Cloning, Expression Pattern, and Chromosomal Assignment to 16q23 of the Human γ-Adaptin Gene (ADTG)

Abstract

Adaptins are important components of clathrin-coated vesicles transporting ligand–receptor complexes from the plasma membrane or from thetrans-Golgi network to lysosomes. Adaptins, together with medium and small subunits, form a heterotetrameric complex called an adaptor, whose role is to promote the formation of clathrin-coated pits and vesicles. We present the cloning and sequencing of the human γ-adaptin cDNA (HGMW-approved symbolADTG) consisting of 3723 bp with an open reading frame capable of encoding a protein of 825 amino acids, 98.9% identical to the mouse protein. Northern blot analysis of the mouse and human γ-adaptin genes revealed a ubiquitous and abundant expression, except in human adult lung. Using a monochromosomal somatic cell hybrid panel and fluorescencein situhybridization, we mapped this gene to human chromosome 16q23, which is syntenic with mouse chromosome 8, band D. In addition, we localized genes for two other components of the AP-1 adaptor, i.e., the medium (AP47) and small (AP19) subunits, to chromosomes 19 and 7, respectively. Expression analysis of these genes in human tissues revealed ubiquitously expressed transcripts of approximately 2.5 and 1.5 kb, respectively.