Regular expressions provide a very powerful way to describe patterns in text, making them an excellent resource for string validation and manipulation. The .NET Framework provides first-rate support for regular expressions in its System.Text.RegularExpressions namespace and specifically the Regex class found there.
Other mutations reduce but don't completely eliminate the activity of beta-hexosaminidase A and these genetic changes are responsible for the less severe forms of Tay-Sachs disease, which appear later in life as late onset TSD.ere are two locations for the HEXA gene. Cytogenetic Location: 15q23-q24 (The HEXA gene is located on the long (q) arm of chromosome 15 between positions 23 and 24. Each chromosome is divided into two sections called 'arms'.
Mutations in the Tay-Sachs Chromosome. Tay-Sachs disease is caused by mutations in the HEXA gene. More than 95 mutations that cause the disease have been identified.These mutations reduce or eliminate the activity of the enzyme beta-hexosaminidase A, preventing the normal breakdown of GM2 ganglioside in the brain and spinal cord.he Tay-Sachs chromosome is located on chromosome number 15, and is also known as the hexosaminidase A (or HEXA) gene.