NCAM: a polymorphic microsatellite locus conserved across eutherian mammal species

Area of Science:

• Genomics
• Molecular Biology
• Mammalian Genetics

Background:

• The neural cell adhesion molecule (NCAM) gene plays a crucial role in cellular processes.
• Microsatellites are repetitive DNA sequences known for their variability.
• Conserved genetic elements across species are valuable for comparative studies.

Purpose of the Study:

• To investigate the conservation of a dinucleotide microsatellite at the 3' untranslated region of the NCAM gene across mammalian species.
• To assess the utility of this microsatellite as a conserved genetic marker for interspecies analysis.
• To identify variations in length and structure of the microsatellite across different mammalian orders.

Main Methods:

• DNA sequencing of the 3' untranslated end of the NCAM gene.
• Polymerase Chain Reaction (PCR) using conserved primers.
• Sequence analysis to identify microsatellite repeat length and structure.
• Comparative genomics across selected mammalian species.

Main Results:

• A dinucleotide microsatellite is conserved at the 3' end of the NCAM gene in cattle, rat, and human.
• The microsatellite is conserved across all studied eutherian mammal species.
• Variations in microsatellite length and internal structure due to base substitutions were observed.
• Polymorphisms were detected in rat, buffalo, sheep, cow, whale, and dolphin, with predictions for pig and dugong.

Conclusions:

• The identified dinucleotide microsatellite in the NCAM gene is a highly conserved marker across eutherian mammals.
• The observed polymorphisms offer potential for population genetics and evolutionary studies in mammals.
• A single set of PCR primers can amplify this conserved region across multiple species, facilitating broader research.