Microarray to detect mutations in largest Human Gene
Posted Sep 29 2008 7:40pm
The average human gene consists of 3000 bases, but sizes vary greatly, with the largest known human gene being dystrophin at 2.4 million bases. Residing at Chromosome 4 it has long been of interest to the medical community because its the gene responsible for huntington’s disease, polycystic kidney disease, a form of muscular dystrophy and a variety of other inherited disorders. Chromosome 2 is noteworthy for being the second largest human chromosome, trailing only chromosome 1 in size. It is also home to the gene with the longest known, protein-coding sequence - a 280,000 base pair gene that codes for a muscle protein, called titin, which is 33,000 amino acids long.
Now reseacrhers at Emory university has developed a microarray based test to chek for mutations in this gene. The current test do not detect all types of mutation that affects 1 in 3500 males according to the university wesbite.
Mutations in the dystrophin such as point mutations in a sequence of DNA can result in mistakes in gene expression and nonfunctional proteins that causes Duchenne muscular dystrophy (DMD).
A detailed presentation of the advantages of the test is available at the Emory Genetics Testing website. The test offeredon the Nimblegen CGH array platform gains more prominance as the company is now being acquired by Roche who has plans to dominate the clinical microarray market with its products in genetics testing space
The emory university Genetics testing lab offers numerous other genetic tests