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Duplication events downstream of IRX1 cause North Carolina macular dystrophy at the MCDR3 locus.

  • Author(s): Cipriani, Valentina
  • Silva, Raquel S
  • Arno, Gavin
  • Pontikos, Nikolas
  • Kalhoro, Ambreen
  • Valeina, Sandra
  • Inashkina, Inna
  • Audere, Mareta
  • Rutka, Katrina
  • Puech, Bernard
  • Michaelides, Michel
  • van Heyningen, Veronica
  • Lace, Baiba
  • Webster, Andrew R
  • Moore, Anthony T
  • et al.
Abstract

Autosomal dominant North Carolina macular dystrophy (NCMD) is believed to represent a failure of macular development. The disorder has been linked to two loci, MCDR1 (chromosome 6q16) and MCDR3 (chromosome 5p15-p13). Recently, non-coding variants upstream of PRDM13 (MCDR1) and a duplication including IRX1 (MCDR3) have been identified. However, the underlying disease-causing mechanism remains uncertain. Through a combination of sequencing studies on eighteen NCMD families, we report two novel overlapping duplications at the MCDR3 locus, in a gene desert downstream of IRX1 and upstream of ADAMTS16. One duplication of 43 kb was identified in nine families (with evidence for a shared ancestral haplotype), and another one of 45 kb was found in a single family. Three families carry the previously reported V2 variant (MCDR1), while five remain unsolved. The MCDR3 locus is thus refined to a shared region of 39 kb that contains DNAse hypersensitive sites active at a restricted time window during retinal development. Publicly available data confirmed expression of IRX1 and ADAMTS16 in human fetal retina, with IRX1 preferentially expressed in fetal macula. These findings represent a major advance in our understanding of the molecular genetics of NCMD and provide insights into the genetic pathways involved in human macular development.

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