Mouse brain expression patterns of Spg7, Afg3l1, and Afg3l2 transcripts, encoding for the mitochondrial m-AAA protease

被引:26
作者
Sacco, Tiziana [1 ,2 ]
Boda, Enrica [1 ,2 ]
Hoxha, Eriola [1 ,2 ]
Pizzo, Riccardo [1 ,2 ]
Cagnoli, Claudia [3 ,4 ]
Brusco, Alfredo [3 ,4 ]
Tempia, Filippo [1 ,2 ]
机构
[1] Univ Turin, Dept Neurosci, Physiol Sect, Turin, Italy
[2] Natl Inst Neurosci, Turin, Italy
[3] Univ Turin, Dept Genet Biol & Biochem, Turin, Italy
[4] Az Osp Univ San Giovanni Battista, SCDU Med Genet, Turin, Italy
来源
BMC NEUROSCIENCE | 2010年 / 11卷
关键词
HEREDITARY SPASTIC PARAPLEGIA; DEGENERATION; COMPLEX; IMPAIRMENT; MUTATIONS; SUBUNIT;
D O I
10.1186/1471-2202-11-55
中图分类号
Q189 [神经科学];
学科分类号
071006 ;
摘要
Background: The m-AAA (ATPases Associated with a variety of cellular Activities) is an evolutionary conserved metalloprotease complex located in the internal mitochondrial membrane. In the mouse, it is a hetero-oligomer variably formed by the Spg7, Afg3l1, and Afg3l2 encoded proteins, or a homo-oligomer formed by either Afg3l1 or Afg3l2. In humans, AFG3L2 and SPG7 genes are conserved, whereas AFG3L1 became a pseudogene. Both AFG3L2 and SPG7 are involved in a neurodegenerative disease, namely the autosomal dominant spinocerebellar ataxia SCA28 and a recessive form of spastic paraplegia, respectively. Results: Using quantitative RT-PCR, we measured the expression levels of Spg7, Afg3l1, and Afg3l2 in the mouse brain. In all regions Afg3l2 is the most abundant transcript, followed by Spg7, and Afg3l1, with a ratio of approximately 5: 3: 1 in whole-brain mRNA. Using in-situ hybridization, we showed that Spg7, Afg3l1 and Afg3l2 have a similar cellular pattern of expression, with high levels in mitral cells, Purkinje cells, deep cerebellar nuclei cells, neocortical and hippocampal pyramidal neurons, and brainstem motor neurons. However, in some neuronal types, differences in the level of expression of these genes were present, suggesting distinct degrees of contribution of their proteins. Conclusions: Neurons involved in SCA28 and hereditary spastic paraplegia display high levels of expression, but similar or even higher expression is also present in other types of neurons, not involved in these diseases, suggesting that the selective cell sensitivity should be attributed to other, still unknown, mechanisms.
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页数:9
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