5. Verification of melon-cucumber syntenic relationships
In this study, in silico PCR and BLAST sequence alignment
proved useful for inferring the cucumber scaffold
location of markers on the melon consensus map (Figures
2 and 3). To verify the syntenic relationships
between cucumber and melon chromosomes detected
from comparative mapping conducted herein, a similar strategy was used with molecular markers from a melon linkage map developed by Deleu et al. [36]. This genebased melon linkage map consists of 414 marker loci, of which nearly 200 were SNPs developed from melon EST sequences, and all these markers were derived exclusively from the melon genome. The details of this map are shown in Table S5 (Additional File 1). The genomic
or EST sequences from which these markers were developed were used in BLAST analysis against the cucumber draft genome assemblies. Of the 414 markers, only 3(0.7%) did not yield either in silico PCR products or BLAST hits in the cucumber draft genomes examined.This contrasted with markers on the consensus melon map (Table S3), where 81 (20.2%) of 401 (mostly genomic DNA-derived markers) did not produce hits in
either Gy14 or 9930 genome assembly. This suggests that the EST sequences examined are highly conserved between these genomes. The syntenic relationships between melon and cucumber chromosomes inferred from this gene-based melon genetic map are shown in Table S5 (Additional File 1).Although there were no cucumber source markers on this map, melon-cucumber syntenic relationships revealed from the present study (Figures 2 and 3) were confirmed by this independent study [36].
5. Verification of melon-cucumber syntenic relationships
In this study, in silico PCR and BLAST sequence alignment
proved useful for inferring the cucumber scaffold
location of markers on the melon consensus map (Figures
2 and 3). To verify the syntenic relationships
between cucumber and melon chromosomes detected
from comparative mapping conducted herein, a similar strategy was used with molecular markers from a melon linkage map developed by Deleu et al. [36]. This genebased melon linkage map consists of 414 marker loci, of which nearly 200 were SNPs developed from melon EST sequences, and all these markers were derived exclusively from the melon genome. The details of this map are shown in Table S5 (Additional File 1). The genomic
or EST sequences from which these markers were developed were used in BLAST analysis against the cucumber draft genome assemblies. Of the 414 markers, only 3(0.7%) did not yield either in silico PCR products or BLAST hits in the cucumber draft genomes examined.This contrasted with markers on the consensus melon map (Table S3), where 81 (20.2%) of 401 (mostly genomic DNA-derived markers) did not produce hits in
either Gy14 or 9930 genome assembly. This suggests that the EST sequences examined are highly conserved between these genomes. The syntenic relationships between melon and cucumber chromosomes inferred from this gene-based melon genetic map are shown in Table S5 (Additional File 1).Although there were no cucumber source markers on this map, melon-cucumber syntenic relationships revealed from the present study (Figures 2 and 3) were confirmed by this independent study [36].
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