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. 2014 Sep;46(9):944-50.
doi: 10.1038/ng.3050. Epub 2014 Aug 3.

A framework for the interpretation of de novo mutation in human disease

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A framework for the interpretation of de novo mutation in human disease

Kaitlin E Samocha et al. Nat Genet. 2014 Sep.

Abstract

Spontaneously arising (de novo) mutations have an important role in medical genetics. For diseases with extensive locus heterogeneity, such as autism spectrum disorders (ASDs), the signal from de novo mutations is distributed across many genes, making it difficult to distinguish disease-relevant mutations from background variation. Here we provide a statistical framework for the analysis of excesses in de novo mutation per gene and gene set by calibrating a model of de novo mutation. We applied this framework to de novo mutations collected from 1,078 ASD family trios, and, whereas we affirmed a significant role for loss-of-function mutations, we found no excess of de novo loss-of-function mutations in cases with IQ above 100, suggesting that the role of de novo mutations in ASDs might reside in fundamental neurodevelopmental processes. We also used our model to identify ∼1,000 genes that are significantly lacking in functional coding variation in non-ASD samples and are enriched for de novo loss-of-function mutations identified in ASD cases.

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Conflict of interest statement

Competing financial interests: The authors declare no competing financial interests.

Figures

Figure 1
Figure 1
The expected and observed fraction of genes with a de novo loss-of-function mutation in ASD cases and unaffected controls for four gene sets of interest–,,. “Betancur” refers to a set of genes reported as disrupted in individuals with ASD or autistic features; of the 112 on the list, we could evaluate 111. “FMRP” refers to the genes whose mRNAs are bound and regulated by the Fragile X Mental Retardation Protein (FMRP), as identified by Darnell and colleagues. The “constrained” category is a set of 1,003 genes that we defined as significantly lacking rare missense variation, indicating intolerance to mutation. The targets of FMRP that are also considered constrained by our metric make up the “Constrained FMRP” category. * indicates p < 0.01; ** indicates p < 10−4.
Figure 2
Figure 2
The distribution of missense Z scores and Z scores of de novo loss-of-function mutations identified in unaffected individuals, autism spectrum disorder (ASD) cases, and intellectual disability cases. (a) The distribution of missense Z scores. The red line indicates a Z score of 3.09, or the threshold for inclusion into the set of 1,003 constrained genes. (b) The missense Z scores for genes containing de novo LoF in unaffected individuals, ASD cases, and intellectual disability cases–,,,. Black bars indicate the mean Z score of each group: 0.94, 1.68, and 2.46 for unaffected individuals, ASD cases, and intellectual disability cases, respectively. While the missense Z scores of the de novo LoF mutations found in unaffected siblings matched the overall distribution (Wilcoxon p=0.8325, n.s. = not significant), de novo LoF mutations found in both ASD and intellectual disability cases were significantly shifted towards more extreme constraint values (p < 10−6 for both). All p-values for deviation from the overall distribution are listed on the right side of the figure in bold. In addition, the distribution of missense Z scores between each of the three de novo lists were all individually significant at p < 0.05.

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