Abstract:
:The SMN2 transgenic mouse, Tg(SMN2)89Ahmb, has emerged as the most widely used in spinal muscular atrophy (SMA) research. Here we clone the genomic integration site of the transgene and demonstrate it to be in intron 4 of the metabotropic glutamate receptor 7 (mGluR7) gene. We found that the integration of this transgene significantly reduced both mGluR7 mRNA and protein levels (24% and 9%, respectively). To determine if phenotypes associated with mGluR7 knockout mice were present in Tg(SMN2)89Ahmb containing mice, we subjected mice homozygous for the transgene to open field and seizure susceptibility tests. When compared to wild type FVB/N mice, Tg(SMN2)89Ahmb(tg/tg) mice exhibited significantly longer times in finding a safe wall-adjacent square (+54s if Smn(+/+), +90s if Smn(+/-)), as well as a significantly higher frequency of generalized seizure in response to a subthreshold dose of pentylenetrazol (0.11 vs 0.45). These findings aid in explaining the sudden unexpected death that occurs within SMA mouse colonies that contain a homozygous Tg(SMN2)89Ahmb transgene. This should be taken into account in pre-clinical studies that utilize this transgene, especially in therapy-treated SMA mice that have extended survival.
journal_name
Neurobiol Disjournal_title
Neurobiology of diseaseauthors
Gogliotti RG,Lutz C,Jorgensen M,Huebsch K,Koh S,Didonato CJdoi
10.1016/j.nbd.2011.03.002subject
Has Abstractpub_date
2011-07-01 00:00:00pages
142-51issue
1eissn
0969-9961issn
1095-953Xpii
S0969-9961(11)00073-8journal_volume
43pub_type
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