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To identify and characterize specific mRNAs that increase in abundance during differentiation of mouse 3T3-L1 preadipocytes, a cDNA library was constructed from poly(A)+RNA isolated from differentiated 3T3-L1 adipocytes. Mixed probe isotope ratio selection and RNA blot analyses have identified several unique cDNA clones that represent mRNA species expressed either exclusively or at dramatically increased levels in differentiated cells. Further characterization of one such clone (pAL422) revealed that the corresponding mRNA, detectable only after differentiation, is approximately the same length (600 +/- 150 bases) as the cDNA insert (672 bases). The complete nucleotide sequence of the cDNA insert in pAL422 revealed a single long open reading frame that encodes a 132 amino acid polypeptide (the 422 protein) of 14.6 kDa. These and other results suggest that this cDNA may represent a nearly full-length copy of the mRNA. Computer-assisted analyses showed that the 422 protein shares 69% and 64% homology with myelin P2 proteins from rabbit and bovine peripheral nerves, respectively, as well as 23% and 30% homology with fatty-acid binding proteins from rat liver and intestine, respectively. Moreover, the mRNA hybrid selected by pAL422 DNA directs the in vitro translation of an approximately equal to 13 kDa polypeptide, and this protein is specifically immunoprecipitated by antiserum against bovine myelin P2. These observations strongly suggest that the 422 protein is a structural, and possibly functional, analog of myelin P2.

Expression of specific mRNAs during adipose differentiation: identification of an mRNA encoding a homologue of myelin P2 protein.