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Failure to thrive - an overlooked manifestation of KMT2B-related dystonia: a case presentation
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Failure to thrive - an overlooked manifestation of KMT2B-related dystonia: a case presentation
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Failure to thrive - an overlooked manifestation of KMT2B-related dystonia: a case presentation
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Journal Article
Failure to thrive - an overlooked manifestation of KMT2B-related dystonia: a case presentation
2020
Overview
Background
KMT2B
-related dystonia is a recently described form of childhood onset dystonia that may improve with deep brain stimulation. Prior reports have focused on neurologic features including prominent bulbar involvement without detailing general health consequences that may result from orolingual dysfunction. We describe a family with novel
KMT2B
mutation with several members with failure to thrive to highlight this non-neurologic, but consequential impact of mutation in this gene.
Case presentation
We present a case of a 15-year old female who was admitted and evaluated for failure to thrive. On exam, she had severe speech dysfluency, limited ability to protrude the tongue, and generalized dystonia involving the oromandibular region, right upper and left lower extremity with left foot inversion contracture. The proband and her parents underwent whole genome sequencing. A previously undescribed variant, c.4960 T > C (p.Cys1654Arg), was identified in the
KMT2B
gene in the proband and mother, and this variant was subsequently confirmed in two maternal cousins, one with failure to thrive. Literature review identified frequent reports of prominent bulbar involvement but failure to thrive is rarely mentioned.
Conclusion
Failure to thrive is a common pediatric clinical condition that has consequences for growth and development. In the presence of an abnormal neurologic exam, a search for a specific underlying genetic etiology should be pursued. With this case series, we highlight an unusual potentially treatable cause of failure to thrive, reinforce the importance of precise molecular diagnosis for patients with failure to thrive and an abnormal neurologic exam, and underscore the importance of cascade screening of family members.
