1 DNA and proteins are key molecules of the cell nucleus. 2  One gene makes one protein. 3  A gene is made of DNA. 4  Bacteria and viruses have DNA too. 5  The DNA molecule is shaped like a twisted ladder. 6  A half DNA ladder is a template for copying the whole.  RNA is an intermediary between DNA and protein.
1 Another theory holds that depression may directly damage the brain, leading to dementia. âSimply put, chronic stress and/or depression may result in the release of cortisol,â Gorman says. Over time, this stress hormone can harm the brain, she says.  A third theory points to reduced brain volume.
Treating Depression Before Dementia. âOne important implication of our study is that people with symptoms of depression should pursue treatment even if their symptoms arenât disabling,â Wilson says. Symptoms of depression can include problems with memory, concentration, and decision making. Treatment for depression may include medications or behavioral therapy. The goal, Dr. Schulz says, is to shorten the depression in hopes of reducing the risk for dementia.