Contributes to mitotic spindle assembly, maintenance of centrosome integrity and completion of cytokinesis as part of the HAUS augmin-like complex. Component of the HAUS augmin-like complex. The complex interacts with the gamma-tubulin ring complex and this interaction is required for spindle assembly. Associates with microtubules. The interaction with microtubules is strong during mitosis, while it is weak or absent during interphase. It is unclear whether this interaction is direct or indirect. Interacts with EML3 (phosphorylated at 'Thr-881') (PubMed:30723163). Localizes with the spindle poles in mitotic cells. In metaphase, localizes to the mitotic asters and is highly punctate on the microtubule array. During later stages of mitosis, remains on the spindle but is not present at the interzone, and is finally observed at the microtubule bundles proximal to the midbody, clearly excluded from the midbody. In contrast, does not colocalize with the tubulin cytoskeleton in interphase cells. In interphase, localized at the centrosome and diffusely in the cytoplasm. Localizes to mitotic spindle microtubules. Widely expressed. Expressed in pancreas, kidney, skeletal muscle, liver and heart. Weakly expressed in lung, brain and placenta. HAUS1-depleted cells retain functional cell cycle checkpoints, but the depletion decreases the G2/M cell cycle compartment and induces apoptosis. The protein level remains constant through the cell cycle. Belongs to the HAUS1 family.