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ATXN1 protein family and CIC regulate extracellular matrix remodeling and lung alveolarization.

Developmental cell | Oct 18, 2011

Although expansion of CAG repeats in ATAXIN1 (ATXN1) causes Spinocerebellar ataxia type 1, the functions of ATXN1 and ATAXIN1-Like (ATXN1L) remain poorly understood. To investigate the function of these proteins, we generated and characterized Atxn1L(-/-) and Atxn1(-/-); Atxn1L(-/-) mice. Atxn1L(-/-) mice have hydrocephalus, omphalocele, and lung alveolarization defects. These phenotypes are more penetrant and severe in Atxn1(-/-); Atxn1L(-/-) mice, suggesting that ATXN1 and ATXN1L are functionally redundant. Upon pursuing the molecular mechanism, we discovered that several Matrix metalloproteinase (Mmp) genes are overexpressed and that the transcriptional repressor Capicua (CIC) is destabilized in Atxn1L(-/-) lungs. Consistent with this, Cic deficiency causes lung alveolarization defect. Loss of either ATXN1L or CIC derepresses Etv4, an activator for Mmp genes, thereby mediating MMP9 overexpression. These findings demonstrate a critical role of ATXN1/ATXN1L-CIC complexes in extracellular matrix (ECM) remodeling during development and their potential roles in pathogenesis of disorders affecting ECM remodeling.

Pubmed ID: 22014525 RIS Download

Mesh terms: Animals | Ataxin-1 | Ataxins | Biomarkers | Blotting, Western | Chromatin Immunoprecipitation | Extracellular Matrix | Female | Gene Expression Profiling | Gene Expression Regulation | Immunoenzyme Techniques | Male | Matrix Metalloproteinase 9 | Mice | Mice, Knockout | Nerve Tissue Proteins | Nuclear Proteins | Oligonucleotide Array Sequence Analysis | Organogenesis | Phenotype | Proto-Oncogene Proteins c-ets | Pulmonary Alveoli | RNA, Messenger | Repressor Proteins | Reverse Transcriptase Polymerase Chain Reaction

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Associated grants

  • Agency: NIDDK NIH HHS, Id: DK 56338
  • Agency: NINDS NIH HHS, Id: R01 NS027699-23
  • Agency: NICHD NIH HHS, Id: P30 HD024064
  • Agency: NINDS NIH HHS, Id: NS27699
  • Agency: Howard Hughes Medical Institute, Id: T32 NS043124
  • Agency: NINDS NIH HHS, Id: P30 DK056338
  • Agency: NIDDK NIH HHS, Id: R37 NS027699
  • Agency: NINDS NIH HHS, Id: R01 NS027699
  • Agency: NINDS NIH HHS, Id: HD24064
  • Agency: NICHD NIH HHS, Id:

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