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Selection of Transgenic Mice：TH-cre or BDH-cre ?

Release time：2026-04-16 16:32:19

Many researchers working on neural circuits, optogenetics, and chemogenetics often face a crucial question: What is the difference between TH-Cre mice and DBH-Cre mice? How should one choose?

First, let's understand the basic concepts:

Catecholamines are a group of biologically active substances containing both a catechol group and an amine group. They mainly include norepinephrine, epinephrine, and dopamine. These substances are synthesized and secreted in the brain, sympathetic nervous system, and adrenal medulla, playing key physiological roles in processes such as emotion, movement, reward, stress, and blood pressure regulation. Based on the neurotransmitter involved, neurons can be classified into three categories:

1. Dopaminergic neurons (DA): These use dopamine as the neurotransmitter. They are widely distributed in the mammalian brain, with the highest concentrations found in the caudate nucleus and putamen, and also enriched in areas like the substantia nigra and globus pallidus. They are closely related to motor control, reward, and motivation.

2. Noradrenergic neurons (NE/NA): These use norepinephrine as the neurotransmitter. Their cell bodies are mainly located in the lower brainstem, especially in the locus coeruleus and ventrolateral medulla. Their fibers project widely across the brain, contributing to arousal, stress, anxiety, and pain regulation.

3. Adrenergic neurons (AD): These use epinephrine as the neurotransmitter, with cell bodies primarily located in the medulla. They also have both ascending and descending projection pathways, involved in autonomic nervous system and cardiovascular regulation.

The core difference between DBH-Cre and TH-Cre mice is: TH-Cre labels all catecholaminergic neurons (dopaminergic + noradrenergic), whereas DBH-Cre specifically labels only noradrenergic/adrenergic neurons and does not label dopaminergic neurons.

I. Core Molecules and Expression Range (The Key Difference)

1. TH-Cre (Tyrosine Hydroxylase-Cre)

Driver gene: Tyrosine Hydroxylase (TH), the rate-limiting enzyme in catecholamine synthesis.

Expressed in: All catecholaminergic neurons

🔹Central: Dopaminergic (VTA, SNc in the midbrain), noradrenergic (locus coeruleus (LC), thalamus, olfactory bulb, etc.)
🔹Peripheral: Adrenal medulla, sympathetic ganglia, etc.

Function: Labels the full spectrum of dopaminergic + noradrenergic neurons, with negligible adrenergic labeling in the central nervous system.

Figure 1: TH-Cre Positive Regions

2. DBH-Cre (Dopamine β-Hydroxylase-Cre)

Driver gene: Dopamine β-Hydroxylase (DBH), the key enzyme converting dopamine to norepinephrine.

Expressed in: Only noradrenergic/adrenergic neurons

🔹Central: Locus coeruleus, brainstem noradrenergic nuclei

🔹Peripheral: Sympathetic ganglia, adrenal medulla (adrenergic)

🔹Not expressed in: Dopaminergic neurons (e.g., VTA, SNc).

Function: Specifically labels the noradrenergic system, completely excluding dopaminergic neurons.

Figure 2: DBH-Cre Positive Regions

II. Comparison of Expression Sites (Central + Peripheral)

III. Construction Methods (Common Strains)

🔹TH-Cre: Typically Th-IRES-Cre knock-in, where Cre is expressed under the control of the endogenous TH promoter, covering all catecholaminergic neurons.
🔹DBH-Cre: Typically Dbh-IRES-Cre knock-in or bacterial artificial chromosome (BAC) transgenic, where Cre strictly follows the DBH expression profile, labeling only noradrenergic/adrenergic neurons.

IV. Research Application Scenarios

1. Choosing TH-Cre

🔹Study the combined regulation of dopaminergic + noradrenergic systems (e.g., emotion, reward, movement).

🔹Models for Parkinson's disease (dopaminergic in SNc), depression (LC + VTA), addiction, etc.

🔹Requires simultaneous manipulation of both types of catecholaminergic neurons.

2. Choosing DBH-Cre

🔹Specific study of the noradrenergic system (eliminating dopaminergic interference).

🔹Function of the locus coeruleus (LC), stress, autonomic nervous regulation, peripheral sympathetic nervous system.

🔹Norepinephrine-related diseases (e.g., hypertension, anxiety, pain regulation).

V. Summary

🔹TH-Cre = Pan-catecholaminergic (dopaminergic + noradrenergic)
🔹DBH-Cre = Noradrenergic/adrenergic only (non-dopaminergic)

References

1.Savitt JM, Jang SS, Mu W, Dawson VL, Dawson TM. Bcl-x is required for proper development of the mouse substantia nigra. J Neurosci. 2005;25(29):6721-6728.
2. Tillage RP, Sciolino NR, Plummer NW, et al. Elimination of galanin synthesis in noradrenergic neurons reduces galanin in select brain areas and promotes active coping behaviors. Brain Struct Funct. 2020;225(2):785-803.
3. Runegaard AH, Jensen KL, Fitzpatrick CM, et al. Preserved dopaminergic homeostasis and dopamine-related behaviour in hemizygous TH-Cre mice. Eur J Neurosci. 2017;45(1):121-128.
4. Stuber GD, Stamatakis AM, Kantak PA. Considerations when using cre-driver rodent lines for studying ventral tegmental area circuitry. Neuron. 2015;85(2):439-445.
5. Lammel S, Steinberg EE, Földy C, et al. Diversity of transgenic mouse models for selective targeting of midbrain dopamine neurons. Neuron. 2015;85(2):429-438.

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Selection of Transgenic Mice：TH-cre or BDH-cre ?

I. Core Molecules and Expression Range (The Key Difference)

1. TH-Cre (Tyrosine Hydroxylase-Cre)

2. DBH-Cre (Dopamine β-Hydroxylase-Cre)

II. Comparison of Expression Sites (Central + Peripheral)

III. Construction Methods (Common Strains)

IV. Research Application Scenarios

V. Summary

References

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Selection of Transgenic Mice：TH-cre or BDH-cre ?

I. Core Molecules and Expression Range (The Key Difference)

1. TH-Cre (Tyrosine Hydroxylase-Cre)

2. DBH-Cre (Dopamine β-Hydroxylase-Cre)

II. Comparison of Expression Sites (Central + Peripheral)

III. Construction Methods (Common Strains)

IV. Research Application Scenarios

V. Summary

References

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