[DOC] [TLE] Learning about Retinitis Pigmentosa - National Human Genome ... [PAR] NHGRI Clinical Research on Retinitis Pigmentosa; Additional Resources for ... 
Retinitis pigmentosa is an inherited disorder, and therefore not caused by ... But 
dominant genes and genes on the X chromosome also have been linked to 
retinitis pigmentosa. In these cases, only one parent has passed the disease 
gene. [DOC] [TLE] retinitis pigmentosa - Genetics Home Reference [PAR] Retinitis pigmentosa is a group of related eye disorders that cause progressive 
vision loss. These disorders affect the retina, which is the layer of light-sensitive 
tissue at ... Researchers have identified several major types of nonsyndromic 
retinitis ... pattern of inheritance: autosomal dominant, autosomal recessive, or X-
linked... [DOC] [TLE] Facts About Retinitis Pigmentosa | National Eye Institute [PAR] National Eye Institute, NIH, is dedicated to vision research that saves sight & 
reduces ... Retinitis pigmentosa (RP) is a group of rare, genetic disorders that 
involve a ... These signals are sent to other cells in the retina and ultimately 
through the ... Because females have two X chromosomes, the effect of a 
mutation on one X... [DOC] [TLE] Retinitis Pigmentosa - NORD (National Organization for Rare ... [PAR] The sudden onset of these same symptoms should point to a different cause, 
such as ... Causes. Retinitis pigmentosa is a group of hereditary progressive 
disorders that may ... Females who have a disease gene present on one X 
chromosome are .... RP have not been identified yet, but research is ongoing to 
discover them. [DOC] [TLE] Inheritance of Retinal Degenerations - Foundation Fighting Blindness [PAR] Retinitis pigmentosa (RP) is the name given to a group of retinal ... and males 
have one X chromosome and a different, smaller Y chromosome (Figure 4). ... 
caused by mutated genes that produce dominant or recessive diseases. ... often, 
families with an autosomal dominant retinal degeneration can trace the disease. [DOC] [TLE] Usher Syndrome - WellSpan Health [PAR] Researchers have identified three types of Usher syndrome and debated the 
existence of a fourth type. ... Retinitis pigmentosa eventually causes 
degeneration of the retina leading to ... In some cases, these main symptoms of 
Usher syndrome may be ... Since males only have one X chromosome, if they 
inherit a gene for a... [DOC] [TLE] Frequent questions about Usher syndrome [PAR] If a child has a mutation in one Usher syndrome gene but the other gene is 
normal, ... Type 2  causes a moderate hearing loss and balance is not affected. 
... Retinitis Pigmentosa (RP) is a disease of the retina cells in the eye that are .... 
Girls inherit two X chromosomes, whereas boys receive one X chromosome and 
one Y... [DOC] [TLE] X-Linked RP - California Optometric Association [PAR] He reported that these symptoms began at a young age and had been ... As 
males have only one X chromosome, if they have a gene mutation on ... At this 
time, there is no cure for any type of RP;however, research studies .... Phenotypic 
conservation in patients with X-linked retinitis pigmentosa caused by RPGR 
mutations. [DOC] [TLE] Research Reports to April 2012 - of RP Fighting Blindness [PAR] CHARACTERISING THE X-LINKED RETINITIS PIGMENTOSA. PROTEIN .... 
degenerations and prospects for the treatment of these disorders. Annu Rev ... 
Mutations in the RP2 gene on the X-chromosome cause a severe form of retinitis 
..... affected by mutations at the RP11 locus have lost one copy of the gene, 
resulting in. [DOC] [TLE] Identification of novel mutations in X-linked retinitis pigmentosa ... [PAR] Identification of novel mutations in X-linked retinitis pigmentosa families and ... 
This study included 141 RP families with possible X-chromosomal ... most 
frequent cause of RP in families with an X-chromosomal inheritance pattern. .... 
Additional loci on the X-chromosome have ...... In one of these six families (index 
patient. [DOC] [TLE] Chapter 7. Vision: From Eye to Brain - Biological Psychology [PAR] The research team focused on a group of eye diseases called retinitis 
pigmentosa, in which cells in the retina break down over time, causing ... The 
amount of zinc, a trace

Question: Researchers have traced a cause of retinitis pigmentosa to one of these on the X chromosome
Answer: Gene