[A family with nanophthalmos caused by a TMEM98 gene variant]

A family with nanophthalmos was genetically investigated. The proband of this family was a 34-year-old male, who was diagnosed as binocular glaucoma two years ago and was admitted to Beijing Tongren Eye Center due to impaired vision in his right eye for 2 months. The intraocular pressure was controlled with two anti-glaucoma medications, the range of the angle closure was300 degrees, and the cup-disk ratio was significantly increased in both eyes. The axial length of the right and left eyes was 17.45 mm and 17.36 mm, respectively. A heterozygous missense variant of the TMEM98 gene was detected by gene sequencing (C. 602GC, P.R201p). Both eyes were diagnosed with nanophthalmos and secondary angle-closure glaucoma. The father of the proband was found to carry a homozygous variant in the same gene, while the daughter of the proband carried the same heterozygous variant as the proband. Both of them were diagnosed as binocular nanophthalmos in combination with clinical manifestations.先证者为34岁右眼视力下降2个月男性患者，双眼青光眼2年，双眼眼压在正常范围（使用2种抗青光眼药物），双眼房角关闭范围300°，双眼视杯视盘直径比明显增大，眼轴长度右眼为17.45 mm，左眼为17.36 mm，基因测序检出TMEM98基因杂合错义突变（c.602GC，p.R201P），诊断为双眼真性小眼球和双眼继发性闭角型青光眼。家系中发现先证者父亲携带相同基因纯合错义突变，先证者女儿携带与先证者相同基因杂合错义突变，综合临床表现均诊断为双眼真性小眼球。.