16p13.11 microdeletion uncovers loss‐of‐function of a MYH11 missense variant in a patient with megacystis‐microcolon‐intestinal‐hypoperistalsis syndrome

Megacystis-microcolon-intestinal hypoperistalsis syndrome (MMIHS), a rare condition that affects smooth muscle cells, is caused by biallelic null alleles in MYH11. We report on a girl with MMIHS in addition to growth hormone deficiency, central hypothyroidism and a tonically dilated pupil with accommodation deficit. Sanger sequencing and arrayCGH uncovered the novel heterozygous missense variant c.379C>T in MYH11 and a heterozygous 1.3 Mb...