Fetal anomalies
Gene: AMBRA1 Amber List (moderate evidence)I don't know
Comment on list classification: New gene added by Zornitza Stark. Sufficient unrelated cases and supportive functional data. However, only a single publication linking this gene to human disease at present (PMID:32333458). Segregation data was not provided and penetrance remains unclear. AMBRA1 was investigated by targeted sequencing and so there also is a possibility of variants in other genes.
Currently the evidence is insufficient for a Green rating, but this may be revised if further cases/clinical evidence arise (added 'watchlist' tag)Created: 26 Jan 2021, 3:34 p.m. | Last Modified: 26 Jan 2021, 3:34 p.m.
Panel Version: 1.183
- PMID: 32333458 (2020) - 5 missense variants were identified in 6 Han Chinese patients with neural tube defects including parietal/occipital encephalocele and/or spina bifida. In vitro and in vivo (zebrafish) assays showed that 4 variants affected autophagy initiation to various degrees. The fifth variant had no effect on autophagosome formation and was able to rescue the ambra1a‐MO knockdown phenotype in zebrafish as same as WT mRNA.
However, the variants were detected by targeted sequencing and no segregation data was available for any of the cases. 3 variants were also found at low frequencies (MAF: 8e‐6 to 5.785e‐5) in control databases, ExAC or gnomAD. There are no further reports linking AMBRA1 to human disease.
- PMID: 17589504 (2007) - Ambra1 null mice displayed severe neural tube defects and embryonic lethality associated with autophagy impairmentCreated: 26 Jan 2021, 3:18 p.m. | Last Modified: 26 Jan 2021, 3:18 p.m.
Panel Version: 1.182
Mode of inheritance
MONOALLELIC, autosomal or pseudoautosomal, NOT imprinted
Phenotypes
Neural tube defects
Publications
Green List (high evidence)
5 rare missense variants were identified in 6 cases from a neural tube defect cohort, and 4 (p.Thr80Met, p.Leu274Phe, p.Ser743Phe, and p.Met884Val) of them were functionally validated to affect autophagy regulation in vitro or zebrafish embryo development in vivo. There is also null mouse model with neural tube defects.
Sources: LiteratureCreated: 3 Aug 2020, 11:07 a.m.
Mode of inheritance
MONOALLELIC, autosomal or pseudoautosomal, NOT imprinted
Phenotypes
Neural tube defects
Publications
Variants in this GENE are reported as part of current diagnostic practice
Gene: ambra1 has been classified as Amber List (Moderate Evidence).
Tag watchlist tag was added to gene: AMBRA1.
gene: AMBRA1 was added gene: AMBRA1 was added to Fetal anomalies. Sources: Literature Mode of inheritance for gene: AMBRA1 was set to MONOALLELIC, autosomal or pseudoautosomal, NOT imprinted Publications for gene: AMBRA1 were set to 17589504; 32333458 Phenotypes for gene: AMBRA1 were set to Neural tube defects Review for gene: AMBRA1 was set to GREEN gene: AMBRA1 was marked as current diagnostic
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 [email protected]
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.