Abstract:
BACKGROUND AND OBJECTIVES:Antibodies to antigens in the Kell blood group system, especially anti-KEL1, are involved in both haemolytic disease of the newborn and foetus and haemolytic transfusion reactions. Correct typing results are important and discrepancies between serologic and genetic typing must be resolved. Here, we describe the investigation of three healthy individuals who were initially phenotyped as KEL:1,-2. MATERIALS AND METHODS:Antigen typing was performed by standard serological techniques and by flow cytometric analysis. The KEL*01/02 polymorphism was tested by an allele-discrimination TaqMan assay as well as by PCR with allele-specific primers and PCR-RFLP. DNA sequencing of the KEL coding region was also performed. RESULTS:Two KEL*02N alleles with mutated splice sites around exon 8 were identified: intron 7 -1g>c (novel) and intron 8 +1g>t (previously reported in one case of K(0)). In the third sample, a missense mutation in exon 8, 787G>A (novel) predicting Gly263Arg, was detected on a KEL*02 allele and associated with dramatically weakened KEL2 antigen expression. CONCLUSION:Resolution of discrepant phenotype/genotype results identified silencing mutations in or around exon 8. A combination of molecular and serologic methods has the potential to improve the quality of test results and was required to ensure both the accurate KEL2 antigen status and KEL*01 zygosity of these individuals.
journal_name
Vox Sangjournal_title
Vox sanguinisauthors
Wester ES,Steffensen R,Ligthart PC,Vad J,de Haas M,Storry JR,Olsson MLdoi
10.1111/j.1423-0410.2010.01334.xsubject
Has Abstractpub_date
2010-08-01 00:00:00pages
150-7issue
2eissn
0042-9007issn
1423-0410pii
VOX1334journal_volume
99pub_type
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