Identification of small and large genomic candidate variants in bovine pulmonary hypoplasia and anasarca syndrome

I. M. Häfliger, N. Wiedemar, T. Švara, J. Starič, V. Cociancich, K. Šest, M. Gombač, T. Paller, J. S. Agerholm, C. Drögemüller (Lead / Corresponding author)

Research output: Contribution to journalArticlepeer-review

3 Citations (Scopus)

Abstract

The pulmonary hypoplasia and anasarca syndrome (PHA) is a congenital lethal disorder, which until now has been reported in cattle and sheep. PHA is characterized by extensive subcutaneous fetal edema combined with hypoplasia or aplasia of the lungs and dysplasia of the lymphatic system. PHA is assumed to be of genetic etiology. This study presents the occurrence of PHA in two different cattle breeds and their genetic causation. Two PHA cases from one sire were observed in Slovenian Cika cattle. Under the assumption of monogenic inheritance, genome-wide homozygosity mapping scaled down the critical regions to 3% of the bovine genome including a 43.6 Mb-sized segment on chromosome 6. Whole-genome sequencing of one case, variant filtering against controls and genotyping of a larger cohort of Cika cattle led to the detection of a likely pathogenic protein-changing variant perfectly associated with the disease: a missense variant on chromosome 6 in ADAMTS3 (NM_001192797.1: c.1222C>T), which affects an evolutionary conserved residue (NP_001179726.1: p.(His408Tyr)). A single PHA case was found in Danish Holstein cattle and was whole-genome sequenced along with its parents. However, as there was no plausible private protein-changing variant, mining for structural variation revealed a likely pathogenic trisomy of the entire chromosome 20. The identified ADAMTS3 associated missense variant and the trisomy 20 are two different genetic causes, which shows a compelling genetic heterogeneity for bovine PHA.

Original languageEnglish
Pages (from-to)382-390
Number of pages9
JournalAnimal Genetics
Volume51
Issue number3
Early online date18 Feb 2020
DOIs
Publication statusPublished - 7 May 2020

Keywords

  • cattle
  • chromosomal aberration
  • genetic disorder
  • Mendelian
  • monogenic
  • precision medicine
  • rare disease
  • trisomy

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