Novel LINS1 missense mutation in a family with non-syndromic intellectual disability.
Newer sequencing technologies decipher molecular variations and increase the knowledge of pathogenesis of complex diseases like intellectual disability (ID), affecting 2-3% of the population. We report a novel family with a missense mutation in LINS1 as a cause for non-syndromic ID. Clinical exome sequencing for ID related genes carried out for a male with dysmorphism, mutism, and cognitive delay was uninformative. Subsequently, "pathogenic" and "likely pathogenic" variants associated with other inherited disorders were searched for as secondary findings. Further, PCR-RFLP carried out in other family members confirmed the result. A novel missense variant (c.937G>A) in exon 5 of LINS1 was detected in the proband. His affected elder brother was homozygous and the parents were heterozygous respectively, for the mutation. No mutation was observed in his unaffected sister. Mutations in LINS1 were suspected in this non-syndromic ID case with mutism. LINS1 alterations affect ELAV1 expression and result in reduction in the commissural axonal growth, thus affecting peripheral and central neuronal function. LINS1 acts in association with β-catenin to influence WNT1 signaling. It is hypothesized that mutations in LINS1 may alter HuR expression during neural differentiation, leading to ID in humans. © 2017 Wiley Periodicals, Inc.
FRIGE's Institute of Human Genetics, Ahmedabad, Gujarat, India.
Jayesh
J
Sheth
Department of Genetic Engineering, SRM University, Kattankulathur, Tamil Nadu, India.
Gyan
G
Ranjan
FRIGE's Institute of Human Genetics, Ahmedabad, Gujarat, India.
Krati
K
Shah
FRIGE's Institute of Human Genetics, Ahmedabad, Gujarat, India.
Riddhi
R
Bhavsar
FRIGE's Institute of Human Genetics, Ahmedabad, Gujarat, India.
Frenny
F
Sheth
D001483:Base Sequence; D059472:Exome; D005190:Family; D005260:Female; D015870:Gene Expression; D006579:Heterozygote; D059014:High-Throughput Nucleotide Sequencing; D006720:Homozygote; D006801:Humans; D008607:Intellectual Disability / Q000175:diagnosis / Q000235:genetics* / Q000503:physiopathology; D008297:Male; D008958:Models, Molecular; D020125:Mutation, Missense; D009155:Mutism / Q000175:diagnosis / Q000235:genetics* / Q000503:physiopathology; D010375:Pedigree; D012150:Polymorphism, Restriction Fragment Length; D017433:Protein Structure, Secondary; D011506:Proteins / Q000737:chemistry / Q000235:genetics* / Q000378:metabolism; D055815:Young Adult
C470382:LINS1 protein, human; D011506:Proteins
LINS1 gene; WNT1 gene; intellectual disability; mutism; neuron differentiation