How large can a mutation be? Genetic variations in the human genome can differ very much in size. Starting from the smallest mutations possible, the SNV (single nucleotide variation), up to the deletion of an entire chromosome, you can find mutations of every size in the middle! The vast majority of pathogenic mutations are SNVs
Current Methods for BRCA1/BRCA2 molecular analysis BRCA testing is commonly performed by direct Sanger sequencing. This method is considered the ‘gold standard’ of DNA sequencing. It is technologically reliable, widely available, and has a relatively simple workflow. The drawbacks of Sanger sequencing are: • limited throughput • lower cost-effectiveness compared to next-generation sequencing (NGS) •
Recommended testing at Breda Genetics for this condition (also to test for mosaicism): Tuberous sclerosis (TSC1, TSC2) If negative: MLPA analysis (TSC1, TSC2 gene). If negative: Exonic ultra-deep sequencing (600x) and SNaPshot analysis Summary Tuberous Sclerosis Complex (TSC), also called Bourneville syndrome, is a multisystem disorder with variable expressivity characterized by hamartomas in multiple organ