Structure and evolution of a human erythroid transcription factor

Area of Science:

• Molecular Biology
• Genetics
• Hematology

Background:

• Vertebrate erythroid cells utilize a tissue-specific transcription factor, known as Eryf 1, GF-1, or NF-E1.
• Binding sites for this factor are prevalent in regulatory regions of globin gene families and other erythroid-specific genes.
• Dysfunctional binding of the human factor to mutant sites is linked to hereditary persistence of fetal hemoglobin (HPFH).

Purpose of the Study:

• To report the cloning of the complementary DNA (cDNA) for the human Eryf 1 encoding gene.
• To compare the human Eryf 1 gene sequence with its chicken and mouse counterparts.

Main Methods:

• Cloning of the human Eryf 1 cDNA.
• Sequence analysis and comparison of human, chicken, and mouse Eryf 1 cDNA.

Main Results:

• The central third of the human Eryf 1 cDNA, containing two 'finger' motifs, shows high similarity to chicken and mouse versions.
• The amino- and carboxy-terminal regions of the human protein are similar to mouse but significantly different from chicken.
• Evolutionary analysis suggests Eryf 1 factors evolved from a common precursor with distinct domains that diverged at different rates.

Conclusions:

• The cloning of human Eryf 1 provides a key tool for studying erythroid gene regulation.
• Comparative analysis reveals conserved and divergent evolutionary paths for Eryf 1 in vertebrates.
• Understanding Eryf 1's structure and evolution offers insights into erythroid development and related disorders like HPFH.