Please login with your free MJA account to view this article in full
Please note: institutional and Research4Life access to the MJA is now provided through Wiley Online Library.
- 1 University of Adelaide, Adelaide, SA
- 2 Royal Adelaide Hospital, Adelaide, SA
- 3 University of Western Australia, Perth, WA
- 4 Fiona Stanley and Fremantle Hospitals, Perth, WA
- 5 Mater Pathology, Brisbane, QLD
- 6 Auckland City Hospital, Auckland, New Zealand
- 7 Clinical Genomics, St Vincent’s Health Australia Ltd, Sydney, NSW
- 8 University of New South Wales, Sydney, NSW
- 9 University of Notre Dame, Sydney, NSW
- 10 University of Sydney, Sydney, NSW
- 11 Waikato Regional Diabetes Service, Te Whatu Ora Health New Zealand Waikato, Hamilton, New Zealand
- 12 University of Waikato, Hamilton, New Zealand
- 13 Genetic Health Service New Zealand, Auckland City Hospital, Auckland, New Zealand
- 14 Austin Health, Melbourne, VIC
- 15 University of Melbourne, Melbourne, VIC
- 16 Australian Centre for Accelerating Diabetes Innovations, Melbourne, VIC
- 17 Barts Health NHS Foundation Trust, London, United Kingdom
- 18 University of Auckland, Auckland, New Zealand
- 19 Auckland Diabetes Centre, Health New Zealand Te Whatu Ora, Auckland, New Zealand
- 20 Specialist Weight Management Service, Health New Zealand Te Whatu Ora, Auckland, New Zealand
- 21 St Vincent’s Hospital, Sydney, NSW
- 22 Garvan Institute of Medical Research, Sydney, NSW
Open access:
Open access publishing facilitated by The University of Adelaide, as part of the Wiley – The University of Adelaide agreement via the Council of Australian University Librarians.
Sunita De Sousa is supported by the Royal Adelaide Hospital Mary Overton Early Career Research Fellowship.
The authors of this article are members of the societies that have produced this joint society consensus statement: Australian Diabetes Society (ADS; Aleena Ali, Timothy Davis, Sunita De Sousa, Elif Ekinci, Jerry Greenfield), Endocrine Society of Australia (ESA; Sunita De Sousa, Elif Ekinci, Jerry Greenfield, Ryan Paul), Human Genetics Society of Australasia (HGSA; Sunita De Sousa, Mark Greenslade, James Harraway, Juliet Taylor, Kathy Wu), New Zealand Society for the Study of Diabetes (NZSSD; Rinki Murphy, Ryan Paul), Royal College of Pathologists of Australasia (RCPA; James Harraway) and Royal College of Pathologists, UK (RCPath UK; Mark Greenslade). The following authors received honoraria/conference support: Timothy Davis (Novo Nordisk, BI, Merck, Mylan, sanofi‐aventis, Eli Lilly), Sunita De Sousa (Pfizer), Elif Ekinci (Boehringer, Novo Nordisk), Jerry Greenfield (Lilly, Novartis), Rinki Murphy (Eli Lilly, Boehringer Ingelheim, Novo Nordisk), Ryan Paul (Dexcom, Novo Nordisk, Eli Lilly, Boehringer Ingelheim, Radiant Health). The following authors have advisory board memberships: Timothy Davis (Novo Nordisk, Merck), Sunita De Sousa (Novo Nordisk), Elif Ekinci (Eli Lilly, Sanofi), Ryan Paul (Dexcom, Abbot, Novo Nordisk), Kathy Wu (23 Strands). The following authors have received research support: Elif Ekinci (Medtronic, Novo Nordisk, Eli Lilly, Boehringer, Versanis, Endogenex), Ryan Paul (Dexcom).
Author contribution statement:
All authors contributed to the conceptualization, methodology, analysis and writing (original draft, review and editing) of the manuscript.
- 1. Murphy R, Colclough K, Pollin TI, et al. The use of precision diagnostics for monogenic diabetes: a systematic review and expert opinion. Commun Med (Lond) 2023; 3: 136.
- 2. Shields BM, McDonald TJ, Ellard S, et al. The development and validation of a clinical prediction model to determine the probability of MODY in patients with young‐onset diabetes. Diabetologia 2012; 55: 1265‐1272.
- 3. Guyatt GH, Oxman AD, Vist GE, et al. GRADE: an emerging consensus on rating quality of evidence and strength of recommendations. BMJ 2008; 336: 924‐926.
- 4. Swiglo BA, Murad MH, Schünemann HJ, et al. A case for clarity, consistency, and helpfulness: state‐of‐the‐art clinical practice guidelines in endocrinology using the grading of recommendations, assessment, development, and evaluation system. J Clin Endocrinol Metab 2008; 93: 666‐673.
- 5. Petersenn S, Fleseriu M, Casanueva FF, et al. Diagnosis and management of prolactin‐secreting pituitary adenomas: a Pituitary Society International Consensus Statement. Nat Rev Endocrinol 2023; 19: 722‐740.
- 6. Bishay RH, Greenfield JR. A review of maturity onset diabetes of the young (MODY) and challenges in the management of glucokinase‐MODY. Med J Aust 2016; 205: 480‐485. https://www.mja.com.au/journal/2016/205/10/review‐maturity‐onset‐diabetes‐young‐mody‐and‐challenges‐management‐glucokinase
- 7. Colclough K, Ellard S, Hattersley A, Patel K. Syndromic monogenic diabetes genes should be tested in patients with a clinical suspicion of maturity‐onset diabetes of the young. Diabetes 2022; 71: 530‐537.
- 8. Ali AS, Wong JC, Campbell A, Ekinci EI. Testing for monogenic diabetes is lower than required to reveal its true prevalence in an Australian population. Diabet Epidemiol Manag 2022; 6: 100069.
- 9. Harrington F, Greenslade M, Colclough K, et al. Monogenic diabetes in New Zealand ‐ An audit based revision of the monogenic diabetes genetic testing pathway in New Zealand. Front Endocrinol (Lausanne) 2023; 14: 1116880.
- 10. Stark Z, Dolman L, Manolio TA, et al. Integrating genomics into healthcare: a global responsibility. Am J Hum Genet 2019; 104: 13‐20.
- 11. Greeley SAW, Polak M, Njølstad PR, et al. ISPAD Clinical Practice Consensus Guidelines 2022: The diagnosis and management of monogenic diabetes in children and adolescents. Pediatr Diabetes 2022; 23: 1188‐1211.
- 12. Gjesing AP, Rui G, Lauenborg J, et al. High prevalence of diabetes‐predisposing variants in MODY genes among Danish women with gestational diabetes mellitus. J Endocr Soc 2017; 1: 681‐690.
- 13. Faguer S, Chassaing N, Bandin F, et al. The HNF1B score is a simple tool to select patients for HNF1B gene analysis. Kidney Int 2014; 86: 1007‐1015.
- 14. Holmes‐Walker DJ, Boyages SC. Prevalence of maternally inherited diabetes and deafness in Australian diabetic subjects. Diabetologia 1999; 42: 1028‐1029.
- 15. Ali AS, Ekinci EI, Pyrlis F. Maternally inherited diabetes and deafness (MIDD): an uncommon but important cause of diabetes. Endocr Metab Sci 2021; 2: 100074.
- 16. Carroll RW, Murphy R. Monogenic diabetes: a diagnostic algorithm for clinicians. Genes (Basel) 2013; 4: 522‐535.
- 17. De Sousa SMC, Wu KHC, Colclough K, et al. Identification of monogenic diabetes in an Australian cohort using the Exeter maturity‐onset diabetes of the young (MODY) probability calculator and next‐generation sequencing gene panel testing. Acta Diabetol 2024; 61: 181‐188.
- 18. Toomata Z, Leask M, Krishnan M, et al. Genetic testing for misclassified monogenic diabetes in Māori and Pacific peoples in Aōtearoa New Zealand with early‐onset type 2 diabetes. Front Endocrinol (Lausanne) 2023; 14: 1174699.
- 19. McEwen A, Jacobs C. Who we are, what we do, and how we add value: The role of the genetic counseling ‘philosophy of practice’ statement in a changing time. J Genet Couns 2021; 30: 114‐120.
- 20. MinterEllison. Government bans use of genetic test results in life insurance. Sept 2024. https://www.minterellison.com/articles/government‐bans‐use‐of‐genetic‐test‐results‐in‐life‐insurance#:~:text=On%2011%20September%202024%2C%20the,results%20in%20life%20insurance%20underwriting (viewed Feb 2025).
- 21. Otlowski MF, Williamson R. Ethical and legal issues and the “new genetics”. Med J Aust 2003; 178: 582‐585. https://www.mja.com.au/journal/2003/178/11/ethical‐and‐legal‐issues‐and‐new‐genetics
- 22. Cormack M, Irving KB, Cunningham F, Fennell AP. Mainstreaming genomic testing: pre‐test counselling and informed consent. Med J Aust 2024; 220: 403‐406. https://www.mja.com.au/journal/2024/220/8/mainstreaming‐genomic‐testing‐pre‐test‐counselling‐and‐informed‐consent
- 23. Pitini E, Baccolini V, Migliara G, et al. Time to align: a call for consensus on the assessment of genetic testing. Front Public Health 2021; 9: 807695.
- 24. Bean LJH, Funke B, Carlston CM, et al. Diagnostic gene sequencing panels: from design to report‐a technical standard of the American College of Medical Genetics and Genomics (ACMG). Genet Med 2020; 22: 453‐461.
- 25. SoRelle JA, Funke BH, Eno CC, et al. Slice testing‐considerations from ordering to reporting: a joint report of the Association for Molecular Pathology, College of American Pathologists, and National Society of Genetic Counselors. J Mol Diagn 2024; 26: 159‐167.
- 26. Berberich AJ, Wang J, Cao H, et al. Simplifying detection of copy‐number variations in maturity‐onset diabetes of the young. Can J Diabetes 2021; 45: 71‐77.
- 27. McGlaughon JL, Goldstein JL, Thaxton C, et al. The progression of the ClinGen gene clinical validity classification over time. Hum Mutat 2018; 39: 1494‐1504.
- 28. Thaxton C, Good ME, DiStefano MT, et al. Utilizing ClinGen gene‐disease validity and dosage sensitivity curations to inform variant classification. Hum Mutat 2022; 43: 1031‐1040.
- 29. Martin AR, Williams E, Foulger RE, et al. PanelApp crowdsources expert knowledge to establish consensus diagnostic gene panels. Nat Genet 2019; 51: 1560‐1565.
- 30. Saint‐Martin C, Bouvet D, Bastide M, Bellanné‐Chantelot C. Gene panel sequencing of patients with monogenic diabetes brings to light genes typically associated with syndromic presentations. Diabetes 2022; 71: 578‐584.
- 31. Naylor RN, Patel KA, Kettunen JLT, et al. Systematic review of treatment of beta‐cell monogenic diabetes [preprint]. medRxiv 2023 Sep 22:2023.05.12.23289807; 2023. (viewed Feb 2025).
- 32. Delvecchio M, Pastore C, Giordano P. Treatment options for MODY patients: a systematic review of literature. Diabetes Ther 2020; 11: 1667‐1685.
- 33. Steele AM, Shields BM, Wensley KJ, et al. Prevalence of vascular complications among patients with glucokinase mutations and prolonged, mild hyperglycemia. JAMA 2014; 311: 279‐286.
- 34. Steele AM, Shields BM, Shepherd M, et al. Increased all‐cause and cardiovascular mortality in monogenic diabetes as a result of mutations in the HNF1A gene. Diabet Med 2010; 27: 157‐161.
- 35. Mateus JC, Rivera C, O’Meara M, et al. Maturity‐onset diabetes of the young type 5 a MULTISYSTEMIC disease: a CASE report of a novel mutation in the HNF1B gene and literature review. Clin Diabetes Endocrinol 2020; 6: 16.
- 36. Guillausseau PJ, Dubois‐Laforgue D, Massin P, et al. Heterogeneity of diabetes phenotype in patients with 3243 bp mutation of mitochondrial DNA (Maternally Inherited Diabetes and Deafness or MIDD). Diabetes Metab 2004; 30: 181‐186.
- 37. Human Genetics Society of Australia. HGSA Position Statement: Predictive and Pre‐symptomatic Genetic Testing in Adults and Children. HGSA, Dec 2023. https://hgsa.org.au/common/Uploaded%20files/pdfs/policies,%20position%20statements%20and%20guidelines/eesic/Predictive%20testing%20in%20Audlts%20and%20Children.pdf (viewed June 2025).
- 38. Liljeström B, Aktan‐Collan K, Isomaa B, et al. Genetic testing for maturity onset diabetes of the young: uptake, attitudes and comparison with hereditary non‐polyposis colorectal cancer. Diabetologia 2005; 48: 242‐250.
- 39. Richards S, Aziz N, Bale S, et al. Standards and guidelines for the interpretation of sequence variants: a joint consensus recommendation of the American College of Medical Genetics and Genomics and the Association for Molecular Pathology. Genet Med 2015; 17: 405‐423.
- 40. De Sousa SMC, Phan JMN, Wells A, et al. Improving detection of monogenic diabetes through reanalysis of GCK variants of uncertain significance. Acta Diabetol 2025.
- 41. Rudland VL. Diagnosis and management of glucokinase monogenic diabetes in pregnancy: current perspectives. Diabetes Metab Syndr Obes 2019; 12: 1081‐1089.
- 42. Murphy R, Turnbull DM, Walker M, Hattersley AT. Clinical features, diagnosis and management of maternally inherited diabetes and deafness (MIDD) associated with the 3243A>G mitochondrial point mutation. Diabet Med 2008; 25: 383‐399.
- 43. Timsit J, Ciangura C, Dubois‐Laforgue D, et al. Pregnancy in women with monogenic diabetes due to pathogenic variants of the glucokinase gene: lessons and challenges. Front Endocrinol (Lausanne) 2022; 12: 802423.
- 44. Chakera AJ, Hurst PS, Spyer G, et al. Molecular reductions in glucokinase activity increase counter‐regulatory responses to hypoglycemia in mice and humans with diabetes. Mol Metab 2018; 17: 17‐27.
- 45. Kirzhner A, Barak O, Vaisbuch E, et al. The challenges of treating glucokinase MODY during pregnancy: a review of maternal and fetal outcomes. Int J Environ Res Public Health 2022; 19: 5980.
- 46. Hughes AE, Houghton JAL, Bunce B, et al. Bringing precision medicine to the management of pregnancy in women with glucokinase‐MODY: a study of diagnostic accuracy and feasibility of non‐invasive prenatal testing. Diabetologia 2023; 66: 1997‐2006.
- 47. Hardy T. The role of prenatal diagnosis following preimplantation genetic testing for single‐gene conditions: a historical overview of evolving technologies and clinical practice. Prenat Diagn 2020; 40: 647‐651.
- 48. Smeets HJM, Sallevelt S, Herbert M. Reproductive options in mitochondrial disease. Handb Clin Neurol 2023; 194: 207‐228.


Abstract
Introduction: Monogenic diabetes accounts for 2–5% of diabetes. Although its identification has substantial therapeutic implications, more than 80% of affected individuals are undiagnosed or misdiagnosed as having type 1 or 2 diabetes. This consensus statement reviews genetic testing for monogenic diabetes in adults and provides evidence‐based recommendations. With representation from the Australian Diabetes Society (ADS), Endocrine Society of Australia (ESA), Human Genetics Society of Australasia (HGSA), New Zealand Society for the Study of Diabetes (NZSSD) and Royal College of Pathologists of Australasia (RCPA), the writing group: (i) defined questions to be addressed, (ii) conducted critical literature reviews, (iii) graded the evidence, and (iv) generated recommendations that were refined until consensus was achieved. All contemporary literature was considered, with a focus on Australian and New Zealand data, where available.
Main recommendations: Indications for genetic testing for monogenic diabetes in adults include: (i) diabetes onset before 12 months of age, (ii) glucokinase (GCK )‐hyperglycaemia phenotype, (iii) diabetes onset before 30 years of age without markers of type 1 or 2 diabetes, (iv) syndromic monogenic diabetes phenotype, or (v) high probability of monogenic diabetes using validated screening tools. Individuals undergoing genetic testing should be provided with comprehensive pre‐ and post‐test counselling. Genetic testing typically involves next‐generation sequencing, and should include classically syndromic genetic variants (eg, m.3243A>G, HNF1B variants) even in individuals with isolated diabetes. A molecular diagnosis facilitates gene‐specific treatment, surveillance, reproductive planning and cascade testing of relatives. In pregnancies of individuals with GCK ‐hyperglycaemia, maternal treatment can be individualised to known or assumed fetal genotype. Individuals with monogenic diabetes variants of uncertain significance or negative results may be considered for further phenotype or genotype assessment and recruitment into research studies.
Changes in management: This consensus statement aims to raise awareness of monogenic diabetes among clinicians involved in the care of patients with diabetes, and to improve genetic testing rates across Australia and New Zealand.