OMIA:000698-89462 : Myotonia in Bubalus bubalis (water buffalo)

In other species: dog , domestic cat , horse , pig , taurine cattle , goat , sheep

Categories: Muscle phene

Links to possible relevant human trait(s) and/or gene(s) in OMIM: 160800 (trait) , 255700 (trait) , 118425 (gene)

Mendelian trait/disorder: yes

Mode of inheritance: Autosomal recessive

Considered a defect: yes

Key variant known: yes

Year key variant first reported: 2013

Cross-species summary: Myotonia congenita

History: This disorder was first recorded in water buffalo by Borges et al. (2013), who reported on "Eleven clinically affected Murrah buffalo of both sexes (7 females and 4 males) ranging in age from 1 day to 8 years obtained from herds in the states of São Paulo and Pará in Brazil".

Molecular basis: By cloning and sequencing the most likely comparative candidate gene (namely CLCN1, based on similarity of clinical signs across species), Borges et al. (2013) showed that this disorder in Murrah buffalo is due to a SNP in exon 3 (c.396C>T) which creates a "splice donor site located at nucleotides 90–91 of exon-3. The predicted impact of this aberrant splicing event is the alteration of the CLCN1 translational reading frame, which results in the incorporation of 24 unrelated amino acids followed by a premature stop codon."

Clinical features: As described by Borges et al. (2013) "The affected animals exhibited muscle hypertrophy and stiffness. Myotonic discharges were observed during EMG, and dystrophic changes were not present in skeletal muscle biopsies".

Breed: Murrah (Buffalo) (VBO_0000076).
Breeds in which the phene has been documented. (If a likely causal variant has been documented for the phene, see the variant table breeds in which the variant has been reported).

Associated gene:

Symbol Description Species Chr Location OMIA gene details page Other Links
CLCN1 chloride channel, voltage-sensitive 1 Bubalus bubalis 8 NC_059164.1 (106262091..106301056) CLCN1 Homologene, Ensembl , NCBI gene


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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 Year Published PubMed ID(s) Acknowledgements
399 Murrah (Buffalo) Myotonia CLCN1 splicing Naturally occurring variant c.396C>T 2013 23339992

Cite this entry

Nicholas, F. W., Tammen, I., & Sydney Informatics Hub. (2013). OMIA:000698-89462: Online Mendelian Inheritance in Animals (OMIA) [dataset].


2013 Borges, A.S., Barbosa, J.D., Resende, L.A., Mota, L.S., Amorim, R.M., Carvalho, T.L., Garcia, J.F., Oliveira-Filho, J.P., Oliveira, C.M., Souza, J.E., Winand, N.J. :
Clinical and molecular study of a new form of hereditary myotonia in Murrah water buffalo. Neuromuscul Disord 23:206-13, 2013. Pubmed reference: 23339992. DOI: 10.1016/j.nmd.2012.11.008.

Edit History

  • Created by Frank Nicholas on 17 Aug 2013
  • Changed by Frank Nicholas on 17 Aug 2013