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MLL5 (KMT2E): structure, function, and clinical relevance.

Xiaoming Zhang1, Wisna Novera1, Yan Zhang2

  • 1Department of Biochemistry, Yong Loo Lin School of Medicine, National University Health System, National University of Singapore, 8 Medical Drive, MD 7 #04-06, Singapore, 117597, Singapore.

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Summary
This summary is machine-generated.

Mixed Lineage Leukemia 5 (MLL5/KMT2E) is distinct from other MLL proteins and may lack histone methyltransferase activity. This review explores MLL5

Keywords:
CancerCell divisionHematopoietic stem cell differentiationHistone methylationLeukemiaPHD finger

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Area of Science:

  • Molecular Biology
  • Genetics
  • Developmental Biology

Background:

  • The Mixed Lineage Leukemia (MLL) gene family, also known as Lysine N-methyltransferase 2 (KMT2) family, are crucial for HOX gene regulation and embryonic development.
  • MLL5 (KMT2E) shares SET domain homology with other MLL proteins but exhibits distinct characteristics, notably lacking apparent intrinsic histone methyltransferase (HMT) activity.
  • Despite its categorization within the MLL family, emerging evidence highlights MLL5's unique role in various biological processes.

Purpose of the Study:

  • To review recent research on the structural features and biological roles of MLL5 (KMT2E).
  • To elucidate the distinct mechanisms and functions of MLL5 compared to other MLL family members.
  • To highlight the potential involvement of MLL5 dysfunction in human diseases.

Main Methods:

  • Literature review of recent studies on MLL5 structure, function, and variants.
  • Analysis of comparative genomics for MLL5 homologs.
  • Synthesis of findings on MLL5's role in cell cycle, genomic stability, hematopoiesis, and spermatogenesis.

Main Results:

  • MLL5 (KMT2E) is structurally and functionally distinct from other KMT2 family members.
  • MLL5 plays significant roles in cell cycle progression, genomic stability, hematopoiesis, and spermatogenesis.
  • Recent studies reveal diverse MLL5 isoforms and homologs, expanding understanding of its gene regulatory functions.

Conclusions:

  • MLL5 (KMT2E) represents a unique member of the KMT2 gene family with functions beyond canonical histone methylation.
  • Further research is needed to fully understand MLL5's mechanism of action and physiological significance.
  • MLL5 dysfunction presents potential implications for various human diseases, warranting further investigation.