Search results
Results From The WOW.Com Content Network
MIND institute has a major focus on studying neurodevelopmental disorders caused by genetic instability, e.g. fragile X syndrome. Randi J. Hagerman and Paul J. Hagerman have been studying genotype-phenotype correlations in fragile X and potential discovery of targeted treatment. [2] [3]
Fragile X syndrome (FXS) is a genetic neurodevelopmental disorder characterized by mild-to-moderate intellectual disability. [1] The average IQ in males with FXS is under 55, while about two thirds of affected females are intellectually disabled.
Early reports were split on the topic of whether ring chromosome 22 constituted a consistent syndrome or simply a finding in a heterogeneous group of intellectually disabled people. [14] One early case that drew attention to the syndrome was a report of monozygotic twin sisters with a ring 22, one of the first recorded reports of a shared ...
46,XX/46,XY chimeric or mosaic is associated with a wide spectrum of different physical presentations, with cases ranging from having a completely normal male or female phenotype [7] [8] [9] to some cases having ovotesticular syndrome. Due to this variation, genetic testing is the only way to reliably make a diagnosis. [11] [12] [13] [6]
Fragile X-associated tremor/ataxia syndrome (FXTAS) is a late-onset neurodegenerative disorder most frequently seen in male premutation carriers of Fragile X syndrome (FXS) over the age of 50. [ 4 ] [ 5 ] The main clinical features of FXTAS include problems of movement with cerebellar gait ataxia and action tremor .
Females with one affected X chromosome and one normal X chromosome tend to have milder symptoms. Unlike many other types of intellectual disability, the genetics of these conditions are relatively well understood. [2] [3] It has been estimated there are ~200 genes involved in this syndrome; of these ~100 have been identified. [4]
Along with her husband Paul Hagerman, she discovered the Fragile X-associated tremor/ataxia syndrome (FXTAS), a neurological disorder that affects older male and rare female carriers of fragile X. [3] [4] She was recognized on a list of the world's top female scientists [5]
[2] 45,X/46,XY is diagnosed by examining the chromosomes in a blood sample. The age of diagnosis varies depending on manifestations of disease prompting reason for cytogenetic testing. Many patients are diagnosed prenatally due to fetal factors (increased nuchal fold, or abnormal levels of serum ), maternal age or abnormal ultrasounds, while ...