Summary
A case of homozygous factor X deficiency arising from the inheritance of two non-identical gene deletions from heterozygous parents is described. One, a partial gene deletion, was localized to exons VII and VIII by a combination of Southern blotting and polymerase chain reaction (PCR) amplification of exon sequences. The other deletion, of maternal origin, probably involves the entire factor X gene. Restriction fragments associated with the exon VII + VIII deletion were present in three siblings including the homozygous proband. These fragments were however absent from the somatic cells of the father, a finding consistent with germline mosaicism.
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Wieland, K., Millar, D.S., Grundy, C.B. et al. Molecular genetic analysis of factor X deficiency: gene deletion and germline mosaicism. Hum Genet 86, 273–278 (1991). https://doi.org/10.1007/BF00202408
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DOI: https://doi.org/10.1007/BF00202408