A highly polymorphic region 3' to the human type II collagen gene

Area of Science:

• Genetics
• Molecular Biology
• Human Genomics

Background:

• The region downstream of the human Type II collagen gene contains tandem repeats.
• Previous studies identified two alleles differing by approximately 300bp.
• The exact polymorphic nature of this minisatellite region was not fully characterized.

Purpose of the Study:

• To characterize the polymorphism of a minisatellite region located 1.3kb downstream of the human Type II collagen gene.
• To determine the copy number and evolutionary origin of this minisatellite.
• To investigate the extent of genetic variation within this specific genomic region.

Main Methods:

• Cloning of the minisatellite region from genomic DNA of four unrelated individuals.
• DNA sequencing to identify and differentiate alleles.
• Bioinformatic analysis to assess copy number and evolutionary history.

Main Results:

• A highly AT-rich tandem repetitive region (minisatellite) of approximately 650bp was characterized.
• DNA sequence data from individuals with the larger previously identified allele revealed three distinct alleles, indicating higher polymorphism than expected.
• The minisatellite is present in a single copy in the human genome.
• Phylogenetic analysis suggests the minisatellite arose after the divergence of Old and New World monkeys.

Conclusions:

• The minisatellite region downstream of the human Type II collagen gene exhibits significant polymorphism.
• The observed genetic diversity suggests a complex evolutionary history for this repetitive element.
• This minisatellite serves as a valuable marker for human genetic variation studies and evolutionary research.