Mutations in hnRNPA1 are recently found in multiple families with amyotrophic lateral sclerosis (ALS). HnRNPA1 is known to regulate RNA processing and to interact with proteins related to varying cellular functions, but how hnRNPA1 mutation causes disease is not known. A critical step towards understanding hnRNPA1 pathogenesis is determining the effect of pathogenic mutation on hnRNPA1 function at both systematic and molecular levels. HnRNPA1, TDP-43 and FUS belong to ribonucleoprotein family and their mutations are all associated with ALS. The three ribonucleoproteins exhibit similarity in disease features: 1) the disease shows an autosomal dominant trait; 2) proteinopathy and mitochondrial impairment is prominent in the disease; and 3) both wildtype and mutant forms cause diseases when overexpressed in animal models. Even seven years after the discovery of TDP-43 mutation in ALS, how TDP-43 mutation causes the disease remains elusive. Our preliminary studies show that both deficiency and excess in hnRNPA1 expression causes neurotoxicity respectively in hnRNPA1 knockdown and transgenic rats, suggesting that hnRNPA1 must be tightly regulated to maintain its normal function. To unravel the effect of pathogenic mutation on hnRNPA1, we created hnRNPA1 knockin rats in which a single pathogenic mutation is introduced. The knockin rats differ from their wildtype littermates in a single nucleotide examined. Any phenotypes detected in the knockin rats must result from the pathogenic mutation. With unprecedented rat models, we will examine how pathogenic mutation impacts hnRNPA1 function at both the systematic and molecular levels, revealing the mechanism by which hnRNPA1 mutation causes neurodegeneration in ALS.

Public Health Relevance

Using novel rat models, this proposal will examine how pathogenic mutation impacts hnRNPA1 function at both systematic and molecular levels, improving our understanding of hnRNPA1 pathogenesis in amyotrophic lateral sclerosis.

Agency
National Institute of Health (NIH)
Institute
National Institute of Neurological Disorders and Stroke (NINDS)
Type
Research Project (R01)
Project #
7R01NS095962-05
Application #
10188709
Study Section
Special Emphasis Panel (ZRG1)
Program Officer
Gubitz, Amelie
Project Start
2020-06-11
Project End
2021-02-28
Budget Start
2020-06-11
Budget End
2021-02-28
Support Year
5
Fiscal Year
2020
Total Cost
Indirect Cost
Name
Florida International University
Department
Type
DUNS #
071298814
City
Miami
State
FL
Country
United States
Zip Code
33199
Huang, Bo; Wu, Qinxue; Zhou, Hongxia et al. (2016) Increased Ubqln2 expression causes neuron death in transgenic rats. J Neurochem 139:285-293