With even more distant comparison to the eudicots, >220 million years of independent descent, only rare segments of genic colinearity are observed at either full genome or local genome scales [58].
Among the 41 sequence types, 32 sequence types are remained (Table 3) after removing the types containing rare EPIYA segment types (i.e., B C, C', D', C" and D").
Nevertheless, due to the complexity of most of the rare anterior segment disorders of the eye, ranging from corneal disorders such as corneal dystrophies, neurotrophic keratitis, iridocorneal anomalies, and congenital glaucoma, further progress is mandatory to exert a significant impact on the natural history of the diseases [ 7– 10].
In conclusion, even though rhegmatogenous RD is a rare posterior segment complication of BD but it should be kept in mind especially if the patient presented with marked diminution of vision on top of the chronic course of the disease and careful examination should be considered especially in cases with media opacity.
It should be noted that NA11993 and NA12872 fell halfway between the CEU and YRI clusters in the PC-MDS analysis of their rare-het segments because the YRI-like DNA in each rare-het segment is carried on only one of the two homologous chromosomes.
Rare disease segments will be affected mostly in the long term.
The oddball paradigm has been shown to evoke KCs during sleep stage 2. By separating rare tone segments with or without KCs we aimed at identifying the neuronal representation of evoked KCs in BOLD based functional imaging.
Yet when we executed a PLINK run for each subject that only evaluated genotypes from that subject's largest rare-het segment, the recalculated PLINK distributions gave highly significant Z-scores (Z<−4.0) for all 6 subjects, clearly demonstrating the presence of ethnic outlier DNA within the subject's rare-het segment (Table 2).
Taken together, these results are strong evidence that the single, large rare-het segment in each CEU parent is of probable African origin and illustrates a type of PC-MDS analysis that could be routinely performed on individual rare-het segments.
For the specific analysis corresponding to its rare-het segment, NA11993 and NA12872 were observed halfway between the CEU and YRI clusters (Supplementary Material, Fig. S26) whereas all other HapMap subjects tightly clustered within their own ethnic group.
Using MDS of pairwise IBS genotype distances provided by PLINK (13), we plotted the first two principle components of distance for all HapMap subjects (CEU, YRI, CHB/JPT) by including only genotypes from the rare-het segment observed in NA11993 or, for a separate analysis, only from the segment in NA12872.
