Clinical diagnosis of neurofibromatosis type I in multiple family members due to cosegregation of a unique balanced translocation with disruption of the NF1 locus: Testing considerations for accurate diagnosis.

Neurofibromatosis type 1 (NF1) is an autosomal dominant disorder that causes a predisposition to develop tumors along the peripheral nervous system. The NF1 gene, located at 17q11.2, has the highest mutation rate among known human genes and about half of NF1 patients have de novo pathogenic variants.