Metachromatic Leukodystrophy: Parents call for heel prick testing after death of son

Metachromatic Leukodystrophy: Parents call for heel prick testing after death of son

The parents of Teddy Johnson, a seven-year-old boy from Portadown who passed away from Metachromatic Leukodystrophy (MLD), a rare degenerative metabolic disorder, are campaigning for the introduction of newborn screening that might have saved his life. Teddy’s mother, Jemma, revealed that her son was diagnosed at 18 months old, by which point treatment options were no longer viable because symptoms were already evident. MLD is a condition that leads to a progressive decline in both physical and cognitive abilities and affects roughly one in 40,000 births. Although early detection through heel prick testing could allow for treatment, the UK government has stated that decisions must be based on scientific evidence.

Jemma described Teddy’s early development as normal and healthy; he met all his milestones and was walking by 11 months. However, when he was about 17 months old, he started to walk with a limp, which worsened over the course of a month without improvement. Initially, she and her husband Marvin did not become alarmed, but after consulting a neurologist and obtaining the diagnosis of MLD, their world “fell apart.” Tragically, Teddy was expected not to survive past the age of four. Over the following year, his condition deteriorated severely, leaving him unable to move or communicate, with pain and rigidity, and requiring feeding via a tube.

The loss of Teddy’s ability to talk was especially hard for his parents. Jemma expressed the heartbreak of no longer hearing him call for his parents or sister. The couple gave up their careers to care for Teddy full-time, fearing a rapid decline. They protected him during the COVID-19 pandemic and described how their entire lives revolved around his care for six years. Reflecting on their loss, Jemma said, “Teddy has left a massive void in our lives.” Despite Teddy’s death in April, his parents remain determined to prevent similar tragedies by advocating for adding MLD to the newborn heel prick screening program.

Earlier this year, the UK National Screening Committee (NSC) decided not to include MLD in the list of conditions screened at birth, citing insufficient evidence on the accuracy of screening tests and unclear long-term benefits of early treatment. Nonetheless, the Johnsons have taken their fight to Westminster, where they are meeting health officials, including the Parliamentary Under-Secretary for Public Health and Prevention, Sharon Hodgson. Marvin emphasized that Teddy’s early death could have been averted if the illness had been detected through newborn screening. Their aim is to educate policymakers and push for change, stating, “Children are dying because of it.”

The campaign has gained political support, with DUP MP Carla Lockhart urging the prime minister to reconsider early testing. She highlighted the low additional cost of around 17 pence per child to add MLD to the heel prick test, stressing that effective treatment is available if diagnosis occurs before symptoms begin. Professor Simon Jones, an expert in inherited metabolic diseases, pointed out that a gene therapy treatment was approved in the UK in 2022 and can be nearly curative if administered early. However, it is complex and must be started before illness onset, which contrasts with standard medical practice. Since the drug’s approval, only a fraction of diagnosed children have received treatment, with many, like Teddy, lacking access and sent home “to die,” a situation Professor Jones described as unacceptable. The Department for Health and Social Care expressed sympathy for the family and noted that the NSC is reviewing MLD for further evaluation to gather more evidence on routine newborn screening

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