IthaID: 278

Names and Sequences

Functionality: Globin gene causative mutation Pathogenicity: Pathogenic / Likely Pathogenic
Common Name: Poly A (-AATAA) HGVS Name: HBB:c.*110_*114del
Hb Name: N/A Protein Info: N/A

Context nucleotide sequence:

Also known as: polyA (-TAAAA)

Comments: A 5 bp deletion of the polyA signal sequence (AATAAA>A). Found in a homozygous state in an Arab child from Gaza and in a proband from Egypt, both with transfusion-dependent β-thalassaemia major. Found as a compound heterozygote with Hb S in a proband from Nigeria.

We follow the HGVS sequence variant nomenclature and IUPAC standards.

External Links


Hemoglobinopathy Group: Thalassaemia
Hemoglobinopathy Subgroup: β-thalassaemia
Allele Phenotype:β+
Associated Phenotypes: Haemolytic anaemia [HP:0001878]
Ineffective erythropoiesis [HP:0010972]


Chromosome: 11
Locus: NG_000007.3
Locus Location: 72128
Size: 5 bp
Located at: β
Specific Location: 3'UTR, Poly(A)

Other details

Type of Mutation: Point-Mutation(Deletion)
Effect on Gene/Protein Function: RNA cleavage - Poly(A) signal (mRNA Processing)
Ethnic Origin: Arab/Palestinian, Egyptian, Nigerian
Molecular mechanism: N/A
Inheritance: Recessive
DNA Sequence Determined: No

In silico pathogenicity prediction


Publications / Origin

  1. Rund D, Dowling C, Najjar K, Rachmilewitz EA, Kazazian HH, Oppenheim A, Two mutations in the beta-globin polyadenylylation signal reveal extended transcripts and new RNA polyadenylylation sites., Proceedings of the National Academy of Sciences of the United States of America, 89(10), 4324-8, 1992
  2. el-Kalla S, Mathews AR, A significant beta-thalassemia heterogeneity in the United Arab Emirates., Hemoglobin, 21(3), 237-47, 1997
  3. Lacan P, Ponceau B, Aubry M, Francina A, Mild Hb S-beta(+)-thalassemia with a deletion of five nucleotides at the polyadenylation site of the beta-globin gene., Hemoglobin, 27(4), 257-9, 2003
Created on 2010-06-16 16:13:15, Last reviewed on 2020-10-02 10:21:09 (Show full history)

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