The rare red cell phenotype Gerbich negative in Japanese

Area of Science:

• Immunology
• Genetics
• Hematology

Background:

• The Gerbich blood group system is a complex set of antigens on red blood cells.
• Gerbich-negative (Ge-) phenotypes are rare worldwide and have significant implications for blood transfusion compatibility.
• Previous reports of Ge-negative phenotypes are scarce, particularly in Asian populations.

Observation:

• Two unrelated Japanese individuals were identified with a Gerbich-negative (Ge-) blood type.
• These individuals represent the first documented cases of the Ge-negative phenotype in the Japanese population.
• Screening of donor serum identified these rare cases, highlighting the importance of comprehensive blood typing.

Findings:

• Both propositi exhibited the Gerbich type of Ge-negative phenotype (Ge: -1, -2, -3,).
• A notable depression of Kell system antigens was observed in both individuals.
• The sera of both propositi contained anti-Ge antibodies, indicating an immune response against Gerbich antigens.

Implications:

• The identification of these cases expands the known geographical distribution of the Gerbich-negative phenotype.
• The co-occurrence of Gerbich-negative phenotype with Kell antigen depression warrants further investigation into potential genetic linkages.
• These findings are crucial for establishing compatible blood transfusion protocols for individuals with rare blood types, especially within the Japanese population.