Patent ID: 9622460
Date: 2017-04-18
CPC Classifications: A01K,C07K,C12N

Claim:
1. A genetically modified rodent animal, wherein the genome of said rodent animal comprises a replacement at an endogenous rodent IL-6 locus of a rodent gene encoding IL-6 with a human gene encoding human IL-6, wherein the human gene encoding human IL-6 is under control of endogenous rodent regulatory elements at the endogenous rodent IL-6 locus and is expressed, and the replaced rodent IL-6 gene is not expressed; wherein the genome of said rodent animal further comprises a replacement at an endogenous rodent IL-6Rα locus of a rodent nucleic acid encoding a rodent IL-6Rα ectodomain with a human nucleic acid encoding a human IL-6Rα ectodomain to form a humanized IL-6Rα gene, wherein the humanized IL-6Rα gene is under control of endogenous rodent regulatory elements at the endogenous rodent IL-6Rα locus, wherein the humanized IL-6Rα gene is expressed and encodes a humanized IL-6Rα protein which comprises said human IL-6Rα ectodomain and rodent IL-6Rα transmembrane and cytoplasmic domains; and wherein the rodent animal exhibits an acute phase response to an acute phase inducer and is a rat or a mouse.