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Objective:    Mutations in the high-temperature requirement A serine peptidase 1 ( HTRA1) gene were studied in a Chinese family with cerebral autosomal recessive arteriopathy with subcortical infarcts and leukoencephalopathy (CARASIL).Methods:    Exons 1–9 of the HTRA1 gene were amplified and bidirectionally sequenced in a Chinese family with CARASIL. Mutation effects were analysed by three-dimensional modelling of the serine protease HTRA1 protein.Results:    The proband was found to be homozygous for a novel missense mutation (c.854 C &gt; T) identified in exon 4 of the HTRA1 gene; the parents of the proband were heterozygous for the same missense mutation. This c.854 C &gt; T mutation resulted in a change from proline to leucine (p.P285L) in serine protease HTRA1, and was absent in 260 control chromosomes. Three-dimensional models showed that the change from proline to leucine (p.P285L) could attenuate the hydrogen bond between S284 and S287 residues, which might affect function of serine protease HTRA1.Conclusion:    Discovery of a novel missense mutation (c.854C&gt;T) associated with CARASIL expands the known CARASIL-related mutations in HTRA1.

journal of international medical research

A novel mutation of the high-temperature requirement A serine peptidase 1 (<i>HTRA1</i>) gene in a Chinese family with cerebral autosomal recessive arteriopathy with subcortical infarcts and leukoencephalopathy (CARASIL)

A novel mutation of the high-temperature requirement A serine peptidase 1 (HTRA1) gene in a Chinese family with cerebral autosomal recessive arteriopathy with subcortical infarcts and leukoencephalopathy (CARASIL)