Abstract:
:Lethal recessive alleles cause pre- or postnatal death in homozygous affected individuals, reducing fertility. Especially in small size domestic and wild populations, those alleles might be exposed by inbreeding, caused by matings between related parents that inherited the same recessive lethal allele from a common ancestor. In this study we report five relatively common (up to 13.4% carrier frequency) recessive lethal haplotypes in two commercial pig populations. The lethal haplotypes have a large effect on carrier-by-carrier matings, decreasing litter sizes by 15.1 to 21.6%. The causal mutations are of different type including two splice-site variants (affecting POLR1B and TADA2A genes), one frameshift (URB1), and one missense (PNKP) variant, resulting in a complete loss-of-function of these essential genes. The recessive lethal alleles affect up to 2.9% of the litters within a single population and are responsible for the death of 0.52% of the total population of embryos. Moreover, we provide compelling evidence that the identified embryonic lethal alleles contribute to the observed heterosis effect for fertility (i.e. larger litters in crossbred offspring). Together, this work marks specific recessive lethal variation describing its functional consequences at the molecular, phenotypic, and population level, providing a unique model to better understand fertility and heterosis in livestock.
journal_name
PLoS Genetjournal_title
PLoS geneticsauthors
Derks MFL,Gjuvsland AB,Bosse M,Lopes MS,van Son M,Harlizius B,Tan BF,Hamland H,Grindflek E,Groenen MAM,Megens HJdoi
10.1371/journal.pgen.1008055subject
Has Abstractpub_date
2019-03-15 00:00:00pages
e1008055issue
3eissn
1553-7390issn
1553-7404pii
PGENETICS-D-18-02080journal_volume
15pub_type
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