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Evaluation of ADAMTS17 in Chinese Shar-Pei with primary open-angle glaucoma, primary lens luxation, or both

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  • 1 Canine Genetics Research Department, Animal Health Trust, Lanwades Park, Kentford, Newmarket, Suffolk, CB8 7UU, England
  • | 2 Canine Genetics Research Department, Animal Health Trust, Lanwades Park, Kentford, Newmarket, Suffolk, CB8 7UU, England
  • | 3 Canine Genetics Research Department, Animal Health Trust, Lanwades Park, Kentford, Newmarket, Suffolk, CB8 7UU, England
  • | 4 Canine Genetics Research Department, Animal Health Trust, Lanwades Park, Kentford, Newmarket, Suffolk, CB8 7UU, England
  • | 5 Department of Pathobiology, College of Veterinary Medicine, University of Missouri, Columbia, MO 65211.
  • | 6 Department of Veterinary Medicine and Surgery, College of Veterinary Medicine, University of Missouri, Columbia, MO 65211.
  • | 7 Canine Genetics Research Department, Animal Health Trust, Lanwades Park, Kentford, Newmarket, Suffolk, CB8 7UU, England

Abstract

OBJECTIVE To evaluate the coding regions of ADAMTS17 for potential mutations in Chinese Shar-Pei with a diagnosis of primary open-angle glaucoma (POAG), primary lens luxation (PLL), or both.

ANIMALS 63 Shar-Pei and 96 dogs of other breeds.

PROCEDURES ADAMTS17 exon resequencing was performed on buccal mucosal DNA from 10 Shar-Pei with a diagnosis of POAG, PLL, or both (affected dogs). A candidate causal variant sequence was identified, and additional dogs (53 Shar-Pei [11 affected and 42 unaffected] and 95 dogs of other breeds) were genotyped for the variant sequence by amplified fragment length polymorphism analysis. Total RNA was extracted from ocular tissues of 1 affected Shar-Pei and 1 ophthalmologically normal Golden Retriever; ADAMTS17 cDNA was reverse transcribed and sequenced, and ADAMTS17 expression was evaluated by quantitative reverse-transcription PCR assay.

RESULTS All affected Shar-Pei were homozygous for a 6-bp deletion in exon 22 of ADAMTS17 predicted to affect the resultant protein. All unaffected Shar-Pei were heterozygous or homozygous for the wild-type allele. The variant sequence was significantly associated with affected status (diagnosis of POAG, PLL, or both). All dogs of other breeds were homozygous for the wild-type allele. The cDNA sequencing confirmed presence of the expected variant mRNA sequence in ocular tissue from the affected dog only. Gene expression analysis revealed a 4.24-fold decrease in the expression of ADAMTS17 in ocular tissue from the affected dog.

CONCLUSIONS AND CLINICAL RELEVANCE Results supported that the phenotype (diagnosis of POAG, PLL, or both) is an autosomal recessive trait in Shar-Pei significantly associated with the identified mutation in ADAMTS17.

Supplementary Materials

    • Supplementary Table S1 (PDF 39 kb)

Contributor Notes

Dr. Farias’ present address is McDonnell Genome Institute, School of Medicine, Washington University, St Louis, MO 63108.

Address correspondence to Dr. Oliver (James.Oliver@aht.org.uk).