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Polymerase chain reaction method to identify Down syndrome model segmentally trisomic mice
Narayan Ramakrishna1, Clifford Meeker, Shuyun Li
1New York State Institute for Basic Research in Developmental Disabilities, 1050 Forest Hill Road, Staten Island, NY 10314, USA. ramakrishna_ny@yahoo.com
Analytical Biochemistry
|April 21, 2005
Summary
A new polymerase chain reaction (PCR) method accurately identifies Ts65Dn mice, a model for Down syndrome. This technique allows for precise and efficient genetic screening, aiding Down syndrome research.
Area of Science:
- Genetics
- Developmental Biology
- Animal Models
Background:
- The Ts65Dn mouse model carries a segment of mouse chromosome 16 homologous to the Down syndrome critical region on human chromosome 21.
- This model is crucial for investigating the developmental aspects of the Down syndrome phenotype.
Purpose of the Study:
- To develop a precise and efficient molecular method for identifying Ts65Dn mice.
- To provide an alternative to traditional karyotyping for genetic screening.
Main Methods:
- Development of a multiplex polymerase chain reaction (PCR) assay.
- Coamplification of chromosome 16 genes (App, Dyrk1a) with a chromosome 8 control gene (Acta1).
- Quantification of PCR products using agarose gel electrophoresis/photodensitometry and microcapillary electrophoresis.
Main Results:
- Established PCR conditions yielding product amounts proportional to template DNA.
- Achieved results within 10% of the expected 1.5 ratio using both quantification methods.
- Successfully maintained a Ts65Dn breeding colony over six generations using the developed method.
Conclusions:
- The developed PCR method offers a precise, efficient, and minimally invasive approach for identifying trisomic and disomic Ts65Dn animals.
- This technique facilitates the ongoing study of Down syndrome phenotypes in a relevant animal model.
- Enables accurate genetic screening crucial for maintaining research colonies.