Abstract: The disclosure relates to compositions and methods for treating chitinase 3-like protein 1/YKL-40 (CHI3L1/YKL-40)-associated diseases and disorders. More particularly, the disclosure relates to CHI3L1/YKL-40-targeting RNAi agents and methods, as well as methods of inhibiting expression of a CHI3L1/YKL-40 gene and methods of treating subjects having a CHI3L1/YKL-40-associated disease or disorder, such as cerebral amyloid angiopathy (CAA) and early onset familial Alzheimer disease (EOFAD or eFAD), using such dsRNAi agents and compositions.

Abstract: One aspect of the present invention relates to a double stranded iRNA agent comprising an antisense strand which is complementary to a target gene and one or more lipophilic moieties conjugated to one or more internal positions on at least one strand, which provides for targeting to, and uptake by, tissues and cells of the CNS via administration to a subarachnoid space, e.g., the cisterna magna. Another aspect of the invention relates to a method of gene silencing in tissues and cells of the CNS, that includes administering to the subarachnoid space of a subject in need thereof a therapeutically effective amount of the lipophilic moieties-conjugated double-stranded iRNAs.

Abstract: The disclosure relates to double stranded ribonucleic acid (dsRNAi) agents and compositions targeting an anaplastic lymphoma kinase (ALK) gene, as well as methods of inhibiting expression of an ALK gene and methods of treating subjects having an ALK-associated disease or disorder, e.g., type 2 diabetes, obesity, or an obesity-associated disorder, using such dsRNAi agents and compositions.

Abstract: The disclosure relates to double stranded ribonucleic acid (dsRNAi) agents and compositions targeting an alpha-2A adrenergic receptor (ADRA2A) gene, as well as methods of inhibiting expression of an ADRA2A gene and methods of treating subjects having an ADRA2A-associated disease or disorder, e.g., a primary tauopathy or Alzheimer's disease, using such dsRNAi agents and compositions.