Blood groups, immunoglobulin allotypes and dermatoglyphic features of patients with amyotrophic lateral sclerosis and parkinsonism‐dementia of guam

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Abstract
Blood group frequencies, immunoglobulin allotypes, and dermatoglyphic patterns were determined on patients with amyotrophic lateral sclerosis (ALS) and parkinsonism‐dementia (PD), two chronic, degenerative, neurologic disorders of unknown cause found commonly among the Chamorros of the Mariana Islands, in an attempt to identify a specific genetic or phenetic marker associated with either disorder. With the exception of the Kidd system, no significant differences were found in blood group frequencies nor in immunoglobulin allotypes between ALS patients, PD patients, and unaffected controls. The dermatoglyphic analysis demonstrated that ALS patients had higher frequencies of palmar patterns and accessory triradii in the IV interdigital area, and PD patients had significantly higher frequencies of complete simian creases and of palmar patterns in the thenar/I interdigital area than unaffected controls. The frequencies of the remaining dermatoglyphic traits showed no significant differences. We conclude that none of the marker systems tested show a particular pattern of association in patients and controls or a genetic predisposition to either disorder, and that early identification of at‐risk individuals remains elusive.