• 제목/요약/키워드: Chromosome duplication

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Deletion or Duplication Syndromes of Chromosome 22: Review

  • Kyung Ran Jun
    • Journal of Interdisciplinary Genomics
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    • 제6권1호
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    • pp.1-5
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    • 2024
  • Chromosome 22 is an acrocentric chromosome containing 500-600 genes, representing 1.5%-2% of the total DNA in cells. It was the first human chromosome to be fully sequenced by the Human Genome Project. Several syndromes involving the partial deletion or duplication of chromosome 22 are well descibed, including 22q11.2 deletion syndrome, 22q11.2 duplication syndrome, 22q11.2 distal deletion syndrome, Phelan-McDermid syndrome caused by a 22q13 deletion or pathogenic variant in SHANK3, and cat-eye syndrome caused by a 22 pter-q11 duplication. This review aims to provide concise information on the clinical characteristics of these syndromes. In particular, the similarities in features among these syndromes, genetic basis, and standard detection techniques are described, providing guidance for diagnosis and genetic counselling.

Anesthetic management of a patient with chromosome 6p duplication: a case report

  • Morinaga, Saori;Tsukamoto, Masanori;Yokoyama, Takeshi
    • Journal of Dental Anesthesia and Pain Medicine
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    • 제17권2호
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    • pp.139-141
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    • 2017
  • Chromosome 6p duplication is very rare and clinically characterized by short stature, mental retardation, and congenital heart diseases. Patients with mental retardation may present with poor oral health conditions. Dental treatment may need to be performed under general anesthesia in such patients. Our case report deals with induction of general anesthesia to a patient with chromosome 6p duplication, for dental treatment. The selection of a nasotracheal tube of an appropriate size, because of the patient's short stature, was especially important for airway management. In the present case, the patient with chromosome 6p duplication was intubated with a nasotracheal tube, which was not age-matched but adapted to the height and physique of the patient.

Septo-optic dysplasia associated with chromosome 15q13.3 duplication: a case report

  • Jeong A Ham;Sung Hyun Kim;Donghwi Park
    • Journal of Yeungnam Medical Science
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    • 제40권4호
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    • pp.419-422
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    • 2023
  • Septo-optic dysplasia (SOD) is a rare congenital anomaly that is clinically defined by developmental delay and characteristic brain magnetic resonance imaging findings, including optic nerve hypoplasia, pituitary hormone abnormalities, and midline brain defects. The occurrence of SOD is generally sporadic; however, it can be inherited rarely. Although an association with HESX1, SOX2, and SOX3 mutations has been identified, the detailed etiology is multifactorial and unclear. Here, we present the case of a 7-year-old girl who was clinically diagnosed with SOD and 15q13.3 duplication. Patients with duplication at chromosome 15q13.3 were reported to be diagnosed with autism spectrum disorder, epilepsy, and schizophrenia in previous studies. The relationship between SOD and the microduplication of 15q13.3 has not yet been explored. In this study, we suggest that there may be an association between chromosome 15q13.3 microduplication and SOD.

3번 염색체 단완 결실과 장완 중복을 동반한 1례 (A Case of Short Arm Deletion and Long Arm Duplication at Chromosome 3)

  • 공승현;서정일;강장희;정소영;목지선
    • Clinical and Experimental Pediatrics
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    • 제48권12호
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    • pp.1389-1389
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    • 2005
  • 저자들은 출생 시 납작한 후두골, 낮은 변형 귀, 양안 격리증, 넓고 낮은 콧등, 얇은 입술, 넓고 짧은 목의 덧살, 저긴장증, 피부의 다모증, 잠복고환 등의 소견을 보이는 미숙아의 염색체 핵형 분석에서 부모의 불균형 전도로부터 재조합된 염색체 이상의 결과로 인해 46,XY,rec(3)dup(3)(q21)del(3)(p25)inv(3)(p25q21)로 진단된 증례를 경험하였기에 문헌 고찰과 함께 보고하는 바이다.

A case of de novo duplication of 15q24-q26.3

  • Kim, Eun-Young;Kim, Yu-Kyong;Kim, Mi-Kyoung;Jung, Ji-Mi;Jeon, Ga-Won;Kim, Hye-Ran;Sin, Jong-Beom
    • Clinical and Experimental Pediatrics
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    • 제54권6호
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    • pp.267-271
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    • 2011
  • Distal duplication, or trisomy 15q, is an extremely rare chromosomal disorder characterized by prenatal and postnatal overgrowth, mental retardation, and craniofacial malformations. Additional abnormalities typically include an unusually short neck, malformations of the fingers and toes, scoliosis and skeletal malformations, genital abnormalities, particularly in affected males, and, in some cases, cardiac defects. The range and severity of symptoms and physical findings may vary from case to case, depending upon the length and location of the duplicated portion of chromosome 15q. Most reported cases of duplication of the long arm of chromosome 15 frequently have more than one segmental imbalance resulting from unbalanced translocations involving chromosome 15 and deletions in another chromosome, as well as other structural chromosomal abnormalities. We report a female newborn with a de novo duplication, 15q24- q26.3, showing intrauterine overgrowth, a narrow asymmetric face with down-slanting palpebral fissures, a large, prominent nose, and micrognathia, arachnodactyly, camptodactyly, congenital heart disease, hydronephrosis, and hydroureter. Chromosomal analysis showed a 46,XX,inv(9)(p12q13),dup(15)(q24q26.3). Array comparative genomic hybridization analysis revealed a gain of 42 clones on 15q24-q26.3. This case represents the only reported patient with a de novo 15q24-q26.3 duplication that did not result from an unbalanced translocation and did not have a concomitant monosomic component in Korea.

Duplication of intrachromosomal insertion segments $4q32{\rightarrow}q35$ confirmed by comparative genomic hybridization and fluorescent $in$ $situ$ hybridization

  • Kim, Jin-Woo;Park, Ju-Yeon;Oh, Ah-Rum;Choi, Eun-Young;Ryu, Hyun-Mee;Kang, Inn-Soo;Koong, Mi-Kyoung;Park, So-Yeon
    • Clinical and Experimental Reproductive Medicine
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    • 제38권4호
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    • pp.238-241
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    • 2011
  • A 35-year-old man with infertility was referred for chromosomal analysis. In routine cytogenetic analysis, the patient was seen to have additional material of unknown origin on the terminal region of the short arm of chromosome 4. To determine the origin of the unknown material, we carried out high-resolution banding, comparative genomic hybridization (CGH), and FISH. CGH showed a gain of signal on the region of $4q32{\rightarrow}q35$. FISH using whole chromosome painting and subtelomeric region probes for chromosome 4 confirmed the aberrant chromosome as an intrachromosomal insertion duplication of $4q32{\rightarrow}q35$. Duplication often leads to some phenotypic abnormalities; however, our patient showed an almost normal phenotype except for congenital dysfunction in spermatogenesis.

A newborn with developmental delay diagnosed with 4q35 deletion and 10p duplication

  • Kim, Beom Joon;Jang, Woori;Kim, Myungshin;Youn, YoungAh
    • Journal of Genetic Medicine
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    • 제17권2호
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    • pp.102-107
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    • 2020
  • We report the case of an infant with a 4q35.1 deletion with 10p duplication. This mutation is rarely reported in the literature and has been found to have variable clinical findings, often including developmental delay. In this case, the condition was detected by chromosomal microarray analysis after initial manifestation of a feeding problem and developmental delay. Minor dysmorphic features with abnormal neurological examination led to further evaluation. The father's chromosome complement was 46, XY, t(4;10)(q35;p12.2). Parental balanced translocation can go unrecognized, because affected individuals are often phenotypically healthy until they have fertility issues such as recurrent miscarriages or children with severe congenital disorders. Genetic diagnoses help to establish a clear family genetic background that permits the development of clear treatment strategies. Prenatal counseling can also help to understand the possible risks associated with pregnancy or future child planning.

8번 염색체 단완 결실과 장완 중복을 동반한 신생아 1례 (A Case of a del(8p)/dup(8q) Recombinant Chromosome)

  • 김정영;임효빈;손상희;정소영;성민정;서손상
    • Neonatal Medicine
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    • 제16권1호
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    • pp.76-80
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    • 2009
  • 저자들은 자궁 내 발육 지연으로 입원한 신새아가 요도하열, 잠복고환, 폐동맥판 협착이 동반되어 시행한 염색체 검사에서 불균형 전도로부터 재조합된 염색체이상의 결과로 8번 염색체 단완 결실과 장완 중복을 보인 1례를 경험하였기에 문헌 고찰과 함께 보고하는 바이다.

The Replication Protein Cdc6 Suppresses Centrosome Over-Duplication in a Manner Independent of Its ATPase Activity

  • Kim, Gwang Su;Lee, Inyoung;Kim, Ji Hun;Hwang, Deog Su
    • Molecules and Cells
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    • 제40권12호
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    • pp.925-934
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    • 2017
  • The Cdc6 protein is essential for the initiation of chromosomal replication and functions as a licensing factor to maintain chromosome integrity. During the S and G2 phases of the cell cycle, Cdc6 has been found to inhibit the recruitment of pericentriolar material (PCM) proteins to the centrosome and to suppress centrosome over-duplication. In this report, we analyzed the correlation between these two functions of Cdc6 at the centrosome. Cdc6 depletion increased the population of cells showing centrosome over-duplication and premature centrosome separation; Cdc6 expression reversed these changes. Deletion and fusion experiments revealed that the 18 amino acid residues (197-214) of Cdc6, which were fused to the Cdc6-centrosomal localization signal, suppressed centrosome over-duplication and premature centrosome separation. Cdc6 mutant proteins that showed defective ATP binding or hydrolysis did not exhibit a significant difference in suppressing centrosome over-duplication, compared to the wild type protein. In contrast to the Cdc6-mediated inhibition of PCM protein recruitment to the centrosome, the independence of Cdc6 on its ATPase activity for suppressing centrosome over-duplication, along with the difference between the Cdc6 protein regions participating in the two functions, suggested that Cdc6 controls centrosome duplication in a manner independent of its recruitment of PCM proteins to the centrosome.