OBJECTIVE: To detect gene inversion in two pedigrees affected with Hemophilia A by using Nanopore sequencing technology. METHODS: Peripheral blood samples were taken from members of the two pedigrees. Following extraction of genome DNA, genetic variants of the carriers were detected by Nanopore sequencing and subjected to bioinformatic analysis. RESULTS: Nanopore sequencing has identified the niece of the proband of the pedigree 1 as carrier of Hemophilia A Inv22, and the mother of the proband of the pedigree 2 as carrier of Hemophilia A Inv1, which was consistent with clinical findings. Breakpoint sites in both pedigrees were accurately mapped. Statistical analysis of the sequencing results revealed a large number of variations in the carriers' genomes including deletions, duplications, insertions, inversions and translocations. CONCLUSION Nanopore sequencing can be used to analyze gene inversions associated with Hemophilia A, which also provided a powerful tool for the diagnosis of diseases caused by gene inversions.
Chromosome Inversion/genetics* ; Hemophilia A/genetics* ; Humans ; Introns ; Nanopore Sequencing ; Pedigree

OBJECTIVEInversions of intron 1 (Inv1) or intron 22 (Inv22) of the coagulation factor VIII gene (F8) may be found in 40%-50% of patients with severe hemophilia A. Such inversions cannot be detected by conventional sequencing. Due to homologous recombination, family-based linkage analysis may yield false positive or false negative results. In this study, Inverse-shifting PCR (IS-PCR) was used to detect potential inversions in two families affected with hemophilia A.

METHODSPeripheral venous blood, fetal amniotic fluid and fetal chorionic cells were harvested for genome DNA extraction. IS-PCR was used to detect Inv1 or Inv22 detection or its subtypes.

RESULTSIS-PCR has accurately detected Inv22 and Inv1 in both families and verified the subtypes of Inv22.

CONCLUSIONCarriers of Inv22 or Inv1 may be precisely detected with IS-PCR. The results have provided valuable information for genetic counseling and prenatal diagnosis for the affected families.

Child ; Chromosome Inversion ; Factor VIII ; genetics ; Genetic Counseling ; Hemophilia A ; diagnosis ; genetics ; Humans ; Introns ; Male ; Prenatal Diagnosis

OBJECTIVETo analyze intron 1 and 22 inversions in factor VIII (FVIII) gene in hemophilia A (HA) patients and and their families and to investigate the correlation between intron inversion and FVIII antibody.

METHODSAll patients were detected FVIII: C and FVIII antibody. In addition, 81 unrelated HA patients were directly detected by multiplex PCR and long-distance PCR for intron 1 and 22 inversions in FVIII gene. Pedigree investigation for some patients were conducted.

RESULTSIn 81 unrelated HA patients, 3 severe cases were found intron 1 inversion which accounted for 4.6% of total 65 severe cases. Of the 3 cases, one was FVIII antibody positive. Two female family members of a intron 1 inversion patient were identified as one carrier and one non-carrier. Twenty five of 65 (38.5%) severe cases were found intron 22 inversion. Of the 25 cases 1 was FVIII antibody positive. Nine female members in 5 HA families which had patients with intron 22 inversion were identified as 7 carries and 2 non-carriers.

CONCLUSIONBesides intron 22 inversion, intron 1 inversion was another important molecular defect in resulting in severe HA. Intron inversion analysis can also be used for deviation rectification of experiment grouping in HA patients. Intron 1 and 22 inversions may be one of the higher risk factors for resulting in FVIII antibodies.

Chromosome Inversion ; Chromosomes, Human, X ; Factor VIII ; genetics ; Female ; Hemophilia A ; genetics ; Humans ; Introns ; Male

OBJECTIVE: To analyze the prognostic factors of AML children with CBFβ/MYH11 positive. METHODS: Twenty-eight children with CBFβ/MYH11 positive treated in our hospital from May 2012 to June 2018 were selected, the clinical data and curative were analyzed and evaluated. RESULTS: Five-year OS and 5-year EFS rate of CBFβ/MYH11 positive AML children was 76.8% and 64.0% efficacy, respectively. Univariate analysis results showed that the OS rate of CBFβ/MYH11 positive AML children with WBC<60.0×10 CONCLUSION WBC level and XRCC-Thr241Met genotype at initial diagnosis are the major affecting factors for prognosis of AML children with CBFβ/MYH11 positive.
Child ; Chromosome Inversion ; Genotype ; Humans ; Leukemia, Myeloid, Acute/genetics* ; Myosin Heavy Chains ; Oncogene Proteins, Fusion ; Prognosis

PURPOSE: The pericentric inversion of chromosome 9 is one of the most common structural balanced chromosomal variations and has been found in both normal populations and patients with various abnormal phenotypes and diseases. The aim of this study was to re-evaluate the clinical impact of inv(9)(p11q13). MATERIALS AND METHODS: We studied the karyotypes of 431 neonates with congenital anomalies at the Pediatric Clinic in Ajou University Hospital between 2004 and 2008 and retrospectively reviewed their clinical data. RESULTS: Chromosomal aberrations were detected in 60 patients (13.9%). The most common type of structural abnormality was inv(9)(p11q13), found in eight patients. Clinical investigation revealed that all eight cases with inv(9)(p11q13) had various congenital anomalies including: polydactyly, club foot, microtia, deafness, asymmetric face, giant Meckel's diverticulum, duodenal diaphragm, small bowel malrotation, pulmonary stenosis, cardiomyopathy, arrhythmia, and intrauterine growth restriction. The cytogenetic analysis of parents showed that all of the cases were de novo heterozygous inv(9)(p11q13). CONCLUSION: Since our results indicate that the incidence of inv(9)(p11q13) in patients with congenital anomalies was not significantly different from the normal population, inv(9)(p11q13) does not appear to be pathogenic with regard to the congenital anomalies. Some other, to date unknown, causes of the anomalies remain to be identified.
Adult ; Chromosome Inversion/*genetics ; Chromosomes, Human, Pair 9/*genetics ; Congenital Abnormalities/*genetics ; Female ; Humans ; Infant, Newborn ; Male ; Retrospective Studies

OBJECTIVETo improve inversion-polymerase chain reaction (I-PCR) in detection of factor VIII (FVIII) intron 22 inversion for gene diagnosis and prenatal diagnosis of hemophilia A (HA).

METHODSThe modified I-PCR was applied to detect FVIII intron 22 inversion in 8 families with HA. The prenatal diagnosis was performed for 2 pregnant women in the families. The fetal blood samples were obtained by cordocentesis at 22 and 26 weeks gestation respectively.

RESULTSFour of 8 HA families were diagnosed to be FVIII intron 22 inversion. Two fetuses were identified to be normal and one of them was born normal.

CONCLUSIONThe modified I-PCR enables the gene diagnosis and prenatal diagnosis of FVIII intron 22 inversion more accurately and rapidly.

Chromosome Inversion ; Factor VIII ; genetics ; Female ; Hemophilia A ; diagnosis ; genetics ; Humans ; Polymerase Chain Reaction ; methods ; Pregnancy ; Prenatal Diagnosis

OBJECTIVE: To summarize the clinical and laboratory characteristics of patients with acute myeloid leukemia (AML) with inv(16)/t(16;16) (p13.1;q22), and to analyze the risk factors affecting the prognosis of the patients. METHODS: AML patients with inv(16)/t(16;16) (p13.1;q22) and/or CBFβ-MYH11⁺ admitted to the Department of Hematology, The First Affiliated Hospital of Soochow University from January 1, 2008 to October 30, 2019 were retrospective analyzed, the clinical and laboratory indicators, as well as treatment plans and efficacy evaluations of the patients were all recorded. Furthermore, related factors affecting the overall survival (OS) and event-free survival (EFS) of the patients were analyzed. RESULTS: Among 151 AML patients with inv(16)/t(16;16) (p13.1;q22) and/or CBFβ-MYH11⁺, the percentage of additional chromosomal abnormalities was about 27.8%, and the most common additional chromosomal abnormality was +22 (33/151, 21.8%), followed by +8 (11/151, 7.3%). There were 112 patients with perfect NGS examination, and the result showed the most common accompanying gene mutations were KIT mutation (34/112, 30.4%) and FLT3 mutation (23/112, 20.5%). Univariate analysis showed that factors affecting EFS included: NE≤0.5×10⁹/L (P=0.006) and combined K-RAS mutation (P=0.002); Factors affecting OS included: Age≥50 years old (P<0.001) and NE≤0.5×10⁹/L (P=0.016). Multivariate analysis showed that NE≤0.5×10⁹/L (P=0.019) was the risk factors affecting OS. The proportion of bone marrow eosinophilia (BME)≥10.00% (P=0.029) was the risk factors affecting EFS. CONCLUSION The prognosis for those newly diagnosed AML patients who were of advanced age, the high proportion of bone marrow eosinophils, K-RAS mutations, and agranulocytosis is poor. The treatment plans can be adjusted in the early stage to improve the prognosis of such patients.
Chromosome Inversion ; Humans ; Leukemia, Myeloid, Acute/genetics* ; Middle Aged ; Myosin Heavy Chains/genetics* ; Oncogene Proteins, Fusion ; Prognosis ; Retrospective Studies

Pericentric inversion of chromosome 4 can give rise to 2 alternate recombinant (rec) chromosomesby duplication or deletion of 4p. The deletion of distal 4p manifests as Wolf-Hirschhorn syndrome (WHS). Here, we report the molecular cytogenetic findings and clinical manifestations observed in an infant with 46,XX,rec(4)dup(4q)inv(4)(p16q31.3)pat. The infant was delivered by Cesarean section at the 33rd week of gestation because pleural effusion and polyhydramnios were detected on ultrasonography. At birth, the infant showed no malformation or dysfunction, except for a preauricular skin tag. Array comparative genomic hybridization analysis of neonatal peripheral blood samples showed a gain of 38 Mb on 4q31.3-qter and a loss of 3 Mb on 4p16.3, and these results were consistent with WHS. At the last follow-up at 8 months of age (corrected age, 6 months), the infant had not achieved complete head control.
*Chromosome Deletion ; *Chromosome Duplication ; *Chromosome Inversion ; *Chromosomes, Human, Pair 4 ; Comparative Genomic Hybridization ; Female ; Gestational Age ; Humans ; Infant ; Pleural Effusion/ultrasonography ; Polyhydramnios/ultrasonography ; Pregnancy ; Wolf-Hirschhorn Syndrome/*genetics

OBJECTIVE: To carry out optical genome mapping (OGM) for a Chinese pedigree with a rare paracentric reverse insertion of chromosome 17. METHODS: A high-risk pregnant woman identified at the Prenatal Diagnosis Center of Hangzhou Women's Hospital in October 2021 and her family members were selected as the study subjects. Chromosome G banding analysis, fluorescence in situ hybridization (FISH), single nucleotide polymorphism array (SNP array) and OGM were applied to verify the balanced structural abnormality of chromosome 17 in the pedigree. RESULTS: Chromosomal karyotyping analysis and SNP array assay have identified a duplication of 17q23q25 in the fetus. Karyotyping analysis of the pregnant woman showed that the structure of chromosome 17 was abnormal, whilst SNP array has detected no abnormality. OGM revealed that the woman has carried a paracentric reverse insertion, which was confirmed by FISH. The karyotype of her husband was normal. CONCLUSION The duplication of 17q23q25 in the fetus has derived from a paracentric reverse insertion of chromosome 17 in its mother. OGM has the advantage for delineating balanced chromosome structural abnormalities.
Pregnancy ; Humans ; Female ; Pedigree ; In Situ Hybridization, Fluorescence ; Chromosomes, Human, Pair 17/genetics* ; East Asian People ; Chromosome Aberrations ; Prenatal Diagnosis ; Chromosome Mapping ; Chromosome Inversion

Here we report the cytogenetic and clinical manifestations observed in a patient with a rec(20)dup(20p)inv(20)(p11.2q13.3)mat. The patient was a full-term newborn girl with asymmetric intrauterine growth restriction and multiple congenital malformations, including a ventricular septal defect, pulmonary atresia, ambiguous genitalia, clinodactyly, and sacral dimpling. To our knowledge, this is the 4th report in the world and the 1st one in Korea of a patient with rec(20)dup(20p).
Abnormalities, Multiple/genetics ; Adult ; *Chromosome Inversion ; *Chromosomes, Human, Pair 20 ; Female ; Humans ; Infant, Newborn ; Phenotype ; *Recombination, Genetic ; *Trisomy