Epigenetics and autism spectrum disorder: A report of an autism case with mutation in H1 linker histone HIST1H1E and literature review.

Published

Journal Article (Review)

Genetic mutations in genes encoding proteins involved in epigenetic machinery have been reported in individuals with autism spectrum disorder (ASD), intellectual disability, congenital heart disease, and other disorders. H1 histone linker protein, the basic component in nucleosome packaging and chromatin organization, has not been implicated in human disease until recently. We report a de novo deleterious mutation of histone cluster 1 H1 family member e (HIST1H1E; c.435dupC; p.Thr146Hisfs*50), encoding H1 histone linker protein H1.4, in a 10-year-old boy with autism and intellectual disability diagnosed through clinical whole exome sequencing. The c.435dupC at the 3' end of the mRNA leads to a frameshift and truncation of the positive charge in the carboxy-terminus of the protein. An expression study demonstrates the mutation leads to reduced protein expression, supporting haploinsufficiency of HIST1H1E protein and loss of function as an underlying mechanism of dysfunction in the brain. Taken together with other recent cases with mutations of HIST1H1E in intellectual disability, the evidence supporting the link to causality in disease is strong. Our finding implicates the deficiency of H1 linker histone protein in autism. The systematic review of candidate genes implicated in ASD revealed that 42 of 215 (19.5%) genes are directly involved in epigenetic regulations and the majority of these genes belong to histone writers, readers, and erasers. While the mechanism of how haploinsufficiency of HIST1H1E causes autism is entirely unknown, our report underscores the importance of further study of the function of this protein and other histone linker proteins in brain development.

Full Text

Duke Authors

Cited Authors

  • Duffney, LJ; Valdez, P; Tremblay, MW; Cao, X; Montgomery, S; McConkie-Rosell, A; Jiang, Y-H

Published Date

  • June 2018

Published In

Volume / Issue

  • 177 / 4

Start / End Page

  • 426 - 433

PubMed ID

  • 29704315

Pubmed Central ID

  • 29704315

Electronic International Standard Serial Number (EISSN)

  • 1552-485X

Digital Object Identifier (DOI)

  • 10.1002/ajmg.b.32631

Language

  • eng

Conference Location

  • United States