Long-Range Polymerase Chain Reaction for Specific Full-Length Amplification of the Human Keratin 14 Gene and Novel Keratin 14 Mutations in Epidermolysis.

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Long-Range Polymerase Chain Reaction for Specific Full-Length Amplification of the Human Keratin 14 Gene and Novel Keratin 14 Mutations in Epidermolysis Bullosa Simplex Patients Pamela Wood, W.H. Irwin McLean Journal of Investigative Dermatology Volume 120, Issue 3, Pages 495-497 (March 2003) DOI: 10.1046/j.1523-1747.2003.12052.x Copyright © 2003 The Society for Investigative Dermatology, Inc Terms and Conditions

Figure 1 Long-range PCR to detect novel KRT14 mutations in EBS patients. (a) PCR amplification of a 5.1kb genomic DNA fragment containing all exons and flanking regions of the functional KRT14 gene analyzed on a 1% agarose/0.5 x TBE gel. Lane 1, molecular weight markers (Hyperladder I, Bioline, London, U.K.), the arrow indicates 5kb marker; lane 2, typical PCR product amplified from a normal control DNA; lane 3, negative control showing no amplification. (b)-(g) Direct sequencing of KRT14 long-range PCR products with internal primers. Sequences shown in panels b, c, d, and f were generated with sequencing primer K14p8 (+ strand, 5′ GGG GGA GCC TAT GGG TTG GGG 3′). Sequences shown in panels e and g were generated with sequencing primer K14pm20 (+ strand, 5′ CAG AGC GGC AAG AGC GAG AT 3′). (b) Normal control sequence from exon 1, showing codons 126–130. A CCT repeat is present in this region of the gene (boxed). (c) The same region as shown in (b) derived from a patient with EBS Dowling–Meara, showing heterozygous deletion mutation 383delCCT, predicting the amino acid change 128delS in the helix initiation motif of the K14 polypeptide. The first CCT repeat is unchanged (boxed) but the second CCT is deleted, leading to overlapping sequence traces. This mutation occurs in a known mutation hotspot associated with severe EBS phenotypes. (d) Normal control sequence from exon 1, showing codons 146–150. (e) Normal control sequence from exon 6, showing codons 414–418. (f) The same region as shown in (d) derived from a patient with EBS Weber–Cockayne, showing heterozygous transition mutation 442C→T, predicting the amino acid change R148C in the latter half of the 1A domain of the K14 polypeptide. This is a known mutation hotspot associated with milder EBS phenotypes. (g) The same region as shown in (e) derived from a patient with EBS Dowling–Meara, showing heterozygous transversion mutation 1247G→C, predicting the amino acid change R416P in the helix termination motif of the K14 polypeptide. This is a known mutation hotspot associated with more severe EBS phenotypes. Journal of Investigative Dermatology 2003 120, 495-497DOI: (10.1046/j.1523-1747.2003.12052.x) Copyright © 2003 The Society for Investigative Dermatology, Inc Terms and Conditions