SYCP2

SYCP2, or synaptonemal complex protein 2, is a protein encoded by the SYCP2 gene in humans. It is a meiosis-specific component of the synaptonemal complex, a protein structure that forms between homologous chromosomes during prophase I of meiosis and promotes pairing, synapsis, and recombination.

During meiotic prophase I, SYCP2 localizes to the chromosome axes and contributes to the assembly of the lateral elements of the synaptonemal complex, working together with SYCP3 to form the core scaffold that stabilizes homolog alignment. Its function is closely tied to the proper progression of meiosis and the integrity of recombination events.

Expression of SYCP2 is largely restricted to germ cells, with the highest levels observed in testicular tissue and detectable expression in ovarian tissue as part of germ cell development.

Genetic disruption or altered expression of SYCP2 in model organisms leads to defects in synapsis and meiotic progression, often causing meiotic arrest and infertility, illustrating its essential role in meiosis. In humans, rare variants in SYCP2 have been proposed as possible contributors to infertility or aneuploidy risk in some cases, though the clinical significance of specific variants remains under study.

Structural features of the protein include coiled-coil regions typical of meiotic structural proteins, enabling dimerization and interactions with other synaptonemal complex components. In addition to SYCP3, SYCP2 may interact with other SC proteins to facilitate proper assembly and stabilization of the synaptonemal complex.