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This report details a case of SRY-negative XX sex reversal in a mixed breed dog and surveys affected dogs of several breeds for mutations in RSPO1 coding regions. Genomic DNA from the mixed breed case was evaluated for mutations in candidate genes. Sequencing identified a homozygous G to A transition in RSPO1 exon 4 that changes a highly conserved amino acid codon in the thrombospondin domain. The possibility that this was a single nucleotide polymorphism (SNP) could not be excluded bydoi:10.6084/m9.figshare.5120407 fatcat:v3ve3yquc5bvxk6srv3fdmh6zm