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Human cardiac myosin light chain 4 (MYL4) mosaic expression patterns vary by sex.


ABSTRACT: Sex disparities modulate cardiac function, although the proteins and mechanisms remain to be elucidated. We recently demonstrated a mosaic pattern of protein expression in the heart for over 100 proteins. Here we investigate one of these proteins, myosin light chain 4 (MYL4), which is important for contractile functions by increasing force production. We assayed the expression pattern of MYL4 across 756 ventricular myocardial samples from 668 individuals utilizing a semi-automated Cell Profiler method on five tissue microarrays (TMAs) of cardiac tissues across a diverse set of diseases. The percentage of MYL4 positive cells was significantly higher in male subjects independently across all five TMAs, regardless of disease state (p?=?8.66e-15). Higher MYL4 expression was also modestly associated with hypertrophic cardiomyopathy (p?=?6.3e-04). MYL4 expression did not associate with sudden cardiac death or other cardiomyopathies. This study demonstrates a new mosaic pattern of protein expression that underlies sex disparities in the human heart.

SUBMITTER: Wang TY 

PROVIDER: S-EPMC6722118 | biostudies-literature | 2019 Sep

REPOSITORIES: biostudies-literature

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Human cardiac myosin light chain 4 (MYL4) mosaic expression patterns vary by sex.

Wang Tony Y TY   Arking Dan E DE   Maleszewski Joseph J JJ   Fox-Talbot Karen K   Nieuwenhuis Tim O TO   Santhanam Lakshmi L   Virmani Renu R   Rosenberg Avi Z AZ   Halushka Marc K MK  

Scientific reports 20190903 1


Sex disparities modulate cardiac function, although the proteins and mechanisms remain to be elucidated. We recently demonstrated a mosaic pattern of protein expression in the heart for over 100 proteins. Here we investigate one of these proteins, myosin light chain 4 (MYL4), which is important for contractile functions by increasing force production. We assayed the expression pattern of MYL4 across 756 ventricular myocardial samples from 668 individuals utilizing a semi-automated Cell Profiler  ...[more]

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