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R3HDM1 haploinsufficiency is associated with mild intellectual disability.

Daisuke Fukushi1, Mie Inaba2, Kimiko Katoh1

  • 1Department of Genetics, Institute for Developmental Research, Aichi Developmental Disability Center, Kasugai, Japan.

American Journal of Medical Genetics. Part A
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Summary

R3HDM1 haploinsufficiency in a young male caused mild intellectual disability and developmental delay. This genetic imbalance, involving R3HDM1 and MIR128-1, impacts neuronal growth.

Keywords:
R3HDM1genetic imbalanceintellectual disabilitymiR-128

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Area of Science:

  • Neurogenetics
  • Developmental Biology
  • Human Genetics

Background:

  • R3HDM1 (R3H domain containing 1) is an uncharacterized RNA-binding protein highly expressed in the human cerebral cortex.
  • Intellectual disability (ID) and developmental delay are complex neurodevelopmental disorders with diverse genetic etiologies.
  • Understanding the function of novel genes like R3HDM1 is crucial for diagnosing and potentially treating these conditions.

Purpose of the Study:

  • To report the first case of R3HDM1 haploinsufficiency in a human.
  • To investigate the functional impact of R3HDM1 deficiency on neuronal development.
  • To explore the genetic interplay between R3HDM1 and MIR128-1 in the context of neurodevelopmental disorders.

Main Methods:

  • Case study of a 12-year-old male with a pericentric inversion affecting R3HDM1.
  • Quantification of R3HDM1 levels in patient-derived lymphoblastoid cells.
  • In vitro knockdown of R3HDM1 in mouse embryonic hippocampal neurons.
  • Analysis of MIR128-1 expression in relation to the inversion.

Main Results:

  • The patient presented with mild ID and developmental delay due to R3HDM1 haploinsufficiency.
  • R3HDM1 levels were reduced by approximately 50% in patient cells.
  • Knockdown of R3HDM1 suppressed dendritic growth and branching in mouse neurons.
  • MIR128-1 expression was unaffected by the pericentric inversion.

Conclusions:

  • Haploinsufficiency of R3HDM1 is implicated as a cause of mild ID and developmental delay.
  • The genetic imbalance between R3HDM1 and MIR128-1 may underlie the observed neurodevelopmental phenotype.
  • R3HDM1 plays a novel role in promoting dendritic growth, while miR-128 inhibits it, highlighting a critical regulatory balance.