BabyScreen+ newborn screening
Gene: GCDH Green List (high evidence)Green List (high evidence)
Well established gene-disease association.
Typically presents in infancy, though later presentations also reported.
In neonates and infants, unspecific neurologic symptoms such as muscular hypotonia and delayed motor development occur in about half of all individuals with GA-I, the remaining individuals are asymptomatic. Macrocephaly occurs in approximately 75% of individuals. Untreated, 80-90% of infants will develop neurologic disease during brain development (mainly between 3 and 36 months) following an acute encephalopathic crisis precipitated by illness, vaccination, or surgical intervention. These crises characteristically result in the gradual development of complex movement disorders in the following months and years. Dystonia at rest with action-induced exacerbation, which profoundly interferes with any voluntary movement, is often incapacitating. Dysarthria and dysphagia are also common. Cognitive function in generally considered to be preserved; however comprehensive studies on cognitive functions in GA-I have not been reported. Given the characteristic cerebral abnormalities frequently observed in GA-I and the impact of similar white matter changes observed in other neurologic diseases, individuals with GA-I might be at risk for cognitive dysfunction. In approximately 10-20% of individuals with “insidious onset” type, neurologic disease and striatal injury occur in the absence of encephalopathic crises.
Treatment: avoid fasting, carnitine, protein restricted diet, restrict lysine, hydroxylysine, and tryptophan
Non-genetic confirmatory testing: urine organic acids, leukocyte enzyme activityCreated: 29 Sep 2022, 7:27 a.m. | Last Modified: 29 Sep 2022, 7:27 a.m.
Panel Version: 0.270
Mode of inheritance
BIALLELIC, autosomal or pseudoautosomal
Phenotypes
Glutaric aciduria, type I MIM#231670
Publications
Green List (high evidence)
is on the current VCGS newborn screening panelCreated: 26 Sep 2022, 2:13 a.m. | Last Modified: 26 Sep 2022, 2:13 a.m.
Panel Version: 0.199
Mode of inheritance
BIALLELIC, autosomal or pseudoautosomal
Tag metabolic tag was added to gene: GCDH.
Gene: gcdh has been classified as Green List (High Evidence).
Tag treatable tag was added to gene: GCDH.
gene: GCDH was added gene: GCDH was added to gNBS. Sources: BeginNGS,BabySeq Category A gene,Expert Review Green Mode of inheritance for gene: GCDH was set to BIALLELIC, autosomal or pseudoautosomal Phenotypes for gene: GCDH were set to Glutaric aciduria, type I, MIM#231670
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.