PNPLA6
PNPLA6 is a phospholipase that deacetylates intracellular phosphatidylcholine to produce glycerophosphocholine. It is thought to function in neurite outgrowth and process elongation during neuronal differentiation. The protein is anchored to the cytoplasmic face of the endoplasmic reticulum in both neurons and non-neuronal cells. Mutations in this gene result in autosomal recessive spastic paraplegia, and the protein is the target for neurodegeneration induced by organophosphorus compounds and chemical warfare agents.
Function
Phospholipase B that deacylates intracellular phosphatidylcholine (PtdCho), generating glycerophosphocholine (GroPtdCho). This deacylation occurs at both sn-2 and sn-1 positions of PtdCho. Catalyzes the hydrolysis of several naturally occurring membrane-associated lipids (PubMed:11927584).
Hydrolyzes lysophospholipids and monoacylglycerols, preferring the 1-acyl to the 2-acyl isomer. Does not catalyze hydrolysis of di- or triacylglycerols or fatty acid amides (PubMed:11927584).
Involvement in disease
Spastic paraplegia 39, autosomal recessive (SPG39):
A form of spastic paraplegia, a neurodegenerative disorder characterized by a slow, gradual, progressive weakness and spasticity of the lower limbs. Rate of progression and the severity of symptoms are quite variable. Initial symptoms may include difficulty with balance, weakness and stiffness in the legs, muscle spasms, and dragging the toes when walking. In some forms of the disorder, bladder symptoms (such as incontinence) may appear, or the weakness and stiffness may spread to other parts of the body. SPG39 is associated with a motor axonopathy affecting upper and lower limbs and resulting in progressive wasting of distal upper and lower extremity muscles.
Boucher-Neuhauser syndrome (BNHS):
An autosomal recessive disorder characterized by spinocerebellar ataxia, hypogonadotropic hypogonadism, and visual impairment due to chorioretinal dystrophy. The age at onset is variable, but most patients develop 1 or more symptoms in the first decade of life. Chorioretinal dystrophy may not always be present.
Laurence-Moon syndrome (LNMS):
An autosomal recessive syndrome characterized by progressive spinocerebellar degeneration, spastic paraplegia, intellectual disability, hypogonadism, dwarfism, and chorioretinopathy. Trichomegaly is absent.
Oliver-McFarlane syndrome (OMCS):
A rare autosomal recessive, congenital syndrome characterized by trichomegaly, severe chorioretinal atrophy and multiple pituitary hormone deficiencies. It results in intellectual impairment and dwarfism, if untreated. Clinical features include hypogonadotropic hypogonadism during puberty, pigmentary retinal degeneration, ataxia, spastic paraplegia, and peripheral neuropathy.
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