Gene patents have not been a "problem" in the same way as software patents. And, unlike software patents, they are more likely to represent a significant R&D investment by the applicant.<p>(I am the author of the paper that showed how much of the human genome is patented. "Intellectual property landscape of the human genome", Science 2005. <a href="http://www.sciencemag.org/cgi/content/summary/310/5746/239" rel="nofollow">http://www.sciencemag.org/cgi/content/summary/310/5746/239</a> )<p>The brief filed by the government does not alter the law, it's just a letter to the court that says "this is the current, consensus opinion of the executive branch." The current law states that DNA (or any other naturally occurring chemical) cannot be patented unless it is significantly transformed from it's natural state. However, purification of the DNA is usually enough to render it patentable. That, of course, is not difficult with current molecular biology techniques.<p>But, like any other technology, patent applications covering DNA must meet many other requirements including non-obviousness and usefulness. Thus, the claims granted by the USPTO have become increasingly narrow as the field has matured and there is more prior art. That is, just like any new technology area the initially granted patents are broad, but they narrow over time.<p>So, that is a long way of saying, this might be a tempest in a teapot. Especially because most court watchers expect the Federal Circuit to reverse the District Court and keep the status quo.