A New Splicing Mutation in the L1CAM Gene Responsible for X-Linked Hydrocephalus (HSAS).

Abstract

X-linked hydrocephalus (XLH) is a genetic disorder leading to a syndrome characterized by mental retardation, bilateral adducted thumbs, and spasticity of upper and lower limbs. In most cases, X-linked mutation leads to a defective activity of the neuronal cell adhesion molecule L1CAM (L1 cell adhesion molecule, OMIM 308840). Depending on mutations of L1CAM, four X-linked neurological syndromes have been described. These syndromes are very different albeit each one possesses marked variability. In the present study, we describe a novel L1CAM mutation in a 33-year-old woman reporting two voluntary terminations of pregnancy due to fetal hydrocephalus. The genetic analysis identified the potential splicing variant c.1267+5delG. When analyzed in vitro, this mutation produces the skipping of exon 10. The same mutation was confirmed in analyzing DNA from amniocytes from the second pregnancy, and ultrasound scan and autopsy confirmed the occurrence of a severe L1 syndrome. These data describe a novel L1 mutation which improves our understanding on genotype-phenotype correlation while confirming the importance of prenatal screening for L1CAM mutations.

• Authors: Rosangela Ferese, Stefania Zampatti, Anna Maria Pia Griguoli, Francesco Fornai, Emiliano Giardina, Giuseppe Barrano, Veronica Albano, Rosa Campopiano, Simona Scala, Giuseppe Novelli, Stefano Gambardella
• Journal: Journal of molecular neuroscience : MN (J Mol Neurosci) Vol. 59 Issue 3 Pg. 376-81 (Jul 2016) ISSN: 1559-1166 [Electronic] United States
• PMID: 27207492 (Publication Type: Journal Article)

Chemical References

• Neural Cell Adhesion Molecule L1

Topics

• Adult
• Exons
• Female
• Genetic Diseases, X-Linked (genetics, pathology)
• HEK293 Cells
• Humans
• Hydrocephalus (genetics, pathology)
• Male
• Mutation
• Neural Cell Adhesion Molecule L1 (genetics)
• Pedigree
• Pregnancy
• Prenatal Diagnosis
• RNA Splicing