The cell cycle is a fundamental process over which the cell grows and divides. This highly regulated series of events is known to be an important contributor to variations in protein and RNA expression between individual cells. Today we are releasing version 20.1 of the Human Protein Atlas (HPA), adding new data to the Cell Atlas, which allows detailed exploration of protein and RNA expression in relation to cell cycle progression...Read more

Some proteins are expressed periodically during a specific stage of the cell cycle or as a response to various stimuli. As a result, at any given time some cells express the protein of interest and some do not. In the Cell Atlas we denote these images as single-cell variation (SCV). An example of a protein with such variations is CCNB1.

CCNB1, shown here in U-251 MG cells, is essential for cellular proliferation. The abundance of CCNB1 oscillates across the cell cycle, and peaks during G2/M phase. CCNB1 is expressed in the cytoplasm during interphase and translocate to the nucleus during G2/M transition...Read more

Over the last couple of months, you have hade the pleasure to see Image of the week here on the blog, where an image we find particularly interesting has been shown and discussed. Now that our Cell Atlas is out, you can browse images of your favorite protein directly in our database! In addition to all the images we have added, there are also new "Human Cell" chapters, which provide a knowledge-based analysis of the human cellular proteomes and an entry into the Human Protein Atlas from different perspectives...Read more

It's time for another Image of the week! This week's image is brought to us by Diana Mahdessian, who works on the Subcellular protein atlas, and highlights cell division and various stages of mitosis. In previous blogs we have discussed the importance of certain proteins in the cell cycle including dividing centrosomes and FDXR in mitochondria.

The cell cycle is an ordered series of events that ultimately leads to the division of the "mother" cell into two "daughter" cells (cells are given feminine names because they are capable of reproducing).

The cell cycle consists of three distinct phases; interphase, mitosis and cytokinesis...Read more

This week HPA image of the week, I've decided to highlight two of my favorite things, the cell cycle and actin filaments!

The protein labeled in Fig 1. is an image of Cell division cycle 42 effector protein (Rho GTPase binding) 4 (CDC42EP4). In addition to being quite a mouthful, this protein resides in the cytoplasm and is associated with the actin filaments. In this image, CDC42EP4 is seen in U-2 OS human osteosarcoma cells.

As the name suggests, the CDC42EP4 is a protein associated with CDC42, which helps regulate the transition from G1 to S (in which DNA is replicated), and is essential for proper cell cycle progression (Yasuda S et al. 2006)...Read more