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The Eukaryotic Promoter Region

The Eukaryotic Promoter Region

The eukaryotic promoter region is a segment of DNA located upstream of a gene. It contains an RNA polymerase binding site, a transcription start site, and several cis-regulatory sequences. The proximal promoter region is located in the vicinity of the gene and has cis-regulatory sequences and the core promoter. The core promoter is the binding site for RNA polymerase and is usually located between -35 and +35 nucleotides from the transcription start site. The distal promoter regions are...

The Eukaryotic Promoter Region

The Eukaryotic Promoter Region

Prokaryotic Transcriptional Activators and Repressors

Prokaryotic Transcriptional Activators and Repressors

The organization of prokaryotic genes in their genome is notably different from that of eukaryotes. Prokaryotic genes are organized, such that the genes for proteins involved in the same biochemical process or function are located together in groups. This group of genes, along with their regulatory elements, are collectively known as an operon. The functional genes in an operon are transcribed together to give a single strand of mRNA known as polycistronic mRNA.
Transcription of prokaryotic...

Prokaryotic Transcriptional Activators and Repressors

Prokaryotic Transcriptional Activators and Repressors

Reporter Genes

Reporter Genes

Reporter genes are a type of protein-coding gene that are often tagged to a gene of interest. Once inside a target cell, reporter genes usually produce visually identifiable characteristics like fluorescence and luminescence when expressed along with the gene of interest. Thus, reporter genes “report” the presence or absence of genes of interest in an organism, determine the gene expression pattern, or track the physical location of a DNA segment or protein in the cell.

Transcription in Prokaryotes

Transcription in Prokaryotes

Transcription is a highly regulated process that converts genetic information into RNA molecules. The transcription cycle is divided into three key stages: initiation, elongation, and termination, each driven by specific molecular mechanisms.Initiation of TranscriptionIn bacteria, transcription begins when the RNA polymerase core enzyme associates with a sigma factor to form a holoenzyme. For example, the E. coli sigma factor called σ70 forms a holoenzyme, which recognizes the -10 (Pribnow...

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Related Experiment Video

Updated: Jan 8, 2026

Methods to Discover Alternative Promoter Usage and Transcriptional Regulation of Murine Bcrp1

Methods to Discover Alternative Promoter Usage and Transcriptional Regulation of Murine Bcrp1

Published on: May 27, 2016

Human TMIGD1 Promoter Exhibits Robust Activity in Prokaryotic Cells.

Rosana Meyer¹, Kaneyoshi Yamamoto², Bridget Whelpley³

¹Department of Pathology, Boston University Chobanian & Avedisian School of Medicine, Boston, Massachusetts 02118, United States.

|December 24, 2025

Summary

A human gene promoter fragment successfully drove gene transcription in bacteria, challenging previous assumptions about cross-kingdom compatibility. This finding suggests conserved promoter features and enables novel hybrid regulatory systems.

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Area of Science:

Molecular Biology
Genetics
Synthetic Biology

Background:

Eukaryotic gene transcription involves complex regulatory elements and transcription factors, making eukaryotic promoters theoretically incompatible with bacterial systems.
Bacterial transcription machinery is streamlined, differing significantly from eukaryotic mechanisms.

Purpose of the Study:

To investigate the functional compatibility of eukaryotic promoters within a bacterial transcription system.
To determine if a human promoter fragment can drive gene expression in *Escherichia coli*.
To explore potential cross-kingdom conservation in promoter architecture.

Main Methods:

Utilized a minimal 90-bp fragment of the human TMIGD1 promoter.
Tested the promoter's functionality in *Escherichia coli* using reporter gene expression.
Compared reporter expression levels to established bacterial promoters.

Main Results:

The human TMIGD1 promoter fragment functioned as an active, constitutive promoter in *E. coli*.
Reproducible reporter expression was observed, comparable to moderate-strength bacterial promoters.
Demonstrated an unexpected convergence between human and bacterial transcriptional recognition.

Conclusions:

Human promoter sequences can be functional in bacterial systems, challenging domain-specific assumptions.
Fundamental features of promoter architecture may be conserved across different life domains.
Findings open avenues for designing hybrid gene regulatory systems with cross-kingdom transcriptional activity.