Important gene discovery in debilitating muscle disease

An international collaboration of scientists, coordinated by the Harry Perkins Institute of Medical Research has discovered one of the genes which causes a muscle disease so severe that newborn babies rarely survive beyond a few days. Nigel Laing and Gina Ravenscroft

Perkins Laboratory for Molecular Genetics, headed by Professor Nigel Laing, which is globally recognised for its research into an inherited condition known as nemaline myopathy, coordinated the worldwide research effort that has led to the discovery of the gene KLHL40. The gene is now known to cause 20 per cent of the cases within a particularly severe version of the disease.

Researchers identified 19 mutations in KLHL40, which plays a major role in muscle development and function. Babies with the gene mutation had severe muscle weakness allowing little movement within the womb, as well as fractures, respiratory failure and swallowing difficulties at birth.

"I've wanted to find these genes since 1996, so it's a fantastic step forward," Professor Laing said. "Even 17 years ago we felt this disease was a different level of severity of nemaline myopathy so it was likely to be a different group of muscle proteins involved. After years of work, that has turned out to be the case.

"We've been contacted by doctors from around the world asking when they can use prenatal screening for prospective parents with a family history or symptoms during pregnancy.

"Now that this study has been published in The American Journal of Human Genetics, prenatal and pre-implantation testing can go ahead. It's a great result," Professor Laing said.

The international study was coordinated largely by the paper's lead author, Dr Gina Ravenscroft, who is based at Perkin's campus in Nedlands.

"Our research began with a Western Australian couple whose baby died after five days and a Turkish couple who tragically lost three babies in a row," she said.

"As our study expanded, researchers around the world studied DNA samples from families in countries including Japan, Vietnam, France, Turkey, Italy, Israel and Sweden.

"It's wonderful to make a discovery that will be of benefit to couples all over the world who unfortunately carry these terrible diseases," she said, "and we couldn't have done it without the DNA sequencing facility established here in WA. Our next generation sequencing technology allowed us to coordinate this huge study, involving 26 institutes around the world, from Perth, Western Australia."

Professor Laing said that mutations found in the gene were modelled in zebrafish both in Japan and at Monash University in Melbourne so researchers could learn more about the way the KLHL40 mutations affected muscle development and function.

"We're a very collaborative family of people around the world working in muscle diseases," he said. "Having pre-natal or pre-implantation screening for this particular gene will save parents of many nationalities a lot of heartache."

The Perkins team and collaborators are now working to find more of the genes responsible for this severe type of Nemaline Myopathy.

The paper, by 55 authors, published in The American Journal of Human Genetics is entitled "Mutations in KLHL40 are a frequent cause of severe autosomal recessive nemaline myopathy".

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