The interim unaudited condensed financial statements and this Management's
Discussion and Analysis of Financial Condition and Results of Operations should
be read in conjunction with the financial statements and notes thereto for the
year ended December 31, 2021 and the related Management's Discussion and
Analysis of Financial Condition and Results of Operations, both of which are
contained in our Annual Report on Form 10-K for the year ended December 31,
2021, or Annual Report, filed with the Securities and Exchange Commission on
March 10, 2022. Past operating results are not necessarily indicative of results
that may occur in future periods.

FORWARD-LOOKING STATEMENTS



This quarterly report on Form 10-Q contains "forward-looking statements" within
the meaning of the federal securities laws made pursuant to the safe harbor
provisions of the Private Securities Litigation Reform Act of 1995. Our actual
results could differ materially from those anticipated in these forward-looking
statements as a result of various factors, including those set forth below under
Part II, Item 1A, "Risk Factors" in this quarterly report on Form 10-Q. Except
as required by law, we assume no obligation to update these forward-looking
statements, whether as a result of new information, future events or otherwise.
These statements, which represent our current expectations or beliefs concerning
various future events, may contain words such as "may," "will," "expect,"
"anticipate," "intend," "plan," "believe," "estimate" or other words indicating
future results, though not all forward-looking statements necessarily contain
these identifying words. Such statements may include, but are not limited to,
statements concerning the following:


•the initiation, cost, timing, progress and results of, and our expected ability
to undertake certain activities and accomplish certain goals with respect to our
research and development activities, preclinical studies and clinical trials;

•our ability to obtain and maintain regulatory approval of our product candidates, and any related restrictions, limitations, and/or warnings in the label of an approved product candidate;

•our ability to obtain funding for our operations;

•our plans to research, develop and commercialize our product candidates;


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•the potential election of any strategic collaboration partner to pursue development and commercialization of any programs or product candidates that are subject to a collaboration with such partner;

•our ability to attract collaborators with relevant development, regulatory and commercialization expertise;

•future activities to be undertaken by our strategic collaboration partners, collaborators and other third parties;

•our ability to obtain and maintain intellectual property protection for our product candidates;

•the size and growth potential of the markets for our product candidates, and our ability to serve those markets;

•our ability to successfully commercialize, and our expectations regarding future therapeutic and commercial potential with respect to our product candidates;

•the rate and degree of market acceptance of our product candidates;

•our ability to develop sales and marketing capabilities, whether alone or with potential future collaborators;

•regulatory developments in the United States and foreign countries;

•the performance of our third-party suppliers and manufacturers;

•the success of competing therapies that are or may become available;

•the loss of key scientific or management personnel;

•our ability to successfully secure and deploy capital;

•our ability to satisfy our debt obligations;

•the accuracy of our estimates regarding future expenses, future revenues, capital requirements and need for additional financing;

•the potential impact of the COVID-19 pandemic on our business; and

•the risks and other forward-looking statements described under the caption "Risk Factors" under Part II, Item 1A of this quarterly report on Form 10-Q.



In addition, statements that "we believe" and similar statements reflect our
beliefs and opinions on the relevant subject. These statements are based upon
information available to us as of the date of this report, and while we believe
such information forms a reasonable basis for such statements, such information
may be limited or incomplete, and our statements should not be read to indicate
that we have conducted an exhaustive inquiry into, or review of, all potentially
available relevant information. These statements are inherently uncertain and
investors are cautioned not to unduly rely upon these statements.

OVERVIEW



We are a clinical-stage biopharmaceutical company focused on discovering and
developing first-in-class drugs targeting microRNAs to treat diseases with
significant unmet medical need. We were formed in 2007 when Alnylam
Pharmaceuticals, Inc. ("Alnylam") and Ionis Pharmaceuticals, Inc. ("Ionis")
contributed significant intellectual property, know-how and financial and human
capital to pursue the development of drugs targeting microRNAs pursuant to a
license and collaboration agreement. Our lead product candidate is RGLS8429, an
anti-miR targeting miR-17, our next-generation compound for the treatment of
autosomal dominant polycystic kidney disease ("ADPKD"). In May 2022, the U.S.
Food and Drug Administration ("FDA") accepted our Investigational New Drug
application ("IND") for RGLS8429. We initiated a Phase 1 study for RGLS8429 in
June 2022. In addition to this program, we continue to develop a pipeline of
other preclinical drug product candidates.

microRNAs are naturally occurring ribonucleic acid ("RNA") molecules that play a
critical role in regulating key biological pathways. Scientific research has
shown that an imbalance, or dysregulation, of microRNAs is directly linked to
many diseases. Furthermore, many different infectious pathogens interact and
bind to host microRNA to survive. To date, over 500 microRNAs have been
identified in humans, each of which can bind to multiple messenger RNAs that
control key aspects of cell biology. Since many diseases are multi-factorial,
involving multiple targets and pathways, the ability to modulate multiple
pathways by targeting a single microRNA provides a new therapeutic approach for
treating complex diseases.

RNA plays an essential role in the process used by cells to encode and translate
genetic information from deoxyribonucleic acid ("DNA") to proteins. RNA is
comprised of subunits called nucleotides and is synthesized from a DNA template
by a process known as transcription. Transcription generates different types of
RNA, including messenger RNAs that carry the information for proteins in the
sequence of their nucleotides. In contrast, microRNAs are RNAs that do not code
for
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proteins but rather are responsible for regulating gene expression by modulating
the translation and decay of target messenger RNAs. By interacting with many
messenger RNAs, a single microRNA can regulate the expression of multiple genes
involved in the normal function of a biological pathway. Many pathogens,
including viruses, bacteria and parasites, also use host microRNAs to regulate
the cellular environment for survival. In some instances, the host microRNAs are
essential for the replication and/or survival of the pathogen. For example,
miR-122 is a microRNA expressed in human hepatocytes and is a key factor for the
replication of the hepatitis C virus ("HCV").

We believe that microRNA therapeutics have the potential to become a new and major class of drugs with broad therapeutic application for the following reasons:

•microRNAs play a critical role in regulating biological pathways by controlling the translation of many target genes;

•microRNA therapeutics regulate disease pathways which may result in more effective treatment of complex multi-factorial diseases;



•many human pathogens, including viruses, bacteria and parasites, use microRNAs
(host and pathogen encoded) to enable their replication and suppression of host
immune responses; and

•microRNA therapeutics may be synergistic with other therapies because of their different mechanism of action.



We have assembled significant expertise in the microRNA field, including
expertise in microRNA biology and oligonucleotide chemistry, a broad
intellectual property estate, relationships with key opinion leaders and a
disciplined drug discovery and development process. We are using our microRNA
expertise to develop chemically modified, single-stranded oligonucleotides that
we call anti-miRs to modulate microRNAs and address underlying disease. We
believe microRNAs may play a critical role in complex disease and that targeting
them with anti-miRs may become a source of a new and major class of drugs with
broad therapeutic application, much like small molecules, biologics and
monoclonal antibodies.

We believe that microRNA biomarkers may be used to select optimal patient
segments in clinical trials and to monitor disease progression or relapse. We
believe these microRNA biomarkers can be applied toward drugs that we develop
and drugs developed by other companies with which we partner or collaborate.

Since our inception through June 30, 2022, we have received $416.4 million from
the sale of our equity and convertible debt securities, $101.8 million from our
strategic collaborations, principally from upfront payments, research funding
and preclinical and clinical milestones, and $19.8 million in net proceeds from
our Term Loan. As of June 30, 2022, we had cash, cash equivalents and short-term
investments of $47.5 million.

Lead Programs



RGLS8429: RGLS8429 is an anti-miR next-generation oligonucleotide targeting
miR-17 for the treatment of ADPKD. In October 2021, we announced that we would
discontinue further development of RGLS4326, our first-generation compound for
the treatment of ADPKD, based on discussions with the FDA and data from the
second cohort of patients in the Phase 1b trial of RGLS4326. We believe RGLS8429
has a superior pharmacologic profile compared with RGLS4326 in preclinical
studies. In both in vitro and in vivo efficacy studies, RGLS8429 exhibits equal
potency for its molecular target (miR-17) as RGLS4326. Furthermore, in
recently-completed IND-enabling 13-week toxicity studies, RGLS8429 was well
tolerated at dose levels higher than those that resulted in off-target central
nervous system effects in the chronic toxicity studies of RGLS4326.

In May 2022, the FDA accepted our IND for RGLS8429 for the treatment of ADPKD.
In June 2022, we initiated a Phase 1 single-ascending dose ("SAD") study in
healthy volunteers to assess safety, tolerability and PK of RGLS8429. Following
the SAD study, we plan to initiate a Phase 1b MAD study in adult patients with
ADPKD to assess safety, tolerability and PK of RGLS8429, and to evaluate the
efficacy of RGLS8429 treatment across three different dose levels, including
changes in polycystins, cystic kidney volume (htTKV), and overall kidney
function. Top-line data from the healthy volunteer portion of the study are
expected in the second half of 2022, and top-line biomarker data for the first
cohort of RGLS8429-treated patients with ADPKD are expected in the first half of
2023. In June 2022, the FDA granted orphan drug designation to RGLS8429 for the
treatment of ADPKD.

RG-012: In May 2017, we completed a Phase 1 multiple-ascending dose ("MAD")
clinical trial in 24 healthy volunteers (six-week repeat dosing) to determine
safety, tolerability and pharmacokinetics ("PK") of RG-012 prior to chronic
dosing in patients. RG-012 was well-tolerated and no serious adverse events
("SAEs") were reported. In the third quarter of 2017, we initiated HERA, a Phase
2 randomized (1:1), double-blinded, placebo-controlled clinical trial evaluating
the safety and efficacy of RG-012 in 40 Alport syndrome patients. In parallel, a
renal biopsy study was also initiated in the third quarter of 2017 to evaluate
RG-012 renal tissue PK, target engagement and downstream effects on genomic
disease biomarkers. Kidney tissue concentrations were achieved in biopsy
patients that would be predictive of therapeutic benefit based on animal disease
models.
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In addition, modulation of the target, miR-21, was observed. In December 2017,
we concluded our global ATHENA natural history of disease study. RG-012 has
received orphan designation in both the United States and Europe. In November
2018, we and Sanofi agreed to transition further development activities of our
miR-21 programs, including our RG-012 program, to Sanofi. As a result, Sanofi
became responsible for all costs incurred in the development of these miR-21
programs. The transition activities, including the transfer of the IND, were
completed in the second quarter of 2019. In July 2022,
Sanofi notified us of its decision to terminate the HERA trial for failure to
meet Sanofi's pre-defined futility criteria. Sanofi also notified us that it is
currently evaluating different opportunities with respect to RG-012.

Preclinical Pipeline



A major focus of our preclinical research has historically targeted dysregulated
microRNAs implicated in diseases of high unmet medical need where we know we can
effectively deliver to the target tissue or organ, such as the liver, kidney and
central nervous system ("CNS"). Furthermore, we are investigating the potential
for target organ-selective delivery strategies.

FINANCIAL OPERATIONS OVERVIEW

Revenue

Our revenues generally consist of upfront payments for licenses or options to obtain licenses in the future, milestone payments and payments for other research services under collaboration agreements.



In the future, we may generate revenue from a combination of license fees and
other upfront payments, payments for research and development services,
milestone payments, product sales and royalties in connection with strategic
collaborations. We expect that any revenue we generate will fluctuate from
quarter-to-quarter as a result of the timing of our achievement of preclinical,
clinical, regulatory and commercialization milestones, if at all, the timing and
amount of payments relating to such milestones and the extent to which any of
our products are approved and successfully commercialized by us or our strategic
collaboration partners. If our current or future collaboration partners do not
elect or otherwise agree to fund our development costs pursuant to our current
or future strategic collaboration agreements, or we or our strategic
collaboration partner fails to develop product candidates in a timely manner or
obtain regulatory approval for them, our ability to generate future revenues,
and our results of operations and financial position would be adversely
affected.

Research and development expenses

Research and development expenses consist of costs associated with our research activities, including our drug discovery efforts and the development of our therapeutic programs. Our research and development expenses include:

•employee-related expenses, including salaries, benefits, travel and stock-based compensation expense;

•external research and development expenses incurred under arrangements with third parties, such as contract research organizations, or CROs, contract manufacturing organizations, or CMOs, other clinical trial related vendors, consultants and our scientific advisors;

•license fees; and

•facilities, depreciation and other allocated expenses, which include direct and allocated expenses for rent and maintenance of facilities, amortization of leasehold improvements and equipment, and laboratory and other supplies.



We expense research and development costs as incurred. We account for
nonrefundable advance payments for goods and services that will be used in
future research and development activities as expenses when the service has been
performed or when the goods have been received. Certain of the raw materials
used in the process of manufacturing drug product are capitalized upon their
acquisition and expensed upon usage, as we have determined these materials have
alternative future use.

To date, we have conducted research on many different microRNAs with the goal of
understanding how they function and identifying those that might be targets for
therapeutic modulation. At any given time we are working on multiple targets,
primarily within our therapeutic areas of focus. Our organization is structured
to allow the rapid deployment and shifting of resources to focus on the most
promising targets based on our ongoing research. As a result, in the early phase
of our development programs, our research and development costs are not tied to
any specific target. However, we are currently spending the vast majority of our
research and development resources on our ADPKD program.

Since our inception, we have incurred a total of approximately $399.6 million in research and development expenses through June 30, 2022.


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The process of conducting clinical trials and preclinical studies necessary to
obtain regulatory approval is costly and time consuming. We, or our strategic
collaboration partners, may never succeed in achieving marketing approval for
any of our product candidates. The probability of success for each product
candidate may be affected by numerous factors, including preclinical data,
clinical data, competition, manufacturing capability and commercial viability.

Successful development of future product candidates is highly uncertain and may
not result in approved products. Completion dates and completion costs can vary
significantly for each future product candidate and are difficult to predict. We
anticipate we will make determinations as to which programs to pursue and how
much funding to direct to each program on an ongoing basis in response to our
ability to maintain or enter into new collaborations with respect to each
program or potential product candidate, the scientific and clinical success of
each future product candidate, as well as ongoing assessments as to each future
product candidate's commercial potential. We will need to raise additional
capital and may seek additional collaborations in the future in order to advance
our various programs.

General and administrative expenses



General and administrative expenses consist primarily of salaries and related
benefits, including stock-based compensation, related to our executive, finance,
legal, business development and support functions. Other general and
administrative expenses include allocated facility-related costs not otherwise
included in research and development expenses and professional fees for
auditing, tax and legal services, some of which are incurred as a result of
being a publicly-traded company.

Other income (expense), net



Other income (expense) consists primarily of interest income and expense and
various income or expense items of a non-recurring nature. We earn interest
income from interest-bearing accounts and money market funds. Interest expense
is primarily attributable to interest charges associated with borrowings under
our secured Term Loan.

CRITICAL ACCOUNTING POLICIES AND ESTIMATES



There have been no significant changes to our critical accounting policies since
December 31, 2021. For a description of critical accounting policies that affect
our significant judgments and estimates used in the preparation of our financial
statements, refer to Item 7 in Management's Discussion and Analysis of Financial
Condition and Results of Operations and Note 1 to our financial statements
contained in our Annual Report and Note 1 to our condensed financial statements
contained in this quarterly report on Form 10-Q.

RESULTS OF OPERATIONS

Comparison of the three and six months ended June 30, 2022 and 2021

The following table summarizes our results of operations for the three and six months ended June 30, 2022 and 2021 (in thousands):



                                                               Three months ended                             Six months ended
                                                                    June 30,                                      June 30,
                                                          2022                     2021                 2022                    2021

Research and development expenses                          4,708                   4,150                 8,387                   7,470
General and administrative expenses                        2,467                   2,488                 5,357                   4,967
Interest and other (expenses) income, net                    (83)                    605                  (232)                    391


Research and development expenses

The following tables summarize the components of our research and development expenses for the periods indicated, together with year-over-year changes (dollars in thousands):


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                                                                                                                                    Increase (decrease)
                                       Three months                                 Three months
                                      ended June 30,                               ended June 30,
                                           2022               % of total                2021               % of total                $                 %
Research and development
   Personnel and internal expenses   $       1,798                    38  %       $       1,534                    37  %       $       264             17  %
   Third-party and outsourced
expenses                                     2,785                    59  %               2,346                    56  %               439             19  %
Non-cash stock-based compensation               99                     2  %                 229                     6  %              (130)           (57) %
Depreciation                                    25                     1  %                  41                     1  %               (16)           (39) %
Total research and development
expenses                             $       4,707                   100  %       $       4,150                   100  %       $       557             13  %


                                                                                                                                    Increase (decrease)
                                     Six months ended                             Six months ended
                                      June 30, 2022           % of total           June 30, 2021           % of total                $                 %
Research and development
   Personnel and internal expenses   $       3,512                    42  %       $       3,055                    41  %       $       457             15  %
   Third-party and outsourced
expenses                                     4,461                    53  %               3,633                    49  %               828             23  %
Non-cash stock-based compensation              369                     4  %                 410                     5  %               (41)           (10) %
Depreciation                                    45                     1  %                 372                     5  %              (327)           (88) %
Total research and development
expenses                             $       8,387                   100  %       $       7,470                   100  %       $       917             12  %


Research and development expenses were $4.7 million and $8.4 million for the
three and six months ended June 30, 2022, respectively, compared to $4.2 million
and $7.5 million for the three and six months ended June 30, 2021, respectively.
These amounts reflect the internal and external costs associated with advancing
our clinical and preclinical pipeline. The aggregate increases for the three and
six months ended June 30, 2022, as compared to the three and months ended June
30, 2021, were primarily attributable to increases in internal and external
research and development expenses, which were primarily driven by increases in
spend on activities for our RGLS8429 program.

General and administrative expenses



General and administrative expenses were $2.5 million and $5.4 million for the
three and six months ended June 30, 2022, respectively, compared to $2.5 million
and $5.0 million for the three and six months ended June 30, 2021, respectively.
The increase for the six months ended June 30, 2022, as compared to the six
months ended June 30, 2021, was attributable to a general increase in
personnel-related and ongoing general business operating costs.

Interest and other (expenses) income, net



Net interest and other expenses were $0.1 million and $0.2 million for the three
and six months ended June 30, 2022, respectively, compared to net interest and
other income of $0.6 million and $0.4 million for the three and six months ended
June 30, 2021, respectively. The amounts for the three and six months ended June
30, 2022 were primarily related to interest charges associated with our
outstanding Term Loan, partially offset by interest earned on our short-term
investments. The net interest income amounts for the three and six months ended
June 30, 2021 included a $0.7 million gain on forgiveness of our PPP loan during
the three months ended June 30, 2021, partially offset by interest charges
associated with our outstanding Term Loan.

LIQUIDITY AND CAPITAL RESOURCES



As of June 30, 2022, we had cash, cash equivalents and short-term investments of
$47.5 million. We believe that our existing cash and cash equivalents will be
sufficient to fund our anticipated and operating capital expenditure
requirements into the fourth quarter of 2023. If we are unable to maintain
sufficient financial resources, our business, financial condition and results of
operations will be materially and adversely affected. We will need to raise
additional capital to develop our product candidates and implement our operating
plans. There can be no assurance that we will be able to obtain this needed
financing on acceptable terms or at all. Additionally, equity or debt financings
may have a dilutive effect on the holdings of our existing stockholders.
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Our future capital requirements are difficult to forecast and will depend on many factors, including:

•the terms and timing of any strategic collaboration, licensing and other arrangements that we may establish;

•the initiation, progress, timing and completion of preclinical studies and clinical trials for our development programs and product candidates, and associated costs;

•the number and characteristics of product candidates that we pursue;

•the outcome, timing and cost of regulatory approvals;

•delays that may be caused by changing regulatory requirements;

•the cost and timing of hiring new employees to support our continued growth;

•the costs involved in filing and prosecuting patent applications and enforcing and defending patent claims;

•the costs and timing of procuring clinical and commercial supplies of our product candidates;

•the costs and timing of establishing sales, marketing and distribution capabilities, and the pricing and reimbursement for any products for which we may receive regulatory approval;



•the extent to which we acquire or invest in businesses, products or
technologies;
•whether and when we achieve any milestones under our collaboration and license
agreement with Sanofi; and
•payments under our Term Loan.

To date, we have funded our operations primarily through the sale of equity, and
to a lesser extent, through convertible debt, up-front payments, research
funding and milestone payments under collaborative arrangements. Since
inception, we have primarily devoted our resources to funding research and
development, including discovery research, and preclinical and clinical
development activities. To fund future operations, we will likely need to raise
additional capital. We anticipate that we will seek to fund our operations
through public or private equity or debt financings or other sources, such as
potential collaboration agreements. We cannot make assurances that anticipated
additional financing will be available to us on favorable terms, or at all.
Although we have previously been successful in obtaining financing through our
equity securities offerings, there can be no assurance that we will be able to
do so in the future. The global credit and financial markets have experienced
extreme volatility, including in liquidity and credit availability, declines in
consumer confidence, declines in economic growth, and uncertainty about economic
stability. There can be no assurance that deterioration in credit and financial
markets and confidence in economic conditions will not occur. If equity and
credit markets deteriorate, it may make any necessary debt or equity financing
more difficult to obtain, more costly and/or more dilutive.


The following table shows a summary of our cash flows for the six months ended June 30, 2022 and 2021 (in thousands):



                                       Six months ended
                                           June 30,
                                     2022           2021
                                         (unaudited)
Net cash (used in) provided by:
Operating activities              $ (12,540)     $ (10,735)
Investing activities                (12,726)          (184)
Financing activities                      2         21,334
Total                             $ (25,264)     $  10,415


Operating activities

Net cash used in operating activities was $12.5 million for the six months ended
June 30, 2022, compared to $10.7 million for the six months ended June 30, 2021.
The increase in net cash used in operating activities was attributable to a $1.9
million increase in net loss for the six months ended June 30, 2022, as compared
to the same period in 2021.

Investing activities

Net cash used in investing activities was $12.7 million for the six months ended
June 30, 2022, compared to $0.2 million for the six months ended June 30, 2021.
The increase in net cash used in investing activities was attributable to cash
and cash equivalents used to purchase $12.4 million of short-term investments
(U.S. Treasury securities) during the three months ended June 30, 2022.

Financing activities


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Net cash provided by financing activities was less than $0.1 million for the six
months ended June 30, 2022, compared to $21.3 million for the six months ended
June 30, 2021. Net cash provided by financing activities for the six months
ended June 30, 2021 was primarily attributable to proceeds from the issuance of
our common stock pursuant to our Common Stock Sales Agreement with H.C.
Wainwright & Co., LLC.

MATERIAL CASH REQUIREMENTS

As of June 30, 2022, there have been no material changes, outside of the ordinary course of business, in our outstanding contractual obligations or in our material cash requirements from those disclosed under the subheading Material Cash Requirements in our Annual Report.

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