IthaID: 3745

Names and Sequences

Functionality: Globin gene causative mutation Pathogenicity: Pathogenic / Likely Pathogenic
Common Name: IVS I-1 G>A HGVS Name: HBA2:c.95+1G>A
Hb Name: N/A Protein Info: N/A

Context nucleotide sequence:

Also known as:

Comments: Found in patients with microcytosis and hypochromia. In the presence of the G>A mutation, a cryptic splice site 49 bp upstream of the exon1/intron 1 boundary is activated and a premature stop codon is introduced between codons 48 and 49 in exon 2. As this premature stop codon is located 152 nts upstream of the last exon-exon junction, the mature mRNA may be degraded by the nonsense mediated decay mechanism or further processed to produce a truncated nonfunctional protein.

We follow the HGVS sequence variant nomenclature and IUPAC standards.

External Links


Hemoglobinopathy Group: Thalassaemia
Hemoglobinopathy Subgroup: α-thalassaemia
Allele Phenotype:α⁺
Associated Phenotypes: N/A


Chromosome: 16
Locus: NG_000006.1
Locus Location: 33871
Size: 1 bp
Located at: α2
Specific Location: Intron 1

Other details

Type of Mutation: Point-Mutation(Substitution)
Effect on Gene/Protein Function: Cryptic splice site (mRNA Processing), Frameshift (Translation)
Ethnic Origin: Canadian, Italian
Molecular mechanism: N/A
Inheritance: Recessive
DNA Sequence Determined: Yes

In silico pathogenicity prediction

Sequence Viewer

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Publications / Origin

  1. Waye JS, Eng B, Dutly F, Frischknecht H, alpha-Thalassemia caused by two novel splice mutations of the alpha2-globin gene: IVS-I-1 (G>A and G>T)., Hemoglobin, 33(6), 519-22, 2009 PubMed
  2. Qadah T, Finlayson J, Ghassemifar R, In vitro characterization of the α-thalassemia point mutation HBA2:c.95+1G>A [IVS-I-1(G>A) (α2)]., Hemoglobin, 36(1), 38-46, 2012 PubMed
Created on 2021-02-17 16:56:30, Last reviewed on 2022-07-12 11:40:09 (Show full history)

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