F8 intron 22 inversions and SNP rs73563631 in unrelated families with severe haemophilia A: clinical features and gene testing implications

F8 intron 22 inversions (INV22), the commonest cause of severe haemophilia A (HA), are mostly represented by type I (INV22-1) and type II (INV22-2) patterns (4:1) using BclI-fragments´ based techniques such as inverse shifting-PCR (IS-PCR/2008). Using IS-PCR/2008, we identified unusual patterns of t...

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Detalhes bibliográficos
Autores: Abelleyro, Miguel Martin, Rossetti, Liliana Carmen, Curto, Maria de Los Angeles, Radic, Claudia Pamela, Marchione, Vanina Daniela, de Brasi, Carlos Daniel
Formato: artículo
Estado:Versión publicada
Fecha de publicación:2015
País:Argentina
Recursos:Consejo Nacional de Investigaciones Científicas y Técnicas
Repositorio:CONICET Digital (CONICET)
Idioma:inglés
OAI Identifier:oai:ri.conicet.gov.ar:11336/42754
Acesso em linha:http://hdl.handle.net/11336/42754
Access Level:acceso abierto
Palavra-chave:Inv22
Ha
F8
Xq28
Hemophilia
https://purl.org/becyt/ford/3.1
https://purl.org/becyt/ford/3
Descrição
Resumo:F8 intron 22 inversions (INV22), the commonest cause of severe haemophilia A (HA), are mostly represented by type I (INV22-1) and type II (INV22-2) patterns (4:1) using BclI-fragments´ based techniques such as inverse shifting-PCR (IS-PCR/2008). Using IS-PCR/2008, we identified unusual patterns of the INV22-1 and INV22-2 (characterised by no signals in the diagnostic test and conventional INV22-1/-2 patterns in the complementary test) in patients and carriers from two (0.6%) out of 308 Argentinean families with severe-HA. A theoretical analysis of the 85 SNPs embedded in the relevant BclI-fragments followed by PCR-BclI-RFLP analysis allowed identification of the SNP rs73563631*G allele associated with a new BclI-restriction site in all four patients of Family 1 and 2. Linkage analysis using seven F8-linked-STRs in the two families confirmed two unrelated haplotypes in phase with INV22-1/-2. Screening of 404 X-chromosomes from the Argentinean general population failed to detected SNP rs73563631*G allele (q<0.24%). A new version of the IS-PCR/2008 adding the genotyping of the new patterns (x) of INV22-1/-2 was developed. Clinical/biochemical characteristics (severity and inhibitor risks) of patients with INV22-1x/-2x were virtually equal to canonical INV22s. Our estimations predict the involvement of INV22-1x/-2x in about 2.7% (4/149) of INV22-affected cases worldwide.

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