IthaID: 3306

Names and Sequences

Functionality: Globin gene causative mutation Pathogenicity: Pathogenic / Likely Pathogenic
Common Name: CD 25/26 -GTG [-Gly] HGVS Name: HBB:c.77_79delGTG
Hb Name: Hb M Dothan Protein Info: β 25(B7) - 26(B8) Gly-Glu->0 AND inserted Glu

Context nucleotide sequence:

Also known as: Hb Higashitochigi, Hb HT

Comments: Hb M-Dothan associates with the methemoglobin (Met-Hb) phenotype due to a 3 bp deletion causing a single amino acid [-Gly] deletion in the B-helix (B7/B8) of the β globin chain. The in-frame deletion disrupts the close spatial relation between the helical segments B and E and, as a result, indirectly distorts the heme pocket on the E-helix. Found in a young Japanese boy and a 9-months American boy, both presenting with cyanosis.

We follow the HGVS sequence variant nomenclature and IUPAC standards.

External Links


Hemoglobinopathy Group: Structural Haemoglobinopathy
Hemoglobinopathy Subgroup: β-chain variant
Allele Phenotype:Methemoglobinaemia
Stability: Unstable
Oxygen Affinity: Decreased Oxygen Affinity
Associated Phenotypes: N/A


Chromosome: 11
Locus: NG_000007.3
Locus Location: 70671
Size: 3 bp
Located at: β
Specific Location: Exon 1

Other details

Type of Mutation: Point-Mutation(Deletion)
Effect on Gene/Protein Function: N/A
Ethnic Origin: Japanese, American
Molecular mechanism: N/A
Inheritance: Recessive
DNA Sequence Determined: Yes

In silico pathogenicity prediction

Sequence Viewer

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Publications / Origin

  1. Fujisawa K, Yamashiro Y, Hattori Y, Ohha Y, Kajita T, Kageyama S, Arita J, Hb Higashitochigi (Hb Ht) [ beta 24(B6) or beta 25(B7) glycine deleted]: a new unstable variant expressing cyanosis., Hemoglobin, 17(5), 467-73, 1993 PubMed
  2. Kutlar F, Hilliard LM, Zhuang L, Patel N, Eroglu B, Meiler SE, Carmichael H, Russell RB, Kutlar A, Hb M Dothan [beta 25/26 (B7/B8)/(GGT/GAG-->GAG//Gly/Glu-->Glu]; a new mechanism of unstable methemoglobin variant and molecular characteristics., Blood Cells Mol. Dis. , 43(3), 235-8, 2009 PubMed
Created on 2018-02-06 17:23:02, Last reviewed on 2024-03-07 11:08:32 (Show full history)

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