New variants of Ps salivary polymorphic proteins

Area of Science:

• Genetics
• Biochemistry
• Population Studies

Background:

• The Ps protein's genetic polymorphism was previously described by Azen & Denniston (1980).
• Further investigation into the Ps protein's allelic variations is warranted to fully understand its genetic basis.

Purpose of the Study:

• To identify and characterize novel phenotypes of the Ps protein.
• To investigate the allelic structure underlying Ps protein polymorphism.
• To determine the gene frequencies of Ps protein alleles in a Japanese population.

Main Methods:

• Electrophoretic analysis was employed to examine Ps protein phenotypes.
• Family studies were conducted to assess the inheritance patterns of Ps protein alleles.
• Gene frequencies were calculated for identified alleles in the study population.

Main Results:

• Electrophoretic analysis revealed additional Ps protein phenotypes beyond those previously reported.
• Family studies supported a hypothesis involving six alleles (Ps1F, Ps1, Ps2F, Ps2S, Ps3, and Ps0) determining Ps protein polymorphism, with five being expressed and one unexpressed.
• The gene frequencies in the Japanese population were determined as Ps1F = 0.0016, Ps1 = 0.2983, Ps2F = 0.0288, Ps2S = 0.0079, Ps3 = 0.0111, and Ps0 = 0.6523.

Conclusions:

• The Ps protein exhibits a more complex polymorphism than previously understood, involving at least six alleles.
• The genetic model proposed, with five expressed and one unexpressed allele, adequately explains the observed Ps protein polymorphism.
• This study provides crucial data on Ps protein allele frequencies in a Japanese population, contributing to population genetics and human genetic variation studies.