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Gene: HBA2 Red List (low evidence)I don't know
Well established gene-disease association. The alpha-thalassemia phenotype ranges from asymptomatic to lethal. The severity of the disorder is usually well correlated with the number of non-functional copies of the alpha-globin genes (HBA1/HBA2). Gene function can be lost by deletion, or by SNVs (total loss or partial).The clinically relevant forms of alpha-thalassemia usually involve alpha(0)-thalassemia, either coinherited with alpha(+)-thalassemia and resulting in HbH disease, or inherited from both parents and resulting in haemoglobin Bart hydrops fetalis.
Note: Deletions are well known and frequent cause of these alpha thalassemia phenotypes and subtypes. Diverse range of non-deletional HBA2 variants also described. Possible technological challenge due to deletions which are prevalent.Created: 14 Aug 2024, 2:24 a.m. | Last Modified: 14 Aug 2024, 2:24 a.m.
Panel Version: 1.159
Mode of inheritance
BIALLELIC, autosomal or pseudoautosomal
Phenotypes
Thalassemias, alpha- MIM#604131; Hemoglobin H disease, nondeletional MIM#613978
Publications
Red List (low evidence)
Comment when marking as ready: Discussed again: remains technically challenging therefore not suitable for inclusion. Other screening publicly available in pregnancy.Created: 24 Apr 2025, 5:41 a.m. | Last Modified: 24 Apr 2025, 5:41 a.m.
Panel Version: 1.2125
Technically challenging due to variant spectrum. Reproductive carrier screening at population level already in place.Created: 9 Sep 2022, 5:53 a.m. | Last Modified: 9 Sep 2022, 5:53 a.m.
Panel Version: 0.189
Mode of inheritance
BIALLELIC, autosomal or pseudoautosomal
Red List (low evidence)
Haemoglobinopathies of alpha-globin can result from variants at either of the 2 alpha-globin loci, HBA1 or HBA2.
Note deletions are common.
Sources: LiteratureCreated: 25 Jul 2022, 2:34 a.m.
Mode of inheritance
BOTH monoallelic and biallelic, autosomal or pseudoautosomal
Phenotypes
Erythrocytosis 7, MIM# 617981; Heinz body anaemia, MIM# 140700; Haemoglobin H disease, deletional and nondeletional, MIM# 613978; Thalassaemia, alpha-, MIM# 604131
Tag SV/CNV tag was added to gene: HBA2.
Gene: hba2 has been classified as Red List (Low Evidence).
Tag for review was removed from gene: HBA2.
Publications for gene: HBA2 were set to
Tag for review tag was added to gene: HBA2.
Gene: hba2 has been classified as Red List (Low Evidence).
Mode of inheritance for gene: HBA2 was changed from BOTH monoallelic and biallelic, autosomal or pseudoautosomal to BIALLELIC, autosomal or pseudoautosomal
Gene: hba2 has been classified as Red List (Low Evidence).
Tag for review was removed from gene: HBA2.
Tag for review tag was added to gene: HBA2.
gene: HBA2 was added gene: HBA2 was added to Reproductive Carrier Screen_VCGS. Sources: Literature Mode of inheritance for gene: HBA2 was set to BOTH monoallelic and biallelic, autosomal or pseudoautosomal Phenotypes for gene: HBA2 were set to Erythrocytosis 7, MIM# 617981; Heinz body anaemia, MIM# 140700; Haemoglobin H disease, deletional and nondeletional, MIM# 613978; Thalassaemia, alpha-, MIM# 604131 Review for gene: HBA2 was set to RED
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.