Modelled epidemiological data for selected congenital disorders in South Africa.

Congenital disorders (CD) remain an unprioritized health care issue in South Africa with national surveillance underreporting by > 95%. This lack of empiric data contributes to an underestimation of the CD disease burden, resulting in a lack of services for those affected. Modelling offers estimated figures for policymakers to plan services until surveillance is improved. This study applied the Modell Global Database (MGDb) method to quantify the South African CD disease burden in 2012. The MGDb combines birth prevalence data from well-established registries with local demographic data to generate national baseline estimates (birth prevalence and outcomes) for specific early-onset, endogenous CDs. The MGBd was adapted with local South African demographic data to generate baseline (no care) and current care national and provincial estimates for a sub-set of early-onset endogenous CDs. Access to care/impact of interventions was quantified using the infant mortality rate as proxy. With available care in 2012, baseline birth prevalence (27.56 per 1000 live births, n = 32,190) decreased by 7% with 2130 less affected births, with 5400 (17%) less under-5 CD-related deaths and 3530 (11%) more survivors at 5 years, including 4720 (15%) effectively cured and 1190 (4%) less living with disability. Results indicate a higher proportion of CD-affected births than currently indicated by national surveillance. By offering evidence-based estimates, the MGDb may be considered a tool for policymakers until accurate empiric data becomes available. Further work is needed on key CD groups and costing of specific interventions.

The case for the genetic nurse in South Africa.

The care and prevention of congenital disorders (CDs) is an emerging but unprioritised health need in South Africa (SA). Inadequate empirical data and underreporting conceal the true burden of CDs while medical genetic services to confront the problem have regressed. Positive epidemiological transition in the country now demands these services are improved to significantly further reduce child mortality. Current sector capacity in SA is inadequate and required personnel targets will not be reached quickly enough to meet the growing health need even if relevant posts are designated. Historically, genetic-trained nurses played a defined role in primary healthcare (PHC) by recognising and diagnosing common CDs and counselling patients and their families, while referring complex matters to the limited tertiary medical genetic services available. Policy changes to redress past inequalities and other healthcare priorities resulted in genetic services being incorporated into PHC, with few genetic nurses retaining their genetic services role. While the medium- to long-term aim for SA would be to develop medical genetic services with appropriate capacity at all levels of healthcare, there is an urgent short-term need to provide basic medical genetic services in PHC. Central to achieving this is the upgrading and re-implementation of the previously successful Medical Genetics Education Programme (MGEP). This post-graduate distance learning, education programme is implemented with the Congenital Disorders Course Book, a distance education tool promoting independent, home-based learning. Together, these tools offer an approach to swiftly build up a nursing workforce with improved knowledge and skills in medical genetics.

Prevention of Congenital Disorders and Care of Affected Children: A Consensus Statement.

As the Sustainable Development Goals are adopted by United Nations member states, children with congenital disorders remain left behind in policies, programs, research, and funding. Although this finding was recognized by the creation and endorsement of the 63rd World Health Assembly Resolution in 2010 calling on United Nations member states to strengthen prevention of congenital disorders and the improvement of care of those affected, there has been little to no action since then. The Sustainable Development Goals call for the global health and development community to focus first and foremost on the most vulnerable and those left behind in the Millennium Development Goal era. To maximize the opportunity for every woman and couple to have a healthy child and to reduce the mortality and severe disability associated with potentially avoidable congenital disorders and their consequences for the children affected, their families and communities, and national health care systems, we propose priority measures that should be taken urgently to address this issue.

Review of the 2015 Guidelines for Maternity Care with relevance to congenital disorders.

The 4th edition of the Guidelines for Maternal Care in South Africa published by the National Department of Health in 2015 was evaluated with relevance to the care and prevention of congenital disorders (CDs). Disparate terminology is used for CDs throughout the guidelines, and overall less detail is included on CDs compared with the previous edition. This demonstrates a lack of awareness around the growing health need and contribution of CDs to the disease burden in South Africa (SA). Referrals to medical genetic services in the guidelines for mothers of advanced maternal age and other high-risk categories do not take into account the insufficient capacity available for screening and diagnosis of CDs. This highlights the lack of consultation with the medical genetics sector during the development of the guidelines. To respond to the Sustainable Development Goals by 2030, CDs must be integrated comprehensively at all levels of healthcare in SA.

Delay and poor diagnosis of Down syndrome in KwaZulu-Natal, South Africa: A retrospective review of postnatal cytogenetic testing.

BACKGROUND: Down syndrome (DS) is the most common chromosomal disorder in newborns. Until 20 years ago DS was considered rare in black African children in South Africa (SA). Lack of awareness of DS on the part of medical staff in SA, and difficulty in diagnosing it, appear to persist. OBJECTIVES: To establish an epidemiological profile of DS and investigate the ability of clinicians in KwaZulu-Natal Province (KZN), SA, to make accurate clinical diagnoses of DS. METHODS: Records at the South African National Blood Service cytogenetic laboratory in Pinetown, KZN, were examined for all tests for clinically suspected DS undertaken during January 2009 - December 2013 and all cytogenetically proven DS test results. Age at diagnosis, the hospital from where the test was sent and type of chromosomal pattern for each confirmed DS test result were recorded. RESULTS: Of a total of 1 578 tests requested, 875 confirmed DS, indicating that clinicians correctly clinically diagnosed DS 55.4% of the time. The average age of cytogenetic diagnosis of DS was 1 year and 20 days. The minimum population prevalence of DS was 0.8/1 000. CONCLUSIONS: The diagnosis of DS is a challenge in KZN, potentiating missed opportunities for early intervention. The relatively low population prevalence of DS may be attributable to a lack of confirmatory cytogenetic tests or missed clinical diagnoses. It may also be attributable to a high mortality rate for children with DS in the province.

Constitutional; Legal and Regulatory Imperatives for the Renewed Care and Prevention of Congenital Disorders in South Africa

Medical genetic services for the care and prevention of congenital disorders have declined significantly in recent years due to competing health priorities; with previously developed services becoming compromised. With an infant mortality rate of 28/1 000 live births; South Africa (SA) has passed the threshold of 40/1 000 when such services should be implemented. This article outlines the international background and SA legislative framework for medical genetic services and their implementation. International; regional and national conventions; legislation; and policy were studied for relevance to genetic services and their implementation was evaluated; including a comparison of sector capacity between 2001 and 2015. A comprehensive legislative and regulatory framework exists in SA for the provision of medical genetic services; but implementation has been fragmented and unsustained. Congenital disorders and genetic services are not prominent in national strategies and excluded from interventions aimed at combating child mortality and non-communicable diseases. Capacity today is at a lower level than in 2001. The failure to recognise the burden of disease represented by congenital disorders is the underlying reason for the implementation and service shortfall. Child mortality rates have stagnated since 2011 and can be significantly further reduced by prioritising healthcare issues other than HIV/AIDS; including congenital disorders. It is now an imperative that SA responds to World Health Assembly Resolution 63.17 and prioritises congenital disorders as a healthcare issue; providing services to uphold the dignity and human rights of the most vulnerable members of society

Thyroid dysfunction in a cohort of South African children with Down syndrome.

BACKGROUND: While international studies show thyroid dysfunction occurs more commonly in individuals with Down syndrome (DS) than in the general population, there is a paucity of available data from sub-Saharan Africa. OBJECTIVES: To document the range of thyroid function in a cohort of South African children with DS, and to assess referral and treatment practices when thyroid dysfunction was present. METHODS: A retrospective file-based study of 391 children with DS seen at the genetic clinics at three Johannesburg hospitals from 2003 to 2008. Thyroid function test (TFT) results (thyroid-stimulating hormone and free thyroxine) and demographic details were collected for each child. Endocrine clinic files from two of the hospitals were reviewed for additional referral and treatment information. RESULTS: The majority (83.6%) of children had at least one TFT, in most cases performed between the ages of 2 and 12 months. The most common form of thyroid dysfunction was subclinical hypothyroidism (SCH) (28.7%). Up to one-third of the patients, including several neonates with abnormal results, were not referred for further evaluation and were therefore not receiving the necessary treatment. Inter- laboratory biochemical discrepancies and lack of population-specific reference ranges complicated the interpretation of results. The controversy surrounding whether, and how, to treat SCH influenced treatment practices. CONCLUSIONS: Thyroid dysfunction is prevalent in South African children with DS. There is an urgent need to address the laboratory biochemical discrepancies, and to establish guidelines for surveillance and treatment to prevent further irreversible neurological and physical impairment.

Attaining human dignity for people with birth defects: a historical perspective.

People with birth defects have been stigmatised, marginalised and discriminated against for millennia, diminishing their human dignity and abrogating their human rights. Beginning with the United Nations Universal Declaration of Human Rights, promulgated in 1947, the circumstances in which human dignity in healthcare for people with birth defects could be achieved arose, and this was accomplished over the next 65 years through the insight, hard work and dedication of a select group of people and organisations. In 2010 the World Health Organization prioritised services for the care and prevention of birth defects, particularly in middle- and low-income countries. Translating what has been achieved into human rights in healthcare for people with birth defects is the next objective. 

The influence of HIV status on prenatal genetic diagnosis choices.

BACKGROUND: At-risk women of advanced maternal age (AMA) can choose to have second-trimester invasive testing for a prenatal genetic diagnosis on the fetus. Being HIV-positive can complicate the decision-making process. OBJECTIVE: To document HIV status and prenatal genetic diagnosis choices in women of AMA attending genetic clinics in Johannesburg, South Africa, for counselling on the risks of abnormalities in their fetuses. METHODS: Data on the characteristics of the sample, HIV status and prenatal diagnosis decisions were collected retrospectively from the files of 350 women (>34 years) counselled for AMA in genetic clinics in Johannesburg and Pretoria. The time period was 6 months in 2003 and 6 months in 2004. A sample of the women (n=15) who were HIV-positive were interviewed and completed questionnaires on their understanding of their situation. The data were analysed and submitted to statistical testing. RESULTS: Of the 350 women, 183 (52.3%) were HIV-negative, 44 (12.6%) HIV-positive, and 123 (35.1%) of unknown status. Significantly more HIV-negative patients (79/183, 43.2%) than those who were HIV-positive (6/44, 13.6%) had amniocentesis performed for fetal diagnosis. Most of the interviewed women (12/15, 80.0%) understood the severity of HIV infection, 5 (33.3%) considered termination of pregnancy based on the transmission risk, and 4 (26.7%) would have requested amniocentesis and prenatal diagnosis if they had been HIV-negative. CONCLUSION. Decision-making regarding prenatal genetic diagnosis is influenced by HIV status among older women. Effective access to highly active antiretroviral therapy throughout pregnancy would make decision-making easier for these women.

The Greater Sekhukhune-CAPABILITY outreach project.

The Greater Sekhukhune-CAPABILITY Outreach Project was undertaken in a rural district in Limpopo, South Africa, as part of the European Union-funded CAPABILITY programme to investigate approaches for capacity building for the translation of genetic knowledge into care and prevention of congenital disorders. Based on previous experience of a clinical genetic outreach programme in Limpopo, it aimed to initiate a district clinical genetic service in Greater Sekhukhune to gain knowledge and experience to assist in the implementation and development of medical genetic services in South Africa. Implementing the service in Greater Sekhukhune was impeded by a developing staff shortage in the province and pressure on the health service from the existing HIV/AIDS and TB epidemics. This situation underscores the need for health needs assessment for developing services for the care and prevention of congenital disorders in middle- and low-income countries. However, these impediments stimulated the pioneering of innovate ways to offer medical genetic services in these circumstances, including tele-teaching of nurses and doctors, using cellular phones to enhance clinical care and adapting and assessing the clinical utility of a laboratory test, QF-PCR, for use in the local circumstances.

Genetic services and testing in South Africa.

South Africa is a developing middle-income country with a population of over 49 million people. It has a health system, based on national, provincial and private health programmes, which is in transition. There are well organised but small genetic services, based mostly in academic centres, provincial health departments and the National Health Laboratory Service. Trained medical geneticists, genetic counsellors and medical scientists are available to deliver the service. Funding for this service is limited, due partly to the extensive demands made by the rampant HIV/AIDS epidemic (which has lead to a falling life expectancy, and increasing maternal, child and infant mortality rates) and partly due to some ignorance, among both health professionals and the public, concerning the benefits of genetic counselling and testing in affected families. There are four academic human genetics departments across the country providing counselling (7,313 cases were counselled in 2008), testing services (16,073 genetic tests were performed in 2008) and professional training. They also undertake research. Only one tenth of the required staff, according to the WHO recommendations, is available at present to provide these services, and further employment opportunities are urgently required. However, training of professionals continues, comprehensive genetic testing facilities are available, research on many of the genetic conditions of specific concern to the country has been and is being undertaken, and patients from all over Southern and Central Africa make use of these services.

Genetic counseling for fetal abnormalities in a South African community.

Fetal abnormalities are congenital abnormalities identified prenatally. Women who have a fetal abnormality detected often have to make difficult decisions regarding continuation or termination of the pregnancy. The aims of this research project were: to investigate some of the factors that influenced the decision to terminate a pregnancy in which fetal abnormalities were diagnosed; and to determine the implications for genetic counseling practice in South Africa. The study was retrospective and file-based. A total of 171 women counseled for fetal abnormalities, between 2002 and 2006, were identified and relevant data were collected from their records. Altogether 116/170 (68.2%) women were offered termination of pregnancy, and 73/113 (65%) requested the procedure. Early gestation, gestation at the time termination was offered, and ethnicity of the patient, were significantly associated with a termination request. Black patients were less likely to request termination, but more likely to receive a late diagnosis than other patients. Genetic counselors need to adopt an advocacy and educational role to improve this situation. Furthermore, a better understanding of the cultural and ethnicity-related issues is required.

Community genetics. Its definition 2010.

This paper presents a definition of the medical field of community genetics. It starts with a brief historical overview, defines the requirements for an adequate definition, presents the definition, and discusses the constituent parts of the definition.

SLC9A6 mutations cause X-linked mental retardation, microcephaly, epilepsy, and ataxia, a phenotype mimicking Angelman syndrome.

Linkage analysis and DNA sequencing in a family exhibiting an X-linked mental retardation (XLMR) syndrome, characterized by microcephaly, epilepsy, ataxia, and absent speech and resembling Angelman syndrome, identified a deletion in the SLC9A6 gene encoding the Na(+)/H(+) exchanger NHE6. Subsequently, other mutations were found in a male with mental retardation (MR) who had been investigated for Angelman syndrome and in two XLMR families with epilepsy and ataxia, including the family designated as having Christianson syndrome. Therefore, mutations in SLC9A6 cause X-linked mental retardation. Additionally, males with findings suggestive of unexplained Angelman syndrome should be considered as potential candidates for SLC9A6 mutations.

Medical genetics in developing countries.

Since Watson & Crick's 1953 description of the structure of DNA, significant progress has been achieved in the control of congenital disorders, most of which has benefited industrialized countries. Little advantage accrued to developing nations, most of which in the same time frame achieved a significant epidemiological transition, resulting in congenital disorders attaining public health significance. The burden of congenital disorders in these lower-resource countries is high and they need to develop medical genetic services. We present a new pragmatic approach for the care and prevention of congenital disorders in these countries, pioneered initially by the World Health Organization.