Volume 102, Issue 2, Pages (July 2000)

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Volume 102, Issue 2, Pages 175-187 (July 2000) Genetic Evidence for Selective Transport of Opsin and Arrestin by Kinesin-II in Mammalian Photoreceptors  Joseph R Marszalek, Xinran Liu, Elizabeth A Roberts, Daniel Chui, Jamey D Marth, David S Williams, Lawrence S.B Goldstein  Cell  Volume 102, Issue 2, Pages 175-187 (July 2000) DOI: 10.1016/S0092-8674(00)00023-4

Figure 1 Generation and Characterization of New KIF3A Alleles and creIRBP Transgene (A) LoxP sites were introduced into intronic sequence that flank the second protein coding exon to generate the KIF3A flox allele. Removing the DNA between the loxP sites produced the KIF3A null allele. Location of the PCR primers used to identify the KIF3A alleles are labeled. The creIRBP transgene construct and the location of the primers that were used to score for the presence or absence of the transgene in mice are pictured at the bottom. (B) Western immunoblot probe for KIF3A protein in 10 μg of total retina and brain extract from KIF3A flox/KIF3A flox and KIF3A WT/KIF3A WT using anti-KIF3A antibody (Marszalek et al. 1999). (C) Ethidium bromide–stained gels showing the presence or absence of the creIRBP transgene in mouse tail DNA (upper panel) and which KIF3A alleles are present (lower panel). Cell 2000 102, 175-187DOI: (10.1016/S0092-8674(00)00023-4)

Figure 2 Variation in Extent of Recombination with the creIRBP Transgene (A) Ethidium bromide–stained gel of a dilution series of various mixtures of KIF3A null/KIF3A WT and KIF3A flox/KIF3A WT neuroretina DNA. (B) Graph comparing the actual percentage of KIF3A null allele in each mixture to that calculated from the KIF3A null and KIF3A flox band intensities of the ethidium bromide–stained gel in (A). Note the linearity of the dilution series. (C) Graph showing the percentage of KIF3A null allele observed in the retinas of KIF3A flox/KIF3A WT; creIRBP animals at various ages. (2 weeks, n = 11; 3 weeks, n = 28; 3.5 weeks, n = 10; 4 weeks, n = 15; 10–30 weeks, n = 26). (D) Cartoon of a photoreceptor that depicts the different regions of a photoreceptor cell. (E–G) Light microscopy images of retinas from 10-week-old animals. (E) A normal retina from a KIF3A WT/KIF3A WT animal. (F) A moderately affected retina from a KIF3A flox/KIF3A null; creIRBP animal. (G) A severely affected retina from a KIF3A flox/KIF3A null; creIRBP animal. The light staining of INL nuclei in (G) is due to this retina being embedded in LR White, while (E) and (F) are in epon. Also note the decrease in the number of photoreceptor nuclei and the decrease in the length of inner and outer segments in (E) and (F). (H) Graph showing the distribution of photoreceptor cell number among 10-week-old animals. (KIF3A Wild Type, n = 6; KIF3A Heterozygous, n = 13; KIF3A Null, n = 8). Note the broad distribution of cell number among mutants and that more than 50% of the mutant animals have less photoreceptor nuclei than the lowest control animals. OS, outer segment; IS, inner segment; ONL, outer nuclear layer; OPL, outer plexiform layer; INL, inner nuclear layer; RGL, retinal ganglion layer. Scale bar = 50 μm. Cell 2000 102, 175-187DOI: (10.1016/S0092-8674(00)00023-4)

Figure 3 Ultrastructural Abnormalities Observed in Photoreceptors from KIF3A flox/KIF3A null; creIRBP Retinas (A–D) Retina from a KIF3A flox/KIF3A null; creIRBP animal. (A) EM micrograph of a proteinaceous accumulation of material in the inner segment of a mutant photoreceptor cell (arrow). Note the normal inner segment in the cell that is on the right of the mutant cell (asterisks). (B) Immunogold labeling of a proteinaceous accumulation for opsin (arrow). Note the minimal labeling within the accumulation (star). (C) Immunogold labeling of a cell whose outer segment has undergone fragmentation (arrows). (D) Immunogold labeling of photoreceptor cells for opsin. Note the gold particles in the inner segment of a mutant photoreceptor cell (arrows) that is surrounded by normal cells that do not show opsin signal (asterisks). The black lines outline the inner segment of a mutant cell. OS, outer segment; IS, inner segment. Scale bar = 1 μm. Cell 2000 102, 175-187DOI: (10.1016/S0092-8674(00)00023-4)

Figure 4 Misaccumulation of Opsin and Apoptotic Photoreceptor Cell Death in KIF3A flox/KIF3A null; creIRBP Animals (A–C) Immunofluorescent staining for opsin. (A) A retina from a KIF3A WT/KIF3A WT animal. (B) A moderately affected retina from a KIF3A flox/KIF3A null; creIRBP animal. (C) A severely affected retina from a KIF3A flox/KIF3A null; creIRBP animal. Note the accumulation of opsin in some inner segments (arrowhead), cell bodies (arrows), and synapse (open arrowhead) in (C). The asterisk denotes the OPL. (D and E) Double labeling for opsin (green) and TUNEL positive cells (red). (D) A KIF3A WT/KIF3A WT retina. (E) A retina from a KIF3A flox/KIF3A null; creIRBP animal. Note that most cells that are TUNEL positive exhibit aberrant opsin localization (open arrowhead), but most cells that misaccumulate opsin are not TUNEL positive (arrowhead). A rare TUNEL positive, opsin negative cell is noted with an arrow. OS, outer segment; IS, inner segment; ONL, outer nuclear layer. Scale bar = 5 μm. Cell 2000 102, 175-187DOI: (10.1016/S0092-8674(00)00023-4)

Figure 5 Selective Disruption of Transport in Mutant Photoreceptors (A) Immunofluorescence of a KIF3A WT/KIF3A WT retina stained for the synaptic protein SV2. (B–D) A retina from a KIF3A flox/KIF3A null; creIRBP animal. (B) Stained for SV2. (C) Stained for opsin. (D) Merge of B (red) and C (green). Note that the SV2 signal is limited to the synaptic region. (E) A KIF3A WT/KIF3A WT retina stained for the cytosolic protein arrestin. (F–H) A retina from a KIF3A flox/KIF3A null; creIRBP animal. (F) Arrestin. (G) Opsin. (H) Merge of (F) (red) and (G) (green). (I) A KIF3A WT/KIF3A WT retina stained for the outer segment protein peripherin. (J–L) A retina from a KIF3A flox/KIF3A null; creIRBP animal. (J) Peripherin. (K) Opsin. (L) Merge of (J) (red) and (K) (green). Some inner segments accumulate only opsin (green arrowheads), while others also have some misaccumulated peripherin (red arrowheads). (M) A KIF3A WT/KIF3A WT retina stained for the membrane associated protein α-transducin. (N–P) A retina from a KIF3A flox/KIF3A null; creIRBP animal. (N) Stained for α-transducin. (O) Stained for opsin. (P) Merge of (N) (red) and (O) (green). OS, outer segment; IS, inner segment; ONL, outer nuclear layer; OPL, outer plexiform layer. Scale bar = 5 μm. Cell 2000 102, 175-187DOI: (10.1016/S0092-8674(00)00023-4)

Figure 6 Organelles and Opsin Processing Are Not Altered in Mutant Photoreceptors (A) A retina from a KIF3A WT/KIF3A WT animal stained for Cox I (mitochondria). Mitochondria are concentrated in the distal portion of the inner segment (black line at right of (D). (B–D) A retina from a KIF3A flox/KIF3A null; creIRBP animal. (B) Stained for Cox I. (C) Stained for opsin. (D) Merge of (B) (red) and (C) (green). (E) A retina from a KIF3A WT/KIF3A WT animal stained for calreticulin (endoplasmic reticulin). The ER is normally found throughout the inner segment and cell body (black line at right of H). (F–H) A retina from a KIF3A flox/KIF3A null; creIRBP animal. (F) Stained for calreticulin. (G) Stained for opsin. (H) Merge of (F) (red) and (G) (green). (I) A retina from a KIF3A WT/KIF3A WT animal stained for giantin (Golgi apparatus). The Golgi apparatus is normally concentrated in the proximal portion of the inner segment (black line at right of L). (J–L) A retina from a KIF3A flox/KIF3A null; creIRBP animal. (J) Stained for giantin. (K) Stained for opsin. (L) Merge of (K) (red) and (L) (green). Note the similarity in the distribution of Cox I, calreticulin and giantin staining between KIF3A WT/KIF3A WT and KIF3A flox/KIF3A null; creIRBP retinas. Also note that none of the organelles examined undergo obvious redistribution within the mutant photoreceptor cells (i.e., no redistribution to the cell body). (M) A retina from a KIF3A WT/KIF3A WT animal stained with the lectin Concanavalin A (glycosylated opsin). (N–P) A retina from a KIF3A flox/KIF3A null; creIRBP animal. (N) Stained with the lectin Concanavalin A. (O) Stained for opsin. (P) Merge of (N) (red) and (O) (green). OS, outer segment; IS, inner segment; ONL, outer nuclear layer. Scale bar = 5 μm. Cell 2000 102, 175-187DOI: (10.1016/S0092-8674(00)00023-4)

Figure 7 A Model for Opsin Transport to the Photoreceptor Outer Segment by Kinesin-II (A) Opsin is processed in the Golgi apparatus and put into vesicles. (B) The carboxyl tail of opsin may interact with the Tctex-1 dynein light chain and is transported along microtubules to the basal body (Tai et al. 1999). (C) At the basal body the opsin-containing vesicle may fuse with the plasma membrane. Once in the plasma membrane, kinesin-II may interact directly with opsin (D) or through a raft complex (E) and be transported to the outer segment. (F) Arrestin may also be transported to the outer segment through the connecting cilium by kinesin-II. Cell 2000 102, 175-187DOI: (10.1016/S0092-8674(00)00023-4)