precise genetic diagnosis also enables accurate genetic advice for individuals and their relatives with increased reproductive choice and improved access to information and support from patient support groups, education, health and social care.
WES and WGS require considerable computational resources to process, analyse and store the vast data sets generated by these technologies. For clinicians, the issue of data storage and access is linked to the question of whether their duty of care is limited to finding a diagnosis for the child's immediate problems or whether it extends beyond the scope of the initial investigation.
In the future, stratified therapy for rare paediatric disease based on the specific genetic diagnosis is likely to be possible, and effective and affordable therapies are likely to become available through drug repurposing and innovation.
The majority of rare diseases affect children, most of whom have an underlying genetic cause for their condition. However, making a molecular diagnosis with current technologies and knowledge is often still a challenge. Paediatric genomics is an immature but rapidly evolving field that tackles this issue by incorporating next-generation sequencing technologies, especially whole-exome sequencing and whole-genome sequencing, into research and clinical workflows. This complex multidisciplinary approach, coupled with the increasing availability of population genetic variation data, has already resulted in an increased discovery rate of causative genes and in improved diagnosis of rare paediatric disease. Importantly, for affected families, a better understanding of the genetic basis of rare disease translates to more accurate prognosis, management, surveillance and genetic advice; stimulates research into new therapies; and enables provision of better support.
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The authors are all members of the management team of the Deciphering Developmental Disorders (DDD) Study, which undertakes independent research commissioned by the Health Innovation Challenge Fund [grant number HICF-1009-003], a parallel funding partnership between the Wellcome Trust and the Department of Health, and the Wellcome Trust Sanger Institute [grant number WT098051]. The views expressed in this publication are those of the authors and not necessarily those of the Wellcome Trust or the Department of Health. The study has UK Research Ethics Committee approval (10/H0305/83, granted by the Cambridge South REC, and GEN/284/12 granted by the Republic of Ireland REC). The research team acknowledges the support of the National Institute for Health Research, through the Comprehensive Clinical Research Network. This study makes use of DECIPHER, which is funded by the Wellcome Trust. H.V.F. is supported by The Wellcome Trust award 200990/Z/16/Z 'Designing, developing and delivering integrated foundations for genomic medicine'.
The authors declare no competing financial interests.
- Developmental disorders
Diseases with their genesis in embryonic life or early fetal brain development.
- Structural variants
Blocks of DNA >1 kb that differ relative to the reference genome or general population, including inversions, balanced translocations and copy number variants (for example, deletions and duplications).
The presence of two or more populations of cells with different genotypes in an individual who has developed from a single fertilized egg.
The proportion of individuals with a particular genotype who show features of the condition (however mildly). If some individuals with the genotype never show any features, the condition is said to have incomplete (or reduced) penetrance. If features develop with age, the condition is said to have age-dependent penetrance.
The phenotypic variability and severity that a given genotype shows in individuals penetrant for the condition.
- Locus heterogeneity
When variants in a number of different genes independently cause the same phenotype.
- Allelic heterogeneity
When different mutations at the same locus cause the same phenotype.
Describes a mutation that affects only one copy of a gene. Autosomal dominant, de novo dominant or X-linked disorders are caused by a monoallelic pathogenic variant.
- Biallelic variants
Mutations that affect both copies of a gene. Autosomal recessive disorders are caused by pathogenic biallelic variants.
- Whole-exome sequencing
(WES). Next-generation sequencing of the entire protein-coding portion of the genome. In humans, the total length of coding and splicing regions is estimated to be ~35 Mb and comprises ~20,000 genes (1–2% of the genome).
- Whole-genome sequencing
(WGS). Next-generation sequencing of the entire genome, which, in humans, is typically ~3,000 Mb.
- Single-gene tests
Approaches that enable detailed analysis of a single gene. In addition to sequence analysis, they usually also include an assessment of dosage in order to detect exon-level deletions and duplications, which are often difficult to detect with current approaches to whole-exome sequencing and whole-genome sequencing.
- Cytogenetic tests
Genome-wide tests that analyse the number and structure of chromosomes, including copy number variants, but do not provide information about the DNA sequence.
The chromosomal complement of a cell. Large-scale chromosomal imbalances can be detected using karyotyping approaches, such as imaging Giemsa-banded chromosomes with light microscopy.
- Copy number variants
(CNVs). Structural variants that involve either a deletion or a duplication of a section of DNA relative to the reference genome.
- Single nucleotide variants
(SNVs). Differences within a population, or between an individual and a reference genome, that affect a single base pair of DNA.
- Gene panels
Subsets of genes (usually linked to a particular phenotype) that are incorporated into a laboratory-based gene capture kit or that form the basis of computer-based virtual gene panels, which are applied to a subset of variant data from a clinical exome or a whole-exome sequencing and/or whole-genome sequencing assay.
- Minor allele frequencies
(MAFs). Measurements of how often the less common allele occurs at a given polymorphic locus.
- Human Phenotype Ontology
(HPO). A standardized vocabulary of phenotypic abnormalities encountered in human disease. Each term in the HPO describes a phenotypic abnormality, such as atrial septal defect. The HPO currently contains ~11,000 terms.
- Causative genotypes
Genotypes in which a single locus is perturbed and that have a high positive predictive value for a restricted pattern of morphological, biochemical or physiological features of clinical significance.
- Blended phenotype
A mixed phenotype that results from causal variants in two or more genes. The phenotypes may either be distinct, with discrete (composite) manifestations, or overlapping, with similar phenotypic manifestations that are impossible to disentangle.
- Genetic risk scores
Quantitative measures of genetic predisposition to a trait that are calculated from data for multiple (usually low-risk) genetic variants, which are usually obtained from genome-wide association studies.
The phenomenon whereby variants in a single gene may cause multiple phenotypic expressions or disorders.
A global approach for looking at gene expression patterns. This can involve measurements of thousands of genes simultaneously with microarrays or measurements of small numbers of genes that are facilitated by global sequence information from expressed sequence tag or genome-sequencing projects.
A global approach for looking at the complete collection of epigenetic marks, such as DNA methylation and histone modifications, and other molecules that can transmit epigenetic information, such as non-coding RNAs, that exist in a cell at any given point in time.
A global approach using quantitative analytical methods to look at the entire metabolic content of a cell or organism at a given time.
A global approach for looking at the complete collection of proteins in a cell or tissue at a given time.
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Wright, C., FitzPatrick, D. & Firth, H. Paediatric genomics: diagnosing rare disease in children. Nat Rev Genet 19, 253–268 (2018). https://doi.org/10.1038/nrg.2017.116
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