Hereditary Diseases
Hereditary diseases are medical conditions caused by genetic changes that can be passed from parents to their children. Some inherited conditions are present in a family for generations, while others may appear for the first time because of a new genetic change. Fetal medicine and genetic counseling can help families understand hereditary disease risks and available testing options before and during pregnancy.
Hereditary diseases are conditions associated with genetic changes that may be transmitted from one generation to another. The way a condition is inherited depends on the specific gene and genetic change involved. Some people can carry a genetic variant without having symptoms themselves.
Genetic conditions can follow different inheritance patterns, including autosomal dominant, autosomal recessive, X-linked and other patterns. Understanding the inheritance pattern is important when estimating the possible risk to a pregnancy and deciding whether genetic testing may be appropriate.
In an autosomal dominant condition, a disease-causing genetic variant in one copy of a particular gene can be sufficient to cause the condition. When one parent is known to carry a relevant variant, genetic counseling can help explain the possible inheritance risk for each pregnancy.
Autosomal recessive conditions generally occur when a child inherits disease-causing variants in both copies of a particular gene. Parents who carry one altered copy may have no symptoms. Conditions such as some forms of thalassaemia, sickle cell disease and cystic fibrosis can follow an autosomal recessive inheritance pattern.
X-linked conditions are associated with genetic changes on the X chromosome. The inheritance and potential effects can differ between male and female pregnancies, depending on the specific condition. Specialist genetic counseling can help families understand the inheritance pattern and available testing.
A genetic carrier has a disease-associated variant but may not have the associated condition. Carrier status is particularly important for recessive conditions because when both biological parents carry relevant variants in the same gene, the pregnancy may have an increased chance of being affected.
A detailed family history can provide important clues about inherited disease risk. Information about genetic conditions, unexplained childhood illnesses, developmental disorders, repeated pregnancy losses or previous children affected by a genetic condition may help guide further assessment.
Genetic counseling may be considered when there is a known genetic condition in the family, a previous pregnancy or child affected by a genetic disorder, known carrier status in one or both parents, or an ultrasound finding that raises concern for a genetic condition.
Genetic assessment before conception can be particularly useful when a couple already knows about an inherited condition in the family. Understanding the possible inheritance pattern before pregnancy can provide time to discuss carrier testing, reproductive options and appropriate prenatal testing.
When an inherited disease is suspected during pregnancy, the fetal medicine team can review the family history, previous genetic reports, ultrasound findings and available screening results. Further genetic testing may then be considered according to the specific clinical situation.
A previous pregnancy or child affected by a confirmed or suspected genetic condition is an important reason for specialist genetic evaluation. Previous laboratory reports, genetic test results and available DNA or tissue samples can sometimes help determine the most appropriate testing strategy in a subsequent pregnancy.
Carrier screening can identify whether an individual carries genetic variants associated with selected inherited conditions. Depending on the test, screening may include conditions such as thalassaemia, sickle cell disease, cystic fibrosis, spinal muscular atrophy and other hereditary disorders.
Thalassaemia is an inherited blood disorder affecting haemoglobin production. A person may carry a thalassaemia-related genetic change without having significant symptoms. If one parent is identified as a carrier, assessment of the other biological parent may help determine whether the pregnancy could be at increased risk.
Sickle cell disease is an inherited haemoglobin disorder. Sickle cell carrier status can be identified through appropriate testing, and when parental carrier status creates a potential risk to the pregnancy, genetic counseling and further testing can be discussed.
Cystic fibrosis is an inherited condition associated with changes in the CFTR gene. If there is a known family history or both biological parents are identified as carriers, specialist counseling can help explain the possible risk and available prenatal testing options.
Spinal muscular atrophy is a hereditary neuromuscular condition commonly associated with changes involving the SMN1 gene. Carrier screening can identify many carriers, although no genetic screening test detects every possible carrier in every situation.
Some neurological disorders can run in families because of inherited genetic changes. When a known neurological genetic condition is present in a family, specialist genetic assessment can help determine whether parental testing or prenatal diagnosis may be appropriate.
Certain metabolic diseases are caused by inherited changes affecting enzymes or other biological pathways. If a metabolic disorder has been diagnosed in a previous child or is known in the family, genetic counseling can help identify appropriate testing options for future pregnancies.
Some heart conditions can have a genetic basis and may occur in several members of a family. When there is a significant family history of inherited heart disease, appropriate genetic and fetal cardiac assessment may be considered during pregnancy.
Several blood disorders have a genetic basis. Thalassaemia and sickle cell disease are important examples of inherited haemoglobin disorders. Appropriate screening and partner assessment can help determine whether additional fetal genetic testing should be considered.
Some cancer predisposition syndromes are caused by inherited genetic variants. If a family has a known hereditary cancer syndrome, preconception or pregnancy genetic counseling may be appropriate to understand inheritance and available reproductive testing options.
Testing the parents can sometimes identify the specific genetic variant responsible for a known family condition. When the familial genetic change has been identified, targeted testing can often provide more focused information during pregnancy.
Prenatal screening estimates the chance of selected genetic or chromosomal conditions. Screening may include maternal blood tests, cell-free DNA testing and ultrasound. A screening result indicates an increased or reduced chance and does not by itself establish a diagnosis.
NIPT analyzes cell-free DNA from a maternal blood sample and is primarily used to screen for selected chromosomal conditions. It does not screen for every hereditary disease. When a pregnancy is at risk for a specific single-gene disorder, a different genetic testing approach may be required.
Chorionic villus sampling, or CVS, is a prenatal diagnostic procedure in which a small sample of placental tissue is obtained for genetic testing. It may be offered when there is an increased chance of a specific genetic or chromosomal condition, including situations involving family history or known parental genetic variants.
Amniocentesis involves obtaining a sample of amniotic fluid under ultrasound guidance. Depending on the clinical question, the sample can be tested for specific genetic or chromosomal conditions. The procedure and its potential risks are discussed before testing.
Screening and diagnostic testing have different purposes. Screening estimates the chance of a condition, while diagnostic testing is used to investigate whether a specific genetic or chromosomal condition is present. The appropriate test depends on the genetic concern and the information required.
For a limited number of specific genetic conditions, non-invasive prenatal diagnosis may be available in specialized settings. This approach uses a maternal blood sample and is different from standard NIPT screening. Availability depends on the condition and the laboratory testing approach.
Couples with a known hereditary condition may discuss preimplantation genetic testing for a monogenic condition as part of IVF treatment. This approach can be considered in selected circumstances after appropriate reproductive genetics counseling and identification of the familial genetic change.
Genetic counseling provides an opportunity to understand the family history, inheritance pattern, possible pregnancy risks and available testing options. Counseling can also help parents understand the limitations and possible outcomes of genetic tests before making decisions about testing.
Genetic results can include positive, negative, carrier, pathogenic or uncertain findings depending on the test performed. Results should be interpreted in the context of the individual's clinical history, family history and the specific genetic condition being investigated.
No single genetic test can detect every hereditary disease or every possible genetic change. The ability of a test to identify a condition depends on the genes and variants included, the testing method and the specific clinical question being investigated.
Detailed fetal ultrasound can identify structural abnormalities that may sometimes be associated with genetic conditions. However, many hereditary diseases do not produce visible ultrasound findings during pregnancy. Genetic testing may therefore be considered when there is a known familial risk even when the ultrasound appears normal.
Twin and higher-order pregnancies require individualized genetic assessment. The number of fetuses, chorionicity, family history and the specific hereditary condition can influence the choice of screening and diagnostic testing.
Couples with a known hereditary condition may benefit from genetic counseling before planning another pregnancy. Previous genetic reports can be reviewed to determine whether parental testing, carrier assessment, prenatal diagnosis or reproductive genetics options should be considered.
Promise Fetal Medicine & Pregnancy Scan Centre in Jalandhar provides specialized fetal medicine consultation for pregnancies with suspected or known hereditary disease risk. Assessment may include detailed review of family history, previous genetic reports, pregnancy ultrasound findings and discussion of appropriate genetic screening or diagnostic testing.
If you have a family history of an inherited condition, are a known carrier, have previously had a child or pregnancy affected by a genetic disorder, or have concerns following an ultrasound finding, a fetal medicine and genetics consultation can help you understand the available options. At Promise Fetal Medicine & Pregnancy Scan Centre, each pregnancy is assessed individually with appropriate counseling, ultrasound evaluation and referral for genetic testing when required.
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Hereditary Diseases are health conditions caused by genetic changes that can be passed from parents to their children. Some inherited conditions may run in families, while others can occur due to a new genetic change. Examples include thalassemia, sickle cell disease, cystic fibrosis, spinal muscular atrophy (SMA), and certain inherited metabolic or neurological disorders. Genetic testing and counseling can help identify potential risks, understand family history, and guide appropriate screening or diagnostic testing during pregnancy. At Promise Fetal Medicine & Pregnancy Scan Centre in Jalandhar, personalized genetic assessment can help families better understand hereditary conditions and available reproductive and prenatal testing options.
Director and Chief Fetal Medicine Specialist
Baby's Journey Through Pregnancy
