When you think about what you'd want to inherit from your parents, you're probably thinking about money, property, or cool vintage jewelry - you're definitely not thinking about genetic diseases you can inherit. Unfortunately, there's a plethora of nasty genetic disorders that parents can pass down to their offspring. These illnesses are the result of inherited mutations on dominant or recessive genes. None of them are exactly fun, but this list focuses on the very worst genetic diseases to inherit.
The worst things to inherit from your family include the BRCA gene, which dramatically increases your risk of breast and other cancers, Tay-Sachs disease which causes neurological degeneration and death after only a few short years, alcoholism, and Lesch-Nyhan Syndrome, a disease where an inherited gene error leaves your body unable to process purines and causes uncontrolled movement, self-harm, and painful build ups of uric acid.
Even alcoholism makes the list of worst genetic abnormalities you can get, and there are more where that came from that may surprise you (and make you want to get your genes checked out).
BRCA Gene Mutations
The BRCA gene is an inherited mutation that dramatically increases one's likelihood of developing breast and ovarian cancer. For example, 72% of women who inherit a BRCA1 mutation and 69% of women who inherit a BRCA2 mutation will develop breast cancer before the age of 80, as opposed to the 12% risk in the general population. These mutations can also cause an increased risk of fallopian tube cancer, peritoneal cancer, acute myeloid leukemia, pancreatic cancer, and prostate cancer in men.
Because breast cancer is the most common result, some people who test positive for BRCA gene mutations, or who have a strong family history of breast cancer, may elect to get preventative mastectomies - the surgical removal of all breast tissue that could possibly become cancerous. It is still possible to get breast cancer after a mastectomy, but the chances decrease significantly. That said, breast cancer is not the only kind of cancer which the gene can cause, so mastectomy as prevention doesn't always work.
Cystic fibrosis is a life-threatening disorder that causes an abnormal layer of mucus to build up and coat bodily organs, especially the lungs and the pancreas. In the lungs, mucus restricts breathing and increases the risk of bacterial infections. In the pancreas, it blocks the release of digestive enzymes that help the body absorb food. Treatment has come a long way in recent years, but the median age of death is still only 40.
The disease is inherited when both parents are carriers of a defective gene — a phenomenon called autosomal recessive — and the gene is the cystic fibrosis transmembrane conductance regulator (CFTR). A deletion of three nucleotides basically mutates the gene and elimates crucial amino acids on the cell protein. There are actually more than 1,700 different mutations that can lead to cystic fibrosis, but tests only pick up on the most common ones - so it's actually possible to be tested for a mutation, be told you're not a carrier, and end up passing the disease along to your child anyway.
While the risk of heart disease can be somewhat mitigated by exercise and healthy eating, genetic factors can make heart disease impossible to avoid no matter how hard one might try.
For example, some inherited traits make it more likely that a person will accumulate fat deposits in their arteries, a problem which can lead to heart attack. Hypertrophic cardiomyopathy and arrhythmogenic right ventricular cardiomyopathy (ARVC) are both inherited conditions from sarcomere protein gene mutations that affect the heart's rhythm, making it beat irregularly and potentially leading to heart attack and even death. As such, people who have a close relative who is diagnosed with any sort of heart disease are encouraged to get a screening to find out if they also have the disease.
Because the birth defects caused by achondrogenesis are so severe, survival is just about impossible. There are three variations of the disease, each propagated by mutations in slightly different genes: TRIP11, SLC26A2, and COL2A1 (causing achondrogenesis type 1A, type 1B, and type 2, respectively). This condition, which is typically inherited from parents who are carrying a mutated gene, results in extremely short limbs and a very small torso. Most babies with this condition are stillborn or die shortly after birth due to respiratory failure.