Phenotypes

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Eager et al. (2025): "Whole-genome sequencing of an affected calf identified a homozygous frameshift variant in the HEXA gene (NC_037337.1:g.19269480_19269481delinsGGAGT, NM_001075164.2: c.(834_835delinsACTCC)), absent from 18 control genomes and 1842 individuals in the 1000 Bull Genomes Project. The variant was confirmed in homozygous form in all four affected animals by Sanger sequencing and meets multiple criteria for pathogenicity."

This phene includes references to studies involving gene edited or genetically modified organisms (GMO).

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By cloning and sequencing a very likely comparative candidate gene (based on the homologous human disorder), Dennis et al. (2000) identified two causal mutations in Brahman cattle, namely a frameshifting 2-bp deletion (c.1057delTA; the "E7" mutation) and a nonsense mutation (c.1783C>T; p.Arg595Ter; the "E13" mutation) in the bovine GAA gene; and a 2-bp frameshifting deletion (c.2454delCA; the "E18" mutation) in Shorthorns.

The first occurrence of this disorder in any domestic species was reported by Angelos et al. (1995), in Charolais cattle.

The causative mutation for this disorder was discovered via the candidate gene approach. Tassi et al. (1984) reported a 10-15-fold decrease in the concentration of TG mRNA in affected cattle; Ricketts et al. (1985) reported the use of S1 nuclease assays and electron microscopy to narrow down the location of the mutation to the junction of exon 9 and intron 9; and Ricketts et al. (1987) reported the use of cloning and sequencing of genomic DNA ...

This disorder is associated with white coat colour (Lauvergne, 1970).

Eusebi et al. (2022): "Whole genome resequencing of three affected calves and three putative non-carrier parents identified a novel missense variant (c.149G>A|p.Cys50Tyr) in exon 2 of the endothelin 2 (EDN2) gene. Bioinformatic analyses of p.Cys50Tyr effects predicted them to be damaging for both the structure and the function of the edn2 protein, and to create a new site of splicing that may also affect the pattern of pre-mRNA splicing and...

Frameshift indel: c.771_778delTTGAAAAGinsCATC (rs379675307) in SLC2A2 that encodes glucose transporter 2 (GLUT2)(Pausch et al., 2015). Burgstaller et al. (2016) have provided strong evidence that this FH2 frameshift mutation is actually causative of Fanconi-Bickel syndrome (OMIA 000366-9913). Accordingly, the likely causal mutation is now listed under this disorder rather than in this entry.

No summary available.

No summary available.