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Nuclear CaMKII Isoforms as Regulators of Transcription: From Developmental to Pathological Persistence

Areli Marlene Gaytán-Gómez1,2,3, Claudio Adrián Ramos-Cortés1,2,3, Ricardo Xopan Suarez-García1,2,3

  • 1Unidad de Remisión de Diabetes Mellitus (URDM), Facultad de Estudios Superiores-Iztacala, Universidad Nacional Autónoma de México, Tlalnepantla 54090, Mexico.

Medical Sciences (Basel, Switzerland)
|November 24, 2025
PubMed

Insights

Nuclear CaMKII isoforms regulate gene transcription in the heart and nervous system. Specific variants like CaMKIIδB, δ9, and γ control chromatin dynamics and transcription factors, impacting development and disease.

Area of Science:

  • Molecular Biology
  • Cellular Biology
  • Neuroscience

Background:

  • Calcium/calmodulin-dependent protein kinase II (CaMKII) exists in multiple isoforms with nuclear variants.
  • These nuclear variants play crucial roles in transcriptional control.
  • Specific isoforms like CaMKIIδB, δ9, and CaMKIIγ are implicated in cardiac and neural functions.

Purpose of the Study:

  • To review the current knowledge on nuclear CaMKII isoforms.
  • To emphasize established mechanistic pathways of nuclear CaMKII.
  • To identify unsolved questions regarding their roles in development and disease.

Main Methods:

  • Literature review synthesizing existing research on nuclear CaMKII.
  • Analysis of studies investigating CaMKII isoform localization and function.
  • Examination of evidence for CaMKII interactions with transcriptional regulators.

Main Results:

  • Nuclear CaMKII isoforms (e.g., CaMKIIδB, δ9, γ) regulate chromatin dynamics and transcription factor activity.
  • Nuclear import is mediated by splice-dependent nuclear localization sequences, modulated by phosphorylation.
  • CaMKII interacts with HDACs, MEF2, NF-κB, and HSF1, influencing gene expression programs.

Conclusions:

  • Nuclear CaMKII acts as an isoform-specific regulator of transcription.
  • Further validation of CaMKII substrates and direct evidence for its nuclear functions are needed.
  • Understanding nuclear CaMKII roles is critical for therapeutic targeting in development and disease.
Keywords:
alternative splicingcalcium-calmodulin-dependent protein kinase IIcell nucleusgene expression regulationgenetictranscription

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