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Germ cell nuclear acidic peptidase (GCNA)

Target: GCNA
Molecular classification: Enzyme (metalloprotease family, specifically minigluzincin-type protease domain), Intrinsically disordered protein (IDR-containing protein), Other (contains SUMO-interacting motifs and regions facilitating protein scaffolding)

Overview

GCNA is an evolutionarily conserved, germline-enriched protein characterized by a highly acidic, intrinsically disordered region and a protease-like SprT/minigluzincin domain. GCNA is essential for maintaining genome stability in germ cells, facilitating DNA repair, chromosome segregation, and cell cycle control, and preventing harmful DNA-protein crosslinks that would threaten fertility and propagational integrity. Homology with Wss1 and Spartan proteins places GCNA in a small family of IDR-containing metalloproteases specialized for cells with heritable genomes. Mutations in GCNA impair fertility and result in germ cell developmental defects and genomic instability, making it a key research marker for reproductive biology and germ cell cancer studies.

Other names: Germ cell nuclear acidic proteinACRCNAAR1Acidic repeat-containing proteinGerm cell nuclear antigenputative nuclear proteinSPGFX4

Biological functions

Genome stability and repair (limits DNA-protein crosslinks, prevents replication stress, and controls Spo11 activity in meiosis)Cell cycle regulationChromosome segregationGerm cell development and maintenanceProtection against genotoxic stress during reproduction

Disease associations

Germ cell tumors (as a putative tumor suppressor)Infertility (GCNA mutation causes sterility in animal models)Other (potential role in meiotic errors and reproductive disorders)

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