Step 7: Treatment Development

This step marks the beginning of our ultimate goal: the development of a treatment for chromosome 18 conditions!  Up to this point, we have…

1.  Learned all that has already been written about the condition (Literature Review)

2.  Fully investigated individuals with these conditions, both from a clinical and a molecular standpoint (Clinical and Molecular Assessments)

3.  Fully described the various medical and developmental concerns associated with the condition (Syndrome Description)

4.  Identified the genes directly responsible for the various features of the condition (Gene Identification)

5.  Created personalized management plans based on the genes involved (Syndrome Management Plan)

6.  Figured out how a change in the number of genes leads to the features of the condition. (Gene Function Studies)

We’ve come a long way from where we started, when precious little was known about each of these conditions.  At this point of the path, we will be able to predict which children are likely to have which complication, and we will be able to make up a plan specific to that person’s genetic situation.

Of course, there is still much work to be done.  We still want to develop a treatment that addresses the root cause of the issue: the deletion or duplication.  We are looking for a molecular “fix”, so to speak.

To do this, we must look for treatments that “make up” for the missing or extra pieces of chromosome.  In order to understand how we approach this challenge, it is important to have a basic understanding of genetic concepts.  Humans have two copies of each chromosome.  Genes are located on the chromosomes.  These genes code for proteins that play different roles throughout the body.  There are proteins that carry oxygen, proteins that help digest food; proteins that tell our body when to start producing certain hormones, and more!  Proteins play an important role in all of the body’s functions. 

So, what happens when there are missing or extra copies of a gene?  There may be too little or too much of the protein that the gene codes for.  This is likely the mechanism by which missing or extra copies of a gene lead to the various concerns associated with chromosome 18 conditions.  So, we want to find drugs that will either (1) increase the expression of a gene in a person with a deletion or (2) decrease the expression of a gene in a person with a duplication.

We start our search for a treatment in the laboratory.  We look at the effects of different drugs on gene expression.  At this point, we are just looking at the effects of the drug in vitro.  This means that we are looking at how the drug works outside of a living organism (for example, in test tubes or petri dishes).  When we find one that seems to affect gene expression, we have found a potential treatment!  It is then time to move on to our next step: Animal Models!