Abstract:
Two male patients with bifid rib-basal cell nevus-jaw cyst syndrome (BCNS) were admitted to Department of Stomatology, the First Affiliated Hospital of Bengbu Medical College due to radiological findings of multiple low density shadows in the jaw. Clinical and imaging findings showed thoracic malformation, calcification of the tentorium cerebellum and falx cerebrum as well as widening of the orbital distance. Whole exon high-throughput sequencing was performed in two patients and their family members. The heterozygous mutations of c.C2541C>A(p.Y847X) and c.C1501C>T(p.Q501X) in PTCH1 gene were detected in both patients. Diagnosis of BCNS was confirmed. The heterozygous mutations of PTCH1 gene locus were also found in the mothers of the two probands. Proband 1 showed clinical manifestations of low intelligence, and heterozygous mutations of c.C2141T(p.P714L) and c.G3343A(p.V1115I) were detected in FANCD2 gene. Proband 2 had normal intelligence and no FANCD2 mutation. The fenestration decompression and curettage of jaw cyst were performed in both patients. Regular follow-up showed good bone growth at the original lesion, and no recurrence has been observed so far.
两家系肋骨分叉-基底细胞痣-颌骨囊肿综合征先证者均为男性,因X线摄片见颌骨多发低密度影就诊,临床及影像学检查见胸廓畸形、小脑幕及大脑镰钙化、眶距增宽等表现。两例先证者分别检出PTCH1基因位点的c.C2541C>A(p.Y847X)和c.C1501C>T(p.Q501X)杂合突变,对比先证者及其家系相关成员基因序列,结果两例先证者的母亲外周血中均检出PTCH1基因位点的杂合突变,明确该突变均来源于母亲。其中一例先证者临床表现为智力低下,还检出FANCD2基因位点的c.C2141T(p.P714L)和c.G3343A(p.V1115I)杂合突变;另一例先证者智力正常,未发现FANCD2基因突变。两例先证者均行颌骨囊肿开窗减压联合刮治术,随访原病灶处骨质生长状况良好,至今均未见复发。.