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Exome Sequencing Identifies Truncating Mutations in Human SERPINF1 in Autosomal- Recessive Osteogenesis Imperfecta  Jutta Becker, Oliver Semler, Christian.

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Presentation on theme: "Exome Sequencing Identifies Truncating Mutations in Human SERPINF1 in Autosomal- Recessive Osteogenesis Imperfecta  Jutta Becker, Oliver Semler, Christian."— Presentation transcript:

1 Exome Sequencing Identifies Truncating Mutations in Human SERPINF1 in Autosomal- Recessive Osteogenesis Imperfecta  Jutta Becker, Oliver Semler, Christian Gilissen, Yun Li, Hanno Jörn Bolz, Cecilia Giunta, Carsten Bergmann, Marianne Rohrbach, Friederike Koerber, Katharina Zimmermann, Petra de Vries, Brunhilde Wirth, Eckhard Schoenau, Bernd Wollnik, Joris A. Veltman, Alexander Hoischen, Christian Netzer  The American Journal of Human Genetics  Volume 88, Issue 3, Pages (March 2011) DOI: /j.ajhg Copyright © 2011 The American Society of Human Genetics Terms and Conditions

2 Figure 1 Identification of a Homozygous Mutation in SERPINF1 by Exome Sequencing (A) Overview of SERPINF1 coverage by exome sequencing. Upper: An ideogram illustrating the SERPINF1 location in the chromosomal band 17p13.3 (red bar). Middle: The genomic structure and localization of SERPINF1 in more detail. Lower: The per-base coverage, with an axis to the right ranging from 0 to 275-fold coverage. (B) Detailed view of individual sequencing reads overlapping the stop mutation in exon 6. All 18 reads at the genomic position g.1,625,154 (hg18) display the homozygous stop mutation c.696C>G. (C) Validation of the SERPINF1 mutation in exon 6 by Sanger sequencing of genomic DNA. Electropherograms of a control individual, of the index patient, and of his father are shown. The position of the mutation is marked with an arrow. The affected codon is framed in black. The control individual carries the wild-type sequence (wt) in both copies of the gene. The patient's father is a heterozygous carrier of the mutation (genotype wt/mut). The patient is homozygous for the c.696C>G mutation (mut/mut). (D) Upper: Contains an ideogram of the p-arm of chromosome 17 illustrating the localization of SERPINF1. Lower : The homozygous regions on chromosome 17 at the genomic positions g.97,058-3,091,589 and g.3,299,188-4,983,922 are recognizable. Each dot represents one of the SNP markers that were included in the analysis. SNPs within a region that was called as homozygous are colored in purple. The position along the y axis indicates the ratio of the number of reads with the nonreference allele to the total number of reads; the value is 1.0 if only reference or nonreference reads are present at a given SNP position (y axis, ratio of variant reads/all reads per SNP position; x axis, genomic position along the p-arm of chromosome 17). The American Journal of Human Genetics  , DOI: ( /j.ajhg ) Copyright © 2011 The American Society of Human Genetics Terms and Conditions

3 Figure 2 SERPINF1 and PEDF Scheme
Schematic representation of pigment epithelium-derived factor (PEDF, NP_002606) and of the coding exons of the SERPINF1 cDNA (NM_ ). The locations of the exons are aligned relative to the regions of the PEDF each exon encodes. The positions of the three truncating mutations identified in OI patients are indicated by arrows. Several important protein domains described in the literature are depicted.36 The American Journal of Human Genetics  , DOI: ( /j.ajhg ) Copyright © 2011 The American Society of Human Genetics Terms and Conditions

4 Figure 3 Radiological Features of Patient 3
(A and B) Thorax and pelvis of patient 3 at the age of 6 months showing no signs of rip or clavicular fractures, only a slightly decreased vertebral height, a small pelvis and moderately delayed development of the hips. (C and D) Radiographs of the right and left leg when the patient was 1.6 years old show severe bowing of both femurs, multiple old and new fractures, and a pseudarthrosis in the right femur. In the epiphysis, lines resulting from intravenous bisphosphonate treatment are visible. The tibiae display no severe deformities. The American Journal of Human Genetics  , DOI: ( /j.ajhg ) Copyright © 2011 The American Society of Human Genetics Terms and Conditions

5 Figure 4 Radiological Features of Patient 4
(A) Hand radiogram at the age of 6 years shows no signs of fractures or skeletal dysplasia and only a mild delay of bone age. (B) The right arm at the age of 5.4 years shows severe deformities of the humerus with multiple old fractures and callus formation in the diaphysis. (C) Left hemithorax at the age of 4.3 years displays no deformities or fractures of rips. (D) Right leg at the age of 2.9 years after surgical rodding with an intramedullar telescopic rod because of a fracture. (E) Fractured right leg 3 months earlier. Also visible are the epiphyseal lines resulting from cyclic intravenous bisphosphonate treatment. (F) Left leg with a fracture after minimal trauma at the age of 2.2 years. (G) Left leg a few weeks later after surgical treatment with an intramedullar telescopic rod. The American Journal of Human Genetics  , DOI: ( /j.ajhg ) Copyright © 2011 The American Society of Human Genetics Terms and Conditions

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