IthaID: 2487
Names and Sequences
| Functionality: | Globin gene causative mutation | Pathogenicity: | Pathogenic / Likely Pathogenic |
|---|---|---|---|
| Common Name: | CD 31 AGG>GGG [Arg>Gly] | HGVS Name: | HBA2:c.94A>G |
| Hb Name: | Hb Maranon | Protein Info: | α2 31(B12) Arg>Gly |
Also known as:
Comments: This mutation causes the activation of a cryptic splice site located 49 bp upstream of the exon1-intron1 boundary in both HBA2 long and short isoforms, thus generating a frameshift and a premature termination codon between codons 48 and 49 in the second exon. In Hb Maranon, instability is due to the substituted Arg residue at position 12 of the B helix of the alpha2-globin chain that seems to alter the hydrophobic environment required for the distal heme binding, causing an alpha-thalassemia phenotype.
We follow the HGVS sequence variant nomenclature and IUPAC standards.
External Links
Phenotype
| Hemoglobinopathy Group: | Thalassaemia and Structural Haemoglobinopathy |
|---|---|
| Hemoglobinopathy Subgroup: | α-thalassaemia, α-chain variant |
| Allele Phenotype: | α⁺ |
| Stability: | Hyperunstable |
| Oxygen Affinity: | N/A |
| Associated Phenotypes: | N/A |
Location
| Chromosome: | 16 |
|---|---|
| Locus: | NG_000006.1 |
| Locus Location: | 33869 |
| Size: | 1 bp |
| Located at: | α2 |
| Specific Location: | Exon 1 |
Other details
| Type of Mutation: | Point-Mutation(Substitution) |
|---|---|
| Effect on Gene/Protein Function: | Cryptic splice site (mRNA Processing), Missense codons (Protein Structure) |
| Ethnic Origin: | Indian |
| Molecular mechanism: | Altered α1β1 interface |
| Inheritance: | Recessive |
| DNA Sequence Determined: | Yes |
In silico pathogenicity prediction
Publications / Origin
- Qadah T, Finlayson J, Joly P, Ghassemifar R, Molecular and cellular analysis of a novel HBA2 mutation (HBA2: c.94A > G) shows activation of a cryptic splice site and generation of a premature termination codon., Hemoglobin , 38(1), 13-8, 2014
- de la Fuente-Gonzalo F, Nieto JM, Ricard P, Anguita J, Martínez R, Cervera A, Villegas A, González FA, Ropero P, Hb Cervantes, Hb Marañón, Hb La Mancha and Hb Goya: Description of 4 new haemoglobinopathies., Clin. Biochem. , 48(10), 662-7, 2015
Created on 2014-06-04 16:23:14,
Last reviewed on 2017-05-30 09:56:13 (Show full history)
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