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A very rare form of PCH with prenatal onset of polyhydramnios and contractures followed by hypertonia, severe clonus, primary hypoventilation leading to an early postnatal death. Has been reported in 10 families to date. Caused by a compound heterozygosity for p.A307S plus non-sense or splice site mutations in the TSEN54 gene. There is significant overlap both in phenotype and in genotype between pontocerebellar hypoplasia types 4 and 5. Inherited in an autosomal recessive manner.
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