The Lamin A gene is a dominant gene which is not X-linked, and almost always happen through an accidental mutation. With Progeria, it is not the gene that directly causes the disease, it is caused by a poorly or a non-functioning protein which is created by using the code, Prelamin A. Progeria is formed by an modification in LMNA which causes the gene to change, which then leads to a change in protein with a different function and form. Since Progeria is an autosomal disease, the mutation mostly always occurs after conception in the child. But there are rare cases where the parent does have the mutation in their sex-cells, which will lead to a very high chance that their child will have Progeria. Also if the child has the majority of the cells