An update on the Knops blood group system

Area of Science:

• Immunology
• Genetics
• Hematology

Background:

• The Knops blood group system (ISBT system 22) comprises nine antigens.
• Previous understanding of the Knops system was detailed in a 2010 review.
• The clinical significance in transfusion medicine has been limited.

Purpose of the Study:

• To provide an update on the Knops blood group system.
• To identify the molecular basis of the York antigen (KN5/Yka).
• To highlight research interest in the Knops polymorphism.

Main Methods:

• Review of existing literature on the Knops blood group system.
• Genetic analysis to identify the molecular basis of specific antigens.
• Documentation of research trends and findings.

Main Results:

• No new antigens have been added to the Knops blood group system.
• The molecular basis of York, KN5, or Yka has been identified as c.4223C>T.
• This specific genetic variation is designated KN*01.-05.

Conclusions:

• The Knops blood group system remains at nine antigens.
• The identification of the molecular basis for KN*01.-05 provides a genetic marker.
• The Knops polymorphism holds significant interest for researchers studying malaria, as evidenced by numerous recent studies.