[Anti-M after transfusion as an indication of a genetic variant of the MN locus]
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H G Heuft1, V Weisbach, T Zeiler
1Abteilung Innere Medizin, Freie Universität Berlin, Universitätsklinikum Rudolf Virchow, BRD.
Abstract:
We report a case of an anti-M antibody (titer 128) and MN red blood cells (RBC) in a 76-year-old female German patient. In our case, however, RBC showed weak reactions to human anti-M compared with strong reactions using rabbit anti-M. Papain treatment destroyed the RBC reactivity to human anti-M whereas the strong reactivity to rabbit anti-M was unchanged. This pattern was also demonstrable in the patient's son and grandson. Our results indicate the existence of a rare allele at the MN locus in this family.
Insights
This study identifies a rare MNS blood group allele in a German family. The patient
Area of Science:
- Immunogenetics
- Hematology
- Molecular Biology
Background:
- The MNS blood group system is complex, with variations in the M and N antigens.
- Antibodies against M antigen can cause transfusion reactions.
- Understanding MNS locus variations is crucial for transfusion medicine.
Observation:
- A 76-year-old German female presented with an anti-M antibody (titer 128) and unusual MN red blood cells (RBC).
- Her RBCs reacted weakly with human anti-M but strongly with rabbit anti-M.
- Papain treatment abolished reactivity with human anti-M while preserving reactivity with rabbit anti-M.
Findings:
- The observed reactivity pattern suggests a rare allele at the MNS locus.
- This genetic variation was also present in the patient's son and grandson, indicating familial inheritance.
- The differential reactivity implies structural differences in the M antigen expression.
Implications:
- This finding highlights the importance of using specific reagents in blood group phenotyping.
- It may necessitate specialized antibody screening protocols for patients with this rare MNS allele.
- Further investigation into the molecular basis of this rare allele is warranted for improved transfusion safety.