This is a revised version of an earlier query that may not have been stated very clearly:
I have noticed a mismatch between the coordinates given by ExonStart / ExonEnd and exon range from the UCSC genome browser's annotation of hg19 human reference genome.
Specifically, the exonStarts and exonEnds coordinates that are given do not match the exon range given when the sequences are called. Typically, the exonStarts coordinate is 1 nucleotide prior to the exonStarts, as in the example below:
name chromosome strand exonStarts exonEnds exonFrame NM_030806 chr1 + 184559872 184559949 1 While the range is >hg19_refGene_NM_030806_2 range=chr1:184559873-184559949 5'pad=0 3'pad=0 strand=+ repeatMasking=none GAAAAAAGTGCCAGCTCAAATGTAAGACTTAAAACTAATAAAGAGGTTCCGGGATTAGTTCATCAACCCAGAGCAAA
Usually the mismatch between exonStarts and range is +1 nucleotide, but sometimes it is more than this. What is the reason for the discrepancy between range and exonStarts/exonEnds, and which number is the actual coordinate of the first nucleotide in the exon?