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. 2020 Aug 5;22(12):2041–2051. doi: 10.1038/s41436-020-0915-1

Fig. 3. Analysis of the different DYNC2H1 transcripts of proband 1.

Fig. 3

Sanger sequencing (a), Agena MassARRAY experiments (b), and in vitro microtubule gliding assays (cf) show that proband 1 variably expresses three DYNC2H1 transcripts with impaired in vitro microtubule gliding. Variants are numbered according to the DYNC2H1 transcript NM_001080463.1. (a) The top right electropherogram shows that transcript 1 is expressed even though V1 (orange) causes a frameshift and premature termination codon (PTC) in exon 88 (brown). Top left and bottom electropherograms show that V2 (red) causes incomplete in-frame exon skipping of exon 41 (blue), resulting in the expression of transcript 2a with V2 and transcript 2b missing exon 41. Exon 40: pink. Exon 42: green. Rest of the DYNC2H1 exons and introns: black dashed lines. Location of transcript-specific identifier nucleotides used for Agena MassARRAY experiments: roman numerals. (b) MassARRAY shows product peaks for identifier nucleotides I–IV and shows that 2b is the dominant transcript. Allelotype frequency = (peak allele 1 – peak area variance allele 1) / (peak allele 1 – area variance allele 1) + (peak allele 2 – area variance allele 2). (c) Sodium dodecyl sulfate–polyacrylamide gel electrophoresis (SDS-PAGE) of purified wild type (WT), V2, and V1 dynein-2 motor domains. (d) Fluorescently labeled (Alexa-488) microtubules (MTs) are added and translocated by dynein in the presence of adenosine triphosphate (ATP). The movement is monitored using total internal reflection fluorescence (TIRF) microscopy. Time sequence of microtubule translocation by immobilized wild type, V2, and V1 dynein motor domains at 1.6 nM input concentration. (e) Plot of microtubule gliding velocity. Lines show mean values (± s.d.). n = 312 microtubule gliding events (WT), n = 157 (V2), n = 91 (V1). Experiments were carried out in duplicate with two different protein preparations. cDNA complementary DNA, mRNA messenger RNA, SNP single-nucleotide polymorphism.