Mendeliome
Gene: VRK1 Green List (high evidence)Green List (high evidence)
Complex phenotype with mixed peripheral and central neurological features. Two families reported where PCH was prominent and accompanied by ataxia. At least three families also reported where peripheral neuropathy dominated the clinical picture without PCH/ataxia.
Further delineation of phenotype 2021:
PMID 34169149: expanding spectrum of neurologic disorders associated with VRK1. Two Hispanic individuals, one homozygous (R321C: VUS and LP/P in ClinVar) and one cHet (R321C+V236M, latter P and more recently VUS in ClinVar), with slowly progressive weakness and a clinical syndrome consistent with adult-onset spinal muscular atrophy WITHOUT pontocerebellar atrophy. No hom in gnomAD and both have been reported in cHet individuals with other features: R321C in association with adult-onset amyotrophic lateral sclerosis and V236M with rapidly progressive sensorimotor polyneuropathy and microcephaly. Authors suggest PMID 26583493 and 31837156 have similar reports. PMID 26583493 reports a 32yo Hispanic individual, cHet H119R+R321C, with early-onset amyotrophic lateral sclerosis, 5 years progressive weakness. PMID 31837156 reports two patients with adult-onset length-dependent motor neuropathy from unrelated consanguineous families of Moroccan Jewish descent, both hom for R387H.Created: 16 Apr 2020, 7:07 a.m. | Last Modified: 2 Aug 2021, 8:21 a.m.
Panel Version: 0.8606
Mode of inheritance
BIALLELIC, autosomal or pseudoautosomal
Phenotypes
Pontocerebellar hypoplasia type 1A, MIM# 607596; Adult-onset spinal muscular atrophy without pontocerebellar hypoplasia; Neuronopathy, distal hereditary motor, autosomal recessive 10, MIM# 620542
Publications
Phenotypes for gene: VRK1 were changed from Pontocerebellar hypoplasia type 1A, MIM# 607596; Adult-onset spinal muscular atrophy without pontocerebellar hypoplasia to Pontocerebellar hypoplasia type 1A, MIM# 607596; Adult-onset spinal muscular atrophy without pontocerebellar hypoplasia; Neuronopathy, distal hereditary motor, autosomal recessive 10, MIM# 620542
Phenotypes for gene: VRK1 were changed from Pontocerebellar hypoplasia type 1A, MIM# 607596; SMA to Pontocerebellar hypoplasia type 1A, MIM# 607596; Adult-onset spinal muscular atrophy without pontocerebellar hypoplasia
Publications for gene: VRK1 were set to 19646678; 21937992; 25609612; 24126608; 27281532
Gene: vrk1 has been classified as Green List (High Evidence).
Phenotypes for gene: VRK1 were changed from to Pontocerebellar hypoplasia type 1A, MIM# 607596; SMA
Publications for gene: VRK1 were set to
Mode of inheritance for gene: VRK1 was changed from Unknown to BIALLELIC, autosomal or pseudoautosomal
gene: VRK1 was added gene: VRK1 was added to Mendeliome_VCGS. Sources: Expert Review Green,Victorian Clinical Genetics Services Mode of inheritance for gene: VRK1 was set to Unknown
If promoting or demoting a gene, please provide comments to justify a decision to move it.
Genes included in a Genomics England gene panel for a rare disease category (green list) should fit the criteria A-E outlined below.
These guidelines were developed as a combination of the ClinGen DEFINITIVE evidence for a causal role of the gene in the disease(a), and the Developmental Disorder Genotype-Phenotype (DDG2P) CONFIRMED DD Gene evidence level(b) (please see the original references provided below for full details). These help provide a guideline for expert reviewers when assessing whether a gene should be on the green or the red list of a panel.
A. There are plausible disease-causing mutations(i) within, affecting or encompassing an interpretable functional region(ii) of this gene identified in multiple (>3) unrelated cases/families with the phenotype(iii).
OR
B. There are plausible disease-causing mutations(i) within, affecting or encompassing cis-regulatory elements convincingly affecting the expression of a single gene identified in multiple (>3) unrelated cases/families with the phenotype(iii).
OR
C. As definitions A or B but in 2 or 3 unrelated cases/families with the phenotype, with the addition of convincing bioinformatic or functional evidence of causation e.g. known inborn error of metabolism with mutation in orthologous gene which is known to have the relevant deficient enzymatic activity in other species; existence of an animal model which recapitulates the human phenotype.
AND
D. Evidence indicates that disease-causing mutations follow a Mendelian pattern of causation appropriate for reporting in a diagnostic setting(iv).
AND
E. No convincing evidence exists or has emerged that contradicts the role of the gene in the specified phenotype.
(i)Plausible disease-causing mutations: Recurrent de novo mutations convincingly affecting gene function. Rare, fully-penetrant mutations - relevant genotype never, or very rarely, seen in controls. (ii) Interpretable functional region: ORF in protein coding genes miRNA stem or loop. (iii) Phenotype: the rare disease category, as described in the eligibility statement. (iv) Intermediate penetrance genes should not be included.
It’s assumed that loss-of-function variants in this gene can cause the disease/phenotype unless an exception to this rule is known. We would like to collect information regarding exceptions. An example exception is the PCSK9 gene, where loss-of-function variants are not relevant for a hypercholesterolemia phenotype as they are associated with increased LDL-cholesterol uptake via LDLR (PMID: 25911073).
If a curated set of known-pathogenic variants is available for this gene-phenotype, please contact us at panelapp@genomicsengland.co.uk
We classify loss-of-function variants as those with the following Sequence Ontology (SO) terms:
Term descriptions can be found on the PanelApp homepage and Ensembl.
If you are submitting this evaluation on behalf of a clinical laboratory please indicate whether you report variants in this gene as part of your current diagnostic practice by checking the box
Standardised terms were used to represent the gene-disease mode of inheritance, and were mapped to commonly used terms from the different sources. Below each of the terms is described, along with the equivalent commonly-used terms.
A variant on one allele of this gene can cause the disease, and imprinting has not been implicated.
A variant on the paternally-inherited allele of this gene can cause the disease, if the alternate allele is imprinted (function muted).
A variant on the maternally-inherited allele of this gene can cause the disease, if the alternate allele is imprinted (function muted).
A variant on one allele of this gene can cause the disease. This is the default used for autosomal dominant mode of inheritance where no knowledge of the imprinting status of the gene required to cause the disease is known. Mapped to the following commonly used terms from different sources: autosomal dominant, dominant, AD, DOMINANT.
A variant on both alleles of this gene is required to cause the disease. Mapped to the following commonly used terms from different sources: autosomal recessive, recessive, AR, RECESSIVE.
The disease can be caused by a variant on one or both alleles of this gene. Mapped to the following commonly used terms from different sources: autosomal recessive or autosomal dominant, recessive or dominant, AR/AD, AD/AR, DOMINANT/RECESSIVE, RECESSIVE/DOMINANT.
A variant on one allele of this gene can cause the disease, however a variant on both alleles of this gene can result in a more severe form of the disease/phenotype.
A variant in this gene can cause the disease in males as they have one X-chromosome allele, whereas a variant on both X-chromosome alleles is required to cause the disease in females. Mapped to the following commonly used term from different sources: X-linked recessive.
A variant in this gene can cause the disease in males as they have one X-chromosome allele. A variant on one allele of this gene may also cause the disease in females, though the disease/phenotype may be less severe and may have a later-onset than is seen in males. X-linked inactivation and mosaicism in different tissues complicate whether a female presents with the disease, and can change over their lifetime. This term is the default setting used for X-linked genes, where it is not known definitately whether females require a variant on each allele of this gene in order to be affected. Mapped to the following commonly used terms from different sources: X-linked dominant, x-linked, X-LINKED, X-linked.
The gene is in the mitochondrial genome and variants within this can cause this disease, maternally inherited. Mapped to the following commonly used term from different sources: Mitochondrial.
Mapped to the following commonly used terms from different sources: Unknown, NA, information not provided.
For example, if the mode of inheritance is digenic, please indicate this in the comments and which other gene is involved.