Asb1-KO Mouse

Asb1, short for Ankyrin Repeat and SOCS Box Containing 1, is the substrate recognition subunit of a ubiquitin ligase. It is involved in ubiquitination processes, which play crucial roles in regulating protein stability and various cellular functions. Ubiquitination can target proteins for degradation, thus affecting multiple biological pathways. Asb1's functions are important in different biological contexts, and genetic models like knockout mice are valuable for studying its roles [2].

In prostate cancer, Asb1 expression is significantly decreased in cancer tissues, correlating with poor patient prognosis. Silencing Asb1 enhances prostate cancer cell proliferation, clonogenicity, and migration, while overexpression has the opposite effects. Asb1 interacts with CHCHD3, promoting its degradation via K48-linked ubiquitination, and inhibits prostate cancer cells through the CHCHD3/reactive oxygen species (ROS) pathway [1].

In male infertility, Asb1-knockout (Asb1-KO) mice exhibit severe fertility impairment, characterized by oligoasthenoteratozoospermia, excessive oxidative stress, decreased hydrogen sulfide (H2S) levels in testes, and severe sperm DNA damage. ASB1 interacts with ELOB to enhance the K48-linked ubiquitination of sulfide-quinone oxidoreductase (SQOR) on residues K207 and K344, triggering its proteasomal degradation, which is crucial for H2S homeostasis and redox balance [2].

In ischaemic cardiomyopathy, a hypermethylated profile in the Asb1 gene is related to left ventricular ejection fraction, stroke volume, and end-systolic and diastolic left ventricular diameters, and Asb1 shows down-regulation in messenger RNA levels [3].

In conclusion, Asb1 is essential in multiple biological processes. Through model-based research, it has been shown to act as a tumor suppressor in prostate cancer, play a vital role in spermiogenesis related to male infertility, and be associated with left ventricular performance in ischaemic cardiomyopathy. These findings from Asb1 KO mouse models contribute to understanding the underlying mechanisms in these disease areas.