Disruption of scribble (Scrb1) causes severe neural tube defects in the circletail mouse.

Abstract:

:Circletail is one of only two mouse mutants that exhibit the most severe form of neural tube defect (NTD), termed craniorachischisis. In this disorder, almost the entire brain and spinal cord is affected, owing to a failure to initiate neural tube closure. Craniorachischisis is a significant cause of lethality in humans, yet the molecular mechanisms involved remain poorly understood. Here, we report the identification of the gene mutated in circletail (Crc), using a positional cloning approach. This gene, Scrb1, encodes a member of the LAP protein family related to Drosophila scribble, with 16 leucine rich repeats and four PDZ domains. The Crc mutant contains a single base insertion that creates a frame shift and leads to premature termination of the Scrb1 protein. We report the expression pattern of Scrb1 during embryonic and fetal development, and show that Scrb1 expression closely mirrors the phenotypic defects observed in Crc/Crc mutants. In addition, circletail genetically interacts with the loop-tail mutant, and we reveal overlapping expression of Scrb1 with Vangl2, the gene mutated in loop-tail. The identification of the Crc gene further defines the nature of the genetic pathway required for the initiation of neural tube closure and provides an important new candidate that may be implicated in the aetiology of human NTDs.

journal_name

Hum Mol Genet

journal_title

Human molecular genetics

authors

Murdoch JN,Henderson DJ,Doudney K,Gaston-Massuet C,Phillips HM,Paternotte C,Arkell R,Stanier P,Copp AJ

doi

10.1093/hmg/ddg014

subject

Has Abstract

pub_date

2003-01-15 00:00:00

pages

87-98

issue

2

eissn

0964-6906

issn

1460-2083

journal_volume

12

pub_type

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