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15Q11.2 Microduplications

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15Q11.2 Microduplications Inform Network Support Rare Chromosome Disorder Support Group The Stables, Station Road West, Oxted, Surrey RH8 9EE, UK Tel: +44(0)1883 723356 [email protected] I www.rarechromo.org Join Unique for family links, information and support. Unique is a charity without government funding, existing entirely on donations and grants. If you can, please make a donation via our website at http://www.rarechromo.org/html/donate Please help us to help you! Websites, Facebook groups http://www.dup15q.org/Dup15q Dup15q Alliance provides family support and promotes awareness, research and targeted treatments for chromosome 15q duplication syndromes. Microduplication 15q11.2 Parent Support: 15q11.2 https://www.facebook.com/groups/1482240128719818/ 15q11.2 Advocacy, Research, and Support: https://www.facebook.com/groups/1419874888238714/ Microduplications Duplication 15q11.2 Network: https://www.facebook.com/15q112/ Unique mentions other organisations’ message boards and websites to help families looking for information. This does not imply that we endorse their content or have any responsibility for it. This information guide is not a substitute for personal medical advice. Families should consult a medically qualified clinician in all matters relating to genetic diagnosis, management and health. Information on genetic changes is a very fast-moving field and while the information in this guide is believed to be the best available at the time of publication, some facts may later change. Unique does its best to keep abreast of changing information and to review its published guides as needed. This booklet was compiled by Unique (AP) and reviewed by Professor M. G. Butler M.D., Ph.D., Division of Research and Genetics, Director KUMC Genetics Clinic, Professor of Psychiatry, Behavioral Sciences and Pediatrics, ABMG Certified Clinical Geneticist and Clinical Cytogeneticist, Department of Psychiatry and Behavioral Sciences, School of Medicine, The University of Kansas Medical Center, Kansas City, Kansas, USA. Version 1 2019 (AP) Copyright © Unique 2019 Rare Chromosome Disorder Support Group Charity Number 1110661 Registered in England and Wales Company Number 5460413 rarechromo.org 24 Genetic information Detailed genetic information 15q11.2 microduplications Chromosome Position Important Microduplication A 15q11.2 microduplication is a rare genetic condition caused by the duplication 15 Mb genes examples of a small piece of genetic material from one of the body’s 46 chromosomes – chromosome 15. This diagram was GOLGA6L6 generated using For typical development, chromosomes should contain the expected amount of P13 Human genome build genetic material (DNA). Like many other chromosome disorders, having an extra p arm 21.00 Mb GRCh37/hg19 which piece of chromosome 15 may affect a child’s health, development and P12 POTEB2 was released in intellectual abilities. The symptoms observed in people with a 15q11.2 February 2009. If your p11.2 microduplication are variable and depend on a number of factors including what genetic report was p11.1 issued prior to this and how much DNA is duplicated. 21.50 Mb q11.1 (e.g. hg18) or following the q11.2 15q11.2 Background on chromosomes publication of this q12 Our bodies are made up of different types of cells, almost all of which contain guide (e.g. hg38) the 22.00 Mb the same chromosomes. Each chromosome consists of DNA that codes for our q13.1 POTEB position of your genes. Genes can be thought of as individual instruction booklets that contain all q13.2 duplication may have q13.3 OR4M2 the genetic information that tells the body how to develop, grow and function. changed slightly. q14 OR4N4 22.50 Mb Chromosomes come in pairs with one q15.1 These are examples of q15.2 member of each chromosome pair being GOLGA6L1 the most common inherited from each parent. Most cells of q15.3 TUBGCP5 duplications. They can q21.1 CYFIP1 vary in size but all the human body have a total of 46 q arm q21.2 23.00 Mb contain the TUBGCP5, chromosomes (23 pairs). Eggs and sperm, NIPA2 q21.3 CYFIP1, NIPA2 and NIPA1 NIPA1 genes often however, have 23 unpaired chromosomes, q22.1 referred to as the so that when they join together at q22.2 Burnside-Butler region. conception, the chromosomes pair up to q22.31 23.50 Mb q22.32 GOLGA8S make a total of 46. q22.33 GOLGA6L2 These are examples of q23 MKRN3 Chromosome pairs are numbered 1 to 22 q24.1 MAGEL2 less commonly identified rd q24.2 NDN microduplications. They and the 23 pair comprises the sex q24.3 24.00 Mb q25.1 vary in size but all chromosomes that determine biological Chromosomes pairs 1-22, X and Y (male) q25.2 contain the MAGEL2 sex. Males usually have one X chromosome Chromosome pair 15 is circled in red q25.3 gene. and one Y chromosome (XY), and females q26.1 usually have two X chromosomes (XX). q26.2 24.50 Mb q26.3 Sources NPAP1 The information in this booklet is drawn from published medical literature, 25.00 Mb databases and Unique members. The first-named author and publication date from articles are given to allow you to look for the abstracts or original articles SNRPN Unique currently has one SNURF member with an SNRPN on the internet in PubMed (http://www.ncbi.nlm. nih.gov/pubmed). If you wish, duplication and one you can obtain most articles from Unique. Information gathered from DECIPHER 25.50 Mb family with a larger (DatabasE of genomiC varIation and Phenotype in Humans using Ensembl duplication that includes Resources) is open access and can be found at https://decipher.sanger.ac.uk. UBE3A NDN, SNRPN, SNURF and UBE3A. 20 families completed a Unique survey in 2018. 2 23 Gene Information Genetic information The TUBGCP5 (tubulin gamma complex associated protein 5) gene has been Looking at 15q11.2 associated with attention deficit hyperactivity disorder (ADHD) and obsessive Chromosomes can’t be seen with the naked eye but if cells are prepared in a compulsive disorder (OCD) (de Wolf 2013). specific way, the chromosomes can be stained and viewed under a microscope Studies using cells from people with the Burnside-Butler 15q11.2 microdeletion to show a distinctive pattern of light and dark bands. You can see the banding showed abnormalities of dendritic spine (parts of neurons that help transmit pattern for each chromosome in the image on page 2, and a more detailed electrical signals) formation indicating a role in neurodevelopment (Das 2015). diagrammatical view for chromosome 15 in the image below. MAGEL2 and NDN Chromosome 15 Alterations to the MAGEL2 (MAGE family member L2) gene causes a p arm q arm neurological disorder called Schaaf-Yang syndrome, symptoms include global developmental delay/intellectual disability, sleep apnoea, hypotonia and feeding difficulties during infancy. Some children with MAGEL2 alterations have autism spectrum disorder (ASD). MAGEL2 has also been associated with congenital arthrogryposis multiplex, which is when babies are born with two or more joint P12 p11.2 p11.1 q11.1 q12 q13.1 q13.2 q13.3 q14 q15.1 q15.2 q15.3 q21.1 q21.2 q21.3 q22.1 q22.2 q22.31 q22.32 q22.33 q23 q24.1 q24.2 q24.3 q25.1 q25.2 q25.3 q26.1 q26.2 q26.3 contractures (curvatures). A microduplication containing this gene has been P13 associated with autistic behaviour, global developmental delay and delayed Each chromosome has a short (p) arm and a long (q) arm. Bands are numbered speech and language development. outwards starting from where the short and long arms meet, at a point called This gene is maternally imprinted which means, only the copy inherited from the the centromere (coloured yellow in the image above). Region q11.2 is close to father is active, the copy inherited from the mother is ‘silenced’. The paternal the centromere on the long arm (q) of chromosome 15 (shaded pink in the image copy of this gene is active in several fetal tissues including the brain (Boccaccio above). 1999, Lee 2000). Possible symptoms caused by a duplication of this gene would Duplications in region 15q11.2 hence only be expected if the gene inherited from the father was duplicated. The duplications discussed in this information guide are commonly referred to The situation is similar for NDN, another maternally imprinted gene important as 15q11.2 microduplications. There are regions in this part of chromosome 15 for proper neurological function (MacDonald and Wevrick 1997, Jay 1997, where breakage and duplication are more likely to occur (due to repetitive Nakada 1998, Gerard 1999, Muscatelli 2000, Lee 2005). pieces of DNA), so some people will have very similar duplications. Others will SNRPN and SNURF have a slightly larger or smaller duplication, or a different duplication in the SNRPN (small nuclear ribonucleoprotein polypeptide N) and SNURF (SNRPN same chromosomal band that contains different genes (as shown in the image upstream reading frame) genes overlap each other, which means some of the below). Families who receive a slightly different genetic test result, such as a information (coding DNA sequence) they use is the same. SNRPN is maternally larger 15q11.2q12 duplication may find our 15q11q13 duplication guide more imprinted so only the gene inherited from the father is active, and is highly appropriate since a duplication that includes DNA from the chromosomal band expressed in the brain and heart (Rodriguez-Jato 2005). SNURF is also 15q12 includes a number of other significant genes. maternally imprinted. Unique has one member with a duplication of the SNRPN Important genes in 15q11.2 and example duplications gene who has developmental delay, intellectual impairment and a congenital heart defect. 15q11.2 UBE3A GOLGA6L6 OR4N4 TUBGCP5 NIPA2 GOLGA8I MKRN3 NDN NPAP1 SNURF The UBE3A (Ubiquitin-protein ligase E3A) gene shows a varied imprinted PO2EB2 CYFIP1 NIPA1 GOLGA6L2 MAGEL2 SNRPN UBE3A pattern, the gene inherited from the mother is expressed in the neurons of the embryonic brain (Dindot 2008) but the gene inherited from either parent can be expressed in glial cells (Yamasaki 2003).
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