Haplotype Fine Mapping by Evolutionary Trees

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Haplotype Fine Mapping by Evolutionary Trees Johnny C. Lam, Kathryn Roeder, B. Devlin  The American Journal of Human Genetics  Volume 66, Issue 2, Pages 659-673 (February 2000) DOI: 10.1086/302756 Copyright © 2000 The American Society of Human Genetics Terms and Conditions

Figure 1 Homologous portions of a chromosome. The colored blocks represent adjacent markers, and matching colors represent matching alleles. a, Illustration of how, under the assumption that the disease mutation lies in gap 4, between markers 4 and 5, observed haplotypes A–E might be arranged with A as the root. In the tree, A→D and L1→E are unambiguous recombinations, whereas the other edges could be caused by either recombination or mutation. Notice that, although haplotypes A and E are similar, they cannot be directly connected by a single edge. It appears that a haplotype is missing from the sample (or the population). Thus a latent haplotype (L1) is required for completion of the tree. The topology is approximately star shaped, with most haplotypes directly connected to the root, as would be expected from evolutionary theory for rapidly growing populations. b, Same scenario under the assumption that three more haplotypes (F–H) are observed. Of haplotypes A–E, F is most similar to D. To connect this pair, two latent haplotypes are required. Consequently, when the haplotypes are fit into a single tree, the tree is spindly rather than star shaped. If, however, two trees are fit to these data, then haplotypes A–E and F–H will split into separate clusters. The American Journal of Human Genetics 2000 66, 659-673DOI: (10.1086/302756) Copyright © 2000 The American Society of Human Genetics Terms and Conditions

Figure 2 Tree structure for a homogeneous subset of 31 unique HH haplotypes. Circles signify the five inferred, latent haplotypes. The American Journal of Human Genetics 2000 66, 659-673DOI: (10.1086/302756) Copyright © 2000 The American Society of Human Genetics Terms and Conditions

Figure 3 Observed and latent haplotypes corresponding to figure 2. “ANC” denotes the inferred most recent ancestor, “Weight” denotes the negative log likelihood of the edge connecting the haplotype to ANC, and “[L]” denotes a latent haplotype. The portion of the haplotype that differs from ANC is color-coded green for single-marker differences and red for differences occurring in blocks. The American Journal of Human Genetics 2000 66, 659-673DOI: (10.1086/302756) Copyright © 2000 The American Society of Human Genetics Terms and Conditions

Figure 4 Tree structure for the entire set of 39 unique HH haplotypes, plus latents (circles). The American Journal of Human Genetics 2000 66, 659-673DOI: (10.1086/302756) Copyright © 2000 The American Society of Human Genetics Terms and Conditions

Figure 5 Twenty observed and latent haplotypes corresponding to figure 4 but not reported in figure 3. Combining the observed haplotypes depicted here and in figure 3 yields the entire sample of haplotypes. The American Journal of Human Genetics 2000 66, 659-673DOI: (10.1086/302756) Copyright © 2000 The American Society of Human Genetics Terms and Conditions