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Updated: Dec 30, 2025
An Integrated Approach for Microprotein Identification and Sequence Analysis
Published on: July 12, 2022
cDNA cloning and characterization of a novel gene encoding the MLF1-interacting protein MLF1IP
Silva H Hanissian1, Umar Akbar, Bin Teng
1Department of Neurosurgery, The University of Tennessee Health Science Center, 847 Monroe, Room 427, Memphis, TN 38163, USA. shanissi@utmem.edu
Abstract:
Myelodysplasia/acute myeloid leukemia (MDS/AML) is characterized by a t(3;5)(q25.1;q34) chromosomal translocation that forms a fusion gene between nucleophosmin (NPM) and MDS/myeloid leukemia factor 1 (MLF1). We identified a novel protein, MLF1-interacting protein (MLF1IP), that specifically associates with MLF1 by yeast two-hybrid analysis and in pulldown assays, and colocalizes with it in both the nuclei and cytoplasm of cells. The MLF1IP gene locus is at chromosome 4q35.1 and is composed of 14 exons spanning 75.8 kb of genomic DNA. The MLF1IP cDNA encodes a 46-kDa protein that contains two bipartite and two classical nuclear localization signals, two nuclear receptor-binding motifs (LXXLL), two leucine zippers, two PEST residues and several potential phosphorylation sites. MLF1IP transcripts are expressed in a variety of tissues (e.g. fetal liver, bone marrow, thymus and testis). MLF1IP appears to be a lineage-specific gene whose expression is confined exclusively to the CFU-E erythroid precursor cells, but not in mature erythrocytes. These observations, together with previous data demonstrating a role for MLF1 in suppressing red cell maturation, suggest a possible role for MLF1IP and MLF1 deregulation in the genesis of erythroleukemias.
Insights
A novel protein, MLF1-interacting protein (MLF1IP), interacts with MLF1. MLF1IP is expressed in erythroid precursor cells, suggesting a role in erythroleukemia development.
Area of Science:
- Molecular Biology
- Hematology
- Genetics
Background:
- Myelodysplasia/acute myeloid leukemia (MDS/AML) involves a t(3;5) translocation creating an NPM-MLF1 fusion gene.
- The role of MLF1 in suppressing red blood cell maturation is established.
Purpose of the Study:
- To identify and characterize a novel protein interacting with MLF1.
- To investigate the role of this novel protein in erythroid development and potential links to erythroleukemia.
Main Methods:
- Yeast two-hybrid analysis and pulldown assays to identify protein interactions.
- Gene locus mapping and cDNA analysis to characterize the novel protein.
- Transcript expression analysis in various tissues and cell types.
Main Results:
- A novel protein, MLF1-interacting protein (MLF1IP), was identified and shown to associate with MLF1.
- MLF1IP colocalizes with MLF1 in cellular nuclei and cytoplasm.
- MLF1IP gene is located at 4q35.1 and encodes a 46-kDa protein with multiple functional domains.
- MLF1IP transcripts are expressed in fetal liver, bone marrow, thymus, and testis, specifically in CFU-E erythroid precursor cells.
Conclusions:
- MLF1IP specifically associates with MLF1.
- MLF1IP is expressed in erythroid precursor cells, suggesting a lineage-specific role.
- Deregulation of MLF1IP and MLF1 may contribute to the development of erythroleukemias.
