Myotonic Dystrophy CTG Repeat Size and Phenotype Predictor

Predict myotonic dystrophy type 1 (DM1) phenotypic class (congenital, childhood, adult, late-onset) and anticipation risk from parental CTG repeat size, anticipation in maternal vs paternal transmission, and degree of somatic mosaicism.

Weight
Height
Clinical Guidance

BMI is a screening measure of body size, not a direct measure of body fat. The standard WHO categories are underweight (<18.5), normal (18.5–24.9), overweight (25–29.9), and obese (≥30).

BMI can overestimate body fat in athletes with high muscle mass and underestimate it in older adults with low muscle mass. Interpret it alongside waist circumference and clinical context rather than as a standalone diagnosis.

⚕ Clinical Disclaimer: These calculators are for educational and reference purposes only. Always verify results with qualified clinical judgment and current clinical guidelines. Do not use as a sole basis for medical decisions.
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How It Works

Predict myotonic dystrophy type 1 (DM1) phenotypic class (congenital, childhood, adult, late-onset) and anticipation risk from parental CTG repeat size, anticipation in maternal vs paternal transmission, and degree of somatic mosaicism

Each component has a specific meaning:

  • Parental CTG repeat size — The parental ctg repeat size recorded for the scenario being assessed.
  • Anticipation in maternal vs paternal transmission — The anticipation in maternal vs paternal transmission recorded for the scenario being assessed.
  • Degree of somatic mosaicism — The degree of somatic mosaicism recorded for the scenario being assessed.

Note: Interpret the dm1 ctg phenotype result against the thresholds and context described above.

How to Use

Enter the parental CTG repeat size, anticipation in maternal vs paternal transmission, degree of somatic mosaicism for the scenario you are assessing. Predict myotonic dystrophy type 1 (DM1) phenotypic class (congenital, childhood, adult, late-onset) and anticipation risk from parental CTG repeat size, anticipation in maternal vs paternal transmission, and degree of somatic mosaicism. Use the dm1 ctg phenotype result to inform your calculation.

Frequently Asked Questions