A rare genetic variant which causes reduced levels of vitamin D appears to be directly linked to multiple sclerosis, says an Oxford University study.

UK and Canadian scientists identified the mutated gene in 35 parents of a child with MS and, in each case, the child inherited it.

Researchers say this adds weight to suggestions of a link between vitamin D deficiency and MS.

The study is in Annals of Neurology.

Multiple sclerosis is an inflammatory disease of the central nervous system (the brain and spinal cord).

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