Association of missense variants in GDF9 with litter size in Entlebucher Mountain dogs.

Torrecilha, R B P; Milanesi, M; Gallana, M; Falbo, A-K; Reichler, I M; Hug, Petra; Jagannathan, Vidya; Trigo, B B; Paulan, S C; Bruno, D B; Garcia, S D; Scaramele, N F; Lopes, F L; Dolf, Gaudenz; Leeb, Tosso; Sölkner, J; Garcia, J F; Pieńkowska-Schelling, A; Schelling, C and Utsunomiya, Y T (2020). Association of missense variants in GDF9 with litter size in Entlebucher Mountain dogs. Animal genetics, 51(1), pp. 78-86. Wiley 10.1111/age.12882

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In the past two decades, average litter size (ALS) in Entlebucher Mountain dogs decreased by approximately 0.8 puppies. We conducted a GWAS for ALS using the single-step methodology to take advantage of 1632 pedigree records, 892 phenotypes and 372 genotypes (173 662 markers) for which only 12% of the dogs had both phenotypes and genotypes available. Our analysis revealed associations towards the growth differentiation factor 9 gene (GDF9), which is known to regulate oocyte maturation. The trait heritability was estimated at 43.1%, from which approximately 15% was accountable by the GDF9 locus alone. Therefore, markers flanking GDF9 explained approximately 6.5% of the variance in ALS. Analysis of WGSs revealed two missense substitutions in GDF9, one of which (g.11:21147009G>A) affected a highly conserved nucleotide in vertebrates. The derived allele A was validated in 111 dogs and shown to be associated with decreased ALS (-0.75 ± 0.22 puppies per litter). The variant was further predicted to cause a proline to serine substitution. The affected residue was immediately followed by a six-residue deletion that is fixed in the canine species but absent in non-canids. We further confirmed that the deletion is prevalent in the Canidae family by sequencing three species of wild canids. Since canids uniquely ovulate oocytes at the prophase stage of the first meiotic division, requiring maturation in the oviduct, we conjecture that the amino acid substitution and the six-residue deletion of GDF9 may serve as a model for insights into the dynamics of oocyte maturation in canids.

Item Type:

Journal Article (Original Article)

Division/Institute:

05 Veterinary Medicine > Department of Clinical Research and Veterinary Public Health (DCR-VPH) > Institute of Genetics
05 Veterinary Medicine > Department of Clinical Research and Veterinary Public Health (DCR-VPH)

UniBE Contributor:

Hug, Petra; Jagannathan, Vidya; Dolf, Gaudenz and Leeb, Tosso

Subjects:

500 Science > 570 Life sciences; biology
500 Science > 590 Animals (Zoology)
600 Technology > 610 Medicine & health

ISSN:

1365-2052

Publisher:

Wiley

Language:

English

Submitter:

Tosso Leeb

Date Deposited:

17 Dec 2019 11:17

Last Modified:

11 Jan 2020 01:33

Publisher DOI:

10.1111/age.12882

PubMed ID:

31802524

Uncontrolled Keywords:

Canis lupus familiaris multiple ovulation number of offspring single nucleotide polymorphism single-step genomic best linear unbiased prediction

BORIS DOI:

10.7892/boris.136691

URI:

https://boris.unibe.ch/id/eprint/136691

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