G2Cdb::Allele report

Mutation type

Altered genes (1)

Gene Symbol Species Description
G00001881 L1CAM Homo sapiens L1 cell adhesion molecule

Diseases (1)

Disease Description Nervous effect
D00000271 Nephrogenic diabetes insipidus N

Literature (1)

Pubmed - human_disease

  • Contiguous gene deletion involving L1CAM and AVPR2 causes X-linked hydrocephalus with nephrogenic diabetes insipidus.

    Tegay DH, Lane AH, Roohi J and Hatchwell E

    Stony Brook University Hospital, Stony Brook, New York, USA. david.tegay@stonybrook.edu

    X-linked hydrocephalus with aqueductal stenosis (HSAS) is caused by mutation or deletion of the L1 cell adhesion molecule gene (L1CAM) at Xq28. Central diabetes insipidus (CDI) can arise as a consequence of resultant hypothalamic dysfunction from hydrocephalus and must be distinguished from nephrogenic diabetes insipidus (NDI) by exogenous vasopressin response. Causes of NDI are heterogeneous and include mutation or deletion of the arginine vasopressin receptor 2 gene (AVPR2), which is located approximately 29 kb telomeric to L1CAM. We identified a patient with both HSAS and NDI where DNA sequencing failure suggested the possibility of a contiguous gene deletion. A 32.7 kb deletion mapping from L1CAM intron1 to AVPR2 exon2 was confirmed. A 90 bp junctional insertion fragment sharing short direct repeat homology with flanking sequences was identified. To our knowledge this is the first reported case of an Xq28 microdeletion involving both L1CAM and AVPR2, defining a new contiguous gene syndrome comprised of HSAS and NDI. Contiguous gene deletion should be considered as a mechanism for all patients presenting with hydrocephalus and NDI.

    Funded by: NIGMS NIH HHS: T32 GM008444

    American journal of medical genetics. Part A 2007;143A;6;594-8

© G2C 2014. The Genes to Cognition Programme received funding from The Wellcome Trust and the EU FP7 Framework Programmes:
EUROSPIN (FP7-HEALTH-241498), SynSys (FP7-HEALTH-242167) and GENCODYS (FP7-HEALTH-241995).

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