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Cloning and functional characterization of the murine mastermind-like 1 (Maml1) gene

Lizi Wu1, Karla Kobayashi, Tao Sun

  • 1Department of Medical Oncology, Mayer 540, Dana-Farber Cancer Institute, Brigham and Women's Hospital and Harvard Medical School, 44 Binney Street, Boston, MA 02115, USA. lizi_wu@dfci.harvard.edu

Gene
|March 17, 2004
PubMed

Insights

The mouse Maml1 gene encodes a Notch signaling co-activator, homologous to human MAML1. This gene plays a role in neurogenesis, with expression correlating to Notch1 and Hes1 in the developing central nervous system.

Area of Science:

  • Molecular Biology
  • Developmental Biology
  • Genetics

Background:

  • Notch signaling pathway regulates cell fate during development and in disease.
  • Mastermind-like (MAML) proteins are essential transcriptional co-activators for Notch receptors.
  • Human MAML1, MAML2, and MAML3 are key components of this pathway.

Purpose of the Study:

  • To clone and characterize the murine homologue of human MAML1, named Maml1.
  • To investigate the function of Maml1 as a transcriptional co-activator in Notch signaling.
  • To analyze the genomic organization and regulatory elements of the Maml1 gene.
  • To examine the expression pattern of Maml1 during early mouse development.

Main Methods:

  • Gene cloning and sequence homology analysis.
  • Protein binding assays to study complex formation with Notch receptors, ICN, and CSL.
  • Reporter gene assays to measure transcriptional activation of target genes (e.g., HES-1).
  • Genomic DNA analysis to determine gene structure, size, and exon-intron organization.
  • Bioinformatic analysis of the 5' flanking region for transcription factor binding sites.
  • Quantitative analysis of Maml1 gene expression in developing mouse tissues via RT-PCR or similar techniques.

Main Results:

  • A murine cDNA homologous to human MAML1 was identified and named Maml1.
  • Maml1 encodes a nuclear protein that binds Notch receptors and enhances Notch-induced transcription of HES-1 by forming a ternary complex with ICN and CSL.
  • The mouse Maml1 gene spans at least 35 kb on chromosome 11, comprising five exons and four introns.
  • The Maml1 promoter is TATA-less and contains binding sites for transcription factors like Sp1, GR, ATF, and CREB.
  • Maml1 exhibits widespread but selective expression in various tissues during early mouse development.
  • Maml1 expression shows a temporal and spatial correlation with Notch1 and Hes1 in the developing central nervous system.

Conclusions:

  • Maml1 is the murine homologue of human MAML1 and functions as a transcriptional co-activator for Notch signaling.
  • The genomic structure and promoter elements of Maml1 suggest complex transcriptional regulation.
  • The expression pattern of Maml1, particularly in the CNS, suggests a significant role in neurogenesis and developmental processes regulated by Notch signaling.

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