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Nicolaides–Baraitser Syndrome
Nicolaides–Baraitser syndrome (NCBRS) is a rare genetic condition caused by de novo mutation, de novo missense mutations in the SMARCA2 gene and has only been reported in fewer than 200 cases worldwide. NCBRS is a distinct condition and well recognizable once the symptoms have been identified. The differential includes Coffin–Siris syndrome. Symptoms The most common symptoms of Nicolaides–Baraitser syndrome are mild to severe developmental delays with absent or limited speech, seizures, short stature, sparse hair, typical facial characteristics, brachydactyly, and prominent finger joints and broad distal phalanges. Major Features of NCBRS * Mild prenatal growth retardation * Moderate postnatal growth retardation * Mild to severe developmental delay * Severely impaired speech * Seizures *Microcephaly * Sparse hair * Progressive skin wrinkling * Thick, anteverted alae nasi * Long and broad philtrum * Large mouth * Thin upper and thick lower Vermilion border, vermilion * Prog ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
De Novo Mutation
A de novo mutation is any mutation/alteration in the genome of any organism (humans, animals, plant, microbes, etc.) that wasn't present or transmitted by their parents. This type of mutation (like any other) occurs spontaneously during the process of DNA replication during cell division in a fetus whose close, biological relatives don't have the mutation. Often, these kind of mutations have very little to no effect on the affected organism, but in rare cases they have a notable and/or serious effect on overall health, physical appearance, etc. Rate The average number of spontaneous mutations (not present in the parents) an infant has in its genome is approximately 43.86 DNMs. A study done in September of 2019 by the University of Utah Health revealed that certain families have a higher spontaneous mutation rate than average, meaning that their newborns had more spontaneous mutations (not present in their parents) than the average newborn, this tendency was found to be hereditar ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
