TY - JOUR
T1 - Retinoblastoma - clinical and genetic aspects
T2 - A review
AU - Cowell, J. K.
AU - Hungerford, J.
AU - Jay, M.
AU - Rutland, P.
PY - 1988
Y1 - 1988
N2 - At present, therefore, it is possible to diagnose chromosome deletion carriers using ESD quantitation and also to follow the inheritance of the predisposition to Rb in a proportion of families. We have recently shown that both quantitative and qualitative analysis of the ESD enzyme can be carried out on samples derived from the chorionic villus (CV)12 as well as cultured CV samples. The CV tissue is produced by the fetus and destined to become the placenta. Most importantly, CV samples can be obtained in the first trimester of pregnancy, after only 6-8 weeks. Thus, a diagnosis can be made early in pregnancy compared with the 18-20 weeks which must elapse before fetal blood samples can be taken. The same CV samples could be used to prepare DNA which can be used for carrier detection using DNA probes as described above. We are, therefore, moving rapidly towards the time when it will be possible to offer prenatal diagnosis to all familial cases of Rb. A remaining challenge will be to determine the nature of the genetic changes which occur within the Rb predisposition gene leading to abnormal development of the retina and consequently tumour development. It may then be possible to determine whether isolated cases of Rb are truly sporadic or the beginning of a new hereditary line.
AB - At present, therefore, it is possible to diagnose chromosome deletion carriers using ESD quantitation and also to follow the inheritance of the predisposition to Rb in a proportion of families. We have recently shown that both quantitative and qualitative analysis of the ESD enzyme can be carried out on samples derived from the chorionic villus (CV)12 as well as cultured CV samples. The CV tissue is produced by the fetus and destined to become the placenta. Most importantly, CV samples can be obtained in the first trimester of pregnancy, after only 6-8 weeks. Thus, a diagnosis can be made early in pregnancy compared with the 18-20 weeks which must elapse before fetal blood samples can be taken. The same CV samples could be used to prepare DNA which can be used for carrier detection using DNA probes as described above. We are, therefore, moving rapidly towards the time when it will be possible to offer prenatal diagnosis to all familial cases of Rb. A remaining challenge will be to determine the nature of the genetic changes which occur within the Rb predisposition gene leading to abnormal development of the retina and consequently tumour development. It may then be possible to determine whether isolated cases of Rb are truly sporadic or the beginning of a new hereditary line.
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U2 - 10.1177/014107688808100412
DO - 10.1177/014107688808100412
M3 - Review article
C2 - 3286867
AN - SCOPUS:0023896691
SN - 0141-0768
VL - 81
SP - 220
EP - 223
JO - Journal of the Royal Society of Medicine
JF - Journal of the Royal Society of Medicine
IS - 4
ER -