C282Y/H63D hemochromatosis mutations and microevolution: Speculations concerning the Basque population

Area of Science:

• Human genetics
• Population genetics
• Anthropology

Background:

• The Basque population resides in the Western Pyrenees, recognized as one of Europe's most ancient groups.
• Previous research indicates distinct genetic polymorphism frequencies within this relatively isolated population.
• Hereditary hemochromatosis is a condition linked to specific mutations in the HFE gene.

Purpose of the Study:

• To investigate the unusual distribution of two primary HFE gene mutations (C282Y and H63D) in the Basque population.
• To explore potential evolutionary factors contributing to these observed genetic patterns.

Main Methods:

• Analysis of genetic polymorphism frequencies, specifically HFE mutations C282Y and H63D.
• Review of historical, environmental, and demographic data relevant to the Basque population.
• Comparative analysis with other European populations, including Celts and Vikings.

Main Results:

• The Basque population exhibits a low frequency of the C282Y HFE mutation.
• Conversely, the H63D HFE mutation shows one of the highest frequencies in Europe among Basques.
• These patterns differ significantly from neighboring populations like Celts and Vikings.

Conclusions:

• Genetic drift, influenced by the population's long history and small size, likely plays a role.
• Persistent consumption of iron-rich Paleolithic diets may have contributed to selective pressures.
• Limited admixture with other European groups, such as Celts and Vikings, who have higher C282Y prevalence, is a significant factor.
• Historical and environmental contexts are crucial for understanding the genetic makeup of human populations.