Alloalbuminemia in North India

Area of Science:

• Human Genetics
• Biochemistry
• Population Genetics

Background:

• Alloalbuminemia, characterized by the presence of abnormal human serum albumin variants, is a rare genetic condition.
• Understanding albumin variants aids in tracing human population migrations and evolutionary history.

Purpose of the Study:

• To screen a North Indian population for alloalbuminemia.
• To characterize identified albumin variants using molecular techniques.
• To investigate the population genetics and evolutionary implications of these variants.

Main Methods:

• Serum samples from 550 individuals from Punjab, North India, were screened using electrophoresis.
• Identified albumin variants were further analyzed by cyanogen bromide fragment electrophoresis to pinpoint molecular differences.
• Comparison of fragment patterns with known albumin variants.

Main Results:

• Four cases of alloalbuminemia were detected, with two slow and two fast-migrating albumin variants identified.
• One slow variant is similar to albumin B; a new variant, 'albumin Punjab,' showed alterations in cyanogen bromide fragments CNBr VI and CNBr I.
• One fast variant shared altered fragment CNBr V with albumin Naskapi; another new variant, 'albumin Patiala,' had an altered fragment CNBr VI.

Conclusions:

• The study identified novel albumin variants ('albumin Punjab,' 'albumin Patiala') in a North Indian population.
• The findings contribute to the catalog of human albumin polymorphism.
• The presence of albumin Naskapi in diverse populations suggests an ancient common ancestral origin predating major human migrations.