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Target intelligence / Profile preview
Protamine 1 (PRM1)
- Target
- PRM1
- Molecular classification
- Other (sperm nuclear protein), Cancer-testis antigen, DNA-binding protein
01
Overview
Protamine 1 is a 49–51 amino acid arginine-rich nuclear protein expressed in sperm during spermatogenesis and essential for chromatin condensation and DNA packaging[1][4]. It replaces histones in mature sperm, enabling efficient transfer of the paternal genome and epigenetic information to the oocyte upon fertilization. Analysis reveals tissue-specific expression in testis, and aberrant expression of PRM1 is associated with certain cancers as a cancer-testis antigen. PRM1 serves as a critical biomarker for male infertility and is under investigation for its potential roles in cancer diagnostics and therapeutics[1][4][3]. PRM1 is not a receptor, enzyme, transporter, or ion channel, but a chromatin-associated DNA-binding protein functioning as part of the sperm-specific nuclear structure[1][4].
- Other names
- Sperm protamine P1PRM1CT94.1P1Cysteine-rich protaminecancer/testis antigen family 94 member 1testicular tissue protein Li 91testis specific protamine 1
02
Mechanism of action
Not applicable for direct drug targeting as of current knowledge; clinical use of protamine sulfate is principally for neutralizing anticoagulation.
03
Biological functions
Chromatin condensation in spermatogenesisDNA packaging in spermTransfer of paternal genetic and epigenetic information during fertilizationRegulation of chromatin integrity and sperm quality
04
Disease associations
Male infertility (defective expression or misregulation may impair sperm quality and function)Cancer (as a cancer-testis antigen, aberrantly expressed in some malignancies including chronic lymphocytic leukemia and colorectal cancer)
05
Safety considerations
Potential immune responses if used for immunotherapy (as CTA)Risks associated with inadequate chromatin condensation leading to sperm DNA instability and male infertility
06
Biomarkers
PRM1 expression and mutations are used as biomarkers for sperm quality and male infertility diagnosisAs a cancer-testis antigen, PRM1-specific IgG antibodies have been detected in some cancer patients, suggesting biomarker potential for tumor diagnosis and patient selection
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