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Cold-induced sweating syndrome type 1 (CISS1) is a rare disorder characterized by profuse sweating in a cold environment, determined by mutations in cytokine receptor–like factor 1 (CRLF1).1 Its pathogenesis is not fully understood. It has been demonstrated in vitro that CRLF1 may be involved in inducing differentiation from a noradrenergic to a cholinergic transmitter phenotype. During development, catecholaminergic and cholinergic neurotransmission is required for the induction of secretory function, whereas cholinergic transmission becomes crucial for the maintenance of the secretory responsiveness.2 The abnormal sweat response in CISS1 could be also related to alterations in temperature signals acting on hypothalamus and preoptic areas.1
We report clinical, molecular, skin biopsy, and temperature monitoring data of an Italian boy with CISS1.
Case report.
A 16-year-old boy had come to our observation at 1 year of age. His parents were healthy and unrelated. A brother, with facial dysmorphisms and hypotonia, had died at age 3 months from bronchopulmonary infection. Our patient was hypotonic at birth and experienced severe feeding difficulties. He had elongated face, high-arched palate, weak cry, large pinnae, short hands, tapering fingers, clinodactyly, and reduced tendon reflexes. Concentric needle EMG, nerve conduction velocity (NCV) studies (ulnar, median, peroneal, tibial, and sural nerves), and repetitive nerve stimulation testing excluded a …
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