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The purpose of this Phase IIa study is to evaluate the safety, tolerability and pharmacodynamics of ALLN-346 in subjects with hyperuricemia and gout, and with mild to moderate chronic kidney disease.

This is a randomized, double-blind, placebo-controlled parallel group, multi-center phase II clinical study or orally administered ALLN-346 in subjects with hyperuricemia, gout and mild to moderate chronic kidney disease over a two-week period. Subjects will be enrolled in two cohorts based on estimated glomerular filtration rate (eGFR).

Inclusion Criteria:

• Male or female, age 18 to 70 years
• Serum UA level ≥ 8.0 mg/dL at Screening (hyperuricemia)
• Meets 2015 American College of Rheumatology (ACR)/EULAR criteria for gout
• Screening eGFR of ≥60 - <90 mL/minute/1.73 m2 for Cohort A and ≥30 - <60 mL/minute/1.73 m2 for Cohort B.
• Concomitant medications stable for a minimum of 4 weeks prior to and during Screening
• Body Mass Index (BMI) ≥ 18 and ≤ 40 kg/m2, inclusive, at screening
• Not pregnant, not capable of pregnancy, not nursing, and agrees to use an effective method of contraception; males subjects must agree to abstain from sperm donation

Exclusion Criteria:

• Currently taking any oral urate-lowering medication within 2 weeks prior to Screening
• Prior uricase therapy or exposure to recombinant uricase, such as Rasburicase or Pegloticase
• Gout flare requiring treatment within 14 days prior to or during Screening
• Clinically significant finding during Screening, any ongoing clinically significant illness requiring a clinically significant intervention or change in management within 4 weeks prior to or during Screening
• History of GI surgery, including gastric sleeve, Roux-en-Y or gastric banding (unless gastric band removed for a minimum of 12 months prior to Screening
• Received treatment with or exposure to an Investigational drug or device within 30 days - prior to or during Screening
• Prior dosing in ALLN-346 clinical study
• Per Investigator judgment, is not an ideal clinical study candidate

Subjects, Investigators and laboratories involved in the conduct of the study will be blinded to subject treatment assignment