Q.   Is the fact that our sages taught that the chazer-pig will become in the days of the Moshiach a kosher animal a reflection on the artificial meat that Horav Miller is said to be kosher and pareve. One could use the DNA of a pig and create such animal?
 If one would actually genetically change the DNA of a chazer and make it into a ruminant animal would it be kosher?
 Is it only the chazer the animal that will become kosher or does it apply to all other non-kosher animal species?
 A.   On question 1230 we wrote that “Horav Shlomo Miller’s Shlita opinion is that the cultured meat is not considered meat. However, since the Mishna (Bechoros 5b) and Shulachan Aruch (Y.D. 79: 2) rule that food extracted from the impure is regarded as impure, even if it is not meat it is still prohibited. Therefore the original stem cells would have to be extracted from a kosher slaughtered animal. When the above was done, and all the nutrients used were kosher, the produce would need no salting and may in principle be permitted even with milk.”
From the above it is obvious that you cannot use the DNA of a pig to create kosher cultured pig meat, since food extracted from the impure is regarded as impure.
Nefesh Hachaim (Horav Ch. Plaggi, O. ches) quotes a Medresh Shochar Tov (146) on the posuk Hashem matir assurim, that teaches that all animals that are impure in this world, Hashem will purify them in the World to Come. (See similar in Orach Chaim ad. loc.)
Rabbi A. Bartfeld as revised by Horav Shlomo Miller Shlit’a