Abstract:
:Mutations in the gene encoding fibrillin-1 (FBN1), a component of the extracellular microfibril, cause Marfan syndrome (MFS). Frequent observation of cattle with a normal withers height, but lower body weight than age-matched normal cattle, was recently reported among cattle sired by phenotypically normal Bull A, in Japanese Black cattle. These cattle also showed other characteristic features similar to the clinical phenotype of human MFS, such as a long phalanx proximalis, oval face and crystalline lens cloudiness. We first screened a paternal half-sib family comprising 36 affected and 10 normal offspring of Bull A using the BovineSNP50 BeadChip (illumina). Twenty-two microsatellite markers mapped to a significant region on BTA10 were subsequently genotyped on the family. The bovine Marfan syndrome-like disease (MFSL) was mapped onto BTA10. As FBN1 is located in the significant region, FBN1 was sequenced in Bull A, and three affected and one normal cattle. A G>A mutation at the intron64 splicing accepter site (c.8227-1G>A) was detected in 31 of 36 affected animals (84.7%). The c.8227-1G>A polymorphism was not found in 20 normal offspring of Bull A or in 93 normal cattle unrelated to Bull A. The mutation caused a 1-base shift of the intron64 splicing accepter site to the 3' direction, and a 1-base deletion in processed mRNA. This 1-base deletion creates a premature termination codon, and a 125-amino acid shorter Fibrillin-1 protein is produced from the mutant mRNA. We therefore conclude that the c.8227-1G>A mutation is causative for MFSL. Furthermore, it was suggested that Bull A exhibited germline mosaicism for the mutation, and that the frequency of the mutant sperm was 14.9%.
journal_name
Anim Genetjournal_title
Animal geneticsauthors
Hirano T,Matsuhashi T,Kobayashi N,Watanabe T,Sugimoto Ydoi
10.1111/j.1365-2052.2011.02209.xsubject
Has Abstractpub_date
2012-02-01 00:00:00pages
11-7issue
1eissn
0268-9146issn
1365-2052journal_volume
43pub_type
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