Identification of three new nucleotide substitutions in the ß-globin gene: laboratoristic approach and impact on genetic counselling for beta-thalassaemia.
Eur J Haematol
; 92(5): 444-9, 2014.
Article
em En
| MEDLINE
| ID: mdl-24401016
ABSTRACT
PURPOSE:
Over the past two decades, a wide range of available methods for DNA analysis have allowed us to identify defects in globin genes associated with haemoglobin disorders and to correlate specific mutations with phenotypic expression. The purpose of this study was to evaluate the nature of three new nucleotide changes, mutation or single nucleotide polymorphism, found in the beta-globin gene, to conduct an appropriate genetic counselling. PATIENTS ANDMETHODS:
We report the molecular study performed in three probands and their families, sampling during the screening programme conducted at the Laboratory for Molecular Prenatal Diagnosis of Hemoglobinopathies at Villa Sofia-Cervello Hospital in Palermo, Italy.RESULTS:
This work allowed us to report three new nucleotide substitutions of the ß-globin gene a substitution of the nucleotide 16 in the CAP site area (HBB c.-35 A>G), a substitution of the nucleotide 478 in the second intron (HBB c.316-373) in association with ß-haemoglobin variant Hb G Copenhagen (HBBc.142G>A) and a substitution of the nucleotide 1656 within the 3' UTR (HBB c.*+182 G>A) in association with the 1393-bp deletion (NG_000007.3g.70060_71452del1393).CONCLUSION:
The present work emphasizes the importance of reporting the observed nucleotide changes to the Haemoglobin Variant Database, especially in the case of new or rare undefined mutations, to facilitate the determination of their phenotypic expression and the possible interactions with known molecular defects and to formulate an appropriate genetic counselling for couples at risk.Palavras-chave
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Base de dados:
MEDLINE
Assunto principal:
Hemoglobinas Anormais
/
Sequência de Bases
/
Deleção de Sequência
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Talassemia beta
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Polimorfismo de Nucleotídeo Único
/
Globinas beta
País/Região como assunto:
Europa
Idioma:
En
Ano de publicação:
2014
Tipo de documento:
Article
País de afiliação:
Itália