What is direct-to-consumer genetic testing?

Several years ago, a small number of companies in the United States began selling DNA testing kits directly to consumers (referred to as DTC) via the internet. This market was made possible, in part, by the decreasing costs of genome analysis. These “consumer genetics” companies offered a broad array of tests that report on a person’s ancestry and health, as well as a number of other traits. Examples range from a person’s ability to taste bitter flavors or the photic sneeze reflex (uncontrollable sneezing when exposed to bright light) to risk for developing heart disease or diabetes. Initially, consumer genetics companies did not produce a full genome sequence, like the Human Genome Project, but rather, looked only at sites in the genome that commonly differ between individuals, known as single nucleotide polymorphisms (SNPs). However, with the ever-decreasing cost of genetic sequencing and analysis, as of 2016, a number of companies are beginning to offer full-genome sequencing services to consumers.

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The DTC debate

Whether people should be able to access their genetic information directly from a company is at the center of an on-going debate amongst doctors, patients, ethicists, politicians and regulatory bodies, such as the United States Food and Drug Administration (FDA). (This question is also the subject of pgEd’s lesson titled “Direct-to-consumer genetic testing.”) Some people with concerns about DTC testing think that people should only learn about their DNA from a doctor or genetic counselor to ensure that the results are clearly explained. Others argue that people should only learn about risks for disease that are “medically actionable,” i.e. when screening, therapeutics or a change in lifestyle may prevent or treat the disease. People who support DTC testing often find these views paternalistic and think that people have a right to learn about their own DNA if they choose, even if the information they learn is not medically actionable or if the interpretation might change over time.

Some of the original concerns about DTC genetic testing have subsided over the years, while others persist. It was originally thought that health insurers might use the results of a genetic test to deny coverage or raise premiums or that employers could fire people based on their genetic information (for more on this, see our page on what is genetic discrimination?). Some of these fears were allayed in 2008 when the United States Congress passed the Genetic Information Nondiscrimination Act (GINA), prohibiting these possibilities. Questions linger about the absence of protections for long-term care and life insurance as well as about the accuracy and usefulness of the tests. Still, many companies continue to report the growth of their customer base.

Regulating DTC testing?

It is an on-going question whether DTC genetic testing kits should be considered medical devices. As medical devices, they would be subject to the extensive rules and regulations that oversee safety, quality and marketing. In 2010, the FDA held hearings to explore the issue of regulation of genetic testing kits. Though reputable companies use laboratories that have been certified under CLIA (Clinical Laboratory Improvement Amendments), the FDA had concerns about the accuracy of information and counseling given to consumers. The FDA sent letters to a number of companies, and, as a result, some companies left the market or shifted their strategy to require a physician to order the test. In 2013, the FDA ordered 23andMe, one of the leading DTC genetic testing companies, to halt the sale of its product that returned health information to customers (in particular, information about the likelihood that a person will develop various diseases, based on the genetic markers in his or her genome, along with suggestions about how to reduce the risk). In 2015, the company received FDA approval for a number of genetic tests for “carrier status” – i.e., whether the individual inherited a copy of a genetic variant for a particular genetic condition (without actually having the condition), and so have a chance of passing the variant on to their offspring – and is once again selling such tests directly to consumers in the United States. Outside of the US (including in Canada and the United Kingdom), the company has been able to continue marketing genetic tests that return information about disease risk.

In late 2015, a number of consumer genetics companies began to offer the service of sequencing the entire human genome, and one such company has achieved the goal of sequencing and analyzing the genome for less than $1,000 USD. Some of these companies require consumers to order the service through their treating physicians; others allow consumers to order the service directly, with the request reviewed by physicians affiliated with the company. The FDA has sent letters to some of these latter companies, questioning the legitimacy of the patient-physician relationship in such cases and indicating that, in the agency’s view, the services fall into the category of medical devices being marketed DTC. Yet other companies are offering to simply return the genome sequences to consumers without providing any analysis or health information, while providing them with the opportunity to talk to company-affiliated genetic counselors about the data, or access to an “app store” of genetic analysis software (developed by the same company, other companies, or academic researchers) to perform their own analysis of the genome sequences. Whether, or how, these and similar consumer genetics products should be regulated remain in active area of discussion in 2016. As the regulatory landscape for selling genetic testing kits continues to evolve, the general argument remains that genetic information could encourage some people to opt for earlier or more frequent medical screenings or adopt lifestyle changes to avoid a specific disease.

 

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