# Development of MRI, Alternative Splicing, and Functional Abilities asBiomarkers in Myotonic Dystrophy Type 1

> **NIH NIH R01** · UNIVERSITY OF FLORIDA · 2021 · $195,176

## Abstract

Project Summary/Abstract
Myotonic Dystrophy Type 1 (DM1) is the most common form of muscular dystrophy in adults. It is caused by an
unstable triple repeat of the myotonic dystrophy protein kinase (DMPK) gene. These repeats create retention of
mutant mRNA in the nuclear foci causing alternative splicing abnormalities in many other genes and resultant
multi-systemic pathology. The pathological muscular changes from DM1 cause progressive weakness,
myotonia, gait impairments, decreased balance, increased fall risk, disability, and a shortened life span. Much
progress has been made through preclinical studies to identify potential therapeutic targets to address the
pathophysiology of DM1. However, the lack of sensitive, objective biomarkers is one of the largest obstacles in
moving ahead with clinical trials. There is a dire need for repeatable and clinically relevant outcome measures
to be developed so future studies can investigate new therapeutics. Both MRI and alternative splicing have been
explored as biomarkers to assess skeletal muscle and disease pathology in DM1. While the initial results from
preliminary studies have been promising, far greater detailed work remains to be completed in order to determine
how these measures can be optimally used as clinically meaningful biomarkers for DM1 in support of the
development of new therapies. Thus, the overall objective of this study is to validate quantitative MRI (qMRI) and
alternative splicing as biomarkers in DM1. In Aim 1, 30 subjects with DM1 will be assessed with qMRI (from the
upper and lower extremity musculature) and functional tests at baseline and at 18 months. The results will
provide quantitative information about muscle pathology change over time and the clinical utility of qMRI. For
Aim 2, these same 30 DM1 participants will have an MRI-Informed biopsy from which RNA will be isolated to
quantitate splicing events. We will assess how alternative splicing is related to both qMRI and functional tests.
Aim 3 will add alternative splicing data collection and analyses after 18 months to examine change over time in
these events. We anticipate the results from this study will provide novel and vital information regarding the
longitudinal changes in qMRI and alternative splicing as well as the relationships between qMRI, alternative
splicing, and clinical assessments. This information will be key to the future use of these outcomes as biomarkers
in future clinical trials for patients with DM1.

## Key facts

- **NIH application ID:** 10240487
- **Project number:** 5R01AR076060-02
- **Recipient organization:** UNIVERSITY OF FLORIDA
- **Principal Investigator:** Donovan J Lott
- **Activity code:** R01 (R01, R21, SBIR, etc.)
- **Funding institute:** NIH
- **Fiscal year:** 2021
- **Award amount:** $195,176
- **Award type:** 5
- **Project period:** 2020-08-17 → 2023-06-30

## Primary source

NIH RePORTER: https://reporter.nih.gov/project-details/10240487

## Citation

> US National Institutes of Health, RePORTER application 10240487, Development of MRI, Alternative Splicing, and Functional Abilities asBiomarkers in Myotonic Dystrophy Type 1 (5R01AR076060-02). Retrieved via AI Analytics 2026-05-24 from https://api.ai-analytics.org/grant/nih/10240487. Licensed CC0.

---

*[NIH grants dataset](/datasets/nih-grants) · CC0 1.0*