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Recessive mutations in POLR1C cause a leukodystrophy by impairing biogenesis of RNA polymerase III.

Nature communications | 2015

A small proportion of 4H (Hypomyelination, Hypodontia and Hypogonadotropic Hypogonadism) or RNA polymerase III (POLR3)-related leukodystrophy cases are negative for mutations in the previously identified causative genes POLR3A and POLR3B. Here we report eight of these cases carrying recessive mutations in POLR1C, a gene encoding a shared POLR1 and POLR3 subunit, also mutated in some Treacher Collins syndrome (TCS) cases. Using shotgun proteomics and ChIP sequencing, we demonstrate that leukodystrophy-causative mutations, but not TCS mutations, in POLR1C impair assembly and nuclear import of POLR3, but not POLR1, leading to decreased binding to POLR3 target genes. This study is the first to show that distinct mutations in a gene coding for a shared subunit of two RNA polymerases lead to selective modification of the enzymes' availability leading to two different clinical conditions and to shed some light on the pathophysiological mechanism of one of the most common hypomyelinating leukodystrophies, POLR3-related leukodystrophy.

Pubmed ID: 26151409 RIS Download

Research resources used in this publication

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Antibodies used in this publication

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Associated grants

  • Agency: NIGMS NIH HHS, United States
    Id: P41 GM103533
  • Agency: NIMH NIH HHS, United States
    Id: R01 MH067880
  • Agency: NCATS NIH HHS, United States
    Id: UL1 TR000075
  • Agency: NHLBI NIH HHS, United States
    Id: HHSN268201000035C
  • Agency: Canadian Institutes of Health Research, Canada
    Id: MOP-G-287547
  • Agency: NIMH NIH HHS, United States
    Id: R01 MH100175
  • Agency: PHS HHS, United States
    Id: HHSN268201000035C
  • Agency: NCATS NIH HHS, United States
    Id: UL1TR000075

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