Human selenoproteins at a glance.

Area of Science:

• Biochemistry and Molecular Biology
• Nutritional Science
• Human Physiology

Background:

• Public perception of selenium has shifted from toxicity to essentiality, with growing interest in its therapeutic potential.
• Selenium supplementation is explored for various clinical conditions, yet its mechanisms of action remain largely unclear.
• Selenocysteine, the 21st amino acid, is integral to human selenoprotein synthesis.

Purpose of the Study:

• To provide an updated overview of the 25 identified human selenoproteins.
• To elucidate the synthesis pathways of these selenoproteins.
• To explore the potential role of selenoprotein restoration in selenium's biological effects.

Main Methods:

• Literature review of current research on human selenoproteins and selenium metabolism.
• Analysis of genetic and biochemical data related to selenoprotein identification and function.
• Synthesis of information regarding the incorporation of selenocysteine in protein synthesis.

Main Results:

• Identification of at least 25 specific human selenoproteins, many recently discovered.
• Understanding the role of selenocysteine as the 21st amino acid in protein synthesis.
• Highlighting the unresolved mechanisms underlying selenium's effects in various conditions.

Conclusions:

• Restoring normal selenoprotein levels is a potential mechanism for selenium's beneficial effects, beyond direct supranutritional actions.
• Further research is needed to fully understand the functions and regulation of human selenoproteins.
• This review synthesizes current knowledge on selenoproteins, aiding future investigations into selenium's role in health and disease.