Abstract: Certain embodiments provide a method of providing added peripheral IDS activity to a subject with Hunter syndrome, comprising administering to the subject a therapeutically effective dose of a pharmaceutical composition comprising a protein comprising an IDS amino acid sequence and a TfR binding domain. The added peripheral IDS activity can be measured by comparing levels of keratan sulfate (KS) in the subject after administration of the pharmaceutical composition relative to a baseline level. Certain embodiments also provide methods of providing a clinical benefit to a subject with Hunter syndrome and improving treatment in a patient having non-neuronopathic Hunter syndrome, as well as methods and treatment regimens for resolving infusion related reactions (IRRs).

Abstract: Certain embodiments provide a fusion protein comprising an iduronate 2-sulfatase (IDS) amino acid sequence, an IDS variant amino acid sequence, or a catalytically active fragment thereof; and an anti-transferrin receptor (TfR) antibody as described herein, as well as methods of use thereof.

Abstract: Certain embodiments provide a method of treating Hunter syndrome in a subject in need thereof, comprising administering to the subject a therapeutically effective dose of a pharmaceutical composition comprising an ETV:IDS protein.

Abstract: Certain embodiments provide a method of detecting one or more biomarkers in a subject having a lysosomal storage disorder, the method comprising: 1) measuring the concentration of a combination of two or more lipids in a sample from the subject, wherein the combination of lipids is selected from the group consisting of: a) a bis(monoacylglycero)phosphate (BMP); b) a GM2 ganglioside and/or a GM3 ganglioside; c) a GD3 ganglioside; d) a GD1a/b ganglioside; and e) a glucosylceramide (GlcCer); 2) measuring the concentration of GlcCer in a sample from the subject; 3) measuring the concentration of neurofilament light chain (Nf-L) in a sample from the subject; and/or 4) measuring the concentration of soluble triggering receptor expressed on myeloid cells 2 (sTREM2) in a sample from the subject.