Histone H3 lysine 4 methyltransferase KMT2D

Area of Science:

• Epigenetics and Gene Regulation
• Molecular Biology
• Developmental Biology

Background:

• Histone-lysine N-methyltransferase 2D (KMT2D), also known as MLL4, is a key epigenetic regulator.
• KMT2D is essential for embryonic development and broadly expressed in adult tissues.
• It functions as a major H3K4 mono-methyltransferase and is involved in enhancer activation.

Purpose of the Study:

• To elucidate the multifaceted roles of KMT2D in gene expression and cellular processes.
• To understand the molecular mechanisms underlying KMT2D's function in development and disease.
• To explore the therapeutic potential related to KMT2D dysregulation.

Main Methods:

• Biochemical assays to determine methyltransferase activity.
• Co-immunoprecipitation to identify protein complex interactions.
• Analysis of KMT2D's role in enhancer function and gene expression during differentiation.

Main Results:

• KMT2D's SET domain is vital for its H3K4 methyltransferase activity and protein stability.
• KMT2D forms a complex with WRAD, NCOA6, PTIP, PA1, and UTX, stabilizing UTX.
• KMT2D is required for CBP/p300 binding to enhancers, driving cell-type specific gene expression.

Conclusions:

• KMT2D is a critical scaffold protein and H3K4 mono-methyltransferase essential for enhancer-driven gene expression.
• KMT2D mutations are linked to developmental disorders like Kabuki syndrome and various cancers.
• Further research into KMT2D function may yield novel therapeutic strategies for associated diseases.