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Mitochondrial Diabetes (MIDD)

Maternally Inherited Diabetes and Deafness

Written by: Saygı Hospital Health Guide Editorial Board
Last updated:

This content has been compiled by the Saygı Hospital Health Guide Editorial Board and is periodically reviewed by a specialist physician.

References (5)

This content is for informational purposes only and does not constitute medical advice. You can book an appointment at our Endokrinoloji department. Book Appointment →

What is Mitochondrial Diabetes (MIDD)?

Maternally inherited diabetes and deafness (MIDD) accounts for approximately 0.5-2.8% of diabetes cases.

Most commonly caused by m.3243A>G point mutation in MT-TL1 (mitochondrial tRNA leucine 1) gene.

Heteroplasmy (proportion of mutant mtDNA) determines clinical severity and tissue involvement.

Pathogenesis: defective oxidative phosphorylation, impaired beta-cell glucose sensing, and progressive beta-cell dysfunction.

Same mutation can cause MELAS syndrome (mitochondrial encephalopathy, lactic acidosis, stroke-like episodes) at higher heteroplasmy levels.

Maternal inheritance pattern: only mothers transmit; both sexes affected but only daughters pass on.

Symptoms

Progressive bilateral sensorineural hearing loss (often precedes diabetes by years, 75% of patients).
Diabetes onset typically between ages 30-40 (range 11-68), often non-obese phenotype.
Macular pattern dystrophy (pigmentary retinopathy without functional impact in early stages).
Short stature and low BMI (impaired anabolism).
Hypertrophic or dilated cardiomyopathy (40-50%).
Renal disease (FSGS, tubulointerstitial nephritis) without significant proteinuria.
Myopathy (proximal muscle weakness, exercise intolerance).
Lactic acidosis after exercise or stress; stroke-like episodes if MELAS overlap.
Gastrointestinal dysmotility (gastroparesis, intestinal pseudo-obstruction).

Risk Factors

Maternal family history of diabetes + hearing loss (clue to maternal inheritance).
Onset before age 45 with hearing loss.
Non-obese phenotype with diabetes.
Family members with MELAS-like episodes or other mitochondrial diseases.
Negative pancreatic autoantibodies.

When to See a Doctor?

If you experience any of the following symptoms, seek medical attention promptly:

  • Diabetes diagnosis with bilateral sensorineural hearing loss.
  • Maternal family history of diabetes plus deafness.
  • Diabetes onset under age 40 with cardiomyopathy or short stature.
  • Episodes of lactic acidosis or stroke-like episodes.
  • Macular pigmentary changes on fundoscopy.
  • Genetic counseling referral for at-risk maternal relatives.

Treatment Methods

01
Genetic confirmation by mtDNA m.3243A>G testing (heteroplasmy quantification in blood/urine).
02
Diet, exercise, and lifestyle modifications (avoid metformin due to lactic acidosis risk).
03
Sulfonylureas, DPP-4 inhibitors, and GLP-1 receptor agonists are preferred oral agents.
04
Insulin therapy in advanced disease (most patients require insulin within 5-10 years).
05
Coenzyme Q10, L-carnitine, and B-vitamins as supportive mitochondrial cocktail (limited evidence).
06
Avoid mitochondrial toxins: aminoglycosides (deafness), valproate (hepatotoxicity), statins.
07
Multidisciplinary care: endocrinology, audiology, cardiology, ophthalmology, neurology, nephrology.
08
Annual screening for hearing, retinal, cardiac (echocardiography), and renal complications.
09
Genetic counseling for maternal relatives; preimplantation genetic diagnosis for women planning pregnancy.

Which Department to Visit?

You can visit our Endokrinoloji department for these complaints. Our specialist physicians will create the most suitable treatment plan for you.

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Health Disclaimer: The information on this page is prepared for general informational purposes only. It does not replace medical diagnosis and treatment. Please consult your physician for your complaints. Saygı Hospital does not accept responsibility for actions taken based on the information on this page.