Elimination of N-glycolylneuraminic acid from animal products for human use
The application is in the field of transgenic (non-human) organisms, sialic acid chemistry, metabolism and antigenicity. More particularly, the invention is related to a method to produce Neu5Gc-free animals and products therefrom comprising disrupting the CMAH gene and thereby reducing or eliminating Neu5Gc from biological material of non-humans.
1. An isolated tissue or serum obtained from a viable and fertile transgenic mouse that
a) comprises a genome having a homozygous mutation of the cytidine-5′-monophosphate N-acetyl neuraminic acid hydrolase (CMAH) gene,
b) lacks expression of enzymatically active CMAH protein encoded by said CMAH gene, and
c) lacks N-glycolylneuraminic acid (Neu5Gc) in one or more body fluid or tissue,
wherein said tissue or serum lacks Neu5Gc.
2. An isolated body fluid obtained from a viable and fertile transgenic mouse that
a) comprises a genome having a homozygous mutation of the cytidine-5′-monophosphate N-acetyl neuraminic acid hydrolase (CMAH) gene,
b) lacks expression of enzymatically active CMAH protein encoded by said CMAH gene, and
c) lacks N-glycolylneuraminic acid (Neu5Gc) in one or more body fluid or tissue, wherein said body fluid lacks Neu5Gc.