Medical Research Council - London Institute of Medical Sciences

Now in our 9th year of bringing you beautiful imagery from biomedical science every day

Mending with Merlin
02 January 2017

Mending with Merlin

Lips curve up, skin crinkles around the eyes and there it is – a smile. The facial nerve coordinates the muscles behind this gleeful expression. Damage to this peripheral nerve can cause facial paralysis. Thankfully peripheral nerves usually heal with time. However people with neurofibromatosis type II (NFII) show slower and sometimes incomplete recovery from facial paralysis – a consequence of surgery to remove the facial tumours that characterise this disease. NFII is caused by mutations in the gene encoding merlin protein. Researchers therefore investigated whether merlin is important for repairing damaged peripheral nerves. In normal mice and mice lacking merlin in their peripheral nerves (pictured), damaged nerves (green) grew back and established contacts (red) with the appropriate muscles. However despite this, mice lacking merlin didn't regain full control of their muscles. For NFII patients, getting those smiles back after surgery may therefore be hampered by the presence of mutant merlin.

Written by Lux Fatimathas

Search The Archive

Submit An Image

What is BPoD?

BPoD stands for Biomedical Picture of the Day. Managed by the MRC London Institute of Medical Sciences the website aims to engage everyone, young and old, in the wonders of biomedicine. Images are kindly provided for inclusion on this website through the generosity of scientists across the globe.

Read More

BPoD is also available in Catalan at with translations by the University of Valencia.