This Merchant & Gould whitepaper summarizes the holding of the recent Supreme Court Association of Molecular Pathology v. Myriad Genetics decision, outlines its impact, and provides practice tips to those endeavoring to protect nucleic acids, genes, cDNAs, and other biological molecules, including proteins and antibodies as well as diagnostic methods that relate to laws and products of nature.

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Association for Molecular Pathology v. Myriad Genetics, Inc.:
Isolated, Naturally Occurring DNAs are Patent Ineligible Products of Nature
On June 13, 2013, the Supreme Court of the United States unanimously held that
isolated, naturally occurring DNAs are not patent eligible, but synthetically produced cDNAs
are.1
35 U.S.C. § 101 provides that processes, machines, manufactures, and compositions of
matter are patent eligible subject matter. Judicially created exceptions, however, put limits on
patent eligibility where patent claims encompass laws of nature, natural phenomena, and abstract
ideas. The Court granted certiorari to consider the sole question of whether human genes are
patent eligible under 35 U.S.C § 101.2
A. The Facts of Association for Molecular Pathology v. Myriad Genetics, Inc.
This case concerns clinically significant diagnostic methods for detecting genetic
mutations in BRCA1 and BRCA2, which are predictive of an increased risk for developing
breast and/or ovarian cancer. Many patients testing positive for such mutations elect surgical
removal of their breasts and/or ovaries.
Myriad owns a family of patents that includes claims to isolated DNAs and cDNAs that
encode a BRCA1 or a BRCA2 polypeptide sequence. Medical organizations, doctors, advocacy
groups, and patients (collectively, “Petitioners”) filed a declaratory judgment action asserting the
invalidity of Myriad’s patents because they claim natural products. By seeking to invalidate
Myriad’s patents, Petitioners hoped to remove them as a barrier to the development of other
commercially available laboratory test sites thereby increasing the accessibility and decreasing
the price of the test services.
B. The Supreme Court’s Decision
The Court affirmed in part and reversed in part the prior Federal Circuit decision by
holding that claims directed to isolated naturally occurring DNAs are not patent eligible because
1
Ass'n for Molecular Pathology v. Myriad Genetics, Inc., No. 12-398, 2013 U.S. LEXIS 4540, at *6 (U.S.
June 13, 2013).
2
Ass'n for Molecular Pathology v. Myriad Genetics, Inc., 133 S. Ct. 694 (2012).

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such DNAs fall within the naturally occurring phenomena exception.3
But the Court upheld the
Federal Circuit decision that claims to cDNAs are patentable eligible.4
The judgment
acknowledges that the common law exceptions to patent eligibility strike a balance between
incentives for innovation and impediments to the public availability of information, especially as
it relates to the basic tools of science and technology.
The Court characterized Myriad’s contribution as “uncovering the precise location and
genetic sequence of the BRCA1 and BRCA2 genes within chromosomes 17 and 13.”5
Referring
to Chakrabarty, the Court articulated that the test for patentable subject matter is whether the
subject matter of the claim “was new with markedly different characteristics than that found in
nature.”6
Applying this test, the Court found that a claim to isolated DNA encoding a specific
polypeptide is not different than the DNA found in nature; Myriad did not create or alter any of
the DNA or any of the genetic information encoded in the BRCA1 and BRCA2 genes. Although
acknowledging that Myriad expended huge research efforts in establishing the role played by the
BRCA1 and BRCA2 genes in various forms of cancer, the Court, nonetheless, found that
separating the DNA from its surrounding genetic material is not an invention. The Court
recognized that Myriad’s discovery was beneficial and important but maintained that
“[g]roundbreaking, innovative, or even brilliant discovery does not by itself satisfy the § 101
inquiry.”7
Myriad argued that the isolated DNA from its natural state breaks chemical bonds and
changes natural DNA into a non-naturally occurring molecule. The Court was not persuaded. It
reasoned that Myriad neither claimed the subject matter in terms of a chemical composition nor
relied on the modified DNA. The Court speculated that this was because it would be easier for a
competitor to design around the claims through insubstantial modification of the claimed
sequence. Recognizing that such a design around would be unacceptable to Myriad, the Court,
3
Ass'n for Molecular Pathology, 2013 U.S. LEXIS at *6, *22.
4
Id. at 30.
5
Id. at 22.
6
Id. at 23.
7
Id.

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nevertheless, concluded that the claims center around genetic information expressed in the
BRCA1 and BRCA2 genes and “not with a specific chemical composition of a molecule.”
The Court took a different view of cDNA patent eligibility because, in its view, cDNAs
do not occur in nature. The Petitioners countered by arguing that “[t]he nucleotide sequence of
cDNA is dictated by nature, not by the lab technician,” thereby making cDNA patent
ineligible.”8
The Court rejected this argument, concluding that cDNA was not a product of
nature because it was new and distinct from the parent DNA even though it retains naturally
occurring exons of the parent DNA. Accordingly, the Court held that cDNA is patent eligible
under § 101. Finally, the Court noted the limits of its decision because the case did not present
any issues related to method claims directed to manipulating genes or method of use claims; nor
was the Court presented with issues involving patents on altering natural DNA sequence.
C. Implications of the Supreme Court’s Decision
The impact of the Supreme Court’s decision is best considered in view of holdings in the
Court’s Mayo v. Prometheus9
and the Federal Circuit’s Ass’n Mol. Path. v. U.S.P.T.O.10
decisions, which, collectively, limit the patent eligibility of diagnostic methods and gene
sequences, where claims broadly encompass natural phenomena and products of nature.
A quick search of patents issued by the U.S.P.T.O. identified greater than 5,000 patents
that claim “isolated DNA.” While the Court acknowledged Circuit Judge Moore’s observation11
that patentees rely on prior court decisions12
and U.S.P.T.O. guidelines13
when drafting claims to
“isolated DNA,” it was, nonetheless, not influenced by that fact.
8
Id. at 30.
9
Mayo Collaborative Services v. Prometheus Laboratories, Inc., 566 U.S. ___ (2012).
10
Ass’n for Molecular Pathology v. U.S.P.T.O., 689 F.3d 1303 (Fed. Cir. 2012).
11
Id. at 1343 (Circuit Judge Moore, concurring in part, “Congress has, for centuries, authorized an
expansive scope of patentable subject matter. Likewise, the United States Patent Office has allowed
patents on isolated DNA sequences for decades, and, more generally, has allowed patents on purified
natural products for centuries. There are now thousands of patents with claims to isolated DNA, and
some unknown (but certainly large) number of patents to purified natural products or fragments thereof.
… I believe we must be particularly wary of expanding the judicial exception to patentable subject matter
where both settled expectations and extensive property rights are involved.
12
See, e.g., Amgen v. Chugai, 927 F,2d 1200 (Fed. Cir. 1991) (upholding the validity of claims directed
to “[a] purified and isolated DNA sequence consisting essentially of a DNA sequence encoding human

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Clearly, these decisions will have a widespread impact on the biotechnology industry,
especially those companies employing genomics technologies to develop predictive
methodologies for the safety and efficacy of therapeutic compounds. Moreover, these decisions
leave uncertain whether other biomolecules, such as proteins and antibodies that share structural
identity with in vivo molecules, are, like genes, also patent ineligible. It would be prudent,
therefore, to expect that claims covering any biomolecule as it appears in nature, regardless of
whether it was isolated, are likely invalid as directed to ineligible subject matter.14
Viewed collectively, however, the court decisions do provide substantial clarity about
what subject matter is and is not patent eligible. These decisions should be carefully considered
when preparing patent specifications and drafting claims that recite nucleic acids, including
cDNAs, genomic DNAs, synthetically produced DNAs having non-natural nucleotide sequences,
methods for detecting and using nucleic acids, and new applications of knowledge regarding
genetic information. And they are equally relevant, albeit less illuminating, when considering
strategies for protecting other biomolecules such as antibodies and other proteins.
D. Practice Tips
With these decisions and their implications in mind, we offer the following
recommendations for drafting specifications and claims to new biotechnology inventions and for
amending claims in issued patents and pending patent applications.
erythropoietin”) and In re Kubin, 561 F.3d 1351 (Fed. Cir. 2009) (“[t]he isolation and sequencing of a
human gene that encodes a particular domain of a protein” is “a classic biotechnology invention.”).
13
See, e.g., and U.S.P.T.O. Utility Examination Guidelines, 66 Fed. Reg. 1092 (2001) (“A patent on a
gene covers the isolated and purified gene but does not cover the gene as it occurs in nature. Thus, the
concern that a person whose body ‘includes’ a patented gene could infringe the patent is misfounded.”)
14
Id. at 27-28. “Myriad’s claims are simply not expressed in terms of chemical composition, nor do they
rely in any way on the chemical changes that result from the isolation of a particular section of DNA.”
The Court implies that if claims are directed to a chemical structure and a change in chemical structure
from the compound as it exists in nature is relied upon, then those claims might cover eligible subject
matter. The question remains what is meant by “reliance on chemical changes?” While this statement
may be beneficial to certain biomolecules that depend heavily upon their chemical structure, this strategy
is limited when applied to DNA sequences in view of the Court’s following statement: “If the patent
depended upon the creation of a unique molecule, then a would-be infringer could arguably avoid at least
Myriad’s patent claims on entire genes (such as claims 1 and 2 of the ‘282 patent) by isolating a DNA
sequence that included both the BRCA1 or BRCA2 gene and one additional nucleotide pair.”

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Issued Patents
Portfolios of issued patents should be reviewed for claims that cover laws of nature,
natural phenomena, or products of nature. Where such claims are identified, patentee should
consider pursuing a reissue application with claims amended to escape the exceptions to patent
eligibility. Because such claim amendments are typically narrowing amendments, patentee has
until the patent expires to file a reissue and is not limited to the two year period in which a
broadening reissue must be filed.
When reviewing issued claims, consider claims that recite nucleic acids and ensure that
those claims do not “read on” genetic DNA. Beware of claims using open-ended comprising
language to broaden the scope of protection for short polynucleotides and other gene fragments,
including primer and probe sequences. Where supported by the specification, incorporate size
limitations and other clarifying amendments to ensure that the claim does not cover a genetic
sequence.
Review claims that are directed to methods for detection and amend those claims to recite
assay components and methodologies for performing steps of detecting, measuring, observing,
and the like. If the specification disclosure supports assays and systems for using genetic
information in methods for detection, draft claims that specifically recite the components of
those assays and systems. A claim to a method for detecting a genetic mutation by comparing
one sequence to another is likely not patent eligible, but a claim that recites the steps of
amplifying and sequencing a genetic sequence likely is.
Pending Patent Applications
Pending patent applications should also be reviewed for claims directed to patent
ineligible subject matter. Amend those claims as suggested, above, for issued patents. Also
consider alternative claim strategies to broaden the overall scope and range of patent protection
including, for example, pursuing claims in a continuing application that are directed to primer
and probe sequences that are used in methods for detecting claims and limit the size of those
sequences to ensure that the claims do not inadvertently read on a gene sequence.
Also consider claims to vectors and plasmids that comprise and direct the expression of
gene and cDNA sequences and host cells comprising those vectors and plasmids. If a

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composition or method claim recites a gene sequence containing one or more naturally-occurring
mutations that are associated with a particular disease or phenotype, consider amending those
claims, or pursuing separate claims, to recite cDNA sequences that contain those mutations.
And, if those newly drafted claims are not adequately supported by the specification as
originally filed, consider incorporating new subject matter into the specification of a pending
application and filing as a continuation-in-part or a separate stand-alone application.
Newly Drafted Patent Applications
When preparing new patent applications, draft specifications that clearly describe
structural and functional distinctions between the claimed subject matter that might otherwise be
regarded as a natural phenomenon or a law or product of nature. Describe how newly disclosed
biomolecules differ from naturally occurring biomolecules and disclose splice variants of
naturally occurring DNAs. In addition to claims to the cDNAs themselves, also disclose and
claim vectors for expression of cDNAs and host cells comprising those expression vectors.
In the specification, set out definitions for terms such as “synthetic,” “percent identity,”
“complementary,” “conservative substitution,” and “recombinant,” which can be used in claims
to distinguish the subject matter over natural products. When drafting new claims, avoid certain
terms, such as “discovered,” “found,” “identified,” “located,” “isolated,” and “purified,” which
were specifically called out as potentially problematic by the Court when discussing Myriad’s
patent.15
Instead, claims should reference cDNA sequences and use terms, such as “created,”
“synthetic,” and “derived,” which were adopted by the Court when discussing why a cDNA is
patent eligible.16
Further, a DNA sequence, if derived from a genomic sequence, must have at
least one intervening intron removed.17
15
“Nor are Myriad’s claims saved by the fact that isolating DNA from the human genome severs
chemical bonds and thereby creates a nonnaturally occurring molecule.” Id. at 27.
16
“That may be so, but the lab technician unquestionably creates something new when cDNA is made,
but it is distinct from the DNA from it was derived. As a result cDNA is not a ‘product of nature’ and is
patent eligible under §101 . . . .” Id. at 30.
17
“As a result cDNA is not a ‘product of nature’ and is patent eligible under §101, except insofar as very
short series of DNA may have not intervening introns to review when creating cDNA. In that situation, a
short strand of cDNA may be indistinguishable from natural DNA.” Id. at 17. “As already explained,
creation of cDNA sequence from mRNA result in an exons-only molecule that is not naturally occurring.
Id. at 30.

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In addition to composition claims, also remember to disclose and claim commercial
embodiments of those compositions and to claim methods of detection, use, and manufacture.
Support those method for detection claims by disclosing methodology for amplification,
hybridization, sequencing, and the like that will be, or could be, used in those methods and
disclose the sequences of suitable primers and probes used in detection steps. In addition to
claims to the methods themselves, also claim the components used in those methods, such as
probes, primers, and kits comprising those probes and primers. Also consider including claims
that are directed to methods for identifying candidate therapeutics based on cell systems that
express gene and cDNA sequences.
If a protein or antibody having a native amino acid sequence will become a commercial
product, consider how that protein or antibody will be expressed and whether that expression
system will confer structural modifications that do not naturally occur in vivo. Disclose those
predicted changes in glycosylation patterns or other post-translational modifications and recite
them in composition claims that are directed to those proteins and antibodies.
* * * * *
The recent decisions from the U.S. Supreme Court and Federal Circuit will have a
tremendous effect on the protection of biotechnology inventions. Viewed collectively, those
decisions provide substantial insight and guidance on what claims are directed to patent eligible
subject matter and what claims are not. We recommend that you carefully consider those
decisions when developing strategies for protecting your valuable inventions to ensure that your
patents don’t run afoul of the judicially created exceptions to the patent eligible subject matter
recited in 35 U.S.C. § 101.