Paula and Bobby
Parents of Lillie
Birk-Barel Mental Retardation Dysmorphism syndrome
What is Birk-Barel Mental Retardation Dysmorphism syndrome?
Also known as KCNK9 imprinting syndrome, this rare genetic condition has currently been diagnosed in just 19 individuals worldwide, to date.
Developmental delay, intellectual disability, and unique facial features are main symptoms of the syndrome.
What gene changes cause Birk-Barel Mental Retardation Dysmorphism syndrome?
Mutations to the KCNK9 gene are responsible for the syndrome. The condition is inherited in an autosomal dominant pattern, although up to 20% of cases are believed to be de novo or new mutations.
Due to genomic imprinting only the KCNK9 gene from the mother is active, the one passed on from the father is inactive, meaning father’s can not pass on the condition.
In the case of autosomal dominant inheritance just one parent is the carrier of the gene mutation, and they have a 50% chance of passing it onto each of their children. Syndromes inherited in an autosomal dominant inheritance are caused by just one copy of the gene mutation.
In some cases, a genetic syndrome may be the result of a de-novo mutation and the first case in a family. In this case, this is a new gene mutation which occurs during the reproductive process.
What are the main symptoms of Birk-Barel Mental Retardation Dysmorphism syndrome?
Symptoms of the syndrome can present as early as infancy. Babies with the syndrome are often lethargic, have a weak cry and move much less than average.
Some infants with the condition, due to facial weakness, suffer from feeding problems, usually related to the ability to swallow, and this leads to a failure to thrive and grow properly.
Serious symptoms associated with the syndrome include intellectual disability, developmental delay and limited speech development.
Unique facial features of the condition include a tended lip, small lower jaw, and a cleft palate. Abnormally shaped eyebrows, an outward pointing lip and a long face that narrows at the temple are all features of the syndrome.
Other physical conditions related to the syndrome include a long neck, narrow chest, scoliosis. and contractures or a permanent bending of the joints.
How does someone get tested for Birk-Barel Mental Retardation Dysmorphism syndrome?
The initial testing for Birk Barel syndrome can begin with facial analysis screening, through the FDNA Telehealth telegenetics platform, which can identify the key markers of the syndrome and outline the need for further testing. A consultation with a genetic counselor and then a geneticist will follow.
Based on this clinical consultation with a geneticist, the different options for genetic testing will be shared and consent will be sought for further testing.
What is FDNA Telehealth?
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