Blood group factor B is more frequent in patients with psychotic affective disorders. Nonpsychotic patients showed an increased frequency of the Kell K(+) phenotype, while the unclassifiable group had less SS phenotype.
Area of Science:
Psychiatry
Genetics
Immunology
Background:
Affective disorders encompass a range of mood disturbances.
Blood group antigens are genetically determined and have been investigated for associations with various diseases.
Previous studies suggested links between specific blood types and bipolar disorder, but findings were inconsistent.
Purpose of the Study:
To investigate the frequencies of various blood group systems (ABO, Rh, MNSs, P, Kell, Lewis, Duffy) in patients diagnosed with affective disorders.
To determine if specific blood group phenotypes are associated with different subtypes of affective disorders, including bipolar psychosis, unipolar depression, and reactive depression.
Main Methods:
A cohort of 219 patients with affective disorders was analyzed.
Patients were categorized into four groups: bipolar psychosis, unipolar recurrent depressive psychosis, nonpsychotic reactive depression, and unclassifiable affective disorder.
Frequencies of ABO, Rh, MNSs, P, Kell, Lewis, and Duffy blood groups were statistically compared across these patient groups.
Main Results:
An increased frequency of blood group factor B was observed in psychotic patients (bipolar and unipolar) compared to nonpsychotic patients.
A decreased frequency of the SS phenotype (MNSs system) was found in the unclassifiable affective disorder group.
An increased frequency of the Kell K(+) phenotype was noted among nonpsychotic patients.
Conclusions:
Blood group factor B may be associated with the pathophysiology of psychotic affective disorders.
The Kell K(+) phenotype might be a protective factor or associated with nonpsychotic depression.
The study did not confirm previous findings regarding associations between ABO blood types (A and O) and differences between bipolar and unipolar patients.