Genetic diversity of KELnull and KELel: a nationwide Austrian survey.

Abstract:

BACKGROUND:Besides ABO and RH, the KEL blood group system, including the two antithetical antigens KEL1 and KEL2, is the most important owing to the frequent appearance of anti-KEL alloantibodies and their considerable clinical significance. So far, only limited information was available on KEL variant alleles determining the rare silent KELnull and KELel phenotypes with absent or diminished KEL antigen expression detected only by adsorption-elution techniques, respectively. STUDY DESIGN AND METHODS:For a systematic investigation of the KELnull and KELel phenotypes, 401 KEL:1,-2 samples (representing 2.6% of all Austrian KEL:1,-2 samples) and 811 KEL:1,2 samples were genotyped for the KEL*1/KEL*2-specific single-nucleotide polymorphism. All heterozygous KEL*1/KEL*2 and 4 additional KELnull samples were subjected to detailed immunohematologic examination and allele-specific sequencing. RESULTS:In 14 KEL:1,-2 samples, discrepant KEL*1/KEL*2 heterozygosity was observed, indicating the presence of silent or barely expressed KEL*2 alleles, whereas all KEL:1,2 individuals were homozygous for KEL*2. In the course of further molecular analysis, 8 novel KEL*2null and 2 KEL*2el alleles were discovered, representing 67 and 33 percent of previously known KEL*2null- and KEL*2el-encoding alleles, respectively. In addition, two different known KEL*2null and KEL*2el alleles each were confirmed. The immunohematologic properties of KEL variant red blood cells were defined by extended KEL phenotyping and flow cytometric KEL1, KEL2, KEL4, and KEL7 antigen as well as total Kell protein quantification. CONCLUSION:For the first time, exact KELnull and KELel population frequencies could be established in this population.

journal_name

Transfusion

journal_title

Transfusion

authors

Körmöczi GF,Wagner T,Jungbauer C,Vadon M,Ahrens N,Moll W,Mühlbacher A,Ozgül-Gülce S,Kleinrath T,Kilga-Nogler S,Schönitzer D,Gassner C

doi

10.1111/j.1537-2995.2007.01174.x

subject

Has Abstract

pub_date

2007-04-01 00:00:00

pages

703-14

issue

4

eissn

0041-1132

issn

1537-2995

pii

TRF01174

journal_volume

47

pub_type

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