Why Are There Duplicate Refseq Entries Mapping To Identical Genome Locations?

Question

[4evo.11.ove4]

I know refseq may duplicate gene IDs if they map to multiple regions on the genome.

This is different - I'm finding duplicates even for genes which map to _identical_ regions on the genome. For example, this query for chr1:77548961-77812107 on the most recent rnor5 genome returns two results:

The two results are exactly identical. Why is this?

>rn5_refGene_NM_001025131 range=chr1:77548961-77812107 5'pad=0 3'pad=0 strand=- repeatMasking=none
tcatgaacttgggcgcacaaatgcagcagaatgttctttgtatgagttca
aattgctcaataaaataatccttgtctctgtgttacaatatttatttatt
cctatcagtagctagtttcacaagagactagagaatgttaatgatttttt
aattgcactataaatcttacctctcagcatttgctataaacagaacaggt
ATGATGTCAGACTATACTTGGTTTGAAGGAATACCTTTTCCTGCCTTTTG
GTTTTCCAAAGAAATTCTGGAAAATAGTTGTAAGAAGTTTGTGGTAAAAG
AAGACGACTTGATCATATTGACTTACCCCAAGTCAGGAACGAACTGGCTG
ATCGAGATTGTCTGCTTGATTCAGACCAAGGGAGATCCCAAGTGGATCCA
ATCTATGCCCATCTGGGATCGCTCACCCTGGATAGAGACTGGTTCAGGAT
ATGATAAATTAACCAAAATGGAAGGACCACGACTCATGACCTCCCATCTT
CCCATGCATCTTTTCTCCAAGTCTCTCTTCAGTTCCAAGGCCAAGGTGAT
ATATCTCATCAGAAATCCCAGAGATGTTCTTGTTTCTGCTTATTTTTTCT
GGAGTAAGATCGCCCTGGAGAAGAAACCAGACTCGCTGGGAACTTACGTT
GAATGGTTCCTCAAAGGAAATGTTGCATATGGATCATGGTTTGAGCACAT
CCGTGGCTGGCTGTCTATGAGAGAATGGGACAACTTCTTGGTACTGTACT
ATGAAGACATGAAAAAGGATACAATGGGATCCATAAAGAAGATATGTGAC
TTCCTGGGGAAAAAATTAGAGCCAGATGAGCTGAATTTGGTCCTCAAGTA
TAGTTCCTTCCAAGTCGTGAAAGAAAACAACATGTCCAATTATAGCCTCA
TGGAGAAGGAACTGATTCTTACTGGTTTTACTTTCATGAGAAAAGGCACA
ACTAATGACTGGAAGAATCACTTCACAGTAGCCCAAGCTGAAGCCTTTGA
TAAAGTGTTCCAGGAGAAAATGGCCGGTTTCCCTCCAGGGATGTTCCCAT
GGGAATAAattgtgaaagtaattttttaaaagatagtattattaatacta
gtagtatcagcggtggtggtggtggtggtggtggtggtggtggtggtggt
ggtggtgggtgtacctttcagtttgtagtgcctttagatgccagaacact
gcactggtactagggacctgcagtttcattaagctgtaaacttcttgctt
tgggtgct
>rn5_refGene_NM_001025131 range=chr1:77548961-77812107 5'pad=0 3'pad=0 strand=- repeatMasking=none
tcatgaacttgggcgcacaaatgcagcagaatgttctttgtatgagttca
aattgctcaataaaataatccttgtctctgtgttacaatatttatttatt
cctatcagtagctagtttcacaagagactagagaatgttaatgatttttt
aattgcactataaatcttacctctcagcatttgctataaacagaacaggt
ATGATGTCAGACTATACTTGGTTTGAAGGAATACCTTTTCCTGCCTTTTG
GTTTTCCAAAGAAATTCTGGAAAATAGTTGTAAGAAGTTTGTGGTAAAAG
AAGACGACTTGATCATATTGACTTACCCCAAGTCAGGAACGAACTGGCTG
ATCGAGATTGTCTGCTTGATTCAGACCAAGGGAGATCCCAAGTGGATCCA
ATCTATGCCCATCTGGGATCGCTCACCCTGGATAGAGACTGGTTCAGGAT
ATGATAAATTAACCAAAATGGAAGGACCACGACTCATGACCTCCCATCTT
CCCATGCATCTTTTCTCCAAGTCTCTCTTCAGTTCCAAGGCCAAGGTGAT
ATATCTCATCAGAAATCCCAGAGATGTTCTTGTTTCTGCTTATTTTTTCT
GGAGTAAGATCGCCCTGGAGAAGAAACCAGACTCGCTGGGAACTTACGTT
GAATGGTTCCTCAAAGGAAATGTTGCATATGGATCATGGTTTGAGCACAT
CCGTGGCTGGCTGTCTATGAGAGAATGGGACAACTTCTTGGTACTGTACT
ATGAAGACATGAAAAAGGATACAATGGGATCCATAAAGAAGATATGTGAC
TTCCTGGGGAAAAAATTAGAGCCAGATGAGCTGAATTTGGTCCTCAAGTA
TAGTTCCTTCCAAGTCGTGAAAGAAAACAACATGTCCAATTATAGCCTCA
TGGAGAAGGAACTGATTCTTACTGGTTTTACTTTCATGAGAAAAGGCACA
ACTAATGACTGGAAGAATCACTTCACAGTAGCCCAAGCTGAAGCCTTTGA
TAAAGTGTTCCAGGAGAAAATGGCCGGTTTCCCTCCAGGGATGTTCCCAT
GGGAATAAattgtgaaagtaattttttaaaagatagtattattaatacta
gtagtatcagcggtggtggtggtggtggtggtggtggtggtggtggtggt
ggtggtgggtgtacctttcagtttgtagtgcctttagatgccagaacact
gcactggtactagggacctgcagtttcattaagctgtaaacttcttgctt
tgggtgct

Answer 1

[deanna.church]

This looks like a bug at UCSC- if you view the RefSeq annotation you only see this once: http://tinyurl.com/ngpwts3 I'd recommend reporting this to UCSC to try to find out more.