Latvian[edit] From an earlier abu, still dialectally attested (abi was originally the feminine/neuter dual form), from Proto-Baltic *abu, from Proto-Indo-European *a(m)-bÊ°ou, where the initial part is an old deictic pronoun or particle, reinforcing the meaning âtwo, bothâ of the second part.
Parkinson's disease is caused by the progressive impairment or deterioration of neurons (nerve cells) in an area of the brain known as the substantia nigra.When functioning normally, these neurons produce a vital brain chemical known as dopamine.arkinson's disease is caused by the progressive impairment or deterioration of neurons (nerve cells) in an area of the brain known as the substantia nigra.
1 Identified a variant in a gene (VPS35) that is the latest gene identified to cause Parkinson's disease. 2  Discovered mutations in a gene (DCTN1) that produce a very severe form of parkinsonism associated with breathing difficulties and severe depression.ogether, Mayo physicians and researchers have discovered a number of genes that cause parkinsonian disorders. For example, Mayo researchers: 1  Found the gene leucine-rich repeat kinase 2 (LRRK2) to be the most common genetic cause of late-onset, autosomal dominant Parkinson's disease.