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Neurodevelopmental disorders: 2022 update.

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Summary

Recent research advances mechanistic understanding of neurodevelopmental disorders (NDDs). New findings link specific gene mutations, repeatome alterations, and astrocyte dysfunction to conditions like autism spectrum disorder (ASD) and Down syndrome (DS).

Keywords:
Aicardi-Goutières syndromeAutism spectrum disorderChromatin remodelerMitovesiclesRepeatometRNAs methylation

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Area of Science:

  • Neuroscience and Genetics
  • Developmental Biology
  • Molecular Pathology

Background:

  • Neurodevelopmental disorders (NDDs) affect 2-4% of the global population, encompassing conditions like intellectual disability (ID), autism spectrum disorder (ASD), Down syndrome (DS), and attention-deficit/hyperactivity disorder (ADHD).
  • The heterogeneity and overlapping symptoms of NDDs often lead to misdiagnosis, while the precise pathogenic mechanisms for many NDDs, including Rett syndrome and DS, remain unclear.

Purpose of the Study:

  • To review and highlight recent significant advancements in understanding the mechanistic basis of various neurodevelopmental disorders.
  • To explore novel insights into genetic mutations, molecular processes, and cellular functions implicated in NDD pathogenesis.

Main Methods:

  • Review of recent preclinical models and genetic studies.
  • Bioinformatic analysis of the human repeatome.
  • Investigation into mitochondrial contributions and astrocyte roles in neuropathology.

Main Results:

  • Established causality between PAK3 mutations and social deficiencies; linked ARID1B mutations to neuroectoderm specification.
  • Identified DNA damage as a mechanism in Aicardi-Goutières syndrome and highlighted translation/histone acetylation roles in X-linked ID and Rett syndrome.
  • Advanced understanding of the repeatome's role in ASD, discovered mitochondrial vesicles in DS, and revealed astrocyte dysfunction in ASD and DS.

Conclusions:

  • Significant progress has been made in elucidating the molecular and cellular underpinnings of diverse NDDs.
  • New research directions include the role of the repeatome, mitochondria, and astrocytes, offering potential targets for future therapeutic strategies.