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Wajcman H, de Brevern AG, Riou J, Latouche C, Marden MC, Pissard S. Short in-Frame Insertions/Deletions in the Coding Sequence of the α-Globin Gene. Consequences of the 3D Structure and Resulting Phenotypes: Hb Choisy as an Example. Hemoglobin 2019; 42:287-293. [PMID: 30700179 DOI: 10.1080/03630269.2018.1556683] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
Abstract
A small group of hemoglobin (Hb) variants result from 'in-frame' deletion/insertion (del/ins). We describe a new variant of this group (Hb Choisy), found on the α1 gene, which is the exact counterpart of a previously published deletional variant, Hb J-Biskra [codons 51-58 (or codons 52-59) (-24 bp) (-TCTGCCCAGGTTAAGGGCCACGGC); HBA1: c.157_180del (or HBA2)]. In Hb J-Biskra, the sequence Ser-Ala-Gln-Val-Lys-Gly-His-Gly located from positions α52(E1) to α59(E8) is deleted, while in Hb Choisy the same sequence (Ser-Ala-Gln-Val-Lys-Gly-His-Gly) is inserted at position α52(E1). The variant carrying the insertion appears to be less damaging than the one with the deletion. A possible explanation could be that the additional sequence is located in the C to E interhelical region, and is less disturbing to the general structure of the globin chain. This insertion/deletion (ins/del) is likely favored by the repetition, at an interval of 16 nucleotides, of an eight nucleotide sequence. Comparison of variants of this group, found in the HbVar database, shows that structural modifications resulting from insertions are frequently less damaging than that caused by deletions.
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Affiliation(s)
- Henri Wajcman
- a Institut National de la Sante et de la Recherche Médicale (INSERM) U 955 eq 2 , Institut Mondor de Recherche Biomoléculaire (IMRB) , Créteil , France
| | - Alexandre G de Brevern
- b Biologie Integree du Globule Rouge Unité Mixte de Recherche (UMR)-S1134, INSERM , Université Paris Diderot, Sorbonne, Paris Cite, Université de la Réunion, Université des Antilles , Paris , France.,c Institut National de la Transfusion Sanguine (INTS) , Paris , France.,e Laboratoire d'Excellence GR-Ex , Créteil , France
| | - Jean Riou
- d Assistance Publique-Hôpitaux de Paris (APHP), Département de Génétique , Hôpital Henri Mondor , Créteil , France
| | - Celine Latouche
- d Assistance Publique-Hôpitaux de Paris (APHP), Département de Génétique , Hôpital Henri Mondor , Créteil , France
| | - Michael C Marden
- a Institut National de la Sante et de la Recherche Médicale (INSERM) U 955 eq 2 , Institut Mondor de Recherche Biomoléculaire (IMRB) , Créteil , France.,e Laboratoire d'Excellence GR-Ex , Créteil , France
| | - Serge Pissard
- a Institut National de la Sante et de la Recherche Médicale (INSERM) U 955 eq 2 , Institut Mondor de Recherche Biomoléculaire (IMRB) , Créteil , France.,d Assistance Publique-Hôpitaux de Paris (APHP), Département de Génétique , Hôpital Henri Mondor , Créteil , France.,e Laboratoire d'Excellence GR-Ex , Créteil , France
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Israeli S, Sarig O, Garty BZ, Indelman M, Bergman R, Sprecher E, Goldberg I. Molecular Analysis of a Series of Israeli Families with Comèl-Netherton Syndrome. Dermatology 2014; 228:183-8. [DOI: 10.1159/000357560] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/14/2013] [Accepted: 11/26/2013] [Indexed: 11/19/2022] Open
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Bento C, Oliveira AC, Neves J, Gameiro M, Cunha E, Coucelo M, Costa RM, Barbot J, Costa E, Fernández-Lago C, Ribeiro ML. Hb Iberia [α104(G11)Cys → Arg,TGC>CGC (α2) (HBA2:c.313T>C)], a new α-thalassemic hemoglobin variant found in the Iberian Peninsula: report of six cases. Hemoglobin 2013. [PMID: 23181747 DOI: 10.3109/03630269.2012.742911] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
Abstract
We report a new structural defect of the α2-globin chain presenting with moderate microcytic hypochromic anemia, in six individuals from three unrelated families, living in Portugal and Spain. α-Globin gene deletions were ruled out by gap-polymerase chain reaction (gap-PCR) and multiplex ligation-dependent probe amplification (MLPA). Direct sequencing of the α2-globin gene revealed a substitution of codon 104 [α104(G11)Cys→Arg, TGC>CGC (α2) (HBA2:c.313T>C)]. This new variant, not detectable by high performance liquid chromatography (HPLC) or electrophoresis, was called Hb Iberia, as it was observed for the first time in families from the Iberian Peninsula. Although the mutant allele is transcribed, as indicated by the balanced mRNA α/β ratio, the abnormal α2 chain could not form a stable tetramer as the cysteine and arginine residues, located at the α1β1 contact, differ in size, charge and hydrophobicity. Hb Iberia is the third mutation described at codon 104 on the α-globin genes, namely, Hb Sallanches (α2, TGC>TAC) and Hb Oegstgeest (α1, TGC>AGC), also characterized as unstable hemoglobins (Hbs), present on an α-thalassemic phenotype.
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Affiliation(s)
- Celeste Bento
- Centro Hospitalar e Universitário de Coimbra, Serviço de Hematologia, Coimbra, Portugal.
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Chen YL. Capillary electrophoresis combining three-step multiplex polymerase chain reactions for diagnosing α-thalassemia. Electrophoresis 2010; 32:379-85. [DOI: 10.1002/elps.201000448] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/06/2010] [Revised: 11/11/2010] [Accepted: 11/11/2010] [Indexed: 11/11/2022]
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Steiner LA, Van Hoff J, Kutlar F, Gallagher PG. Aplastic Crisis Revealing the Diagnosis of Hb Evans [α62(E11)Val→Met,GTG→ATG (α2)] in a Hispanic Kindred: Case Report and Review. Hemoglobin 2009; 31:409-16. [DOI: 10.1080/03630260701590301] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/19/2023]
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Wajcman H, Traeger-Synodinos J, Papassotiriou I, Giordano PC, Harteveld CL, Baudin-Creuza V, Old J. Unstable and Thalassemic α Chain Hemoglobin Variants: A Cause of Hb H Disease and Thalassemia Intermedia. Hemoglobin 2009; 32:327-49. [DOI: 10.1080/03630260802173833] [Citation(s) in RCA: 84] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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Traeger-Synodinos J, Papassotiriou I, Metaxotou-Mavrommati A, Vrettou C, Stamoulakatou A, Kanavakis E. Distinct phenotypic expression associated with a new hyperunstable alpha globin variant (Hb heraklion, alpha1cd37(C2)Pro>0): comparison to other alpha-thalassemic hemoglobinopathies. Blood Cells Mol Dis 2000; 26:276-84. [PMID: 11042028 DOI: 10.1006/bcmd.2000.0307] [Citation(s) in RCA: 19] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
Clinical phenotypes associated with abnormal globin chain biosynthesis may result in thalassemia (deficient quantity) or hemolytic anemia (abnormal hemoglobins). However, the phenotypic expression of hyperunstable hemoglobin variants often includes features of thalassemia, along with variable peripheral hemolysis. Hemoglobinopathies caused by highly unstable beta-chain variants have a dominant thalassemia-like phenotype, in which carriers have a clinical expression of thalassemia intermedia, but highly unstable alpha-globin variants are usually only phenotypically apparent when they interact with other alpha-thalassemia mutations. In a child with clinical and hematological features consistent with beta-thalassemia intermedia, DNA analysis excluded any beta-globin gene mutations but characterized a novel deletion cd37(C2)Pro>0 (Hb Heraklion) in the alpha1 globin gene, in trans to a common Mediterranean nondeletion alpha-thalassemia mutation (alpha(Hph)alpha). The deletion of proline at alpha37(C2) is predicted to result in severe instability of the variant hemoglobin, which on interaction with a synthesis-deficient alpha-thalassemia mutation causes a relatively severe dyserythropoietic anemia, representing an alternative phenotype associated with highly unstable alpha-chain variants. Hb Heraklion is the fourth highly unstable alpha-globin variant that we have observed in patients from Greece and Albania. Two variants involve the alpha2-globin gene: Hb Agrinio (alpha29(B10)Leu>Pro) and Hb Adana (alpha59(E8)Gly>Asp), and two the alpha1-gene: Hb Aghia Sophia (alpha62(E11)Val>0) and (Hb Heraklion a37(C2)Pro>0). Each has been observed on interaction with a different alpha-thalassemia mutation and the phenotypes associated with these highly unstable alpha-variants are presented.
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Affiliation(s)
- J Traeger-Synodinos
- First Department of Pediatrics, University of Athens, St. Sophia's Children's Hospital, Athens, 11527, Greece
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