DNA sequence analysis and Jk blood group genotype-phenotype assessment

Area of Science:

• Genetics
• Hematology
• Molecular Biology

Background:

• The Kidd (JK) blood group system is crucial for safe blood transfusions.
• Current JK typing methods include serology and urea hemolysis, but molecular techniques are limited in scope.
• Population-scale molecular analysis of JK blood groups remains underexplored.

Purpose of the Study:

• To evaluate a Sanger sequencing method for JK genotyping.
• To assess the feasibility of population-scale JK molecular characterization.
• To identify reliable genetic markers for simplified JK typing.

Main Methods:

• Investigated 183 blood samples (174 Chinese Han donors, 9 Jk variant samples) using standard serology, urea hemolysis, and Sanger sequencing.
• Sequenced complete coverage of JK exons 4-11 and intron-exon borders.
• Analyzed single nucleotide polymorphisms (SNPs) and DNA variants.

Main Results:

• Reported frequencies of three SNPs in JK exon 4, exon 7, and intron 9.
• Identified simultaneous DNA variants in intron 7 (-68) and exon 9 (838) in all samples, indicating co-inheritance.
• Demonstrated the potential of sequencing for high-resolution JK genotyping.

Conclusions:

• The described sequencing method provides a robust technique for JK molecular characterization.
• Co-inherited variants in intron 7 (-68) and exon 9 (838) are reliable markers for JK typing.
• These two sites offer a simplified sequencing target for rapid JK typing, supplementing current serological and urea hemolysis tests.