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American Journal of Human Genetics logoLink to American Journal of Human Genetics
. 1992 Feb;50(2):434–437.

Factor IXMadrid 2: a deletion/insertion in factor IX gene which abolishes the sequence of the donor junction at the exon IV-intron d splice site.

J Solera 1, M Magallón 1, J Martin-Villar 1, A Coloma 1
PMCID: PMC1682439  PMID: 1346483

Abstract

DNA from a patient with severe hemophilia B was evaluated by RFLP analysis, producing results which suggested the existence of a partial deletion within the factor IX gene. The deletion was further localized and characterized by PCR amplification and sequencing. The altered allele has a 4,442-bp deletion which removes both the donor splice site located at the 5' end of intron d and the two last coding nucleotides located at the 3' end of exon IV in the normal factor IX gene; this fragment has been replaced by a 47-bp sequence from the normal factor IX gene, although this fragment has been inserted in inverted orientation. Two homologous sequences have been discovered at the ends of the deleted DNA fragment.

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Selected References

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