NSA2

NSA2 Full Name

NSA2 ribosome biogenesis homolog (S. cerevisiae)

NSA2 Introduction

NSA2 (Nop Seven-Associated 2), also known as TINP1 (TGF-β Inducible Nuclear Protein 1) in humans, is a highly conserved nucleolar protein essential for the synthesis of the ribosome. Evolutionarily preserved from yeast (S. cerevisiae) to mammals, NSA2 resides primarily in the nucleolus, the cellular factory for ribosome production. Its fundamental biological function is to orchestrate the maturation of the large ribosomal subunit (60S). NSA2 binds to the pre-60S ribosomal particles during the late nucleolar stages, facilitating the processing of 27S pre-rRNA into mature 28S and 5.8S rRNAs. Beyond its structural role in ribosome assembly, NSA2 functions as a crucial regulator of the cell cycle. It promotes the transition from the G1 phase to the S phase, thereby driving cellular proliferation and growth. It achieves this by modulating the expression of key cell cycle regulators, such as Cyclin D1 and CDK4, while suppressing cell cycle inhibitors like p21.

Figure 1. The schematic map of the NSA2 gene and cDNA structure. (Source: Zhang H, et al. 2010)

The clinical relevance of NSA2 is predominantly defined by its role as a potent oncogene in various human cancers. Because cancer cells require a high rate of protein synthesis to sustain rapid growth, they frequently hijack the ribosome biogenesis machinery, leading to the overexpression of factors like NSA2. Elevated levels of NSA2 have been identified in a wide spectrum of malignancies, including Hepatocellular Carcinoma (HCC), non-small cell lung cancer, colorectal cancer, and glioma. In these pathological contexts, NSA2 not only fuels uncontrolled proliferation but also promotes metastasis and angiogenesis (blood vessel formation). Consequently, high NSA2 expression is consistently correlated with advanced tumor stage, resistance to chemotherapy, and poor overall survival, identifying it as a valuable prognostic biomarker and a potential therapeutic target.

Alternate Names for NSA2

NSA2; NSA2 ribosome biogenesis homolog (S. cerevisiae); ribosome biogenesis protein NSA2 homolog; FLJ94393; hairy cell leukemia protein 1; HCLG1; HUSSY 29; TGF beta inducible nuclear protein 1; TINP1; TGF-beta inducible nuclear protein

• 1. Zhang H, et al. NSA2, a novel nucleolus protein regulates cell proliferation and cell cycle. Biochem Biophys Res Commun. 2010 Jan 1;391(1):651-8.
  2. Paternoga H, et al. Mutational Analysis of the Nsa2 N-Terminus Reveals Its Essential Role in Ribosomal 60S Subunit Assembly. Int J Mol Sci. 2020 Nov 30;21(23):9108.