P16INK4a and p14ARF Tumor Suppressor Genes Are Commonly Inactivated in Cutaneous Squamous Cell Carcinoma Victoria L. Brown, Catherine A. Harwood, Tim.

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p16INK4a and p14ARF Tumor Suppressor Genes Are Commonly Inactivated in Cutaneous Squamous Cell Carcinoma Victoria L. Brown, Catherine A. Harwood, Tim Crook, James G. Cronin, David P. Kelsell, Charlotte M. Proby Journal of Investigative Dermatology Volume 122, Issue 5, Pages 1284-1292 (May 2004) DOI: 10.1111/j.0022-202X.2004.22501.x Copyright © 2004 The Society for Investigative Dermatology, Inc Terms and Conditions

Figure 1 Loss of heterozygosity (LOH) analysis. Units on the y-axis represent intensity of fluorescent signal; on the x-axis is allele length in base pairs. The y-axis scaling differs between samples because quantities of PCR products vary in intensity. Examples show retention of heterozygosity (LOH index 0.64) for sample 14 at marker D9S171 and complete loss of the upper allele (LOH) for sample 31T compared to matched blood, 31B (arrows) at marker D9S1748. Note stutter bands are evident prior to the allele (highest peak) signal. Journal of Investigative Dermatology 2004 122, 1284-1292DOI: (10.1111/j.0022-202X.2004.22501.x) Copyright © 2004 The Society for Investigative Dermatology, Inc Terms and Conditions

Figure 2 Examples of mutations found in two cutaneous SCCs. Denaturing high-performance liquid chromatography traces (left) and corresponding sequencing results (right) for samples 31 (upper panel) and 54 (lower panel). Sequencing traces show heterozygous C→T base changes (arrowed) in exon 2 at nucleotide (nt) positions 242 and 270 for 31T; 238 for 54T. Journal of Investigative Dermatology 2004 122, 1284-1292DOI: (10.1111/j.0022-202X.2004.22501.x) Copyright © 2004 The Society for Investigative Dermatology, Inc Terms and Conditions

Figure 3 Representative examples of 10% acrylamide gels of methylation specific PCR products. The presence of a visible band in “U” lanes indicates unmethylated genes (normal stromal tissue); in “M” lanes indicates methylated genes. (A) p16INK4a is methylated in sample 21. (B) p14ARF is methylated in samples 3, 8, 27. Positive (Pos) controls were universally methylated or unmethylated DNA for the M and U PCR, respectively. H2O served as a negative (Neg) control for both reactions. Controls were included in every run. L=marker ladder. Journal of Investigative Dermatology 2004 122, 1284-1292DOI: (10.1111/j.0022-202X.2004.22501.x) Copyright © 2004 The Society for Investigative Dermatology, Inc Terms and Conditions

Figure 4 Immunohistochemistry slides showing predominant nuclear staining for p16INK4a antibody in tumor 44 and p14ARF antibody in tumor 29. Absence of expression is noted for p16INK4a in tumor 54 and p14ARF in tumor 31. Both these tumors had biallelic inactivating events detectable. Journal of Investigative Dermatology 2004 122, 1284-1292DOI: (10.1111/j.0022-202X.2004.22501.x) Copyright © 2004 The Society for Investigative Dermatology, Inc Terms and Conditions

Figure 5 Location of microsatellite markers used in allelotyping, relative to CDKN2A exons. Journal of Investigative Dermatology 2004 122, 1284-1292DOI: (10.1111/j.0022-202X.2004.22501.x) Copyright © 2004 The Society for Investigative Dermatology, Inc Terms and Conditions