Study supports a causal role in narcolepsy for a common genetic variant

A new study conducted across Europe found an extraordinary association between narcolepsy and a specific gene variant related to the immune system.

The modified genome-wide association study involved 1,261 people with narcolepsy, representing nearly 90 percent of European patients suffering from narcolepsy with cataplexy who have complete diagnostic work-up and DNA available. They were matched with 1,422 controls. High-resolution genotyping identified genetic variants including those in the (HLA) system, which contains genes related to immune system function. Analysis was performed by logistic regression.

Results show that participants with the HLA allele DQB1*06:02 were 251 times more likely to have narcolepsy with cataplexy than participants without the . DQB1*06:02 had a remarkably high negative predictive value of 99.32 percent, which means that nearly 100 percent of narcolepsy with cataplexy patients are DQB1*06:02 positive. Four other DQB1 alleles provided protection against narcolepsy, strongly supporting a causal role for DQB1 in narcolepsy.

"For the first time we have tested the HLA association all over Europe," said principal investigator and lead author Mehdi Tafti, professor in the Center for Integrative Genomics at the University of Lausanne and Lausanne Hospital in Switzerland. "This almost 100 percent association with HLA is somehow unique to narcolepsy and suggests a causal implication."

Recent studies suggest that narcolepsy may be caused by an autoimmune response to an environmental trigger such as an infection. In people who are genetically susceptible to narcolepsy, the immune system may respond to the trigger by mistakenly attacking and destroying brain cells that make hypocretin, a hormone that helps promote alertness.

The authors noted that DQB1*06:02 is a common gene variant that is present in about 20 percent of the general European population. As a result, DQB1*06:02 had a low positive of only 65.68 percent. However, they suggested that high-resolution genotyping could play a valuable role in diagnosing patients suspected of having narcolepsy and evaluating at-risk populations.

"For clinicians these findings indicate they should reconsider the diagnosis of narcolepsy with cataplexy in HLA DQB1*06:02 negative patients," said American Academy of Sleep Medicine spokesperson Dr. Nathaniel Watson.

According to the American Academy of Sleep Medicine, narcolepsy is a rare but often disabling sleep illness characterized by excessive sleepiness. People with narcolepsy experience repeated daily episodes of an irrepressible need to sleep or lapses into sleep, which may occur as sudden, irresistible "attacks." Another common symptom of is cataplexy, which involves sudden muscle weakness caused by strong emotions such as laughter.

add to favorites email to friend print save as pdf

Related Stories

New insights into sleeping disorder narcolepsy

Dec 18, 2013

(HealthDay)—A new study has uncovered evidence that most cases of narcolepsy are caused by a misguided immune system attack—something that has been long suspected but unproven.

Researchers find new clue to cause of human narcolepsy

Jul 03, 2013

(Medical Xpress)—In 2000, researchers at the UCLA Center for Sleep Research published findings showing that people suffering from narcolepsy, a disorder characterized by uncontrollable periods of deep sleep, had 90 percent ...

Recommended for you

Leeches help save woman's ear after pit bull mauling

Apr 18, 2014

(HealthDay)—A pit bull attack in July 2013 left a 19-year-old woman with her left ear ripped from her head, leaving an open wound. After preserving the ear, the surgical team started with a reconnection ...

New pain relief targets discovered

Apr 17, 2014

Scientists have identified new pain relief targets that could be used to provide relief from chemotherapy-induced pain. BBSRC-funded researchers at King's College London made the discovery when researching ...

User comments