F8 gene inversion and duplication cause no obvious hemophilia A phenotype

被引:0
作者
Li, Shaoying [1 ]
He, Jianchun [1 ]
Chu, Liming [2 ]
Ren, Shuai [2 ]
He, Wenzhi [1 ]
Ma, Xiaoyan [1 ]
Wang, Yanchao [1 ]
Zhang, Mincong [1 ]
Kong, Lingyin [2 ]
Liang, Bo [3 ]
Li, Qing [1 ]
机构
[1] Guangzhou Med Univ, Dept Obstet & Gynecol, Expt Dept Inst Obstet & Gynecol, Key Lab Major Obstetr Dis Guangdong Prov,Affiliat, Guangzhou, Peoples R China
[2] Basecare Med Device Co Ltd, Suzhou, Peoples R China
[3] Shanghai Jiao Tong Univ, Sch Life Sci & Biotechnol, State Key Lab Microbial Metab, Joint Int Res Lab Metab & Dev Sci, Shanghai, Peoples R China
关键词
F8; hemophilia A; intron; 22; inversion; duplication; C1qA; FACTOR-VIII GENE; C1Q; COMPLEMENT; INHIBITOR; MUTATIONS; REGIONS; LIFE;
D O I
10.3389/fgene.2023.1098795
中图分类号
Q3 [遗传学];
学科分类号
071007 ; 090102 ;
摘要
Hemophilia A (HA, OMIM#306700) is an X-linked recessive bleeding disorder caused by the defects in the F8 gene, which encodes coagulation factor VIII (FVIII). Intron 22 inversion (Inv22) is found in about 45% of patients with severe hemophilia A. Here, we reported a male without obvious hemophilia A phenotype but bearing an inherited segmental variant duplication encompassing F8 as well as Inv22. The duplication was approximately 0.16 Mb and involved from exon 1 to intron 22 of F8. This partial duplication and Inv22 in F8 was first found in the abortion tissue of his older sister with recurrent miscarriage. The genetic testing of his family revealed that his phenotypically normal older sister and mother also had this heterozygous Inv22 and a 0.16 Mb partial duplication of F8, while his father was genotypically normal. The integrity of the F8 gene transcript was verified by sequencing of the adjacent exons at the inversion breakpoint, which explained why this male had no phenotype for hemophilia A. Interestingly, although he had no significant hemophilia A phenotype, the expression of C1QA in his mother, sister, and the male subject was only about half of that in his father and normal population. Our report broadens the mutation spectrum of F8 inversion and duplication and its pathogenicity in hemophilia A.
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页数:8
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