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Network and gene tools help quickly identify new, rare genetic disease

Date:
September 29, 2016
Source:
Duke Health
Summary:
A new genetic disorder, which still has no name, has been identified using a national network and gene mapping tools. It shares similarities to two other rare genetic disorders arising from related genes, say researchers.
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FULL STORY

The first patient was a mystery.

Arriving at Duke six years ago at the age of three, the youngster had mild developmental delays and physical characteristics that included a large body and large head circumference. A genetic analysis showed mutation of a specific gene, known as ASXL2, which had never been singled out as causing disease.

The youngster's doctor, Vandana Shashi, a professor of pediatrics for the Division of Medical Genetics at Duke University School of Medicine, told his parents their son likely had a rare and yet-unidentified disease. And she promised to remain vigilant if any other cases popped up in the medical literature that might provide additional clues.

After none turned up, Shashi set out to see if the mystery case might be solved, instead, using the tools of the Undiagnosed Diseases Network (UDN) at the National Institutes of Health, which links Duke and six other medical teaching sites around the country. The participating centers pool information and innovations about diseases that are so rare they often stump the broader medical community.

Within just six weeks -- connected to other UDN research labs and an international database of genes and disease characteristics called GeneMatcher -- Shashi had a remarkable trove: Five additional children, all with the same physical features and the ASXL2 gene mutation.

"We can now definitively say this is a newly identified disease," Shashi said. "With just one case, we could not say the gene mutation was the underlying cause. But with six cases, all with the same ASXL2 mutation, it is definitive."

Shashi and colleagues from other UDN institutions published their findings online Sept. 29 in the American Journal of Human Genetics.

The new disease, which still has no name, does have similarities to two other rare genetic disorders arising from related genes. A condition called Bohring-Opitz syndrome is the result of a mutation of the ASXL1 gene, while Bainbridge-Ropers syndrome is caused by a flaw in the ASXL3 gene. Both conditions are also rare, and result in similar, but more severe impairments.

It's unknown how the ASXL2 genetic mutation arises, but Shashi said identifying the root cause of the children's condition is a first step, and could help drive new therapies and treatment approaches.

The immediate benefit is to the families of the children, who now have an answer to their most basic question.

"It has been wonderful to be connected to other families who share this genetic condition," said Teresa Locklear, whose son, Issac, was the first patient to present with the mutation at Duke. "When we started, we hoped we would find other families with children who were older than Isaac, to provide a sort of roadmap for what to expect. But it turns out, Isaac is the oldest and we are the ones sharing our experiences with parents of younger children, and that's been so rewarding."

Study co-author Loren del Mar Peña, assistant professor in the Department of Pediatrics at Duke, said reducing isolation for families with a rare disease has tremendous impact.

"These families feel truly alone when their child clearly has a disorder, and yet there is no name for it, and no community of people they can relate to with shared experiences," Peña said. "This will help them be able to connect with others and compare notes. That's a huge deal -- to know you aren't the only one and there a five other children out there."


Story Source:

Materials provided by Duke Health. Note: Content may be edited for style and length.


Journal Reference:

  1. Vandana Shashi et al. De Novo Truncating Variants in ASXL2 Are Associated with a Unique and Recognizable Clinical Phenotype. American Journal of Human Genetics, September 2016 DOI: 10.1016/j.ajhg.2016.08.017

Cite This Page:

Duke Health. "Network and gene tools help quickly identify new, rare genetic disease." ScienceDaily. ScienceDaily, 29 September 2016. <www.sciencedaily.com/releases/2016/09/160929133616.htm>.
Duke Health. (2016, September 29). Network and gene tools help quickly identify new, rare genetic disease. ScienceDaily. Retrieved May 25, 2017 from www.sciencedaily.com/releases/2016/09/160929133616.htm
Duke Health. "Network and gene tools help quickly identify new, rare genetic disease." ScienceDaily. www.sciencedaily.com/releases/2016/09/160929133616.htm (accessed May 25, 2017).

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