The trouble, Medical College of Georgia researchers suspect, is that their high-density lipoprotein, or so-called good cholesterol, doesn’t protect many of them like it should and their new lifestyle makes that situation worse.
“Research shows that while only 9 percent of whites develop coronary artery disease, between 18 and 25 percent of South Asian immigrants eventually develop it,” says Dr. Sunita Dodani, MCG epidemiologist and cardiologist. “Interestingly, South Asians who live in their homelands have normal rates of the disease.”
In most South Asians, dysfunctional HDL, first identified by the historic Framingham Heart Study, is likely caused by a mutation of Apo-A1, the gene responsible for coding the major protein component of HDL, Dr. Dodani says.
“HDL can only protect people from heart disease if it’s functional,” she explains. “The dysfunctional HDL and external risk factors like stress from moving and new jobs and high-fat diets make for a deadly combination.”
Since joining MCG in October, Dr. Dodani, a South Asian immigrant herself, and collaborators at MCG and the University of California at Los Angeles have been studying 29 Augusta immigrants, looking for a connection between the gene mutation and dysfunctional HDL.
Blood samples were sent to UCLA to determine whether each subject had dysfunctional HDL. DNA sequencing helped researchers look for mutations of Apo-A1 and a portable carotid Doppler machine measured the thickness of carotid arteries, an indicator of impending coronary artery disease.
“Recent research has shown that thickening of the carotid arteries is directly related to thickening of the coronary arteries,” Dr. Dodani, the new assistant dean for research in the School of Nursing, says. “The Doppler machine is less invasive than angiography (which includes injecting a contrast medium into the patient) and can just as easily detect the disease in the early stages.”
Dr. Dodani and her colleagues suspected that if a subject had thickening of the carotid arteries, he or she would also have dysfunctional HDL and a polymorphism of the Apo-A1 gene. This is the first time researchers have examined a possible correlation between the gene polymorphisms, dysfunctional HDL and arterial thickness.
Interestingly, 40 percent of the study population had arterial thickness and, among that group, 17 percent had high blood pressure and more than 30 percent had high cholesterol. Half the study population also had dysfunctional HDL. DNA analysis of those blood samples also found six different mutations of Apo-A1.
“This is a strong indicator that these novel polymorphisms, which haven’t been found in any previous studies, are linked to dysfunctional HDL,” Dr. Dodani says. “These findings support our theory that the disease, in South Asians, is most likely caused by a combination of things – a dysfunctional HDL caused by a genetic polymorphism. Add the stresses of moving, high-stress jobs and high-fat diets, and that could explain the high rates in immigrants and not those who stay in their homelands.”
The next step, Dr. Dodani says, is expanding the study to include more people. She has applied for National Institutes of Health funding to do that over the next two years and eventually include other populations for comparison.
“Then we will be able to figure out what’s next,” she says. “If the cause is a combination of this gene mutation and other factors, are there preventive strategies that we can employ? Should cholesterol-lowering drugs be started earlier in certain populations? Those are questions we hope to eventually answer.”
Jennifer Hilliard | EurekAlert!
WAKE-UP provides new treatment option for stroke patients | International study led by UKE
17.05.2018 | Universitätsklinikum Hamburg-Eppendorf
First form of therapy for childhood dementia CLN2 developed
25.04.2018 | Universitätsklinikum Hamburg-Eppendorf
The more electronics steer, accelerate and brake cars, the more important it is to protect them against cyber-attacks. That is why 15 partners from industry and academia will work together over the next three years on new approaches to IT security in self-driving cars. The joint project goes by the name Security For Connected, Autonomous Cars (SecForCARs) and has funding of €7.2 million from the German Federal Ministry of Education and Research. Infineon is leading the project.
Vehicles already offer diverse communication interfaces and more and more automated functions, such as distance and lane-keeping assist systems. At the same...
A research team led by physicists at the Technical University of Munich (TUM) has developed molecular nanoswitches that can be toggled between two structurally different states using an applied voltage. They can serve as the basis for a pioneering class of devices that could replace silicon-based components with organic molecules.
The development of new electronic technologies drives the incessant reduction of functional component sizes. In the context of an international collaborative...
At the LASYS 2018, from June 5th to 7th, the Laser Zentrum Hannover e.V. (LZH) will be showcasing processes for the laser material processing of tomorrow in hall 4 at stand 4E75. With blown bomb shells the LZH will present first results of a research project on civil security.
At this year's LASYS, the LZH will exhibit light-based processes such as cutting, welding, ablation and structuring as well as additive manufacturing for...
There are videos on the internet that can make one marvel at technology. For example, a smartphone is casually bent around the arm or a thin-film display is rolled in all directions and with almost every diameter. From the user's point of view, this looks fantastic. From a professional point of view, however, the question arises: Is that already possible?
At Display Week 2018, scientists from the Fraunhofer Institute for Applied Polymer Research IAP will be demonstrating today’s technological possibilities and...
So-called quantum many-body scars allow quantum systems to stay out of equilibrium much longer, explaining experiment | Study published in Nature Physics
Recently, researchers from Harvard and MIT succeeded in trapping a record 53 atoms and individually controlling their quantum state, realizing what is called a...
25.05.2018 | Event News
02.05.2018 | Event News
13.04.2018 | Event News
25.05.2018 | Event News
25.05.2018 | Machine Engineering
25.05.2018 | Life Sciences