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Molecular Cloning and Characterization of Decay-Accelerating Factor
Deficiency in Cromer Blood Group Inab Phenotype
Li Wang,
Makoto Uchikawa,
Hatsue Tsuneyama,
Katsushi Tokunaga,
Kenji Tadokoro, and
Takeo Juji
From the Japanese Red Cross Central Blood Center, Tokyo, Japan 150;
the Department of Biological Sciences, Graduate School of Science, The
University of Tokyo, Tokyo, Japan; and the Department of Human
Genetics, Graduate School of International Health, The University of
Tokyo, Tokyo, Japan.
An additional decay-accelerating factor (DAF) mutation, designated
as Inab phenotype in the Cromer blood group system, was recently
identified in a 28-year-old Japanese woman (H.A.). The red blood cells
of H.A., like those of other Inab phenotype individuals, were negative
for Cromer system antigens, Cra, Tca,
Dra, UMC, and IFC. The deficiency of DAF on the red blood
cells of H.A. has been shown by immunoblotting with a murine monoclonal antibody to DAF. Molecular analysis has shown that H.A. is homozygous for a single nucleotide substitution, C1579 A, at
the position 24 bp upstream of the 3 -end of exon 2 of the DAF
gene. This substitution causes the activation of a novel cryptic splice
site and results in the production of mRNA with a 26 bp deletion. The
deletion introduces a reading frame shift and creates a stop codon
immediately downstream of the deletion. Translation of mRNA would be
terminated at the first amino acid residue of the second short
consensus repeat (SCR2) domain (exon 3) of DAF. The functional domains
of DAF's complement regulatory activity and the carboxy-terminal
signal domains for glycosylphosphatidylinositol (GPI) anchoring are
predicted to be lacking in H.A. Thus, there would be no DAF present on
the cell surface.
Blood, Vol. 91 No. 2 (January 15), 1998:
pp. 680-684
© 1998 by The American Society of Hematology.

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