What is PVNH

PVNH Support & Awareness – the international neuronal heterotopia disorders community from Australia to the USA and every country in between – presents             World PVNH Day August 7th!!

Wear pink and / yellow clothing or accessories and share your photos @PVNHsupport on Instagram and Twitter using  ‪#‎PVNHDay‬. You can also join World PVNH Disorder Day on Facebook. Huge thanks to the UK’s Emirates Spinnaker Tower for lighting pink on our very big day and to Vancouver’s BC Place in Canada for lighting pink and yellow! 

Spinnaker Tower                                               BC Place

Spinnaker Tower, PVNH Day 2015 by Simon Winson                                               Photo credit: BC Place

Photo credit : Simon Winson                                 Photo credit : BC Place

Periventricular nodular heterotopia (PVNH) is a rare neurological disorder, described in the medical litterature as a neuronal migration disorder. It is  characterized by the presence of nodules of neurons (gray matter) in the wrong spot, specifically along the lateral ventricles instead of properly migrating to the cortex. It can also be referred to as BPH, BPNH, PNH or grey matter heterotopia.

World PVNH Disorder Awareness Day is celebrated on August 7. It was created by Ella’s Mom and founder of PVNH Support & Awareness, Yolaine Dupont, after Ella passed away from PVNH in 2009.

The incidence of PVNH is unknown, and about 50% of occurences are genetically linked to the X-chromosome. The other 50% are thought to be spontaneous mutations. The genetic forms of PVNH are caused by mutation or deletion of one of the following genes: FLNA or ARFGEF2 or ERMARD.

It is estimated that about 80%-90% of individuals affected by PVNH will suffer from seizures. It can also cause cognitive and motor issues, cardiovascular problems, lung disorder, gastrointestinal issues and psychiatric disorder.

There appears to be 5 different distinguisable types of periventricular nodular heterotopia:

(1) bilateral and symmetrical;

(2) bilateral single-noduled;

(3) bilateral and asymmetrical - x-linked, with a female predominance and known familial cases of epilepsy. This form of PVNH is associated with the Xq28 chromosome and caused by a mutation in the Filamin A  or 1 (FLNA) gene. Recent findings have demonstrated it is also associated with PVNH4 (PVNH with Ehlers Danlos variant) - the very form of PVNH my family is affected by.  Medical reports allege that males show early lethality (in utero or soon after birth) although cases of FLNA mutations have been reported in boys (some showing mild symptoms and others very severe).

(4) unilateral: this form is not reported to have sex or familial prevalence it appears.

and (5) unilateral with extension to neocortex.

Generally, females present with seizures which appear at the average age of 14-15 years and the disease includes an increased risk for stroke and other vascular/coagulation problems. Intellectual delays are sometimes present as well as motor delays or physical impairments such as short digits.

It is important to note that people can have PVNH and have normal intelligence and live well.

PVNH can also be associated with other disorders such as Ehlers-Danlos syndrome, De Morsier syndrome, Williams syndrome.

To find out more about PVNH, visit the dedicated page on the Genetics Home Reference’s site (laymen’s term) or the one on the National Center for Biotechnology Information‘ site (more technical information).