A Trial to Learn if ALN-PNP is Safe and Well Tolerated in Healthy Adults and Adult Participants With Metabolic Dysfunction-Associated Steatotic Liver Disease (MASLD)

Prior treatment

• Is a current smoker or former smoker, including e-cigarettes, who stopped smoking within 3 months prior to the screening visit
• Has lost or gained more than 4.0% body weight over the 3 months prior to or during the screening period
• Bariatric surgery within approximately 5 years (Part B) or 3 years (Part C) prior or planned during the study period
  • NOTE: Other protocol defined inclusion / exclusion criteria apply

Other illness

• History of clinically significant cardiovascular, respiratory, hepatic, renal, gastrointestinal, endocrine, hematological, psychiatric, neurological, or dermatologic disease, as assessed by the investigator, that may confound the results of the study or poses an additional risk to the participant by study participation
• Using the Modification of Diet in Renal Disease equation, has a glomerular filtration rate as described in the protocol at the screening visit
• Has a history of alcohol or drug abuse per investigator opinion
• Is positive for hepatitis C antibody and if so, positive for qualitative (ie, detected or not detected) Hepatitis C Virus (HCV) Ribonucleic Acid (RNA) test at the screening visit
  • Part B and Part C:
• Evidence of other forms of known chronic liver disease, as defined in the protocol
• History of Type 1 diabetes
• Has known Human Immunodeficiency Virus (HIV) infection, evidence of current or chronic Hepatitis B Virus (HBV) infection, or current or chronic HCV infection, as defined in the protocol

Lab values

• Has Alanine Aminotransferase (ALT) or Aspartate Aminotransferase (AST) or total bilirubin above the Upper Limit of Normal (ULN) range

Other

• Part A:
• Presents any concern to the study investigator that might confound the results of the study or poses an additional risk to the participant by their participation in the study
• Hospitalized for any reason within 30 days of the screening visit
• Has a contraindication to MRI examinations, as defined in the protocol

• Part A (Healthy Adults):
• From 18 to 55 years of age
• For Japanese cohorts ONLY; the Japanese participant must:
  • Be Japanese, born in Japan, and have both biologic parents and 4 biologic grandparents who are ethnically Japanese and born in Japan
  • Have maintained a Japanese lifestyle, with no significant change since leaving Japan, including having access to Japanese food and adhering to a Japanese diet
  • Be living \<10 years outside of Japan
• Has a Body Mass Index (BMI) between 18 and 32 kg/m\^2, inclusive, at the screening visit
• Is judged by the investigator to be in good health, as described in the protocol
• Is in good health based on laboratory safety testing obtained at the screening visit and approximately within 24 hours prior to administration of study drug
  • Part B and Part C (Participants with MASLD):
• Part B: From 18 to 65 years of age
• Part C: From 18 to 75 years of age
• BMI from 23.0 kg/m2 to 40.0 kg/m2, inclusive, for East Asians (including but not limited to South Koreans, Chinese, Taiwanese, and Japanese) and BMI from 27.0 kg/m2 to 40.0 kg/m2, inclusive, for any other ethnicity at screening visit 1
• Liver fat content ≥8.5% as measured by MRI-PDFF at screening visit 3