I would like to ask about what kind of indels are incorporated into the
diploid genome assembly of the NA12878 individual, available from your lab:
In the readme it says that 829,454 indels were used to construct this
genome. What makes me confused is that when I perform a BLAST search with
one 1.7 kb deletion from NA12878.2010_06.and.fosmid.deletions.phased.vcf
(P2_M_061510_21_73), it shows up in both the maternal and paternal
haplotypes. Is there any size cutoff used for the indels that have been
selected for this assembly?
Unfortunately, in the latest version, no fosmid indels/SVs were used; only the variant output of GATK Best Practices v3 was used, even though fosmid data was indeed used to construct the earlier versions of the diploid genome. We might include them in the future. Thank you.
I am looking for a tool to detect allele specific expression from resequencing and RNA-seq data. I find AlleleSeq could be quite powerful. I noticed the input for the software needs parents genotype data; it requires a VCF file which contains trio genotype to create maternal and paternal genome. But in my case, if I only have genotype information from a single individual, how could I use AlleleSeq?
You dont have to genotype parents. You only need to have variants phased in any way you can/wish (vcf2diploid tool only looks at one column with info for the individual of interest and does not consider other columns). Having trio sequenced is an easy and, probably, the best way to do it.
If you have the mothers genotype only, then you can phase a good fraction of heterozygous variants. Each unphased variants will be randomly assigned to a particular haplotype, so half of them will also be correct. And, of course, all homozygous variants will be phased.
I believe I have discovered numerous errors in the NA12878 dataset. We are working with the most recent version,
NA12878_diploid_genome_may3_2011. They are all single base pair mismatches between the paternal and maternal chromosomes in regions that the accompanying .map file marks as contigs.
.map file shows continuous equivalent (without gaps) blocks between haplotypes. BUT THEY DO INCLUDE SNPs. So, heterozygous SNPs will result in base mismatch within a block.