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Leung WY, Luk HM, Vardhanabhuti V, Gao Y, Hui KF, Lau WY, Young TPH, Li JTC, Fung ELW, Chiu ATG, Lo IFM, Chung BHY, Cheung YF, Chan SHS. Infantile to late adulthood onset facioscapulohumeral dystrophy type 1: a case series. Hong Kong Med J 2021; 27:444-449. [PMID: 34949732 DOI: 10.12809/hkmj209001] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022] Open
Affiliation(s)
- W Y Leung
- Department of Paediatrics and Adolescent Medicine, Queen Mary Hospital, The University of Hong Kong, Hong Kong
| | - H M Luk
- Clinical Genetic Service, Department of Health, Hong Kong SAR Government, Hong Kong
| | - V Vardhanabhuti
- Department of Diagnostic Radiology, The University of Hong Kong, Hong Kong
| | - Y Gao
- Department of Medicine, Queen Mary Hospital, Hong Kong
| | - K F Hui
- Department of Medicine and Geriatrics, United Christian Hospital, Hong Kong
| | - W Y Lau
- Department of Medicine and Geriatrics, Kwong Wah Hospital, Hong Kong
| | - T P H Young
- Department of Medicine and Geriatrics, Ruttonjee & Tang Shiu Kin Hospitals, Hong Kong
| | - J T C Li
- Department of Medicine, Queen Elizabeth Hospital, Hong Kong
| | - E L W Fung
- Department of Paediatrics, Prince of Wales Hospital, Hong Kong
| | - A T G Chiu
- Department of Paediatrics and Adolescent Medicine, Queen Mary Hospital, The University of Hong Kong, Hong Kong
| | - I F M Lo
- Clinical Genetic Service, Department of Health, Hong Kong SAR Government, Hong Kong
| | - B H Y Chung
- Department of Paediatrics and Adolescent Medicine, Queen Mary Hospital, The University of Hong Kong, Hong Kong
| | - Y F Cheung
- Department of Medicine, Queen Elizabeth Hospital, Hong Kong
| | - S H S Chan
- Department of Paediatrics and Adolescent Medicine, Queen Mary Hospital, The University of Hong Kong, Hong Kong
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Yu PT, Ho S, Ng SC, Lo FM, Luk HM. Isolated hereditary diffuse palmoplantar keratoderma in Hong Kong Chinese patients: a case series. Hong Kong Med J 2021; 27:358-361. [PMID: 34706987 DOI: 10.12809/hkmj208902] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022] Open
Affiliation(s)
- P T Yu
- Clinical Genetic Service, Department of Health, Hong Kong
| | - S Ho
- Clinical Genetic Service, Department of Health, Hong Kong
| | - S C Ng
- Social Hygiene Clinic, Department of Health, Hong Kong
| | - F M Lo
- Clinical Genetic Service, Department of Health, Hong Kong
| | - H M Luk
- Clinical Genetic Service, Department of Health, Hong Kong
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3
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Chan YM, Law KM, Poon LCY, Luk HM, Cheng YKY, Leung TY. Genetic association of retroesophageal left brachiocephalic vein. Ultrasound Obstet Gynecol 2019; 54:836-837. [PMID: 30937965 DOI: 10.1002/uog.20275] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/01/2019] [Revised: 03/19/2019] [Accepted: 03/28/2019] [Indexed: 06/09/2023]
Affiliation(s)
- Y M Chan
- Department of Obstetrics and Gynecology, The Chinese University of Hong Kong, Shatin, Hong Kong, SAR, China
| | - K M Law
- Department of Obstetrics and Gynecology, The Chinese University of Hong Kong, Shatin, Hong Kong, SAR, China
| | - L C Y Poon
- Department of Obstetrics and Gynecology, The Chinese University of Hong Kong, Shatin, Hong Kong, SAR, China
| | - H M Luk
- Clinical Genetic Service, Department of Health, Hong Kong, SAR, China
| | - Y K Y Cheng
- Department of Obstetrics and Gynecology, The Chinese University of Hong Kong, Shatin, Hong Kong, SAR, China
| | - T Y Leung
- Department of Obstetrics and Gynecology, The Chinese University of Hong Kong, Shatin, Hong Kong, SAR, China
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Abstract
Patellar instability is a common debilitating injury affecting young active individuals. It accounts for approximately 3% of all knee injuries. We report a family, of which five members across three generations, who suffered from autosomal dominant familial recurrent patellar dislocation as well as short stature. All of them have recurrent patellar dislocations before the age of 15. The affected patients in all three generations have been genetically screened. Genotypical evaluation revealed a balanced translocation of chromosomes 15 and 20.
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Affiliation(s)
- Cm Jimmy Chan
- 1 Department of Orthopaedics and Traumatology, Yan Chai Hospital, Shatin, Hong Kong, China
| | - Ym Jackie Chau
- 2 Department of Orthopaedics and Traumatology, Kwong Wah Hospital, 25 Waterloo Road, Hong Kong, China
| | - S B Woo
- 2 Department of Orthopaedics and Traumatology, Kwong Wah Hospital, 25 Waterloo Road, Hong Kong, China
| | - H M Luk
- 3 Department of Health, Clinical Genetic Service, Kowloon, Hong Kong, China
| | - Ivan Fm Lo
- 3 Department of Health, Clinical Genetic Service, Kowloon, Hong Kong, China
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5
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Lau WL, Yung WY, Leung WC, Kan A, Chan K, Luk HM, Kan E, Lam YY. Prenatal diagnosis of familial atretic encephalocele. Ultrasound Obstet Gynecol 2019; 54:277-279. [PMID: 30151917 DOI: 10.1002/uog.20109] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/18/2018] [Revised: 08/01/2018] [Accepted: 08/15/2018] [Indexed: 06/08/2023]
Affiliation(s)
- W L Lau
- Department of Obstetrics and Gynaecology, Kwong Wah Hospital, Kowloon, Hong Kong SAR
| | - W Y Yung
- Department of Obstetrics and Gynaecology, Kwong Wah Hospital, Kowloon, Hong Kong SAR
| | - W C Leung
- Department of Obstetrics and Gynaecology, Kwong Wah Hospital, Kowloon, Hong Kong SAR
| | - A Kan
- Prenatal Diagnostic Laboratory, Obstetrics and Gynecology, Tsan Yuk Hospital, Sai Ying Pun, Hong Kong SAR
| | - K Chan
- Prenatal Diagnostic Laboratory, Obstetrics and Gynecology, Tsan Yuk Hospital, Sai Ying Pun, Hong Kong SAR
| | - H M Luk
- Clinical Genetic Service, Hong Kong SAR
| | - E Kan
- Department of Diagnostic and Interventional Radiology, Kwong Wah Hospital, Kowloon, Hong Kong SAR
| | - Y Y Lam
- Department of Paediatrics, Kwong Wah Hospital, Kowloon, Hong Kong SAR
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6
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Chan PYT, Luk HM, Lee FMY, Lo IFM. Genetic profile and clinical application of chromosomal microarray in children with intellectual disability in Hong Kong. Hong Kong Med J 2018; 24:451-459. [DOI: 10.12809/hkmj187260] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022] Open
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7
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Luk HM, Tong TMF, Lo IFM. Birt-Hogg-Dubé syndrome: a rare cause of familial spontaneous pneumothorax. Hong Kong Med J 2017; 23:416.e4-5. [DOI: 10.12809/hkmj165022] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022] Open
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8
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Abstract
Sound symbolism suggests a non-arbitrary relationship between speech sounds and the concepts to which those sounds refer (Hinton, Nichols, & Ohala, 2006 ). Supporting evidence comes primarily from studies investigating how speech sounds relate to semantically compatible visual concepts. The present study therefore attempted to examine sound symbolism in the context of tactile perception. Contrary to the propositions of sound symbolism, participants in Experiment 1 did not consistently assign names with plosive consonant to objects with curved frames. Experiment 2, however, found that names with fricative consonants were more likely to be applied to materials with rough surfaces. The results suggested the existence of a direct relationship between speech sounds and their referent concepts that could be crucial in revealing the phenomenon of sound symbolism. A future study was also proposed to study the contributions of mouth shape and airflow to associations between speech sounds and tactile feelings. (161 words).
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Affiliation(s)
| | - H M Luk
- a Hong Kong Shue Yan University
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9
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Abstract
OBJECTIVES To examine the molecular pathogenetic mechanisms, (epi)genotype-phenotype correlation, and the performance of the three clinical scoring systems-namely Netchine et al, Bartholdi et al, and Birmingham scores-for patients with Silver-Russell syndrome in Hong Kong. METHODS This retrospective case series was conducted at two tertiary genetic clinics, the Clinical Genetic Service, Department of Health, and clinical genetic clinic in Queen Mary Hospital in Hong Kong. All records of patients with suspected Silver-Russell syndrome under the care of the two genetic clinics between January 2010 and September 2015 were retrieved from the computer database. RESULTS Of the 28 live-birth patients with Silver-Russell syndrome, 35.7% had H19 loss of DNA methylation, 21.4% had maternal uniparental disomy of chromosome 7, 3.6% had mosaic maternal uniparental disomy of chromosome 11, and the remaining 39.3% were Silver-Russell syndrome of unexplained molecular origin. No significant correlation between (epi)genotype and phenotype could be identified between H19 loss of DNA methylation and maternal uniparental disomy of chromosome 7. Comparison of molecularly confirmed patients and patients with Silver-Russell syndrome of unexplained origin revealed that postnatal microcephaly and café-au-lait spots were more common in the latter group, and body and limb asymmetry was more common in the former group. Performance analysis showed the Netchine et al and Birmingham scoring systems had similar sensitivity in identifying Hong Kong Chinese subjects with Silver-Russell syndrome. CONCLUSION This is the first territory-wide study of Silver-Russell syndrome in Hong Kong. The clinical features and the spectrum of underlying epigenetic defects were comparable to those reported in western populations.
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Affiliation(s)
- H M Luk
- Clinical Genetic Service, Department of Health, 3/F, Cheung Sha Wan Jockey Club Clinic, 2 Kwong Lee Road, Sham Shui Po, Hong Kong
| | - K S Yeung
- Department of Paediatrics and Adolescent Medicine, Queen Mary Hospital, The University of Hong Kong, Pokfulam, Hong Kong
| | - W L Wong
- Department of Paediatrics and Adolescent Medicine, Queen Mary Hospital, The University of Hong Kong, Pokfulam, Hong Kong
| | - B Hy Chung
- Department of Paediatrics and Adolescent Medicine, Queen Mary Hospital, The University of Hong Kong, Pokfulam, Hong Kong
| | - T Mf Tong
- Clinical Genetic Service, Department of Health, 3/F, Cheung Sha Wan Jockey Club Clinic, 2 Kwong Lee Road, Sham Shui Po, Hong Kong
| | - I Fm Lo
- Clinical Genetic Service, Department of Health, 3/F, Cheung Sha Wan Jockey Club Clinic, 2 Kwong Lee Road, Sham Shui Po, Hong Kong
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10
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Choufani S, Cytrynbaum C, Chung BHY, Turinsky AL, Grafodatskaya D, Chen YA, Cohen ASA, Dupuis L, Butcher DT, Siu MT, Luk HM, Lo IFM, Lam STS, Caluseriu O, Stavropoulos DJ, Reardon W, Mendoza-Londono R, Brudno M, Gibson WT, Chitayat D, Weksberg R. NSD1 mutations generate a genome-wide DNA methylation signature. Nat Commun 2015; 6:10207. [PMID: 26690673 PMCID: PMC4703864 DOI: 10.1038/ncomms10207] [Citation(s) in RCA: 133] [Impact Index Per Article: 14.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/03/2015] [Accepted: 11/13/2015] [Indexed: 01/07/2023] Open
Abstract
Sotos syndrome (SS) represents an important human model system for the study of epigenetic regulation; it is an overgrowth/intellectual disability syndrome caused by mutations in a histone methyltransferase, NSD1. As layered epigenetic modifications are often interdependent, we propose that pathogenic NSD1 mutations have a genome-wide impact on the most stable epigenetic mark, DNA methylation (DNAm). By interrogating DNAm in SS patients, we identify a genome-wide, highly significant NSD1+/−-specific signature that differentiates pathogenic NSD1 mutations from controls, benign NSD1 variants and the clinically overlapping Weaver syndrome. Validation studies of independent cohorts of SS and controls assigned 100% of these samples correctly. This highly specific and sensitive NSD1+/− signature encompasses genes that function in cellular morphogenesis and neuronal differentiation, reflecting cardinal features of the SS phenotype. The identification of SS-specific genome-wide DNAm alterations will facilitate both the elucidation of the molecular pathophysiology of SS and the development of improved diagnostic testing. Sotos syndrome is an growth syndrome characterized by advanced growth in childhood, characteristic facial appearance and intellectual disability. Here the authors identify a genome-wide DNA methylation signature that accurately diagnoses Sotos Syndrome and distinguishes it from similar conditions.
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Affiliation(s)
- S Choufani
- Program in Genetics and Genome Biology, The Hospital for Sick Children, 555 University Avenue, Toronto, Ontario, Canada M5G 1X8
| | - C Cytrynbaum
- Program in Genetics and Genome Biology, The Hospital for Sick Children, 555 University Avenue, Toronto, Ontario, Canada M5G 1X8.,Division of Clinical and Metabolic Genetics, The Hospital for Sick Children, 555 University Avenue, Toronto, Ontario, Canada M5G 1X8.,Department of Molecular Genetics, University of Toronto, 27 King's College Circle, Toronto, Ontario, Canada M5S 1A1
| | - B H Y Chung
- Department of Pediatrics and Adolescent Medicine, Li Ka Shing Faculty of Medicine, University of Hong Kong, 6/F, William MW Mong Block, 21 Sassoon Road, Pokfulam, Hong Kong
| | - A L Turinsky
- Program in Genetics and Genome Biology, The Hospital for Sick Children, 555 University Avenue, Toronto, Ontario, Canada M5G 1X8.,Centre for Computational Medicine, The Hospital for Sick Children, 555 University Avenue, Toronto, Ontario, Canada M5G 1X8
| | - D Grafodatskaya
- Program in Genetics and Genome Biology, The Hospital for Sick Children, 555 University Avenue, Toronto, Ontario, Canada M5G 1X8
| | - Y A Chen
- Program in Genetics and Genome Biology, The Hospital for Sick Children, 555 University Avenue, Toronto, Ontario, Canada M5G 1X8.,Institute of Medical Science, School of Graduate Studies, University of Toronto, 2374-1 King's College Circle, Toronto, Ontario, Canada M5S 1A8
| | - A S A Cohen
- Department of Medical Genetics, UBC, Child and Family Research Institute, 950W 28th Avenue, Vancouver, British Columbia V5Z 4H4, USA
| | - L Dupuis
- Division of Clinical and Metabolic Genetics, The Hospital for Sick Children, 555 University Avenue, Toronto, Ontario, Canada M5G 1X8.,Department of Molecular Genetics, University of Toronto, 27 King's College Circle, Toronto, Ontario, Canada M5S 1A1
| | - D T Butcher
- Program in Genetics and Genome Biology, The Hospital for Sick Children, 555 University Avenue, Toronto, Ontario, Canada M5G 1X8
| | - M T Siu
- Program in Genetics and Genome Biology, The Hospital for Sick Children, 555 University Avenue, Toronto, Ontario, Canada M5G 1X8
| | - H M Luk
- Clinical Genetics Service, Department of Health, Cheung Sha Wan Jockey Club Clinic, 1/F-3/F, 2 Kwong Lee Road, Sham Shui Po, Kowloon, Hong Kong
| | - I F M Lo
- Clinical Genetics Service, Department of Health, Cheung Sha Wan Jockey Club Clinic, 1/F-3/F, 2 Kwong Lee Road, Sham Shui Po, Kowloon, Hong Kong
| | - S T S Lam
- Clinical Genetics Service, Department of Health, Cheung Sha Wan Jockey Club Clinic, 1/F-3/F, 2 Kwong Lee Road, Sham Shui Po, Kowloon, Hong Kong
| | - O Caluseriu
- Department of Medical Genetics, University of Alberta, 116 Street and 85 Avenue, Edmonton, Alberta, Canada T6G 2R3
| | - D J Stavropoulos
- Pediatric Laboratory Medicine, The Hospital for Sick Children, 555 University Avenue, Toronto, Ontario, Canada M5G 1X8.,Laboratory Medicine and Pathobiology, University of Toronto, 27 King's College Circle, Toronto, Ontario, Canada M5S 1A1
| | - W Reardon
- Our Lady's Hospital for Sick Children, Crumlin D12 N512 Ireland
| | - R Mendoza-Londono
- Program in Genetics and Genome Biology, The Hospital for Sick Children, 555 University Avenue, Toronto, Ontario, Canada M5G 1X8.,Division of Clinical and Metabolic Genetics, The Hospital for Sick Children, 555 University Avenue, Toronto, Ontario, Canada M5G 1X8.,Department of Pediatrics, University of Toronto, 27 King's College Circle, Toronto, Ontario, Canada M5S 1A1
| | - M Brudno
- Program in Genetics and Genome Biology, The Hospital for Sick Children, 555 University Avenue, Toronto, Ontario, Canada M5G 1X8.,Centre for Computational Medicine, The Hospital for Sick Children, 555 University Avenue, Toronto, Ontario, Canada M5G 1X8.,Department of Computer Science, University of Toronto, 27 King's College Circle, Toronto, Ontario, Canada M5S 1A1
| | - W T Gibson
- Department of Medical Genetics, UBC, Child and Family Research Institute, 950W 28th Avenue, Vancouver, British Columbia V5Z 4H4, USA
| | - D Chitayat
- Division of Clinical and Metabolic Genetics, The Hospital for Sick Children, 555 University Avenue, Toronto, Ontario, Canada M5G 1X8.,Department of Molecular Genetics, University of Toronto, 27 King's College Circle, Toronto, Ontario, Canada M5S 1A1.,Department of Pediatrics, University of Toronto, 27 King's College Circle, Toronto, Ontario, Canada M5S 1A1.,Prenatal Diagnosis and Medical Genetics Program, Mount Sinai Hospital, 600 University Avenue, Toronto, Ontario, Canada M5G 1X5
| | - R Weksberg
- Program in Genetics and Genome Biology, The Hospital for Sick Children, 555 University Avenue, Toronto, Ontario, Canada M5G 1X8.,Division of Clinical and Metabolic Genetics, The Hospital for Sick Children, 555 University Avenue, Toronto, Ontario, Canada M5G 1X8.,Department of Molecular Genetics, University of Toronto, 27 King's College Circle, Toronto, Ontario, Canada M5S 1A1.,Institute of Medical Science, School of Graduate Studies, University of Toronto, 2374-1 King's College Circle, Toronto, Ontario, Canada M5S 1A8.,Department of Pediatrics, University of Toronto, 27 King's College Circle, Toronto, Ontario, Canada M5S 1A1
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11
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Tong SYK, Luk HM, Tong TMF, Lo IFM. The nail points to the diagnosis. Fong disease or hereditary osteo-onychodysplasia. Hong Kong Med J 2015; 21:573.e3-5. [PMID: 26634378 DOI: 10.12809/hkmj154728] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022] Open
Affiliation(s)
| | - H M Luk
- Clinical Genetic Service, Department of Health, Hong Kong
| | - Tony M F Tong
- Clinical Genetic Service, Department of Health, Hong Kong
| | - Ivan F M Lo
- Clinical Genetic Service, Department of Health, Hong Kong
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12
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Gu S, Posey JE, Yuan B, Carvalho CMB, Luk HM, Erikson K, Lo IFM, Leung GKC, Pickering CR, Chung BHY, Lupski JR. Mechanisms for the Generation of Two Quadruplications Associated with Split-Hand Malformation. Hum Mutat 2015; 37:160-4. [PMID: 26549411 DOI: 10.1002/humu.22929] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/29/2015] [Accepted: 10/26/2015] [Indexed: 01/03/2023]
Abstract
Germline copy-number variants (CNVs) involving quadruplications are rare and the mechanisms generating them are largely unknown. Previously, we reported a 20-week gestation fetus with split-hand malformation; clinical microarray detected two maternally inherited triplications separated by a copy-number neutral region at 17p13.3, involving BHLHA9 and part of YWHAE. Here, we describe an 18-month-old male sibling of the previously described fetus with split-hand malformation. Custom high-density microarray and digital droplet PCR revealed the copy-number gains were actually quadruplications in the mother, the fetus, and her later born son. This quadruplication-normal-quadruplication pattern was shown to be expanded from the triplication-normal-triplication CNV at the same loci in the maternal grandmother. We mapped two breakpoint junctions and demonstrated that both are mediated by Alu repetitive elements and identical in these four individuals. We propose a three-step process combining Alu-mediated replicative-repair-based mechanism(s) and intergenerational, intrachromosomal nonallelic homologous recombination to generate the quadruplications in this family.
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Affiliation(s)
- Shen Gu
- Department of Molecular & Human Genetics, Baylor College of Medicine, Houston, Texas, 77030
| | - Jennifer E Posey
- Department of Molecular & Human Genetics, Baylor College of Medicine, Houston, Texas, 77030
| | - Bo Yuan
- Department of Molecular & Human Genetics, Baylor College of Medicine, Houston, Texas, 77030
| | - Claudia M B Carvalho
- Department of Molecular & Human Genetics, Baylor College of Medicine, Houston, Texas, 77030
| | - H M Luk
- Clinical Genetic Service, Department of Health, Hong Kong, China
| | - Kelly Erikson
- Department of Head and Neck Surgery, The University of Texas MD Anderson Cancer Center, Houston, Texas, 77030
| | - Ivan F M Lo
- Clinical Genetic Service, Department of Health, Hong Kong, China
| | - Gordon K C Leung
- Department of Obstetrics & Gynaecology, Li Ka Shing Faculty of Medicine, The University of Hong Kong, Hong Kong, China.,Department of Paediatrics and Adolescent Medicine, Queen Mary Hospital, Li Ka Shing Faculty of Medicine, The University of Hong Kong, Hong Kong, China
| | - Curtis R Pickering
- Department of Head and Neck Surgery, The University of Texas MD Anderson Cancer Center, Houston, Texas, 77030
| | - Brian H Y Chung
- Department of Obstetrics & Gynaecology, Li Ka Shing Faculty of Medicine, The University of Hong Kong, Hong Kong, China.,Department of Paediatrics and Adolescent Medicine, Queen Mary Hospital, Li Ka Shing Faculty of Medicine, The University of Hong Kong, Hong Kong, China
| | - James R Lupski
- Department of Molecular & Human Genetics, Baylor College of Medicine, Houston, Texas, 77030.,Department of Pediatrics, Baylor College of Medicine, Houston, Texas, 77030.,Human Genome Sequencing Center, Baylor College of Medicine, Houston, Texas, 77030.,Texas Children's Hospital, Houston, Texas, 77030
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13
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Luk HM, Lo IFM, Fu KH, Lui CHT, Tong TMF, Chan DHC, Lam STS. Oculopharyngeal muscular dystrophy: underdiagnosed disease in Hong Kong. Hong Kong Med J 2014; 19:556-9. [PMID: 24310666 DOI: 10.12809/hkmj133739] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022] Open
Abstract
Despite the advances in the understanding of the molecular basis for oculopharyngeal muscular dystrophy in the last decade, it remains an underdiagnosed disease, especially among the Chinese. In the presence of a positive family history and late-onset ptosis, dysphagia, and proximal muscle weakness (its cardinal features), we suggest that PABPN1 gene analysis should be the first-line investigation to rule out this condition. Muscle biopsy can be reserved for atypical cases. Non-specific mitochondrial changes in the muscle specimens of these patients should be appreciated, so as to avoid diagnostic confusion. It is hoped that greater awareness among medical professionals and judicious use of PABPN1 gene analysis will lead to earlier diagnosis, better management, and avoidance of unnecessary invasive investigations of affected patients.
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Affiliation(s)
- H M Luk
- Clinical Genetic Service, Department of Health, Cheung Sha Wan Jockey Club Clinic, Shamshuipo, Kowloon, Hong Kong
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14
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Yeung KS, Chee YY, Luk HM, Kan ASY, Tang MHY, Lau ET, Shuen AY, Lo IFM, Chan KYK, Chung BHY. Spread of X inactivation on chromosome 15 is associated with a more severe phenotype in a girl with an unbalanced t(X; 15) translocation. Am J Med Genet A 2014; 164A:2521-8. [DOI: 10.1002/ajmg.a.36670] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/13/2013] [Accepted: 05/22/2014] [Indexed: 01/29/2023]
Affiliation(s)
- KS Yeung
- Department of Paediatrics and Adolescent Medicine, Li Ka Shing Faculty of Medicine; The University of Hong Kong, Hong Kong Special Administrative Region; China
| | - YY Chee
- Department of Paediatrics and Adolescent Medicine, Li Ka Shing Faculty of Medicine; The University of Hong Kong, Hong Kong Special Administrative Region; China
| | - HM Luk
- Clinical Genetic Service; Department of Health; Hong Kong SAR China
| | - Anita SY Kan
- Department of Obstetrics & Gynaecology, Li Ka Shing Faculty of Medicine; The University of Hong Kong, Hong Kong Special Administrative Region; China
| | - Mary HY Tang
- Department of Obstetrics & Gynaecology, Li Ka Shing Faculty of Medicine; The University of Hong Kong, Hong Kong Special Administrative Region; China
| | - Elizabeth T Lau
- Department of Obstetrics & Gynaecology, Li Ka Shing Faculty of Medicine; The University of Hong Kong, Hong Kong Special Administrative Region; China
| | - Andrew Y Shuen
- Department of Human Genetics; McGill University; Montreal Canada
| | - Ivan FM Lo
- Clinical Genetic Service; Department of Health; Hong Kong SAR China
| | - Kelvin YK Chan
- Department of Obstetrics & Gynaecology, Li Ka Shing Faculty of Medicine; The University of Hong Kong, Hong Kong Special Administrative Region; China
| | - Brian HY Chung
- Department of Paediatrics and Adolescent Medicine, Li Ka Shing Faculty of Medicine; The University of Hong Kong, Hong Kong Special Administrative Region; China
- Department of Obstetrics & Gynaecology, Li Ka Shing Faculty of Medicine; The University of Hong Kong, Hong Kong Special Administrative Region; China
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15
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Luk HM, Wong VCH, Lo IFM, Chan KYK, Lau ET, Kan ASY, Tang MHY, Tang WF, She WMK, Chu YWY, Sin WK, Chung BHY. A prenatal case of split-hand malformation associated with 17p13.3 triplication - a dilemma in genetic counseling. Eur J Med Genet 2013; 57:81-4. [PMID: 24380768 DOI: 10.1016/j.ejmg.2013.12.005] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/13/2013] [Accepted: 12/22/2013] [Indexed: 10/25/2022]
Abstract
Copy number gain of 17p13.3 has been shown to be associated with developmental delay/autism and Split-Hand-Foot malformation. We report a case of fetus with bilateral split-hand malformation detected on prenatal ultrasound. Array comparative genomic hybridization detected 2 maternally inherited copy number gains in the 17p13.3 region with one of them involving the BHLHA9 gene and part of the YWHAE gene. The mother is normal in intelligence with mild right foot anomaly only. Although the BHLHA9 copy gain is known to be associated with split-hand-foot malformation, the penetrance and expressivity is highly variable. More challenging is the effect of partial YWHAE copy number gain on neurodevelopment is inconclusive based on current literature. This case highlights the difficulties of prenatal genetic counseling in array comparative genomic hybridization findings in clinical situation with incomplete understanding of genotype-phenotype correlation.
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Affiliation(s)
- H M Luk
- Clinical Genetic Service, Department of Health, Hong Kong, China
| | - Vincent C H Wong
- Department of Paediatrics and Adolescent Medicine, Queen Mary Hospital, Li Ka Shing Faculty of Medicine, The University of Hong Kong, Hong Kong, China
| | - Ivan F M Lo
- Clinical Genetic Service, Department of Health, Hong Kong, China
| | - Kelvin Y K Chan
- Department of Obstetrics & Gynaecology, Li Ka Shing Faculty of Medicine, The University of Hong Kong, Hong Kong, China; Prenatal Diagnostic and Counseling Department, Tsan Yuk Hospital, Hong Kong, China
| | - Elizabeth T Lau
- Department of Obstetrics & Gynaecology, Li Ka Shing Faculty of Medicine, The University of Hong Kong, Hong Kong, China; Prenatal Diagnostic and Counseling Department, Tsan Yuk Hospital, Hong Kong, China
| | - Anita S Y Kan
- Department of Obstetrics & Gynaecology, Li Ka Shing Faculty of Medicine, The University of Hong Kong, Hong Kong, China; Department of Obstetrics & Gynaecology, Queen Mary Hospital, Hong Kong, China
| | - Mary H Y Tang
- Prenatal Diagnostic and Counseling Department, Tsan Yuk Hospital, Hong Kong, China
| | - W F Tang
- Department of Obstetrics & Gynaecology, Li Ka Shing Faculty of Medicine, The University of Hong Kong, Hong Kong, China
| | - Wandy M K She
- Department of Paediatrics and Adolescent Medicine, Queen Mary Hospital, Li Ka Shing Faculty of Medicine, The University of Hong Kong, Hong Kong, China
| | - Yoyo W Y Chu
- Department of Paediatrics and Adolescent Medicine, Queen Mary Hospital, Li Ka Shing Faculty of Medicine, The University of Hong Kong, Hong Kong, China
| | - W K Sin
- Department of Obstetrics & Gynaecology, Tuen Mun Hospital, Hong Kong, China
| | - Brian H Y Chung
- Department of Paediatrics and Adolescent Medicine, Queen Mary Hospital, Li Ka Shing Faculty of Medicine, The University of Hong Kong, Hong Kong, China; Department of Obstetrics & Gynaecology, Li Ka Shing Faculty of Medicine, The University of Hong Kong, Hong Kong, China.
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16
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Luk HM, Lo IFM, Yu KMC, Tong TMF, Lam STS. A young woman with mucocutaneous pigmentation and intestinal polyps. Hong Kong Med J 2013; 19:276.e3-4. [PMID: 23732439 DOI: 10.12809/hkmj133753] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022] Open
Affiliation(s)
- H M Luk
- Clinical Genetic Service, Department of Health, Hong Kong
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17
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Luk HM, Lo IFM, Lai CWS, Ma LCK, Tong TMF, Chan DHC, Lam STS. Congenital fibrosis of extraocular muscle type 1A due to KIF21A mutation: first case report from Hong Kong. Hong Kong Med J 2013; 19:182-185. [PMID: 23535681] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/02/2023] Open
Abstract
With the advancement of ophthalmological genetics, the molecular basis for more and more eye diseases can be elucidated. Congenital fibrosis of extraocular muscle (CFEOM) is an example. It is characterised by a congenital non-progressive restrictive ophthalmoplegia and ptosis. It is an autosomal dominant disease, caused by mutations of the KIF21A gene. With positive family history and typical ophthalmological findings, mutational analysis of KIF21A gene should be performed, not only to confirming the diagnosis, but also to offer a prognosis, for genetic counselling, and the possibility of prenatal diagnosis. Here we report the first KIF21A mutation associated with CFEOM1A in Hong Kong.
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Affiliation(s)
- H M Luk
- Clinical Genetic Service, Department of Health, 2 Kwong Lee Road, Shamshuipo, Hong Kong
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