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Speedy A, also known as SPDYA, SPDY1, Ringo3 or SPY1, is a 313 amino acid protein that localizes to the nucleus and belongs to the speedy/ringo family. Expressed at high levels in testis and at lower levels in brain, kidney, heart, bone marrow, colon, lung, liver spleen and placenta, Speedy A functions to regulate the G1/S phase transition of the cell cycle, specifically by binding to and activating Cdc2 p34, Cdk2 and p27. Additionally, Speedy A mediates cell survival during DNA damage, suggesting that Speedy A plays a role in proper cell cycle progression throughout the life of the cell. Multiple isoforms of Speedy A exist due to alternative splicing events. The gene encoding Speedy A maps to human chromosome 2, which encodes over 1,400 genes and comprises nearly 8% of the human genome.
4921517J08Rik; 4930548B21Rik; Gs4; hSpy/Ringo A; Lm23; MLZ-465; mSpy/Ringo A; protein expressed in male leptotene and zygotene spermatocytes 465; Rapid inducer of G2/M progression in oocytes A; RINGO A; RINGO3; RINGOA; SPDY1; SPDYA; spdya {ECO:0000250; speedy A; speedy A1; speedy A2; speedy homolog 1; speedy homolog A; speedy homolog A (Xenopus laevis); speedy protein A; speedy/ringo; speedy/RINGO cell cycle regulator family member A; Speedy-1; spermatogenesis related protein Gs4; spy1; UniProtKB:Q5MJ70}
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