National Center for Advancing and Translational Sciences Genetic and Rare Diseases Information Center, a program of the National Center for Advancing and Translational Sciences

Triploidy


Other Names:
Triploid syndrome; Triploidy syndrome; Chromosome triploidy syndrome
Categories:
Triploidy is a chromosome abnormality that occurs when there is an extra set of chromosomes present in each cell. Most pregnancies affected by triploidy are lost through early miscarriage. However, reports exist of some affected babies living up to five months. Those that survive are often mosaic. The signs and symptoms associated with triploidy vary but may include a variety of birth defects and an unusually small size. This condition does not run in families and is not associated with maternal or paternal age. Treatment is based on the signs and symptoms present in each person.[1][2]
Last updated: 10/11/2015

This table lists symptoms that people with this disease may have. For most diseases, symptoms will vary from person to person. People with the same disease may not have all the symptoms listed. This information comes from a database called the Human Phenotype Ontology (HPO) . The HPO collects information on symptoms that have been described in medical resources. The HPO is updated regularly. Use the HPO ID to access more in-depth information about a symptom.

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Medical Terms Other Names
Learn More:
HPO ID
80%-99% of people have these symptoms
Abnormality of chromosome segregation 0002916
Abnormality of the fontanelles or cranial sutures 0000235
Cryptorchidism
Undescended testes
Undescended testis
[ more ] 		0000028
Decreased skull ossification
Decreased bone formation of skull
0004331
Hypertelorism
Wide-set eyes
Widely spaced eyes
[ more ] 		0000316
Hypoplasia of penis
Underdeveloped penis
0008736
Hypospadias 0000047
Intrauterine growth retardation
Prenatal growth deficiency
Prenatal growth retardation
[ more ] 		0001511
Low-set, posteriorly rotated ears 0000368
Wide mouth
Broad mouth
Large mouth
[ more ] 		0000154
30%-79% of people have these symptoms
Aplasia/Hypoplasia affecting the eye
Absent/small eye
Absent/underdeveloped eye
[ more ] 		0008056
Cataract
Clouding of the lens of the eye
Cloudy lens
[ more ] 		0000518
Cleft palate
Cleft roof of mouth
0000175
Finger syndactyly 0006101
Hepatomegaly
Enlarged liver
0002240
Iris coloboma
Cat eye
0000612
Macroglossia
Abnormally large tongue
Increased size of tongue
Large tongue
[ more ] 		0000158
Micrognathia
Little lower jaw
Small jaw
Small lower jaw
[ more ] 		0000347
Narrow chest
Low chest circumference
Narrow shoulders
[ more ] 		0000774
Non-midline cleft lip 0100335
Omphalocele 0001539
Polyhydramnios
High levels of amniotic fluid
0001561
5%-29% of people have these symptoms
Abnormal cardiac septum morphology 0001671
Abnormality of the gallbladder 0005264
Abnormality of the pancreas 0001732
Ambiguous genitalia
Ambiguous external genitalia
Ambiguous external genitalia at birth
Intersex genitalia
[ more ] 		0000062
Aplasia/Hypoplasia of the corpus callosum 0007370
Holoprosencephaly 0001360
Hydrocephalus
Too much cerebrospinal fluid in the brain
0000238
Intestinal malrotation 0002566
Macrocephaly
Increased size of skull
Large head
Large head circumference
[ more ] 		0000256
Meningocele 0002435
Narrow mouth
Small mouth
0000160
Short neck
Decreased length of neck
0000470
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Last updated: 7/1/2020

Support and advocacy groups can help you connect with other patients and families, and they can provide valuable services. Many develop patient-centered information and are the driving force behind research for better treatments and possible cures. They can direct you to research, resources, and services. Many organizations also have experts who serve as medical advisors or provide lists of doctors/clinics. Visit the group’s website or contact them to learn about the services they offer. Inclusion on this list is not an endorsement by GARD.

Organizations Supporting this Disease

These resources provide more information about this condition or associated symptoms. The in-depth resources contain medical and scientific language that may be hard to understand. You may want to review these resources with a medical professional.

Where to Start

  • The National Organization for Rare Disorders (NORD) has a report for patients and families about this condition. NORD is a patient advocacy organization for individuals with rare diseases and the organizations that serve them.
  • Unique is a source of information and support to families and individuals affected by rare chromosome disorders. Click on the link to view information about triploidy.

In-Depth Information

  • The Monarch Initiative brings together data about this condition from humans and other species to help physicians and biomedical researchers. Monarch’s tools are designed to make it easier to compare the signs and symptoms (phenotypes) of different diseases and discover common features. This initiative is a collaboration between several academic institutions across the world and is funded by the National Institutes of Health. Visit the website to explore the biology of this condition.
  • Orphanet is a European reference portal for information on rare diseases and orphan drugs. Access to this database is free of charge.
  • PubMed is a searchable database of medical literature and lists journal articles that discuss Triploidy. Click on the link to view a sample search on this topic.

Questions sent to GARD may be posted here if the information could be helpful to others. We remove all identifying information when posting a question to protect your privacy. If you do not want your question posted, please let us know.

  1. Triploid Syndrome. National Organization for Rare Disorders. 2003; http://rarediseases.org/rare-diseases/triploid-syndrome/.
  2. Stanislawa Weremowicz, PhD. Congenital cytogenetic abnormalities. UpToDate. November 2014; Accessed 10/11/2015.