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Background  Inherited intellectual disability (ID) conditions are a group of genetically heterogeneous disorders that lead to variable degrees of cognition deficits. It has been shown that inherited ID can be caused by mutations in over 100 different genes and there is evidence for the presence of as yet unidentified genes in a significant proportion of patients. We aimed at identifying the defective gene underlying an autosomal recessive ID in two sibs of an Emirati family.    Methods  A combined approach involving homozygosity mapping and whole-exome sequencing was used to identify the causative mutation. RNA analysis was performed to gain further insight into the pathogenic effect of the detected mutation.    Results  We have identified a homozygous splicing mutation (c.1219_1222+1delAAAGG) in the  LINS  gene in the affected children.  LINS  is the human homologue of the Drosophila segment polarity gene  lin  that encodes an essential regulator of the wingless/Wnt signaling. The identified mutation alters the first consensus nucleotide of the 5' donor splice junction of intron 5 and the 3' end of exon 5. Transcript analysis revealed that this change leads to an exon skipping event resulting in direct splicing of exon 4 to exon 6. Another mutation in  LINS  has been described very briefly in an Iranian family with autosomal recessive ID and microcephaly.    Conclusion  Our study confirms that  LINS , a modulator of the WNT pathway, is an indispensable gene to human cognition and this finding sheds further light on the importance of WNT signaling in human brain development and/or function.

LINS, a modulator of the WNT signaling pathway, is involved in human cognition