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Knapp A, Jagła M, Madetko-Talowska A, Szewczyk K, Książek T, Końska K, Kwinta P. Paternal uniparental disomy of chromosome 2 resulting in a concurrent presentation of Crigler-Najjar syndrome type I and long-chain 3-hydroxyacyl-CoA dehydrogenase deficiency. Am J Med Genet A 2022; 188:1848-1852. [PMID: 35199468 DOI: 10.1002/ajmg.a.62696] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/08/2021] [Revised: 12/27/2021] [Accepted: 01/28/2022] [Indexed: 11/06/2022]
Abstract
This is the first report of the concurrent development of long-chain 3-hydroxyacyl-CoA dehydrogenase deficiency (LCHADD) and Crigler-Najjar syndrome type 1 (CNs1) inherited via uniparental disomy of chromosome 2, which are both autosomal recessive pathologies. Through an expanded newborn metabolic panel, a male infant was identified as having an acylcarnitine pattern typical for LCHADD, later confirmed to be caused by a well-characterized pathogenic variant in the HADHA gene located at 2p23. Prolonged non-hematologic jaundice requiring repetitive phototherapy prompted further genetic analysis, leading to the identification of another genetic abnormality consistent with CNs1, which was caused by a novel pathogenic variant in the UGT1A1 gene located at 2q37. The two identified point mutations in chromosome 2 were homozygous and present on separate arms, which indicated potential uniparental disomy. Microarray analysis of the genetic material from the patient and his parents confirmed paternal isodisomy of chromosome 2. Further studies are needed to identify other possible pathogenic variants located on the same defective chromosome, evaluate the combined effect of the two metabolic abnormalities, and plan the best possible treatment and care.
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Affiliation(s)
- Anna Knapp
- Department of Pediatrics, Chair of Pediatrics Jagiellonian University Medical College, Krakow, Poland
| | - Mateusz Jagła
- Department of Pediatrics, Chair of Pediatrics Jagiellonian University Medical College, Krakow, Poland
| | - Anna Madetko-Talowska
- University Children Hospital in Krakow, Krakow, Poland.,Department of Medical Genetics, Chair of Pediatrics Jagiellonian University Medical College, Krakow, Poland
| | - Katarzyna Szewczyk
- University Children Hospital in Krakow, Krakow, Poland.,Department of Medical Genetics, Chair of Pediatrics Jagiellonian University Medical College, Krakow, Poland
| | - Teofila Książek
- University Children Hospital in Krakow, Krakow, Poland.,Department of Medical Genetics, Chair of Pediatrics Jagiellonian University Medical College, Krakow, Poland
| | - Katarzyna Końska
- Department of Medical Genetics, Chair of Pediatrics Jagiellonian University Medical College, Krakow, Poland
| | - Przemko Kwinta
- Department of Pediatrics, Chair of Pediatrics Jagiellonian University Medical College, Krakow, Poland
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Kohl S, Baumann B, Dassie F, Mayer AK, Solaki M, Reuter P, Kühlewein L, Wissinger B, Maffei P. Paternal Uniparental Isodisomy of Chromosome 2 in a Patient with CNGA3-Associated Autosomal Recessive Achromatopsia. Int J Mol Sci 2021; 22:7842. [PMID: 34360608 PMCID: PMC8346044 DOI: 10.3390/ijms22157842] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/16/2021] [Revised: 07/13/2021] [Accepted: 07/21/2021] [Indexed: 01/18/2023] Open
Abstract
Achromatopsia (ACHM) is a rare autosomal recessively inherited retinal disease characterized by congenital photophobia, nystagmus, low visual acuity, and absence of color vision. ACHM is genetically heterogeneous and can be caused by biallelic mutations in the genes CNGA3, CNGB3, GNAT2, PDE6C, PDE6H, or ATF6. We undertook molecular genetic analysis in a single female patient with a clinical diagnosis of ACHM and identified the homozygous variant c.778G>C;p.(D260H) in the CNGA3 gene. While segregation analysis in the father, as expected, identified the CNGA3 variant in a heterozygous state, it could not be displayed in the mother. Microsatellite marker analysis provided evidence that the homozygosity of the CNGA3 variant is due to partial or complete paternal uniparental isodisomy (UPD) of chromosome 2 in the patient. Apart from the ACHM phenotype, the patient was clinically unsuspicious and healthy. This is one of few examples proving UPD as the underlying mechanism for the clinical manifestation of a recessive mutation in a patient with inherited retinal disease. It also highlights the importance of segregation analysis in both parents of a given patient or especially in cases of homozygous recessive mutations, as UPD has significant implications for genetic counseling with a very low recurrence risk assessment in such families.
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Affiliation(s)
- Susanne Kohl
- Centre for Ophthalmology, Institute for Ophthalmic Research, University Tübingen, 72076 Tübingen, Germany; (B.B.); (A.K.M.); (M.S.); (P.R.); (L.K.); (B.W.)
| | - Britta Baumann
- Centre for Ophthalmology, Institute for Ophthalmic Research, University Tübingen, 72076 Tübingen, Germany; (B.B.); (A.K.M.); (M.S.); (P.R.); (L.K.); (B.W.)
| | - Francesca Dassie
- Department of Medicine (DIMED), University of Padua, 35121 Padua, Italy; (F.D.); (P.M.)
| | - Anja K. Mayer
- Centre for Ophthalmology, Institute for Ophthalmic Research, University Tübingen, 72076 Tübingen, Germany; (B.B.); (A.K.M.); (M.S.); (P.R.); (L.K.); (B.W.)
| | - Maria Solaki
- Centre for Ophthalmology, Institute for Ophthalmic Research, University Tübingen, 72076 Tübingen, Germany; (B.B.); (A.K.M.); (M.S.); (P.R.); (L.K.); (B.W.)
| | - Peggy Reuter
- Centre for Ophthalmology, Institute for Ophthalmic Research, University Tübingen, 72076 Tübingen, Germany; (B.B.); (A.K.M.); (M.S.); (P.R.); (L.K.); (B.W.)
| | - Laura Kühlewein
- Centre for Ophthalmology, Institute for Ophthalmic Research, University Tübingen, 72076 Tübingen, Germany; (B.B.); (A.K.M.); (M.S.); (P.R.); (L.K.); (B.W.)
- Centre for Ophthalmology, University Eye Hospital, University Tübingen, 72076 Tübingen, Germany
| | - Bernd Wissinger
- Centre for Ophthalmology, Institute for Ophthalmic Research, University Tübingen, 72076 Tübingen, Germany; (B.B.); (A.K.M.); (M.S.); (P.R.); (L.K.); (B.W.)
| | - Pietro Maffei
- Department of Medicine (DIMED), University of Padua, 35121 Padua, Italy; (F.D.); (P.M.)
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A patient with Silver-Russell syndrome with multilocus imprinting disturbance, and Schimke immuno-osseous dysplasia unmasked by uniparental isodisomy of chromosome 2. J Hum Genet 2021; 66:1121-1126. [PMID: 34031513 DOI: 10.1038/s10038-021-00937-7] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/10/2021] [Revised: 05/10/2021] [Accepted: 05/10/2021] [Indexed: 11/08/2022]
Abstract
Silver-Russell syndrome (SRS) is a congenital disorder characterized by prenatal and postnatal growth failure and craniofacial features. Hypomethylation of the H19/IGF2:IG-differential methylated region (H19LOM) is observed in 50% of SRS patients, and 15% of SRS patients with H19LOM had multilocus imprinting disturbance (MLID). Schimke immuno-osseous dysplasia (SIOD), characterized by spondyloepiphyseal dysplasia and nephropathy, is an autosomal recessive disorder caused by mutations in SMARCAL1 on chromosome 2. We report a patient with typical SRS-related features, spondyloepiphyseal dysplasia, and severe nephropathy. Molecular analyses showed H19LOM, paternal uniparental isodisomy of chromosome 2 (iUPD(2)pat), and a paternally inherited homozygous frameshift variant in SMARCAL1. Genome-wide methylation analysis showed MLID in this patient, although it showed no MLID in another patient with SIOD without SRS phenotype. These results suggest that iUPD(2)pat unmasked the recessive mutation in SMARCAL1 and that the SMARCAL1 gene mutation may have no direct effect on the patient's methylation defects.
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Souzeau E, Dubowsky A, Ruddle JB, Craig JE. Primary congenital glaucoma due to paternal uniparental isodisomy of chromosome 2 and CYP1B1 deletion. Mol Genet Genomic Med 2019; 7:e774. [PMID: 31251480 PMCID: PMC6687653 DOI: 10.1002/mgg3.774] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/26/2019] [Revised: 04/15/2019] [Accepted: 04/22/2019] [Indexed: 11/24/2022] Open
Abstract
Background CYP1B1 variants and deletions are the most common cause of primary congenital glaucoma (PCG). Methods We investigated an individual with PCG from the Australian and New Zealand Registry of Advanced Glaucoma. We performed sequencing of the CYP1B1 gene, followed by Multiplex Ligation‐dependent Probe Amplification and SNP array. Results We identified a homozygous deletion of the CYP1B1 gene by Multiplex Ligation‐dependent Probe Amplification and confirmed that the father was heterozygous for a CYP1B1 deletion but the mother had normal gene copy number. SNP array identified paternal uniparental isodisomy of the entire chromosome 2. Conclusions This study is the first report of a homozygous CYP1B1 whole gene deletion due to paternal uniparental isodisomy of chromosome 2 as a cause of PCG. These results illustrate the importance of genetic testing in providing appropriate genetic counseling regarding the risks of recurrence.
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Affiliation(s)
- Emmanuelle Souzeau
- Department of Ophthalmology, Flinders University, Flinders Medical Centre, Adelaide, South Australia, Australia
| | - Andrew Dubowsky
- SA Pathology, Flinders Medical Centre, Adelaide, South Australia, Australia
| | - Jonathan B Ruddle
- Centre for Eye Research Australia, Royal Victorian Eye and Ear Hospital, University of Melbourne, Melbourne, Victoria, Australia.,Ophthalmology, Department of Surgery, University of Melbourne, Melbourne, Victoria, Australia.,Department of Ophthalmology, Royal Children's Hospital, Melbourne, Victoria, Australia
| | - Jamie E Craig
- Department of Ophthalmology, Flinders University, Flinders Medical Centre, Adelaide, South Australia, Australia
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Bens S, Kolarova J, Beygo J, Buiting K, Caliebe A, Eggermann T, Gillessen-Kaesbach G, Prawitt D, Thiele-Schmitz S, Begemann M, Enklaar T, Gutwein J, Haake A, Paul U, Richter J, Soellner L, Vater I, Monk D, Horsthemke B, Ammerpohl O, Siebert R. Phenotypic spectrum and extent of DNA methylation defects associated with multilocus imprinting disturbances. Epigenomics 2016; 8:801-16. [PMID: 27323310 DOI: 10.2217/epi-2016-0007] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022] Open
Abstract
AIM To characterize the genotypic and phenotypic extent of multilocus imprinting disturbances (MLID). MATERIALS & METHODS We analyzed 37 patients with imprinting disorders (explorative cohort) for DNA methylation changes using the Infinium HumanMethylation450 BeadChip. For validation, three independent cohorts with imprinting disorders or cardinal features thereof were analyzed (84 patients with imprinting disorders, 52 with growth disorder, 81 with developmental delay). RESULTS In the explorative cohort 21 individuals showed array-based MLID with each one displaying an Angelman or Temple syndrome phenotype, respectively. Epimutations in ZDBF2 and FAM50B were associated with severe MLID regarding number of affected regions. By targeted analysis we identified methylation changes of ZDBF2 and FAM50B also in the three validation cohorts. CONCLUSION We corroborate epimutations in ZDBF2 and FAM50B as frequent changes in MLID whereas these rarely occur in other patients with cardinal features of imprinting disorders. Moreover, we show cell lineage specific differences in the genomic extent of FAM50B epimutation.
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Affiliation(s)
- Susanne Bens
- Institute of Human Genetics, Christian-Albrechts-University Kiel & University Hospital Schleswig-Holstein, Campus Kiel, D 24105 Kiel, Germany
| | - Julia Kolarova
- Institute of Human Genetics, Christian-Albrechts-University Kiel & University Hospital Schleswig-Holstein, Campus Kiel, D 24105 Kiel, Germany
| | - Jasmin Beygo
- Institut für Humangenetik, Universitätsklinikum Essen, Universität Duisburg-Essen, D 45122 Essen, Germany
| | - Karin Buiting
- Institut für Humangenetik, Universitätsklinikum Essen, Universität Duisburg-Essen, D 45122 Essen, Germany
| | - Almuth Caliebe
- Institute of Human Genetics, Christian-Albrechts-University Kiel & University Hospital Schleswig-Holstein, Campus Kiel, D 24105 Kiel, Germany
| | - Thomas Eggermann
- Institute of Human Genetics, University Hospital Aachen, D 52074 Aachen, Germany
| | | | - Dirk Prawitt
- Section of Molecular Pediatrics University Medical Centre of the Johannes Gutenberg-University Mainz, D 55131 Mainz, Germany
| | - Susanne Thiele-Schmitz
- Division of Experimental Paediatric Endocrinology & Diabetes, Department of Paediatrics, University of Lübeck, D 23562 Lübeck, Germany
| | - Matthias Begemann
- Institute of Human Genetics, University Hospital Aachen, D 52074 Aachen, Germany
| | - Thorsten Enklaar
- Section of Molecular Pediatrics University Medical Centre of the Johannes Gutenberg-University Mainz, D 55131 Mainz, Germany
| | - Jana Gutwein
- Institute of Human Genetics, Christian-Albrechts-University Kiel & University Hospital Schleswig-Holstein, Campus Kiel, D 24105 Kiel, Germany
| | - Andrea Haake
- Institute of Human Genetics, Christian-Albrechts-University Kiel & University Hospital Schleswig-Holstein, Campus Kiel, D 24105 Kiel, Germany
| | - Ulrike Paul
- Institute of Human Genetics, Christian-Albrechts-University Kiel & University Hospital Schleswig-Holstein, Campus Kiel, D 24105 Kiel, Germany
| | - Julia Richter
- Institute of Human Genetics, Christian-Albrechts-University Kiel & University Hospital Schleswig-Holstein, Campus Kiel, D 24105 Kiel, Germany
| | - Lukas Soellner
- Institute of Human Genetics, University Hospital Aachen, D 52074 Aachen, Germany
| | - Inga Vater
- Institute of Human Genetics, Christian-Albrechts-University Kiel & University Hospital Schleswig-Holstein, Campus Kiel, D 24105 Kiel, Germany
| | - David Monk
- Institut d'Investigació Biomedica de Bellvitge (IDIBELL), Cancer Epigenetic & Biology Program (PEBC), Catalan Institute of Oncology, Hospital Duran i Reynals Barcelona, Barcelona, ES 08907, Spain
| | - Bernhard Horsthemke
- Institut für Humangenetik, Universitätsklinikum Essen, Universität Duisburg-Essen, D 45122 Essen, Germany
| | - Ole Ammerpohl
- Institute of Human Genetics, Christian-Albrechts-University Kiel & University Hospital Schleswig-Holstein, Campus Kiel, D 24105 Kiel, Germany
| | - Reiner Siebert
- Institute of Human Genetics, Christian-Albrechts-University Kiel & University Hospital Schleswig-Holstein, Campus Kiel, D 24105 Kiel, Germany
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Fu XJ, Morisada N, Hashimoto F, Taniguchi-Ikeda M, Hashimura Y, Ohtsubo H, Ninchoji T, Kaito H, Nozu K, Takahashi E, Nakanishi K, Kurahashi H, Iijima K. A patient with autosomal recessive Alport syndrome due to segmental maternal isodisomy. Hum Genome Var 2014; 1:14006. [PMID: 27081500 PMCID: PMC4785521 DOI: 10.1038/hgv.2014.6] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/22/2014] [Revised: 06/12/2014] [Accepted: 06/13/2014] [Indexed: 12/11/2022] Open
Abstract
We report the case of a 22-year-old male with autosomal recessive Alport syndrome. Molecular analysis showed that this patient has a homozygous missense (NM_000091.4:c.3266G>A) Gly1089Asp mutation in the COL4A3 gene. The proband inherited the mutation from his heterozygous carrier mother, whereas the father carried only wild-type alleles. We performed comparative genome hybridization and single-nucleotide polymorphism microarray analyses and confirmed that there was partial maternal isodisomy.
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Affiliation(s)
- Xue J Fu
- Department of Pediatrics, Kobe University Graduate School of Medicine , Chuo-ku, Kobe, Japan
| | - Naoya Morisada
- Department of Pediatrics, Kobe University Graduate School of Medicine , Chuo-ku, Kobe, Japan
| | - Fusako Hashimoto
- Department of Pediatrics, Kakogawa West City Hospital , Yoneda-cho, Kakogawa, Japan
| | - Mariko Taniguchi-Ikeda
- Department of Pediatrics, Kobe University Graduate School of Medicine , Chuo-ku, Kobe, Japan
| | - Yuya Hashimura
- Department of Pediatrics, Takatsuki General Hospital , Kosobe-cho, Takatsuki, Japan
| | - Hiromi Ohtsubo
- Department of Pediatrics, Kobe University Graduate School of Medicine , Chuo-ku, Kobe, Japan
| | - Takeshi Ninchoji
- Department of Pediatrics, Kobe University Graduate School of Medicine , Chuo-ku, Kobe, Japan
| | - Hiroshi Kaito
- Department of Pediatrics, Kobe University Graduate School of Medicine , Chuo-ku, Kobe, Japan
| | - Kandai Nozu
- Department of Pediatrics, Kobe University Graduate School of Medicine , Chuo-ku, Kobe, Japan
| | - Eihiko Takahashi
- Department of Nephrology, Kanagawa Children's Medical Center, Mutsukawa , Minami-ku, Yokohama, Japan
| | - Koichi Nakanishi
- Department of Pediatrics, Wakayama Medical University , Wakayama, Japan
| | - Hiroki Kurahashi
- Division of Molecular Genetics, Institute for Comprehensive Medical Science, Fujita Health University , Kutsukake-cho, Toyoake, Japan
| | - Kazumoto Iijima
- Department of Pediatrics, Kobe University Graduate School of Medicine , Chuo-ku, Kobe, Japan
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King JE, Dexter A, Gadi I, Zvereff V, Martin M, Bloom M, Vanderver A, Pizzino A, Schmidt JL. Maternal uniparental isodisomy causing autosomal recessive GM1 gangliosidosis: a clinical report. J Genet Couns 2014; 23:734-41. [PMID: 24777551 DOI: 10.1007/s10897-014-9720-9] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/13/2013] [Accepted: 03/25/2014] [Indexed: 01/18/2023]
Abstract
Uniparental disomy is a genetic cause of disease that may result in the inheritance of an autosomal recessive condition. A child with developmental delay and hypotonia was seen and found to have severely abnormal myelination. Lysosomal enzyme testing identified an isolated deficiency of beta-galactosidase. Subsequently, homozygous missense mutations in the galactosidase, beta 1 (GLB1) gene on chromosome 3 were found. Parental testing confirmed inheritance of two copies of the same mutated maternal GLB1 gene, and no paternal copy. SNP analysis was also done to confirm paternity. The patient was ultimately diagnosed with autosomal recessive GM1 gangliosidosis caused by maternal uniparental isodisomy. We provide a review of this patient and others in which uniparental disomy (UPD) of a non-imprinted chromosome unexpectedly caused an autosomal recessive condition. This is the first case of GM1 gangliosidosis reported in the literature to have been caused by UPD. It is important for genetic counselors and other health care providers to be aware of the possibility of autosomal recessive disease caused by UPD. UPD as a cause of autosomal recessive disease drastically changes the recurrence risk for families, and discussions surrounding UPD can be complex. Working with families to understand UPD when it occurs requires a secure and trusting counselor-family relationship.
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Affiliation(s)
- Jessica E King
- Department of Neurology, Children's National Medical Center, 111 Michigan Ave. NW, Washington, DC, 20010, USA
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Carmichael H, Shen Y, T T, Hirschhorn JN, Dauber A. Whole exome sequencing in a patient with uniparental disomy of chromosome 2 and a complex phenotype. Clin Genet 2013; 84:213-22. [PMID: 23167750 PMCID: PMC3996682 DOI: 10.1111/cge.12064] [Citation(s) in RCA: 27] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/26/2012] [Revised: 11/15/2012] [Accepted: 11/15/2012] [Indexed: 12/11/2022]
Abstract
Whole exome sequencing and chromosomal microarrays are two powerful technologies that have transformed the ability of researchers to search for potentially causal variants in human disease. This study combines these tools to search for causal variants in a patient found to have maternal uniparental isodisomy of chromosome 2. This subject has a complex phenotype including skeletal and renal dysplasia, immune deficiencies, growth failure, retinal degeneration and ovarian insufficiency. Eighteen non-synonymous, rare homozygous variants were identified on chromosome 2. Additionally, five genes with compound heterozygous mutations were detected on other chromosomes that could lead to a disease phenotype independent of the uniparental disomy found in this case. Several candidate genes with potential connection to the phenotype are described but none are definitively proven to be causal. This study highlights the potential for detection of a large number of candidate genes using whole exome sequencing complicating interpretation in both the research and clinical settings. Forums must be created for publication and sharing of detailed phenotypic and genotypic reports to facilitate further biological discoveries and clinical counseling.
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Affiliation(s)
| | - Yiping Shen
- Department of Laboratory Medicine, Boston Children's Hospital
- Department of Pathology, Harvard Medical School
| | - Thutrang T
- Division of Endocrinology, Boston Children’s Hospital
- Center for Basic and Translational Obesity Research, Boston Children’s Hospital
| | - Joel N Hirschhorn
- Division of Endocrinology, Boston Children’s Hospital
- Program in Medical and Population Genetics, Broad Institute
- Center for Basic and Translational Obesity Research, Boston Children’s Hospital
- Department of Genetics, Harvard Medical School
| | - Andrew Dauber
- Division of Endocrinology, Boston Children’s Hospital
- Program in Medical and Population Genetics, Broad Institute
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Haudry C, de Lonlay P, Malan V, Bole-Feysot C, Assouline Z, Pruvost S, Brassier A, Bonnefont JP, Munnich A, Rötig A, Lebre AS. Maternal uniparental disomy of chromosome 2 in a patient with a DGUOK mutation associated with hepatocerebral mitochondrial DNA depletion syndrome. Mol Genet Metab 2012; 107:700-4. [PMID: 23141463 DOI: 10.1016/j.ymgme.2012.10.008] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/23/2012] [Revised: 10/10/2012] [Accepted: 10/10/2012] [Indexed: 12/11/2022]
Abstract
We report maternal uniparental disomy of chromosome 2 (matUPD2) in a 9-month-old girl presenting with hepatocerebral mitochondrial DNA depletion syndrome. This patient was homozygous for the c.352C>T (p.Arg118Cys) mutation in DGUOK gene. The proband's mother was heterozygous for the mutation was absent in DNA of the father. For proband, the absence of paternal contribution at the DGUOK locus prompted us to exclude intragenic DGUOK deletion of the paternal allele with Multiplex ligation-dependent probe amplification (MLPA) analysis. We also excluded non-paternity by studying various markers at different loci. Then we performed an analysis of copy number variations and absence of heterozygosity (AOH) on the proband DNA using high resolution oligonucleotides microarray. Several large regions of AOH with no copy number change were detected on chromosome 2 and one of these AOH regions encompassed DGUOK gene. These results were confirmed with haplotype analysis using polymorphic markers. Informative SNPs and microsatellites markers spanning the whole chromosome 2 showed a matUPD2 with heterodisomy and isodisomy regions, the absence of paternal allele and presence of two maternal alleles, with only one maternal allele on the region of DGUOK locus in 2p13.1. This is the first demonstration of matUPD2 with segmental isodisomy at 2p13.1 locus in hepatocerebral mitochondrial DNA depletion syndrome. The identification of UPD2 will impact genetic counseling for the proband's parents. Because the recurrence risk for UPD2 is very low, the risk for disease in further offspring for this couple is negligible.
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Affiliation(s)
- Coralie Haudry
- Assistance Publique-Hôpitaux de Paris, Services de Génétique, de Cytogénétique et de Maladies Métaboliques, Hôpital Necker-Enfants Malades, 149, rue de Sèvres 75743 Paris cedex 15, France
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10
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Ou X, Liu C, Chen S, Yu J, Zhang Y, Liu S, Sun H. Complete paternal uniparental isodisomy for Chromosome 2 revealed in a parentage testing case. Transfusion 2012; 53:1266-9. [PMID: 22924962 DOI: 10.1111/j.1537-2995.2012.03863.x] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
Abstract
BACKGROUND Uniparental disomy (UPD) is a rare cytogenetic event that has previously been reported mostly via genetic analysis of patients with phenotypes of recessive diseases. The incidence of UPD of any chromosome is estimated to be approximately1:3500 live births. CASE REPORT In a case of disputed paternity involving a phenotypically normal male child, mother-child exclusions were observed at five short tandem repeat markers, which were all located on Chromosome 2. Ten additional dinucleotide repeat markers spanning both arms of Chromosome 2 were investigated. The results revealed that the child was homozygous for all markers tested with all alleles originating from a single paternal Chromosome 2, which was consistent with paternal UPD for Chromosome 2. CONCLUSION This case and other previous reports demonstrate that UPD poses a high risk for false exclusion and incorrect expert opinion. Furthermore, this case highlights that a conclusion of exclusion of paternity or maternity should not be postulated if multiple genetic incompatibilities are located on the same chromosome because of the occurrence of UPD.
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Affiliation(s)
- Xueling Ou
- Department of Forensic Medicine, Zhongshan School of Medicine, Sun Yat-sen University, Guangzhou, PR China
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Loucks C, Parboosingh JS, Chong JX, Ober C, Siu VM, Hegele RA, Rupar CA, McLeod DR, Pinto A, Chudley AE, Innes AM. A shared founder mutation underlies restrictive dermopathy in Old Colony (Dutch-German) Mennonite and Hutterite patients in North America. Am J Med Genet A 2012; 158A:1229-32. [PMID: 22495976 DOI: 10.1002/ajmg.a.35302] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/24/2011] [Accepted: 01/01/2012] [Indexed: 11/06/2022]
Affiliation(s)
- Catrina Loucks
- Department of Medical Genetics, Alberta Children's Hospital and Alberta Children's Hospital Research Institute for Child and Maternal Health, University of Calgary, Calgary, Alberta, Canada
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