RT Journal Article
SR Electronic
T1 A survey of (CAG)n repeats causing juvenile Huntington disease in an Iranian family with 4 affected members
JF Neurosciences Journal
JO Neurosciences (Riyadh)
FD Prince Sultan Military Medical City
SP 273
OP 276
VO 14
IS 3
A1 Mazdeh, Mehrdokht
A1 Pour-Jafari, Hamid
A1 Ghaleiha, Ali
A1 Pour-Jafari, Bita
YR 2009
UL http://nsj.org.sa/content/14/3/273.abstract
AB Huntington’s disease is caused by a trinucleotide repeat expansion (CAG)n in the gene coding for Huntingtin (Htt) and is one of the several polyglutamine diseases. Its physical symptoms occur in a large range of ages, with a mean occurrence in a person’s late 40’s and early 50’s. Almost all references indicated that if the age of onset is below 20 years then it is known as juvenile HD. Our case was an Iranian family with 4 affected siblings (2 sisters and 2 brothers). In addition to 4 affected children, they had 5 normal male progenies. There was no any other case in their family history. The onset age of the disease in our case family was 20 to 25 years. Their parents were unaffected and nonconsanguineous. Analysis of the pathogenic (CAG)n repeat region of the HD gene for the affected members have showed an expansion allele with 46, 50, 46, and 44 repeats in 4 affected siblings. Our results indicated that the age of 20 years maybe is not a stable limit point for all cases of juvenile HD, and perhaps onset ages are related with the CAG repeat sizes in such individuals.