Twelve families with exuberant and early-onset calcium pyrophosphate dehydrate chondrocalcinosis (CC) and diffuse idiopathic skeletal hyperostosis (DISH), hereafter designated DISH/CC, were identified in Terceira Island, the Azores, Portugal. Ninety-two (92) individuals from these families were selected for whole-genome-wide linkage analysis. An identity-by-descent (IBD) analysis was performed in 10 individuals from 5 of the investigated pedigrees. The chromosome area with the maximal logarithm of the odds score (1.32; =0.007) was not identified using the IBD/identity-by-state (IBS) analysis; therefore, it was not investigated further. From the IBD/IBS analysis, two candidate genes, and , were identified and sequenced. Nine genetic variants were identified in the gene; one regulatory variant (rs146447064) was significantly more frequent in control individuals than in DISH/CC patients (=0.03). Four variants were identified in , and the rs201930700 variant was further investigated using segregation analysis. None of the genetic variants in or segregated within the studied families. Therefore, although a major genetic effect was shown to determine DISH/CC occurrence within these families, the specific genetic variants involved were not identified.

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http://www.ncbi.nlm.nih.gov/pmc/articles/PMC5666909PMC
http://dx.doi.org/10.1038/hgv.2017.41DOI Listing

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