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Genotyping Single Nucleotide Polymorphisms in the Mitochondrial Genome by Pyrosequencing

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Mitochondrial insertion-deletion polymorphism: role in disease pathology.

Sreelatha Komandur¹, Sambasivan Venkatasubramanian, Ravindra Varma Alluri

¹Department of Genetics and Molecular Medicine, Kamineni Hospitals, L.B Nagar, Hyderabad, India.

Genetic Testing and Molecular Biomarkers

|April 12, 2011

Summary

Mitochondrial DNA (mtDNA) 9-bp repeat polymorphisms are linked to human diseases. This study reveals that variations in these repeats, specifically insertions or deletions, are associated with conditions like cardiomyopathy and neurological disorders.

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Area of Science:

Genetics
Molecular Biology
Human Disease Pathogenesis

Background:

Mitochondrial DNA (mtDNA) sequence variations are implicated in various human diseases.
A specific 9-bp repeat sequence (CCCCCTCTA) in the mtDNA intergenic region is crucial for phylogenetic studies.
Previous reports noted polymorphism in Southeast Asians, but its disease association was unclear.

Purpose of the Study:

To systematically investigate the role of insertion-deletion (indel) polymorphism in the 9-bp repeat of mitochondrial DNA in human disease.
To determine if variations in this mtDNA repeat sequence are associated with specific neurological and cardiac disorders.

Main Methods:

Screening of 241 patients diagnosed with cardiomyopathy, ataxias, and idiopathic neurological disorders.
Comparison of mtDNA 9-bp repeat sequences between patient cohorts and 100 healthy controls.
Genotyping of the 9-bp repeat to identify single (deletion) or triple (insertion) repeat variations.

Main Results:

A significant difference in repeat copy number was observed between patients and controls.
2.9% of patients exhibited a single repeat (deletion), and 4.14% had three repeats (insertion).
All control individuals possessed the normal two repeats of the sequence.

Conclusions:

The 9-bp insertion-deletion repeat polymorphism in mtDNA is implicated in disease pathology.
These polymorphisms may affect the expression of downstream mitochondrial genes.
Altered ATP generation due to these variations likely contributes to disease development.