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JOURNAL ARTICLE
RESEARCH SUPPORT, N.I.H., EXTRAMURAL
RESEARCH SUPPORT, NON-U.S. GOV'T
TCAP knockdown by RNA interference inhibits myoblast differentiation in cultured skeletal muscle cells.
Neuromuscular Disorders : NMD 2008 May
Null mutation of titin-cap (TCAP) causes limb-girdle muscular dystrophy type 2G (LGMD2G). LGMD2G patients develop muscle atrophy, and lose the ability to walk by their third decade. Previous findings suggest that TCAP regulates myostatin, a key regulator of muscle growth. We tested the hypothesis that TCAP knockdown with RNA interference will lead to differential expression of genes involved in muscle proliferation and differentiation, impairing muscle cell growth. mRNA from cultured cells treated with TCAP siRNA duplex constructs was analyzed using Northern blots and real-time RT-PCR. siRNA treatment decreased TCAP mRNA expression in differentiating muscle cells. Significant (p<0.05) decreases in mRNA were observed for myogenic regulatory factors. siRNA treatment also prevented development of the normal phenotype of muscle cells. Our findings suggest that TCAP knockdown with RNA interference alters normal muscle cell differentiation.
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