In our previous effort of assessing conserved underlying haplotype patterns across ethnic populations, we constructed common haplotypes using SNPs having conserved linkage disequilibrium (LD) across ethnic populations.
The comparison of the detected QTL with results in cattle showed conserved linkage regions.
Annotation of a mini-contig including SPRN suggests conserved linkage between Oari22q24 and Hsap10q26.
A contig containing these genes was constructed and annotated, suggesting conserved linkage between sheep and man in this region.
Similarly, at different taxonomic levels, comparative gene mapping has revealed a highly conserved linkage homology between an agamid lizard (Leiolepis reevesii) and a snake (Elaphe quadrivirgata) [ 67].
They found that human antisense genes have largely conserved linkage in torafugu which may imply that big fraction of human overlapping genes represents vertebrates' ancestral overlaps.
Conserved linkages between Fugu and human genes indicate the preservation of chromosomal segments from the common vertebrate ancestor, but with considerable scrambling of gene order.
However, conserved linkages were observed that some amino acids are always gathered together: (A, G, H, L, P, Q, R, W) and (F, I, K, N, S, Y).
We found that the amino acids evolved independently in these three kingdoms; but, conserved linkages were observed in two groups of amino acids, (A, G, H, L, P, Q, R, and W) and (F, I, K, N, S, and Y).
In those cases where more than one gene maintained conserve linkage (human-teleost fish orthologous loci) with single enhancer the pattern of reporter expression induced by an enhancer was compared manually (via image data) with the reported endogenous expression pattern of syntenically conserved genes to establish the enhancer-gene relationship.
In brief, this process involves the establishment of a testis determining factor (TDF) on the proto Y-chromosome, the repression of X/Y recombination to conserve linkage between the TDF and male-beneficial genes on Y, and the consequential erosion of Y which cause the need for up-regulation of X-linked genes in males to restore the X-chromosome Autosomal ratio of critical genes [ 13, 14].
