Abstract:
:We have previously shown that increased dosage of the mouse protein zero gene (Mpz) causes a dysmyelinating neuropathy in transgenic (Tg80) mice. To ask whether the dysmyelination is dose dependent, we inbred one of the Tg80 lines and compared the resulting phenotype in homozygous and heterozygous mice. Whereas heterozygous mice (30% overexpression) have only transient peripheral nerve hypomyelination at two weeks after birth and normal myelin at four weeks after birth, homozygous mice demonstrated more severely hypomyelinated nerves. In the latter, many Schwann cells had achieved a one-to-one relationship with large axons but formed no myelin at four weeks after birth. Expression analysis confirmed a doubling of Mpz overexpression in the sciatic nerves of the homozygous mice. Thus, a threshold exists for Mpz overexpression, above which dysmyelination results. These data have important implications for replacement therapy in Charcot-Marie-Tooth 1B neuropathies due to loss of P0 function.
journal_name
Ann N Y Acad Scijournal_title
Annals of the New York Academy of Sciencesauthors
Quattrini A,Feltri ML,Previtali S,Fasolini M,Messing A,Wrabetz Ldoi
10.1111/j.1749-6632.1999.tb08591.xsubject
Has Abstractpub_date
1999-10-01 00:00:00pages
294-301issue
1eissn
0077-8923issn
1749-6632journal_volume
883pub_type
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