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Thomas W. Prior, Scott J. Bridgeman 

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Presentation on theme: "Thomas W. Prior, Scott J. Bridgeman "— Presentation transcript:

1 Experience and Strategy for the Molecular Testing of Duchenne Muscular Dystrophy 
Thomas W. Prior, Scott J. Bridgeman  The Journal of Molecular Diagnostics  Volume 7, Issue 3, Pages (August 2005) DOI: /S (10) Copyright © 2005 American Society for Investigative Pathology and Association for Molecular Pathology Terms and Conditions

2 Figure 1 Distribution of deletions in the dystrophin gene in DMD and BMD patients. Each bar represents a deletion observed in a patient. The number to the right of the deletion bar indicates the number of independent patients sharing deletions of the same exon. Analysis was performed by Southern blotting and multiplex PCR. Arrows indicate the cDNA probes used for Southern blotting. The Journal of Molecular Diagnostics 2005 7, DOI: ( /S (10) ) Copyright © 2005 American Society for Investigative Pathology and Association for Molecular Pathology Terms and Conditions

3 Figure 2 Distribution of duplications in the dystrophin gene in DMD and BMD patients. Each bar represents a duplication observed in a patient. The number right of the duplication bar indicates the number of independent patients sharing duplications of the same exon. Analysis was performed by Southern blotting. Arrows indicate the cDNA probes used for Southern blotting. The Journal of Molecular Diagnostics 2005 7, DOI: ( /S (10) ) Copyright © 2005 American Society for Investigative Pathology and Association for Molecular Pathology Terms and Conditions

4 Figure 3 Distribution of point mutations in the dystrophin gene in DMD and BMD patients. The numbers indicate the number of independent patients sharing a mutation in the same exon. Table 1 specifies the actual nucleotide changes. CM, cardiomyopathy splice point mutation. The Journal of Molecular Diagnostics 2005 7, DOI: ( /S (10) ) Copyright © 2005 American Society for Investigative Pathology and Association for Molecular Pathology Terms and Conditions

5 Figure 4 Southern hybridization using a dystrophin cDMD probe that hybridizes to exons 12 to 19 (DNA digested with HindIII). Lane 1 is an unaffected male control. The DMD patient in lane 2 has a gene deletion of exons 12 to 13. The DMD patient in lane 3 has a gene deletion of exons 13 to 17. The DMD patient in lane 4 has a gene duplication of exons 14 to 17. The DMD patient in lane 5 has a gene deletion of exons 12 to 19. The Journal of Molecular Diagnostics 2005 7, DOI: ( /S (10) ) Copyright © 2005 American Society for Investigative Pathology and Association for Molecular Pathology Terms and Conditions

6 Figure 5 Southern hybridization using a dystrophin cDMD probe that hybridizes to exons 20 to 28 (DNA digested with HindIII). The DMD patient in lane 2 is deleted for exons 22 to 28 and an exon 21 junction fragment has resulted (arrow). The Journal of Molecular Diagnostics 2005 7, DOI: ( /S (10) ) Copyright © 2005 American Society for Investigative Pathology and Association for Molecular Pathology Terms and Conditions

7 Figure 6 Multiplex DNA amplification of DNA from DMD patients. Lane 1, Unaffected male control. Lane 2, DMD patient deleted for exons 45 and 47. Lane 3, DMD patient deleted for exons 13 and 19. The Journal of Molecular Diagnostics 2005 7, DOI: ( /S (10) ) Copyright © 2005 American Society for Investigative Pathology and Association for Molecular Pathology Terms and Conditions

8 Figure 7 Carrier determination by gene dosage. The affected son (II-3) is deleted for exon 50. Exon 19 is the internal standard because the affected son is not deleted for this exon. The mother (I-1) and the daughter (II-1) show a 50% reduction of hybridization of exon 50:19 dosage ratio compared to the noncarrier female control (c), and are therefore carriers. Daughter (II-2) is a noncarrier because her exon 50:19 dosage ratio is equivalent to the female control (c). The samples were subjected to 14 PCR cycles and the PCR products were Southern blotted and hybridized with the corresponding cDNA probes 2b-3 and 8. The Journal of Molecular Diagnostics 2005 7, DOI: ( /S (10) ) Copyright © 2005 American Society for Investigative Pathology and Association for Molecular Pathology Terms and Conditions

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