Perinatal. Referring to the period of time surrounding an infant's birth, from the last two months of pregnancy to the first 28 days of life. The TORCH panel tests for perinatal infections.
1 CMT1 is commonly caused by a duplication of a gene on chromosome 17. This gene controls the production of your nervesâ protective myelin sheath. CMT1 is also caused by other gene defects.  CMT2 results from a defect in your peripheral nerve cellsâ axon. This is caused by a defect in your mitofusin 2 gene.
In approximately 10% of the cases there is a family history of the disorder. Tourette syndrome appears to represent a communication problem within the brain, primarily involving the brain chemicals serotonin and dopamine. The exact genetic cause of Tourette syndrome is unknown.n approximately 10% of the cases there is a family history of the disorder. Tourette syndrome appears to represent a communication problem within the brain, primarily involving the brain chemicals serotonin and dopamine. The exact genetic cause of Tourette syndrome is unknown.