Tag Archives: genetic

October is Down Syndrome Awareness Month

Down Syndrome Awareness Month is chance to spread awareness, advocacy and inclusion throughout the community. During the month of October, we celebrate  individuals with Down syndrome and make people aware of their abilities and accomplishments

What Is Down Syndrome?
In every cell in the human body there is a nucleus, where genetic material is stored in genes.  Genes carry the codes responsible for all of our inherited traits and are grouped along rod-like structures called chromosomes.  Typically, the nucleus of each cell contains 23 pairs of chromosomes, half of which are inherited from each parent. Down syndrome occurs when an individual has a full or partial extra copy of chromosome 21.

This additional genetic material alters the course of development and causes the characteristics associated with Down syndrome. A few of the common physical traits of Down syndrome are low muscle tone, small stature, an upward slant to the eyes, and a single deep crease across the center of the palm – although each person with Down syndrome is a unique individual and may possess these characteristics to different degrees, or not at all.

How Common is Down Syndrome?
One in every 691 babies in the the United States is born with Down syndrome, making Down syndrome the most common genetic condition. Approximately 400,000 Americans have Down syndrome and about 6,000 babies with Down syndrome are born in the United States each year.

What Causes Down Syndrome?
Regardless of the type of Down syndrome a person may have, all people with Down syndrome have an extra, critical portion of chromosome 21 present in all or some of their cells.  This additional genetic material alters the course of development and causes the characteristics associated with Down syndrome.

The cause of nondisjunction is currently unknown, but research has shown that it increases in frequency as a woman ages.  However, due to higher birth rates in younger women, 80% of children with Down syndrome are born to women under 35 years of age.

There is no definitive scientific research that indicates that Down syndrome is caused by environmental factors or the parents’ activities before or during pregnancy.

The additional partial or full copy of the 21st chromosome which causes Down syndrome can originate from either the father or the mother. Approximately 5% of the cases have been traced to the father.

When Was Down Syndrome Discovered?
For centuries, people with Down syndrome have been alluded to in art, literature and science. It wasn’t until the late nineteenth century, however, that John Langdon Down, an English physician, published an accurate description of a person with Down syndrome. It was this scholarly work, published in 1866, that earned Down the recognition as the “father” of the syndrome. Although other people had previously recognized the characteristics of the syndrome, it was Down who described the condition as a distinct and separate entity.

In recent history, advances in medicine and science have enabled researchers to investigate the characteristics of people with Down syndrome. In 1959, the French physician Jérôme Lejeune identified Down syndrome as a chromosomal condition. Instead of the usual 46 chromosomes present in each cell, Lejeune observed 47 in the cells of individuals with Down syndrome. It was later determined that an extra partial or whole copy of chromosome 21 results in the characteristics associated with Down syndrome. In the year 2000, an international team of scientists successfully identified and catalogued each of the approximately 329 genes on chromosome 21. This accomplishment opened the door to great advances in Down syndrome research.

Asperger Syndrome

About AS:

  • It is a neurological disorder that affects the way information is processed in the brain.
  • AS is a hidden disability. Many people appear very competent, but they have difficulties in the areas of communication and social interaction.
  • AS has a genetic and hereditary component and may have additional or interactive environmental causes as yet unknown.
  • AS is a developmental disability. All individuals have social/emotional delays, but continued growth seems to be life-long.
  • The incidence of AS is thought to be 1 in 250. As many as 50% of people with AS may be undiagnosed.
  • There are currently four males diagnosed with AS for every one female, but the true ratio may be as high as one female for every two males.

AS affects each person differently, although there is a core set of features that most people with AS have, to different extents:

  • People with AS have normal to very high intelligence and have good verbal skills.
  • Challenges with the use and understanding of language in a social context.
  • Trouble understanding what someone else is thinking and feeling (called theory of mind or perspective taking).
  • Needing to be taught social behavior that is “picked up on” intuitively by others.
  • Difficulty understanding non-verbal cues such as hand movements, facial expressions, and tone of voice.
  • Challenges with organization, initiation, prioritizing, all called executive functioning tasks.
  • Focusing on small details rather than the bigger picture
  • Most people with AS have intense interest areas such as movies, geography, history, math, physics, cars, horses, dogs or reptiles. These interest areas change every 3 months to several years
  • Friendships are usually formed through mutual interest areas or activities.
  • Most people with AS view the world in black and white with difficulty compromising or seeing the gray areas.
  • Most individuals with AS describe themselves as feeling different, like aliens in our world.
  • Anxiety and/or depression are major components for many people with AS and may affect their ability to function.
  • Some individuals with AS have extreme and debilitating hyper- or hypo-sensitivity to light, noise, touch, taste, or smell. The environment can have a profound impact on their ability to function.

ALS

ALS

Huntington’s Disease

Huntington’s disease (HD) is an inherited brain disorder that results in the progressive loss of both mental faculties and physical control. Symptoms usually appear between the ages of 30 to 50, and worsen over a 10 to 25 year period. Ultimately, the weakened individual succumbs to pneumonia, heart failure or other complications.

Everyone has the HD gene but it is those individuals that inherit the expansion of the gene who will develop HD and perhaps pass it onto each of their children.

Presently, there is no cure. Although medications can relieve some symptoms, research has yet to find a means of slowing the deadly progression of HD.

Current estimates are that 1 in every 10,000 Americans has HD and more than 250,000 others are at-risk of having inherited it from a parent. Once thought a rare disease, HD is now considered one of the more common hereditary diseases.

Every person who inherits the expanded HD gene will eventually develop the disease.
Over time, HD affects the individual’s ability to reason, walk and speak

Symptoms Include:

  • Personality changes, mood swings and depression
  • Forgetfulness and impaired judgment
  • Unsteady gait and involuntary movements
  • Slurred speech and difficulty in swallowing

The Scope of HD
Approximately 30,000 Americans have HD, but the devastating effects of the disease touch many more. Within a family, multiple generations may have inherited the disease. Those at-risk may experience tremendous stress from the uncertainty and sense of responsibility. In the community, lack of knowledge about HD may keep friends and neighbors from offering social and emotional support to the family, fostering unnecessary isolation.

The Huntington’s Disease Society of America (HDSA) has a nationwide network that provides support and referrals for individuals with HD and their families.

Genetic Testing for HD
Individuals can be tested for the gene that causes HD. The test may be used to confirm a diagnosis of HD, but may also be used as a predictive test before symptoms arise. Some individuals at-risk for HD feel that it is important to know whether they carry the gene. Others ultimately choose not to be tested. While the actual procedure is simple, the decision to have the test is not. HDSA recommends that persons wishing to undergo presymptomatic testing for HD do so at one of our HDSA Centers of Excellence, or at a testing center with specific training in working with HD. A list of these testing centers is available from HDSA

HD affects both sexes and all races and ethnic groups around the world.
The Decision to test is highly personal and should never be rushed or forced.

Who is At-Risk?
Every child of a parent with HD has a  50/50 chance of inheriting the expanded gene that causes the disease. If the child has not inherited this expanded gene, he or she will never develop the disease and cannot pass it on to their children.

Genetic Information Nondiscrimination Act of 2008 (GINA)
The Genetic Information Nondiscrimination Act (GINA) protects people from discrimination by health insurers and employers on the basis of their DNA information. This federal law also enables individuals to take part in research studies without fear that their DNA information might be used against them by health insurers or in the workplace.

However, GINA protections do not extend to long term care, disability or life insurance policies. Anyone contemplating testing should first consider adding one or more of these types of policies before starting the testing process.

Advocacy
HDSA advocacy works to advance legislation and policy to improve the lives of HD families by raising awareness about HD in the U.S. Congress, by promoting legislation, policy and regulations that would help individuals in the HD community, by educating Federal agencies about HD, and by partnering and collaborating with national organizations that have common goals. Learn more at www.hdsa.org/advocacy.

Join us in the fight against HD
YOU can help HDSA in our efforts to end HD and provide resources for those who must face this disease daily. Both funds and volunteers are needed. Contact the HDSA National Office to find out how YOU can help.

HD does not skip generations; if one does not inherit the expanded gene, one cannot pass it on

An End To HD?
In 1993, researchers identified the gene that causes HD. Since then, research has moved quickly towards developing treatments and, ultimately, a cure. HDSA supports the goals of clinical and basic research at leading research facilities globally.

Clinical and observational trials are an important way you can help to sustain the momentum of HD research and move potential new therapies through the approval process. Visit the Research section of the HDSA website for more information and to find a trial in your area. There are opportunities for all HD family members – gene positive, at-risk, gene negative, and caregivers – to participate.

About HDSA
The Huntington’s Disease Society of America (HDSA) is the largest 501(C)(3) non-profit volunteer organization dedicated to improving the lives of everyone affected by Huntington’s disease. Founded in 1968 by Marjorie Guthrie, wife of folk legend Woody Guthrie who lost his battle with HD, the Society works tirelessly to provide family services, education, advocacy and research to provide help for today, hope for tomorrow to the more than 30,000 people diagnosed with HD and the 250,000 at-risk in the United States.

Where to find help
You are not alone in facing HD. HDSA has developed a nationwide network that includes Chapters and Affiliates, HDSA Centers of Excellence, Support Groups, and Social Workers that are ready to assist you with referrals and resources in your area. To learn more, please visit www.hdsa.org or call 888-HDSA-506.

Research worldwide is working to unlock the mystery of HD and find a cure

Neuromuscular Disorders

Neuromuscular disorders affect the nerves that control your voluntary muscles. Voluntary muscles are the ones you can control, like in your arms and legs. Your nerve cells, also called neurons, send the messages that control these muscles. When the neurons become unhealthy or die, communication between your nervous system and muscles breaks down. As a result, your muscles weaken and waste away. The weakness can lead to twitching, cramps, aches and pains, and joint and movement problems. Sometimes it also affects heart function and your ability to breathe.

Examples of neuromuscular disorders include

Many neuromuscular diseases are genetic, which means they run in families or there is a mutation in your genes. Sometimes, an immune system disorder can cause them. Most of them have no cure. The goal of treatment is to improve symptoms, increase mobility and lengthen life.