OMIA 002366-9685 : Forebrain commissural malformation, ventriculomegaly and interhemispheric cysts, GDF7-related in Felis catus

Possibly relevant human trait(s) and/or gene(s) (MIM number): 604651 (gene)

Mendelian trait/disorder: yes

Mode of inheritance: Autosomal Recessive

Considered a defect: yes

Key variant known: yes

Year key variant first reported: 2020

Species-specific description: Previously listed in OMIA as OMIA 000478-9685 : Holoprosencephaly in Felis catus.

History: As summarised by Yu et al. (2020), "In an effort to develop a breed of cats [Toyger] having similar phenotypes to a tiger, including a small rounded ear, a mixed breed cat derived from the Oriental cat breed was discovered to have small rounded ears and hence, was used as a foundation sire for a breeding program. Outcross and backcross breeding indicated the phenotype was autosomal recessive [Keating et al., 2016]. However, a magnetic resonance imaging (MRI) examination of a kitten with the desired ear phenotype, which had an accidental head injury from a fall, indicated the presence of congenital hydrocephalus. Additional MRIs of the breeding stock suggested cats with the ear phenotype had congenital brain malformations. These cats have small rounded ear pinnae and doming of the head . . . . This extended family of mixed-breed cats derived from the Oriental breed has been characterized clinically and histopathologically with forebrain commissural malformation concurrent with ventriculomegaly and interhemispheric cysts. . . . As a result of the potentially harmful impacts associated with the trait, the breeder promptly discontinued the breeding program".

Inheritance: Keating et al. (2016) provided evidence consistent with autosomal recessive inheritance.

Mapping: Yu et al. (2020): "Forty-three cats were genotyped on the Illumina Infinium Feline 63K iSelect DNA Array and used for analyses. Genome-wide association studies, including a sib-transmission disequilibrium test and a case-control association analysis, and homozygosity mapping, identified a critical region on cat chromosome A3."

Molecular basis: Yu et al. (2020): "Short-read whole genome sequencing was completed for a cat trio segregating with the syndrome. A homozygous 7 bp deletion in growth differentiation factor 7 (GDF7) (c.221_227delGCCGCGC [p.Arg74Profs]) was identified in affected cats, by comparison to the 99 Lives Cat variant dataset, validated using Sanger sequencing and genotyped by fragment analyses. . . . The variant segregated concordantly in an extended pedigree."

Clinical features: "Ventriculomegaly with frequent concomitant supratentorial interhemispheric, communicating ventricular type-1b cysts and multiple midline and callosal malformations were detected in all cats displaying neurologic signs" (Keating et al., 2016)

Prevalence: Yu et al. (2020): "This variant was not identified in 192 unaffected cats in the 99 Lives dataset."

Breed: Toyger.

Associated gene:

Symbol Description Species Chr Location OMIA gene details page Other Links
GDF7 growth differentiation factor 7 Felis catus NC_018725.2 (124737756..124732610) GDF7 Homologene, Ensembl, NCBI gene

Variants

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WARNING! Inclusion of a variant in this table does not automatically mean that it should be used for DNA testing. Anyone contemplating the use of any of these variants for DNA testing should examine critically the relevant evidence (especially in breeds other than the breed in which the variant was first described). If it is decided to proceed, the location and orientation of the variant sequence should be checked very carefully.

Since October 2021, OMIA includes a semiautomated lift-over pipeline to facilitate updates of genomic positions to a recent reference genome position. These changes to genomic positions are not always reflected in the ‘acknowledgements’ or ‘verbal description’ fields in this table.

OMIA Variant ID Breed(s) Variant Phenotype Gene Allele Type of Variant Source of Genetic Variant Reference Sequence Chr. g. or m. c. or n. p. Verbal Description EVA ID Inferred EVA rsID Year Published PubMed ID(s) Acknowledgements
1221 Toyger Holoprosencephaly GDF7 deletion, small (<=20) Naturally occurring variant Felis_catus_9.0 A3 g.127002233_127002239del c.221_227del p.(R74Pfs*17) XM_023252074.1; XP_023107842.1; published as "a 7 bp deletion in the coding region of GDF7 (c.221_227delGCCGCGC [p.Arg74Profs*17]) at the position A3:127002233 (ENSFCAT00000063603)" (Yu et al., 2020) 2020 32575532

References


Note: the references are listed in reverse chronological order (from the most recent year to the earliest year), and alphabetically by first author within a year.
2021 Rodney, A.R., Buckley, R.M., Fulton, R.S., Fronick, C., Richmond, T., Helps, C.R., Pantke, P., Trent, D.J., Vernau, K.M., Munday, J.S., Lewin, A.C., Middleton, R., Lyons, L.A., Warren, W.C. :
A domestic cat whole exome sequencing resource for trait discovery. Sci Rep 11:7159, 2021. Pubmed reference: 33785770. DOI: 10.1038/s41598-021-86200-7.
2020 Lyons, L.A. :
Precision medicine in cats-The right biomedical model may not be the mouse! PLoS Genet 16:e1009177, 2020. Pubmed reference: 33290388. DOI: 10.1371/journal.pgen.1009177.
Yu, Y., Creighton, E.K., Buckley, R.M., Lyons, L.A. :
A deletion in GDF7 is associated with a heritable forebrain commissural malformation concurrent with ventriculomegaly and interhemispheric cysts in cats. Genes (Basel) 11:, 2020. Pubmed reference: 32575532. DOI: 10.3390/genes11060672.
2016 Keating, M.K., Sturges, B.K., Sisó, S., Wisner, E.R., Creighton, E.K., Lyons, L.A. :
Characterization of an inherited neurologic syndrome in Toyger cats with forebrain commissural malformations, ventriculomegaly and interhemispheric cysts. J Vet Intern Med 30:617-26, 2016. Pubmed reference: 26846816. DOI: 10.1111/jvim.13836.

Edit History


  • Created by Imke Tammen2 on 11 Jul 2021
  • Changed by Imke Tammen2 on 11 Jul 2021