Transcription factor gene Pea3 regulates erectile function during copulation in mice

Area of Science:

• Neuroscience
• Genetics
• Reproductive Biology

Background:

• Male infertility can stem from complex behavioral deficits.
• The role of specific transcription factors, like Pea3, in male sexual function is not fully understood.

Purpose of the Study:

• To investigate the specific sexual behavior deficits in male mice with homozygous loss-of-function mutations in the transcription factor gene Pea3 (Pea3 null).
• To determine the impact of Pea3 gene mutation on erectile function, intromission, and copulatory behaviors.

Main Methods:

• High-speed and high-resolution digital videography was used to monitor copulatory behavior in Pea3 null and control male mice.
• Assessment included female-directed social behaviors, mounting, thrusting, and erectile/ejaculatory function.

Main Results:

• Pea3 null male mice exhibited significantly reduced erectile function, with a high percentage unable to achieve or sustain erections.
• These deficits resulted in an inability to achieve intromission and copulatory plug deposition.
• While social and mounting behaviors were largely normal, thrusting behavior organization and timing were impaired.

Conclusions:

• The transcription factor gene Pea3 is crucial for regulating the ability to achieve and maintain penile erections during copulation in male mice.
• Deficits in erectile function due to Pea3 loss-of-function directly cause infertility in these mice.
• Pea3 plays a specific role in the neural control of erectile function essential for male reproductive success.