TY - JOUR
T1 - Mutations in the XPD gene leading to xeroderma pigmentosum symptoms
AU - Kobayashi, Takehiro
AU - Kuraoka, Isao
AU - Saijo, Masafumi
AU - Nakatsu, Yoshimichi
AU - Tanaka, Akemi
AU - Someda, Yukiko
AU - Fukuro, Shuhei
AU - Tanaka, Kiyoji
PY - 1997
Y1 - 1997
N2 - XP is sun-sensitive and cancer-prone genetic disorder, consisting of eight (group A-G) genetically distinct complementation groups. Some XP group D patients exhibit clinical symptoms of other genetic disorders, CS, and TTD. The XP group D gene (XPD gene) product is required for nucleotide excision repair and is one of the components of basal transcription factor TFIIH as well. Therefore, different mutations in the XPD gene may result in a variety of clinical manifestations. Here we report on two causative mutations of the XPD gene in XP61OS, a Japanese XP group D patient who has only mild skin symptoms of XP without CS, TTD, or other neurological complications. One of the mutations was the 4-bp deletion at nucleotides 668-671, resulting in frameshift and truncation of the protein. The other was a nucleotide substitution leading to Ser-541 to Arg (S541R) in the helicase domain IV of the XPD protein. The patient's father was heterozygous for the 4-bp deletion, while the mother was heterozygous for the S541R mutation. Thus, the parents were obligate carriers of the XP-D trait. The expression study showed that the XPD cDNA containing the deletion or the S541R missense mutation failed to restore the UV sensitivity of XP6BE, group D XP cells, while the wild-type XPD cDNA restored it to the normal level. However, the transfectant expressing the XPD cDNA with the missense mutation was slightly more resistant than the parental XP6BE cells. These findings are consistent with the mild symptoms of the XP61OS patient.
AB - XP is sun-sensitive and cancer-prone genetic disorder, consisting of eight (group A-G) genetically distinct complementation groups. Some XP group D patients exhibit clinical symptoms of other genetic disorders, CS, and TTD. The XP group D gene (XPD gene) product is required for nucleotide excision repair and is one of the components of basal transcription factor TFIIH as well. Therefore, different mutations in the XPD gene may result in a variety of clinical manifestations. Here we report on two causative mutations of the XPD gene in XP61OS, a Japanese XP group D patient who has only mild skin symptoms of XP without CS, TTD, or other neurological complications. One of the mutations was the 4-bp deletion at nucleotides 668-671, resulting in frameshift and truncation of the protein. The other was a nucleotide substitution leading to Ser-541 to Arg (S541R) in the helicase domain IV of the XPD protein. The patient's father was heterozygous for the 4-bp deletion, while the mother was heterozygous for the S541R mutation. Thus, the parents were obligate carriers of the XP-D trait. The expression study showed that the XPD cDNA containing the deletion or the S541R missense mutation failed to restore the UV sensitivity of XP6BE, group D XP cells, while the wild-type XPD cDNA restored it to the normal level. However, the transfectant expressing the XPD cDNA with the missense mutation was slightly more resistant than the parental XP6BE cells. These findings are consistent with the mild symptoms of the XP61OS patient.
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U2 - 10.1002/(SICI)1098-1004(1997)9:4<322::AID-HUMU4>3.0.CO;2-7
DO - 10.1002/(SICI)1098-1004(1997)9:4<322::AID-HUMU4>3.0.CO;2-7
M3 - Article
C2 - 9101292
AN - SCOPUS:0030941231
VL - 9
SP - 322
EP - 331
JO - Human Mutation
JF - Human Mutation
SN - 1059-7794
IS - 4
ER -