ScienceDaily (May 27, 2012) UCLA geneticists have identified the mutation responsible for IMAGe syndrome, a rare disorder that stunts infants' growth. The twist? The mutation occurs on the same gene that causes Beckwith-Wiedemann syndrome, which makes cells grow too fast, leading to very large children.
Published in the May 27 edition of Nature Genetics, the UCLA findings could lead to new ways of blocking the rapid cell division that allows tumors to grow unchecked. The discovery also offers a new tool for diagnosing children with IMAGe syndrome, which until now has been difficult to accurately identify.
The discovery holds special significance for principal investigator Dr. Eric Vilain, a professor of human genetics, pediatrics and urology at the David Geffen School of Medicine at UCLA.
Nearly 20 years ago, as a medical resident in his native France, Vilain cared for two boys, ages 3 and 6, who were dramatically short for their ages. Though unrelated, both children shared a mysterious malady marked by minimal fetal development, stunted bone growth, sluggish adrenal glands, and undersized organs and genitals.
"I never found a reason to explain these patients' unusual set of symptoms," explained Vilain, who is also director of the UCLA Institute for Society and Genetics. "I've been searching for the cause of their disease since 1993."
When Vilain joined UCLA as a genetics fellow, the two cases continued to intrigue him. His mentor, then UCLA geneticist Dr. Edward McCabe, recalled a similar case from his previous post at Baylor College of Medicine. The two of them obtained blood samples from the three cases and analyzed the patients' DNA for mutations in suspect genes, but uncovered nothing.
Vilain and McCabe approached the Journal of Clinical Endocrinology and Metabolism, and in 1999 published the first description of the syndrome, which they dubbed IMAGe, an acronym of sorts for the condition's symptoms: intrauterine growth restriction, metaphyseal dysplasia, adrenal hypoplasia and genital anomalies.
Over the next decade, about 20 cases were reported around the world. But the cause of IMAGe syndrome remained a mystery.
Help arrived unexpectedly last year when Vilain received an email from Argentinian physician Dr. Ignacio Bergada, who had unearthed the 1999 journal article. He told Vilain about a large family he was treating in which eight members suffered the same symptoms described in the study. All of the family members agreed to send their DNA samples to UCLA for study.
Vilain realized that he had stumbled across the scientific equivalent of winning the lottery. He assembled a team of UCLA researchers to partner with Bergada and London endocrinologist Dr. John Achermann.
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Disease that stunts infants' growth traced to same gene that makes kids grow too fast
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