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A Strategy to Identify de Novo Mutations in Common Disorders such as Autism and Schizophrenia
05:51

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Published on: June 15, 2011

Identifying autism loci and genes by tracing recent shared ancestry.

Eric M Morrow1, Seung-Yun Yoo, Steven W Flavell

  • 1Division of Genetics, Children's Hospital Boston and Harvard Medical School, Boston, MA 02115, USA.

Science (New York, N.Y.)
|July 16, 2008
PubMed
Summary

This study used homozygosity mapping in families to identify inherited causes of autism-spectrum disorders. Key genes like PCDH10 and DIA1 were implicated, suggesting altered gene expression in neural activity is a common autism mechanism.

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Area of Science:

  • Genetics
  • Neuroscience
  • Developmental Disorders

Background:

  • Autism-spectrum disorders (ASD) are complex neurodevelopmental conditions with significant genetic contributions.
  • Identifying specific genetic mutations underlying ASD is crucial for understanding its etiology and developing targeted interventions.
  • Studying families with shared ancestry can enhance the detection of inherited genetic factors in heterogeneous disorders.

Purpose of the Study:

  • To identify inherited genetic causes of autism-spectrum disorders using homozygosity mapping in consanguineous families.
  • To investigate the role of homozygous deletions and other mutations in genes associated with ASD.
  • To explore potential shared molecular mechanisms, such as altered gene expression in response to neuronal activity, across diverse ASD mutations.

Main Methods:

  • Utilized homozygosity mapping in families with shared ancestry to identify inherited genetic variants.
  • Performed locus mapping to pinpoint chromosomal regions associated with autism.
  • Analyzed identified deletions and mutations in candidate genes, including PCDH10, DIA1, and NHE9, assessing their expression patterns.

Main Results:

  • Identified several chromosomal loci linked to autism, including large, inherited, homozygous deletions.
  • Implicated genes such as PCDH10 and DIA1, which exhibit expression changes related to neuronal activity.
  • Discovered additional mutations in genes like NHE9 in patients from unrelated families, indicating diverse genetic underpinnings.
  • Demonstrated the effectiveness of homozygosity mapping for dissecting genetic causes in heterogeneous disorders like ASD.

Conclusions:

  • Homozygosity mapping is a valuable approach for identifying inherited causes of complex and heterogeneous disorders like autism.
  • Defective regulation of gene expression in response to neural activity may represent a common pathogenic mechanism in diverse forms of autism.
  • Genes such as PCDH10 and DIA1 are critical candidates for further investigation into the genetic basis of autism-spectrum disorders.