Pulse Duration
Ontology highlight
ABSTRACT:
PROVIDER: PRJNA996965 | ENA |
REPOSITORIES: ENA
Dataset's files
| Action | DRS | |||
|---|---|---|---|---|
| SRR25405009_1.fastq.gz | Fastqsanger.gz | |||
| SRR25405009_2.fastq.gz | Fastqsanger.gz | |||
| SRR25405010_1.fastq.gz | Fastqsanger.gz | |||
| SRR25405010_2.fastq.gz | Fastqsanger.gz | |||
| SRR25405011_1.fastq.gz | Fastqsanger.gz |
Items per page: 5 1 - 5 of 36 |
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Project description:Reproduction requires pulsatile release of hypothalamic GnRH, which regulates expression of the pituitary gonadotropins FSH and luteinizing hormone (LH). Fshb expression shows an inverted U-shaped response to GnRH pulse frequency. Increasing GnRH pulse frequency beyond ~one pulse/2 hours, despite increasing the average GnRH concentration, induces progressively less Fshb. To clarify regulatory mechanisms underlying Fshb gene control, we developed three biologically inspired and topologically distinct mathematical models. The models represent: 1) parallel activation of Fshb inhibitory and stimulatory factors (e.g. inhibin α, VGF), 2) activation of a signaling component with a refractory period (e.g. G protein), and 3) inactivation of a factor needed for Fshb induction (e.g. GDF9). Simulations with all three models recapitulated the Fshb expression levels obtained in standard perifusion experiments at different GnRH pulse frequencies. Notably, simulations altering average concentration, pulse duration and frequency showed that the apparent frequency-dependent pattern of Fshb expression obtained with model 1 actually resulted from variations in average GnRH concentration. In contrast, models 2 and 3 showed “true” frequency sensing. To resolve which components of this GnRH signal induce Fshb, a massively parallel experimental system was developed. Analysis of over 4000 samples in ~40 experiments indicated that, while early genes Egr1 and Fos respond only to variations in GnRH concentration, Fshb induction is sensitive to GnRH pulse frequency changes, whilst maintaining the same average concentration. These results provide a framework for understanding the role of different regulatory factors in modulating the responses of the Fshb gene.
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Project description:Reproduction requires pulsatile release of hypothalamic GnRH, which regulates expression of the pituitary gonadotropins FSH and luteinizing hormone (LH). Fshb expression shows an inverted U-shaped response to GnRH pulse frequency. Increasing GnRH pulse frequency beyond ~one pulse/2 hours, despite increasing the average GnRH concentration, induces progressively less Fshb. To clarify regulatory mechanisms underlying Fshb gene control, we developed three biologically inspired and topologically distinct mathematical models. The models represent: 1) parallel activation of Fshb inhibitory and stimulatory factors (e.g. inhibin α, VGF), 2) activation of a signaling component with a refractory period (e.g. G protein), and 3) inactivation of a factor needed for Fshb induction (e.g. GDF9). Simulations with all three models recapitulated the Fshb expression levels obtained in standard perifusion experiments at different GnRH pulse frequencies. Notably, simulations altering average concentration, pulse duration and frequency showed that the apparent frequency-dependent pattern of Fshb expression obtained with model 1 actually resulted from variations in average GnRH concentration. In contrast, models 2 and 3 showed “true” frequency sensing. To resolve which components of this GnRH signal induce Fshb, a massively parallel experimental system was developed. Analysis of over 4000 samples in ~40 experiments indicated that, while early genes Egr1 and Fos respond only to variations in GnRH concentration, Fshb induction is sensitive to GnRH pulse frequency changes, whilst maintaining the same average concentration. These results provide a framework for understanding the role of different regulatory factors in modulating the responses of the Fshb gene.
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