User:Jjlin100/sandbox
Douglas G. McMahon | |
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| Born | Error: Need valid birth date: year, month, day |
| Alma mater | University of Virginia Harvard University |
| Scientific career | |
| Fields | Biology |
Gene David Block (born August 17, 1948)[1] is an American biologist, academic, inventor, and chancellor of the University of California, Los Angeles. He attended Stanford University for his BA, and subsequently received his MS and PhD in psychology from the University of Oregon in 1975. Block was then provost and professor of biology at the University of Virginia, and was later succeeded by Arthur Garson, Jr. While at the University of Virginia, Block interacted with Randy Pausch and is mentioned in his memoir, The Last Lecture.
Before becoming chancellor of UCLA, Block had an extensive scientific career. His early work with mollusks investigated the structure and function of basal retinal neurons (BRN) in circadian photoentrainment. He was the first to discover a cell-autonomous circadian pacemaker and concluded that BRNs are both necessary and sufficient for photoentrainment. Later in his career, Block explored the molecular basis of circadian rhythms in mammals, and found that calcium flux was necessary for circadian rhythmicity. His most recent research, which he is still working on today, is largely focused on the effect that aging has on the circadian clock.
Biography
[edit]Early life and family
[edit]Block was born in Monticello, New York, the grandson of Eastern European immigrants.Cite error: The <ref> tag has too many names (see the help page). His father and uncle owned Mountain Dairies, a retail/wholesale distributor that served many of the hotels and camps that populated the Catskill region of New York. During high school summers he worked at the dairy as a truck driver, starting his days at 4am for early morning deliveries to summer camps and hotels. He also played piano in a trio that provided dance music for Saturday evening parties at several bungalow colonies within the "Borscht Belt". His hobbies included electronics and shortwave radio. He played varsity tennis at Monticello High School.
Education
[edit]Block received the BA from Stanford University in 1970, followed by the MS and PhD in 1972 and 1975, respectively, from the University of Oregon; all of these degrees were in psychology. From 1975-1978, he returned to Stanford for postdoctoral work with Donald Kennedy, who later became president of Stanford, and Colin Pittendrigh, who is known as the “father of biological timing. During this time Block studied how voluntary movements inhibit sensory feedback in the crayfish working in the Kennedy lab while studying issues of circadian biology with Colin Pittendrigh.
Marriage and children
[edit]In 1970, Block married Carol Kullback Block, also from Monticello. Presently, Block and his wife are parents of two grown children and a grandchild. Block enjoys making time for his hobbies that include tinkering with cars and his collection of 50 antique radios.[2]
Employment history
[edit]In 1978, Block became a member of the faculty in the Department of Biology of University of Virginia. Here, Block served as the vice provost for research and public service from 1993-1998, and then 2001 he was appointed as vice president. Furthermore, during this time from 1991-2002, Block also served as the founding director of the National Science Foundation (NSF) Science and Technology Center in Biological Timing.[3]
According to Block, “The center raised the national visibility of the University in biological and medical research, and gave us reputational leverage in the U.S. as well as in Europe and Japan...Most importantly, the center’s scientific accomplishments have been spectacular. We’ve done some high-risk research that has paid off greatly; some of it has fundamentally changed our understanding of biological processes.”[4]
One of the center’s biggest advances, largely by Joseph Takahashi, was the development of a mutant mouse that allowed for the identification and cloning of the “Clock” gene for the biological clock in a mouse in 1997. This was the first such gene to be identified at the molecular level in a mammal. This groundbreaking discovery was a result of the Clock Genome Project, which uses "forward genetics" to discover the genes regulating circadian clocks in mice, fruit flies, and plants. In addition, this work also led to the discovery of many other genes that regulate the biological clock.[5]
In 1997 and 1998, the reputable journal Science ranked the findings of the NSF Center in Biological Timings among the top 10 in biological research breakthroughs.[5]
Finally, Block was appointed Chancellor of UCLA in 2007. His selection was announced on 21 December 2006, succeeding interim office holder Norman Abrams on 1 August 2007. As chancellor, Gene Block has faced the challenge of steering UCLA through a severe budget crisis.[6] Despite being regarded a top leader, Chancellor Block has nonetheless overseen steep tuition increases. Chancellor Block holds a periodic student office hour and sometimes breakfasts with groups of students. Chancellor Block has also focused attention on non-faculty staff, including regular staff/chancellor breakfast. In addition, Mrs. Block hosts staff at athletic events and student musical recitals at their residence. Chancellor Block holds UCLA faculty appointments in psychiatry and bio-behavioral sciences in the David Geffen School of Medicine and in physiological science in the College of Letters and Science.[7]
Scientific achievements
[edit]Cell-autonomous circadian pacemakers
[edit]While at the University of Virginia, Block worked extensively with his graduate student, Dr. Douglas G. McMahon, the 1986 winner of the Society for Neuroscience's Donald B. Lindsley Prize in Behavioral Neuroscience, on the functioning of the circadian pacemaker system at the cellular level in Bulla gouldiana. In 1984, Block's students conducted a continuous 74 hour intracellular recording in constant darkness demonstrating that basal retinal neurons (BRN) in the Bulla eye exhibit clear circadian rhythms. These rhythms were also shown to be correlated one-for-one with the compound action potentials produced by the optic nerve.[8] The change in membrane potential of the BRNs, which are electrically coupled, were shown to precede or occur simultaneously with the increased compound action potential frequency. An increase in firing frequency, and depolarization of the BRNs, was seen during the day, and the reverse at night. These results demonstrated that the BRNs were at minimum an output for the pacemaker pathway and provided evidence that they were good candidates for being circadian pacemaker neurons.
This research was expanded several years later by a breakthrough Science paper in which Dr. Stephan Michel, and others working in Block's laboratory, demonstrated that circadian rhythms in BRN membrane conductance could persist spontaneously in isolated BRNs.[9] These spontaneous circadian rhythms were shown for BRNs in isolation from other retinal cells and in isolation from each other. Block's lab showed that these circadian rhythms in membrane conductance were caused primarily by a potassium ion current. BRNs in isolation demonstrated the same patterns shown in Block's previous work in which membrane conductance decreased at dawn and increased at dusk. That similar patterns were seen in isolated cells as in previous multiple cell cultures provided the first strong evidence that individual neurons possessed the capacity to generate circadian rhythms. This research definitively concluded that BRNs are both necessary and sufficient for photoentrainment in Bulla.
Necessity of calcium flux for rhythmicity
[edit]Block and colleagues hypothesized that ion movement across cell membranes plays a role in the generation of circadian rhythms. In 2005, his lab measured rhythms in rat suprachiasmatic nuclei (SCN) in various concentrations of calcium ions. Block found that as calcium concentration decreased, thus lowering the transmembrane ion movement, the amplitude of circadian rhythmicity also decreased.[10] With no calcium added, there was no circadian rhythm at all. Block's lab repeated the experiment with rat liver tissue and mouse SCN tissue and found the same results in each case. This demonstrated that across species and tissues, transmembrane calcium flux is necessary for the generation of circadian rhythms. However, there are still some questions about the function of calcium flux. In this experiment, Block also tried adding calcium channel blockers to the tissues. Rhythmicity did disappear, but it took several cycles, and it is unknown why rhythmicity was not immediately abolished. In addition, Block suspects that calcium flux plays a role in the entrainment of the mammalian clock to the environment, similar to its role in mollusk entrainment.
Effects of aging on the circadian clock
[edit]Block has also studied the effect that aging has on the circadian system, collaborating with other leading chronobiologists including Michael Menaker. In 2002, he studied rhythmicity in rats of various ages and found that aging affected rhythmicity differently in different tissues. In the SCN, the intrinsic period shortened with age, while lung tissue often became arrhythmic (showing sporadic activity) and pineal and kidney tissues became phase advanced.[11] In 2008, Block exposed rats of various ages to different light cycles, and found that phase advances took longer in the SCN in old rats than in young rats, but pineal tissues advanced faster in older rats. Liver tissues did not phase shift at all when the light cycle was advanced.[12] These studies together have shown how complex the aging process is in the circadian system. Block notes that some, though not all, of these changes are likely influenced by diminishing synchronizing signals from the SCN. In 2006, Block observed that jetlag significantly increased the death rate in older mice, which highlights the medical importance of understanding the aging process of the circadian system.[13]
Inventions
[edit]| Non-contact respiratory monitor for the prevention of Sudden Infant Death Syndrome | with Dr. W. Otto Friesen, assigned to the Alumni Patents Foundation - Patent Issued.[3] |
| Sonic leveling device | assigned to the Alumni Patents Foundation |
| Speaking aid for movement restricted patients | assigned to the Alumni Patents Foundation |
| Two chambered disposable hospital urinal | assigned to Alumni Patents Foundation |
| Remote slave alarm for battery operated fire and smoke sensors | assigned to University of Virginia Patent Foundation |
| AI operator fatigue monitor | assigned to University of Virginia Patent Foundation |
Honors and awards
[edit]2009: Los Angeles NAACP Foundation Presidents’ Award
2006: Japan Prize in Biology selection committee
2004: Navigator Award, Virginia Piedmont Technology Council
2003: Pioneer Award, National Science Foundation (NSF Centers Program)
1998: Commonwealth of Virginia, Outstanding Public Service Award
1997: Fellow, American Association for the Advancement of Science
1997: Chairman, Gordon Conference on Chronobiology
1997: Visiting Fellow, Japan Society for the Promotion of Science
1996 – 1998: President, Society for Research on Biological Rhythms
1995: Glaser Distinguished Visiting Professor, Florida International University
1993: Alumni Council Thomas Jefferson Professor (endowed chair)
1988 – 1991: Treasurer: Society for Research on Biological Rhythms
1983 – 1988: Research Career Development Award, National Institutes of Health
1975 – 1978: National Institutes of Health Postdoctoral Fellowship, Stanford
1970: Graduation with distinction, Stanford University, Stanford [3]
Positions
[edit]Block has served on over numerous advisory boards and committees. His most recent positions include:
Board of Directors, (chair) National Institute of Aerospace (2006—2007)
Board of Directors, Carilion Biomedical Institute (1999—present)
Board of Directors: Charlottesville Free Clinic (2002—present)
Board of Directors, Spinner Inc., Charlottesville, Virginia (2000–present)
Program Advisory Committee(Chair) Specialized Neuroscience Research Program (SNRP), Univ. Alaska, Fairbanks (2005—present)
Affiliations
[edit]Block also is a member in many scientific societies:[3]
Society for Neuroscience
American Association for the Advancement of Science
Society for Research on Biological Rhythms
Opposition to Proposition 209
[edit]On February 24, 2014, Block sent an open letter to the whole UCLA community expressing his strong opposition to Proposition 209.[14] His main point in this letter was merit based selection system damages diversity on campus.
See also
[edit]
- circadian rhythm
- Michael Menaker
- chronobiology
- University of California, Los Angeles
- Society for Neuroscience
References
[edit]- ^ "Gene Gene Block". Marquis Who's Who.
- ^ "UCLA chancellor Gene Block tackles economy, civic responsibility". JewishJournal.
- ^ a b c d "Curriculum Vitae Gene D. Block". University of California.
- ^ "Clock stops on NSF biological timing center, but the momentum carries on".
- ^ a b "First Circadian Clock Gene Identified and Cloned in Mammals". National Science Foundation.
- ^ "Chancellor Block addresses scope of budget crisis, plans and priorities". UCLA Today.
- ^ "UCLA Chancellor Gene Block". University of California.
- ^ McMahon, Douglas G.; et al. (1984). "Cellular analysis of the Bulla ocular circadian pacemaker system". J Comp Physiol A. 155: 379–385.
{{cite journal}}: Explicit use of et al. in:|author2=(help) - ^ Michel, Stephan; et al. (1993). "Circadian Rhythm in Membrane Conductance Expressed in Isolated Neurons". Science. 259: 239–241. doi:10.1126/science.8421785. PMID 8421785.
{{cite journal}}: Explicit use of et al. in:|author2=(help) - ^ Lundkvist, Gabriella; Yongho Kwak; Erin Davis; Hajime Tei; Gene Block (17 August 2005). "A calcium flux is required for circadian rhythm generation in mammalian pacemaker neurons". The Journal of Neuroscience. 25 (33): 7682–7686. doi:10.1523/JNEUROSCI.2211-05.2005. PMID 16107654.
- ^ Yamazaki, Shin; Marty Straume; Hajime Tei; Yoshiyuki Sakaki; Michael Menaker; Gene Block (6 August 2002). "Effects of aging on central and peripheral mammalian clocks". National Academy of Sciences. 99 (16): 10801–10806. doi:10.1073/pnas.152318499. PMID 12149444.
- ^ Davidson, Alec; Shin Yamazaki; Deanna Arble; Michael Menaker; Gene Block (March 2008). "Resetting of central and peripheral circadian oscillators in aged rats". Neurobiology of Aging. 29 (3): 471–477. doi:10.1016/j.neurobiolaging.2006.10.018. PMID 17129640.
- ^ Davidson, AJ; MT Sellix; J Daniel; S Yamazaki; M Menaker; GD Block (7 November 2006). "Chronic jet-lag increases mortality in aged mice". Curr Ciol. 16 (21): R914-R916. doi:10.1016/j.cub.2006.09.058. PMID 17084685.
- ^ The Impact of Proposition 209 and Our Duty to Our Students
External links
[edit]- UCLA Newsroom: Gene D. Block Named New UCLA Chancellor
- UCLA Chancellor Gene Block
- Society for Research on Biological Rhythms
- Brain Research Institute UCLA
- Dictionary of Circadian Physiology
DEFAULTSORT:Block, Gene D. Category:1948 births Category:Living people Category:American academics Category:University of Virginia faculty Category:Leaders of the University of California, Los Angeles Category:Stanford University alumni Category:University of Oregon alumni Category:University of California, Berkeley alumni Category:People from Monticello, New York Category:Jewish American scientists