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| {{Maturity onset diabetes of the young}} | | {{Maturity onset diabetes of the young}} |
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| {{CMG}} | | {{CMG}} |
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| {{SK}} MODY; | | {{SK}} MODY; |
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| ==Signs, symptoms and differential diagnosis== | | == [[Maturity onset diabetes of the young overview|Overview]] == |
| There are two general types of clinical presentation. Some forms of MODY produce significant [[hyperglycemia]] and the typical signs and symptoms of diabetes: increased thirst and urination (polydipsia and polyuria). In contrast, however, many people with MODY have no signs or symptoms and are diagnosed by either accident, when a high glucose is discovered during testing for other reasons, or screening of relatives of a person discovered to have diabetes. Discovery of mild hyperglycemia during a routine [[glucose tolerance test]] for [[pregnancy]] is particularly characteristic.
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| MODY cases may make up as many as 5% of presumed type 1 and type 2 diabetes cases in a large clinic population. While the goals of diabetes management are the same no matter what type, there are two primary advantages of confirming a diagnosis of MODY. Firstly, insulin may not be necessary and it may be possible to switch a person from insulin injections to oral agents without loss of [[Diabetes management#Glycemic control|glycemic control]]. Secondly, it may prompt screening of relatives and so help identify other cases in family members.
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| As it occurs infrequently, many cases of MODY are initially assumed to be more common forms of diabetes: type 1 if the patient is young and not overweight, type 2 if the patient is overweight, or [[gestational diabetes]] if the patient is pregnant. Standard diabetes treatments (insulin for type 1 and gestational diabetes, and oral hypoglycemic agents for type 2) are often initiated before the doctor suspects a more unusual form of diabetes. In some forms of MODY, standard treatment is appropriate, though exceptions occur. For example, in MODY2, oral agents are relatively ineffective and insulin is unnecessary, while in MODY1 and MODY3, insulin may be more effective than drugs to increase insulin sensitivity. [[Sulfonylurea]]s are effective in the K<sub>ATP</sub> channel forms of neonatal-onset diabetes.
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| The following characteristics suggest the possibility of a diagnosis of MODY in hyperglycemic and diabetic patients:
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| * Mild to moderate hyperglycemia (typically 130-250 mg/dl, or 7-14 mM) discovered before 30 years of age.
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| * A first degree relative with a similar degree of diabetes.
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| * Absence of positive antibodies or other [[autoimmunity]] (e.g., [[thyroiditis]]) in patient and family.
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| * Persistence of a low insulin requirement (e.g., less than 0.5 u/kg/day) past the usual "honeymoon" period.
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| * Absence of obesity (though obese people can get MODY), or other problems associated with type 2 diabetes or [[metabolic syndrome]] (e.g. [[hypertension]], [[hyperlipidemia]], [[polycystic ovary syndrome]]).
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| * Cystic [[kidney]] disease in patient or close relatives.
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| *Non-transient neonatal diabetes, or apparent [[type 1 diabetes mellitus|type 1 diabetes]] with onset before 6 months of age.
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| The diagnosis of MODY is confirmed by specific [[gene]] testing, now available through several commercial [http://www.genetests.org/servlet/access?id=8888892&key=Ocb32xYXEzdQY&fcn=y&fw=iHXb&filename=/ laboratories].
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| ==Pathophysiology==
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| The recognised forms of MODY are all due to ineffective insulin production or release by [[pancreas|pancreatic]] [[beta cell|β-cells]]. Several of the defects are [[mutation]]s of [[transcription factor]] [[gene]]s. One form is due to mutations of the [[glucokinase]] gene. For each form of MODY, multiple specific mutations involving different [[amino acid]] substitutions have been discovered. In some cases, there are significant differences in the activity of the mutant gene product that contribute to variations in the clinical features of the diabetes (such as degree of insulin deficiency or age of onset).
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| Cases of MODY in China appear to be largely unexplained by the genes associated with MODY in Western populations.<ref name="pmid15657605">{{cite journal |author=Xu JY, Dan QH, Chan V, ''et al'' |title=Genetic and clinical characteristics of maturity-onset diabetes of the young in Chinese patients |journal=Eur. J. Hum. Genet. |volume=13 |issue=4 |pages=422–7 |year=2005 |month=April |pmid=15657605 |doi=10.1038/sj.ejhg.5201347}}</ref>
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| ==Genetics==
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| They are inherited in an [[autosomal dominant]] fashion, and most patients therefore have other members of the family with diabetes; [[penetrance]] differs between the types (from 40% to 90%).
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| ===MODY 1: hepatocyte nuclear factor 4α===
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| MODY 1 is due to a loss-of-function mutation in the {{Gene|HNF4A}} gene on [[chromosome 20 (human)|chromosome 20]]. This gene codes for [[hepatocyte nuclear factor 4|HNF4-α]] protein also known as [[transcription factor]] 14 (TCF14). <ref>Stokes, A; and Duda K. Comparison of Fatty Acid Ligands in Human HNF4-α Activity and its Role in Diabetes [Abstract]. Ga. J. Sci. 2005, 63(1), 57.</ref><ref>{{cite journal |author=Duda K, Chi YI, Shoelson SE |title=Structural basis for HNF-4alpha activation by ligand and coactivator binding |journal=J. Biol. Chem. |volume=279 |issue=22 |pages=23311–6 |year=2004 |pmid=14982928 |doi=10.1074/jbc.M400864200}}</ref><ref>{{cite journal |author=Dhe-Paganon S, Duda K, Iwamoto M, Chi YI, Shoelson SE |title=Crystal structure of the HNF4 alpha ligand binding domain in complex with endogenous fatty acid ligand |journal=J. Biol. Chem. |volume=277 |issue=41 |pages=37973–6 |year=2002 |pmid=12193589 |doi=10.1074/jbc.C200420200}}</ref> HNF4α controls function of HNF1α (see MODY 3; {{Gene|TCF1}}) and perhaps HNF1β (MODY 5) as well. This transcription network plays a role in the early development of the pancreas, [[liver]], and [[intestine]]s. In the pancreas these genes influence expression of, among others, the genes for insulin, the principal [[glucose transporter]] ([[GLUT2]]), and several proteins involved in glucose and mitochondrial metabolism.
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| Although pancreatic beta cells produce adequate insulin in infancy, the capacity for insulin production declines thereafter. Diabetes (persistent hyperglycemia) typically develops by early adult years, but may not appear until later decades. The degree of insulin deficiency is slowly progressive. Many patients with MODY 1 are treated with sulfonylureas for years before insulin is required.
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| Liver effects are subtle and not clinically significant. Many people with this condition have low levels of [[triglyceride]]s, [[lipoprotein(a)]], [[apolipoprotein]]s AII and CIII.
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| Mutations in the alternative promoter of HNF4A are linked to development of type 2 diabetes.
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| ===MODY 2: glucokinase===
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| MODY 2 is due to any of several mutations in the ''GCK'' gene on [[chromosome 7 (human)|chromosome 7]] for [[glucokinase]]. Glucokinase serves as the glucose sensor for the beta cell. Normal glucokinase triggers insulin secretion as the glucose exceeds about 90 mg/dl (5 mM). These loss-of-function mutations result in a glucokinase molecule that is less sensitive or less responsive to rising levels of glucose. The beta cells in MODY 2 have a normal ability to make and secrete insulin, but do so only above an abnormally high threshold (e.g., 126-144 mg/dl, or 7-8 mM). This produces chronic, mild hyperglycemia which is usually asymptomatic. It is usually detected by accidental discovery of mild hyperglycemia (e.g., during pregnancy screening). An oral [[glucose tolerance test]] is much less abnormal than would be expected from the [[impaired fasting glucose|impaired (elevated) fasting glucose]], since insulin secretion is usually normal once the glucose has exceeded the threshold for that specific variant of the glucokinase enzyme. It can usually be controlled by dietary measures (primarily avoiding large amounts of carbohydrate). The degree of hyperglycemia does not usually worsen with age and long-term diabetic complications are rare.
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| This type of MODY demonstrates the common circulation but complex interplay between maternal and fetal metabolism and hormone signals in the determination of fetal size. Because MODY2 is an autosomal dominant condition, an affected mother will pass it to 50% of her children. A small number of infants will have a new mutation not present in their mothers. If the mother is affected and the fetus is not, the maternal glucose will be somewhat high and the normal pancreas of the fetus will make lots of insulin, resulting in a large infant. If the fetus is affected but mother is not, glucoses will be normal and fetal insulin production will be low, resulting in [[intrauterine growth retardation]]. Finally, if both mother and fetus have the disease, the two defects will offset each other and fetal size will be unaffected.
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| When both ''GCK'' genes are affected the diabetes appears earlier and the hyperglycemia is more severe. A form of permanent neonatal diabetes has been caused by homozygous mutations in the GCK gene.
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| ===MODY 3: hepatocyte nuclear factor 1α===
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| MODY 3 is caused by mutations of the [[HNF1A|HNF1&alpha]]; gene, a [[homeobox]] gene on [[chromosome 12 (human)|chromosome 12]]. This is the most common type of MODY in populations with European ancestry,<ref name="pmid11272211">{{cite journal |author=Frayling TM, Evans JC, Bulman MP, ''et al'' |title=beta-cell genes and diabetes: molecular and clinical characterization of mutations in transcription factors |journal=Diabetes |volume=50 Suppl 1 |issue= |pages=S94–100 |year=2001 |month=February |pmid=11272211 |doi= |url=http://diabetes.diabetesjournals.org/cgi/pmidlookup?view=long&pmid=11272211}}</ref> accounting for about 70% of all cases in Europe. HNF1α is a transcription factor (also known as transcription factor 1, TCF1) that is thought to control a regulatory network (including, among other genes, HNF1α) important for differentiation of beta cells. Mutations of this gene lead to reduced beta cell mass or impaired function. MODY 1 and MODY 3 diabetes are clinically similar. About 70% of people develop this type of diabetes by age 25 years, but it occurs at much later ages in a few. This type of diabetes can often be treated with sulfonylureas with excellent results for decades. However, the loss of insulin secretory capacity is slowly progressive and most eventually need insulin.
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| This is the form of MODY which can most resemble ordinary type 1 diabetes, and one of the incentives for diagnosing it is that insulin may be discontinued or deferred in favor of oral sulfonylureas. Some people treated with insulin for years due to a presumption of type 1 diabetes have been able to switch to pills and discontinue injections. Long-term diabetic complications can occur if the glucose is not adequately controlled.
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| ===MODY 4: insulin promoter factor-1===
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| MODY 4 arises from mutations of the [[IPF1]] [[homeobox]] gene on [[chromosome 13 (human)|chromosome 13]]. IPF1 is a transcription factor vital to the development of the embryonic pancreas. Even in adults it continues to play a role in the regulation and expression of genes for insulin, GLUT2, glucokinase, and [[somatostatin]].
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| MODY 4 is so rare that only a single family has been well-studied. A child born with pancreatic agenesis (absence of the pancreas) was found to be [[homozygous]] for IPF1 mutations. A number of older relatives who were heterozygous had mild hyperglycemia or diabetes. None were severely insulin-deficient and all were controlled with either diet or oral hypoglycemic agents.
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| ===MODY 5: hepatocyte nuclear factor 1β===
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| HNF1β-related MODY is one of the less common forms of MODY, with some distinctive clinical features, including atrophy of the pancreas and several forms of [[kidney|renal]] disease. HNF1β, also known as transcription factor 2 (TCF2), is involved in early stages of embryonic development of several organs, including the pancreas, where it contributes to differentiation of pancreatic endocrine Ngn3<sup>+</sup> cell progenitors from non-endocrine embryonic duct cells. The gene is on [[chromosome 17 (human)|chromosome 17]].
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| The degree of insulin deficiency is variable. Diabetes can develop from infancy through middle adult life, and some family members who carry the gene remain free of diabetes into later adult life. Most of those who develop diabetes show atrophy of the entire pancreas, with mild or subclincal deficiency of [[pancreas|exocrine]] as well as endocrine function.
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| The non-pancreatic manifestations are even more variable. Kidney and genitourinary [[birth defect|malformation]] and diseases may occur, but inconsistently even within a family, and the specific conditions include a range of apparently unrelated anomalies and processes. The most common genitourinary condition is cystic [[kidney]] disease, but there are many varieties even of this. Renal effects begin with structural alterations (small kidneys, renal cysts, anomalies of the renal pelvis and calices), but a significant number develop slowly progressive [[chronic renal failure|renal failure]] associated with chronic cystic disease of the kidneys. In some cases, renal cysts may be detected in utero. Kidney disease may develop before or after hyperglycemia, and a significant number of people with MODY5 are discovered in renal clinics.
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| With or without kidney disease, some people with forms of HNF1β have had various minor or major anomalies of the reproductive system. Male defects have included [[epididymis|epididymal]] cysts, agenesis of the [[vas deferens]], or [[infertility]] due to abnormal [[spermatozoa]]. Affected women have been found to have vaginal agenesis, hypoplastic, or bicornuate uterus.
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| [[Liver enzyme]] elevations are common, but clinically significant [[liver]] disease is not. [[Hyperuricaemia]] and early onset [[gout]] have occurred. | | == [[Maturity onset diabetes of the young historical perspective|Historical Perspective]] == |
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| ===MODY 6: neurogenic differentiation 1=== | | == [[Maturity onset diabetes of the young classification|Classification]] == |
| MODY 6 arises from mutations of the gene for the transcription factor referred to as neurogenic differentiation 1. The gene is on [[chromosome 2 (human)|chromosome 2]] in a region of the p arm known as IDDM7 because it includes genes affecting susceptibility to type 1 diabetes.<ref name="pmid7704030">{{cite journal |author=Copeman JB, Cucca F, Hearne CM, ''et al'' |title=Linkage disequilibrium mapping of a type 1 diabetes susceptibility gene (IDDM7) to chromosome 2q31-q33 |journal=Nat. Genet. |volume=9 |issue=1 |pages=80–5 |year=1995 |month=January |pmid=7704030 |doi=10.1038/ng0195-80}}</ref> NeuroD1 promotes transcription of the insulin gene as well as some genes involved in formation of beta cells and parts of the nervous system.
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| This is also one of the rarer forms of MODY. Only 3 kindreds with mutations causing MODY6 have been identified so far. In both, some of the members had more typical type 2 diabetes rather than MODY, and the reasons for the difference of expression have not been worked out. Most of the family members with diabetes were diagnosed after age 40, but a few required insulin for [[blood sugar]] control.
| | == [[Maturity onset diabetes of the young pathophysiology|Pathophysiology]] == |
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| ===MODY 7: Kruppel-like factor 11=== | | == [[Maturity onset diabetes of the young causes|Causes]] == |
| [[KLF11]] has been associated with a form of diabetes<ref name="pmid15774581">{{cite journal |author=Neve B, Fernandez-Zapico ME, Ashkenazi-Katalan V, ''et al'' |title=Role of transcription factor KLF11 and its diabetes-associated gene variants in pancreatic beta cell function |journal=Proc. Natl. Acad. Sci. U.S.A. |volume=102 |issue=13 |pages=4807–12 |year=2005 |month=March |pmid=15774581 |pmc=554843 |doi=10.1073/pnas.0409177102 |url=http://www.pnas.org/cgi/pmidlookup?view=long&pmid=15774581}}</ref> that has been characterized as "MODY7" by [[OMIM]].<ref>{{OMIM|610508|MATURITY-ONSET DIABETES OF THE YOUNG, TYPE VII; MODY7}}</ref> | |
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| ===MODY 8: Bile salt dependent lipase=== | | == [[Maturity onset diabetes of the young differential diagnosis|Differentiating Maturity onset diabetes of the young from other Diseases]] == |
| [[Bile salt dependent lipase|CEL]] has been associated with a form of diabetes<ref name="pmid16369531">{{cite journal |author=Raeder H, Johansson S, Holm PI, ''et al'' |title=Mutations in the CEL VNTR cause a syndrome of diabetes and pancreatic exocrine dysfunction |journal=Nat. Genet. |volume=38 |issue=1 |pages=54–62 |year=2006 |month=January |pmid=16369531 |doi=10.1038/ng1708}}</ref> that has been characterized as "MODY8" by [[OMIM]].<ref>{{OMIM|609812|MATURITY-ONSET DIABETES OF THE YOUNG, TYPE VIII, WITH EXOCRINE DYSFUNCTION; MODY8}}</ref> | |
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| ===Permanent neonatal diabetes=== | | == [[Maturity onset diabetes of the young epidemiology and demographics|Epidemiology and Demographics]] == |
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| A newly identified and potentially treatable form of monogenic diabetes is the neonatal diabetes caused by activating mutations of the '''KCNJ11''' gene, which codes for the Kir6.2 subunit of the beta cell K<sub>ATP</sub> channel.<ref>Hattersley A, Gloyn A, Pearson E, Edgehill E, Flanagan S, Ellard S. Novel monogenic diabetes results from activating mutations in Kir6.2 Presented at the First Meeting for the European Group for the Study of Monogenic Diabetes ([http://www.modyinmalaga.net/default.asp?id=1&mnu=1 "MODY in Malaga"]); Malaga, Spain, 21 October 2004. Published form should be available in 2005.</ref> This results in congenital impairment of insulin release but in the past has almost always been thought to be unusually early [[type 1 diabetes|type 1 diabetes mellitus]]. The insulin deficiency results in [[intrauterine growth retardation]] with birth weight small for gestational age. The diabetes is usually diagnosed in the first 3 months of life due to continuing poor weight gain, polyuria, or [[diabetic ketoacidosis]]. Rare cases have been recognized as late as 6 months of age. Remarkably, this type of diabetes often responds well to sulfonylureas and insulin may not be necessary. More severe mutations in the KCNJ11 gene can cause early-onset diabetes which does not respond to the sulfonylurea drugs, as well as a syndrome of developmental delay and neurological features called the DEND syndrome. These forms of diabetes are very rare conditions, appearing in about 1/100,000 to 1/200,000 live births, and accounting for about 1/1000 of type 1 diabetes cases. Fewer than 5% of the cases assumed to exist have been diagnosed, and most diabetes clinics around the world are checking for KCNJ11 mutations in any persons who developed apparent insulin-dependent diabetes without the typical type 1 antibodies before 6 months of age. At least some of these people have been able to change from insulin to sulfonyurea pills after decades of injections.
| | == [[Maturity onset diabetes of the young risk factors|Risk Factors]] == |
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| ===Transient neonatal diabetes=== | | == [[Maturity onset diabetes of the young screening|Screening]] == |
| Not all neonatal-onset diabetes is permanent, and not all forms of either the permanent or transient forms are understood. One of the transient forms appears to be a monogenic condition: that due to the mutations of the other subunit of the K<sub>ATP</sub> channel, SUR1, which is encoded by the [[ABCC8]] gene.<ref name="pmid18497752">{{cite journal |author=de Wet H, Proks P, Lafond M, ''et al'' |title=A mutation (R826W) in nucleotide-binding domain 1 of ABCC8 reduces ATPase activity and causes transient neonatal diabetes |journal=EMBO Rep. |volume= 9|issue= |pages= 648|year=2008 |month=May |pmid=18497752 |doi=10.1038/embor.2008.71}}</ref>
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| ==Management== | | == [[Maturity onset diabetes of the young natural history, complications and prognosis|Natural History, Complications and Prognosis]] == |
| Unfortunately, chronic hyperglycemia of any cause can eventually cause blood vessel damage and the microvascular complications of diabetes. The principal treatment goals for people with MODY — keeping the blood sugars as close to normal as possible ("good [[Diabetes management#Glycemic control|glycemic control]]"), while minimizing other vascular risk factors — are the same for all known forms of diabetes.
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| Tools available for management are also those available for all forms of diabetes: blood testing, changes in [[diet (nutrition)|diet]], physical [[exercise]], oral hypoglycemic agents, and insulin injections. In many cases these goals can be achieved more easily with MODY than with ordinary types 1 and 2 diabetes. Some people with MODY may require insulin injections to achieve the same [[Diabetes management#Glycemic control|glycemic control]] that another person may attain with careful eating or an oral medication.
| | == Diagnosis == |
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| When oral hypoglycemic agents are used in MODY, the sulfonylureas remain the oral medication of first resort. Patients with MODY less often suffer from obesity and [[insulin resistance]] than those with ordinary type 2 diabetes (for whom insulin sensitizers like [[metformin]] or the [[thiazolidinedione]]s are often preferred over the sulfonylureas).
| | [[Maturity onset diabetes of the young history and symptoms|History and Symptoms]] | [[Maturity onset diabetes of the young physical examination|Physical Examination]] | [[Maturity onset diabetes of the young laboratory tests|Laboratory Findings]] | [[Maturity onset diabetes of the young CT|CT]] | [[Maturity onset diabetes of the young MRI|MRI]] | [[Maturity onset diabetes of the young echocardiography or ultrasound|Echocardiography or Ultrasound]] | [[Maturity onset diabetes of the young other imaging findings|Other Imaging Findings]] | [[Maturity onset diabetes of the young other diagnostic studies|Other Diagnostic Studies]] |
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| ==Related homozygous disorders== | | == Treatment == |
| By definition, the forms of MODY are autosomal dominant, requiring only one abnormal gene to produce the disease; the severity of the disease is moderated by the presence of a second, normal allele which presumably functions normally. However, a small number of people carrying two abnormal alleles have been identified. Unsurprisingly, combined (homozygous) defects of these genes are both much rarer and much more severe in their effects.
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| *Homozygous glucokinase deficiency causes severe congenital insulin deficiency resulting in persistent neonatal diabetes mellitus. About 6 cases have been reported worldwide. All have required insulin treatment from shortly after birth. The condition does not seem to improve with age.
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| *Homozygous IPF1 results in failure of the pancreas to form. Congenital absence of the pancreas, termed pancreatic agenesis, involves deficiency of both endocrine and exocrine functions of the pancreas.
| | [[Maturity onset diabetes of the young medical therapy|Medical Therapy]] | [[Maturity onset diabetes of the young surgery|Surgery]] | [[Maturity onset diabetes of the young primary prevention|Primary Prevention]] | [[Maturity onset diabetes of the young secondary prevention|Secondary Prevention]] | [[Maturity onset diabetes of the young cost-effectiveness of therapy|Cost-Effectiveness of Therapy]] | [[Maturity onset diabetes of the young future or investigational therapies|Future or Investigational Therapies]] |
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| Homozygous HNF4α, HNF1α, HNF1β, and NeuroD1 mutations have not yet been described. Those mutations for which a homozygous form has not been described may be extremely rare, or may result in clinical problems not yet recognized as connected to the monogenic disorder, or may be lethal for a fetus and not result in a viable child.
| | == Case Studies == |
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| ==References==
| | [[Maturity onset diabetes of the young case study one|Case #1]] |
| {{reflist|2}}
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| ==Further reading== | | == External links == |
| * {{cite journal |author=Fajans SS |title=Scope and heterogeneous nature of MODY |journal=Diabetes Care |volume=13 |issue=1 |pages=49–64 |year=1990 |pmid=2404717 |doi=10.2337/diacare.13.1.49}} (''For historical perspective, this review covers the concept just before the nature of the first of the specific molecular defects was discovered. It illustrates the significant change in the disease(s) referred to as MODY before and after 1990.'')
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| * {{cite journal |author=Fajans SS, Bell GI, Polonsky KS |title=Molecular mechanisms and clinical pathophysiology of maturity-onset diabetes of the young |journal=N. Engl. J. Med. |volume=345 |issue=13 |pages=971–80 |year=2001 |pmid=11575290 |doi=10.1056/NEJMra002168|url=http://content.nejm.org/cgi/content/extract/345/13/971?view=extractpmid=11575290}} (''An excellent overview of the modern concept of the 6 types of MODY.'')
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| *[http://www.ncbi.nlm.nih.gov/books/bv.fcgi?call=bv.View..ShowTOC&rid=diabetes.TOC Dean L and McEntyre J, 2004.] '''The Genetic Landscape of Diabetes'''. Bethesda:NCBI, 2004. ''This is an entire online textbook on the complex genetics of the forms of diabetes. The chapter on MODY provides an up-to-date and concise overview of the molecular defects. Little expansion of clinical knowledge of the 6 types since 2001 has occurred.''
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| ==External links==
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| * [http://www.diabetesgenes.org Andrew Hattersley's Exeter and Oxford research groups] | | * [http://www.diabetesgenes.org Andrew Hattersley's Exeter and Oxford research groups] |
| * [http://www.athenadiagnostics.com/MODY Virtual Grand Rounds: "MODY" by William E. Winter]
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