Richard Behringer
@rrbehringer
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Developmental biologist, geneticist, & reproductive biologist. PhD. Son of an immigrant. Hispanic Filipino American.
Houston, TX
Joined July 2013
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Human embryo, 46,XX , CS14, high resolution episcopic microscopy (HREM).
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Developing nervous system of a 7-day old chick embryo captured with a mesoSPIM microscope. Image:
@SocDevBio
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32-cell sea urchin embryo expressing 3xGFP-ensconsin microtubule binding domain (blue) & membrane RFP-utrophin actin binding domain (yellow). George von Dassow & Bill Bement.
@NIGMS
Center for Cell Dynamics
@UW
@___SDB___
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Instead of looking for a
#DudeWall
at my institution, I decided to create a wall of outstanding women scientists (all Full Professors) currently in my field of developmental biology. This is just a fraction of the pioneers in our field.
@pollyp1
#ScienceTwitter
@___SDB___
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Drosophila pupae removed from pupae case continue last 5 days of development into mature fruit flies. From Microscope Imaging Station
@exploratorium
@___SDB___
@GeneticsGSA
@the_Node
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Stage 19 bat 🦇 (Carollia perspicillata) embryo. We thank the referees for allowing us to call this the Peek-A-Boo stage 😀. Knees 🦵 on back of legs, embryo looking at pads of feet 🦶 .
@___SDB___
@the_Node
@SICB_
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3D volume rendering of microCT scan of an E18.5 mouse embryo & viewed in coronal, transverse, and sagittal section planes. See Hsu et al., 2016.
@___SDB___
@bcmhouston
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Rachel Mullen was practicing vascular injections with India ink in chick embryos in anticipation of primordial germ cell injections into blood vessels to make germline chimeras.
@___SDB___
@the_Node
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The welcome to our lab sign came in today. Drawing by
@ale_elder
L-R, mouse, bat, wallaby. Do you know which TV show the bottom phrase comes from?
#DiversityandInclusion
@MDAndersonNews
@___SDB___
@the_Node
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Feeling nostalgic today. I am retiring the
@PerkinElmer
PCR (Thermal Cycler) machine used to set up the lab 30 years ago
@MDAndersonNews
. It still works & never needed repair. I used it to identify my first knockout mouse ES cell clones.
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Described to my grad students (both born after 1995) today how we used to do
#plasmid
🧬preps using CsCl density gradients generated by ultracentrifugation 😲. I offered to show them how. They asked if we still had an ultracentrifuge.
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I tip my hat to Ken-ichi Inoue doing this pronuclear microinjection into an opossum zygote. The shell & mucoid coat of
#marsupial
zygotes make injections very challenging. The injector makes it look so easy. Very elegant.
@ISTT_TG
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When you look at emojis differently.
🎶♌️sperm
©️ dorsal lip of frog gastrula
🔘cell with nucleus
🔴red blood cell
👁🗨neuron extending axon
〰️C. elegans
🌐32-cell embryo
‼️ chromosomes
🚫2-cell embryo
♈️developing female mouse repro tract
♋️zebrafish embryos
@___SDB___
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Caecilian embryos (Ichthyophis kohtaoensis), showing their crazy, beautiful gills! Dünker et al., 2000.
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Time flies. This month marks my 30 yr anniversary as an independent investigator, studying mammalian developmental genetics
@MDAndersonNews
& teaching
@MDA_UTHGrad
@bcmhouston
@cshlcourses
@MBLScience
@LASDB_DevBiol
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I have been curious about the various larval forms of marine invertebrates. There are a bunch of them with mysterious names (tornaria, cydippid, veliger, auricularia etc). Here's a wonderful visual presentation from
@bc_vellutini
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Here's summary of zygote sizes for invertebrates & vertebrates used in developmental biology research. I will be working with Xenopus tropicalis 🐸 zygotes soon
@XenopusNXR
@MBLScience
. They are similar in diameter to zebrafish zygotes.
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Genome edited opossums!!! Kiyonari & colleagues achieve a transformative step in mammalian genetics. So many technical hurdles were overcome in this tour de force study. Marsupials with both alleles mutated can be generated in one generation.
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Ants 🐜& spiders 🕷️, not. Scratching my head to imagine how gene regulatory networks evolved to create these complex wing patterns.
#evolution
@___SDB___
@SICBtweets
@GeneticsGSA
@the_Node
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Got somites? Beauty rat snake (Elaphe taeniura) embryo. 72 hr after oviposition. Bertola et al.
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Wnt History. In 1973, the original wingless (wg) mutation was first reported in
#Drosophila
by RP Sharma @ Indian Agricultural Research Institute in New Delhi 🇮🇳. A follow up study was reported in
@Dev_Bio_Journal
-
@SocDevBio
@InSDB_79
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Asian house shrew (Suncus murinus). Elongated snouts compared to mouse.
@___SDB___
@SCGDB1
@the_Node
@SICB_
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Our lab has been fortunate to study the developmental biology of these organisms: mouse 🐭, rat 🐀, wallaby 🦘, opossum, bat 🦇, thylacine, cetacean, siphonophore, chick 🐣, frog 🐸, lizard 🦎. Comparisons of their development highlight conserved & diverse processes.
@___SDB___
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Applications are open for the
@MBLScience
Embryology Course (May 24 -June 30, 2021) for those passionate about developmental biology.
@___SDB___
@the_Node
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Happy birthday Ed Lewis
@Caltech
@NobelPrize
! Here is the first video of LIVE 4-winged bithorax mutant flies. Video generated by Chang-Ru Tsai (Galko Lab), Dept. of Genetics
@MDAndersonNews
@bcm
graduate.
@___SDB___
@the_Node
@GeneticsGSA
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1st cloned Przewalski’s horse born Aug 6. Nucleus from stallion cells cryopreserved ~40 yrs ago in San Diego Zoo Global Frozen Zoo® introduced into oocyte from domestic horse.
@SSRepro
@___SDB___
@the_Node
@GeneticsGSA
@sdzglobal
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Stage 16 fruit bat (Carollia perspicillata) embryo. Forelimbs have a triangular shape but hindlimbs have a paddle shape. The patagium (membrane) between the limbs is forming.
@___SDB___
@the_Node
@SICB_
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Mouse embryo, embryonic day 10.5, high resolution episcopic microscopy (HREM). Deciphering the Mechanisms of Developmental Disorders (DMDD) website shows wild-type & mutant mouse embryos for many genes.
@GeneticsGSA
@___SDB___
@the_Node
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Ginny Papaioannou & I published the 2nd Edition of Mouse Phenotypes today! Check it out! 🐭
@CSHLPress
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Stage 13 bat 🦇 embryo removed from surrounding yolk sac & amnion. Forelimbs & hindlimbs appear like any other quadruped vertebrate embryo but will differentiate into wings for powered flight. 🇹🇹
@___SDB___
@the_Node
@SICB_
@UWI_StAugustine
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Striped pajama
#squid
(Sepioloidea lineolata) newly hatched
@MBLScience
#embryo2017
. Cephalopods 🦑🐙 are charming.
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The International Society of Differentiation is pleased to announce new Editors-in-Chief for the journal Differentiation! Drs. Loydie Jerome-Majewska, Crystal Rogers, & Rosa Uribe. Best wishes for great success!
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Here are the results of our professionally sharpened old dull forceps. It is stunning. Tips match perfectly. There is no way we could have sharpened these forceps to this extent with our stones & sand paper.
@___SDB___
@SICB_
@InfoIzfs
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I interviewed a grad school candidate yesterday
@MDA_UTHGrad
. She asked 'what is the hardest thing about grad school?'. I said 'removing the psychological barriers we place on our abilities'. We are capable of much more than we realize is possible.
@___SDB___
@SSRepro
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I generated a figure of the sizes of animal zygotes for species used in developmental biology studies.
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What?! The
#Drosophila
male genitalia rotates 360° clockwise 🤔 beginning ~24 hr after pupation & finishes ~12 hr later; resulting in spermiduct looping around hindgut. Complete rotation required for fertility.
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I never thought I would be excited to learn that my picture was hanging in a bar but it is the Cold Spring Harbor Lab bar where I have spent many nights during conferences & courses discussing science. 🍷🍺🧬🔬🐭
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Mammalian preimplantation embryo! Note the head region, neural tube, heart, many pairs of somites, vasculature in this embryo free-floating as a sphere in the uterus. It is a marsupial (tammar wallaby). From
@MarilynRenfree
@unimelb
@___SDB___
@the_Node
@SICBtweets
@SSRepro
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25 years ago today
@nature
, Bill Shawlot & I reported that Lim1-null mice lacked anterior head structures, suggesting that this LIM-homeobox gene was an essential regulator of the vertebrate head organizer.
#headlessmice
@___SDB___
@the_Node
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African pygmy mouse 🐭 (Mus minutoides) from the University of Montpellier colony. One of the smallest rodents. Weighs 3-12 gm. It has a novel sex determination mechanism with a high frequency of XY females. Photo credit: Frederic Veyrunes.
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During summer evenings (1911-1913), Ernest E. Just
#blackscientist
with lantern in hand would lie on a dock in Eel Pond, Woods Hole to collect polychaete worms for studies of fertilization. This continues each year in the
@MBLScience
Embryology course.
@biyolokum
@___SDB___
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Sending blunted forceps & dull scissors for professional sharpening. I think this will be less expensive than buying new instruments. We will find out with this test run.
@___SDB___
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The tammar wallaby (Macropus eugenii) is a model kangaroo 🦘 for developmental and reproductive biology studies. Embryos in panels A-C are still free floating not implanted in the uterus. Much of development occurs after birth.
@MarilynRenfree
@___SDB___
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How to make jellyfish in the lab? Induce strobilation! Polyp to jelly in under a week. Each segment/ring becomes a jelly. So many possible studies open up.
@RebeccaRHelm
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I just completed
@racingtheplanet
Atacama Crossing in Chile 🇨🇱. A self supported multistage ultramarathon. 250 km over 6 Stages. We carry all our gear & food. Water, tents, & medical support provided. High altitude, hot desert, varied terrain. More than a race.
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I got
#covid
vaccinated (Moderna) yesterday
@MDAndersonNews
- my arm feels great today with only very minor soreness at injection site.
@___SDB___
@the_Node
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US endangered black-footed ferret cloned from cells frozen in 1988. Born from a domestic ferret surrogate mother.
@SSRepro
@___SDB___
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Giraffe 🦒 form of beetle? I wonder what embryonic development looks like in head region? Trachelismus beetle
@frankcanonphoto
🤔
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Look at that little nubbin of forelimb in the developing emu embryo! Makes me think of T. rex 🦖
@___SDB___
@SICB_
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2nd exon discovered in Sry gene required to stabilize protein for male sex determination. Exon 2 deletion results in XY females (L), expression of exon 2 isoform in XX embryos results in males (R). Makoto Tachibana Lab, Osaka/Tokushima.
@ScienceMagazine
@___SDB___
@the_Node
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I finished a 250 km, self-supported, multistage ultramarathon in Namibia w/
@racingtheplanet
. The race thru the desert was really tough because of heat 🥵(up to 54oC). The desert was beautiful & harsh. There were over 120 competitors from 46 countries.
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This 8X finisher
@ironman
was humbled by
@racingtheplanet
Atacama Crossing multistage ultramarathon in Chile. I got thru Stage 1 but only 3/4 way for Stage 2. I underestimated many things but I learned a lot & got to meet so many wonderful people from around the world.
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Bat 🦇 species have different
#uterus
morphologies. The bat we study, Carollia perspicillata, has a simplex uterus like human. They have a cycle of ~1 month, true
#menstruation
, & 1 baby after ~4 month gestation. 🤔
@SSRepro
@___SDB___
@the_Node
@SICB_
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Short-tailed fruit bat embryo (Carollia perspicillata), Stage 16. Note differences in fore- and hindlimbs. Mammalian wing development.
@___SDB___
@SICBtweets
@the_Node
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Japanese striped
#snake
(Elaphe quadrivirgata) development. Ex vivo culture method. Up to Panel G it could be almost any vertebrate. Matsubara et al. 2014.
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Human HOX genes expressed in transgenic mice display spatial colinearity.
@Diff_Journal
@SocDevBio
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Dr. Andres Collazo
@Caltech
has taught in the
@MBLScience
Embryology Course for 26 years! At 24 students per year that is over 600 students trained in advanced microscopy to study animal development. Always helpful, patient & kind. 🏆🥇 👏👏👏
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I'm headed to Chile 🇨🇱 today for a 7-day multistage ultramarathon with
@racingtheplanet
thru the Atacama Desert. I have never done an ultramarathon! Race starts Sunday. We carry all our equipment & food from camp to camp. An adventure.
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"Latin word lārva means evil spirit, ghost or mask". "stage in the life of an animal in which its adult form is still hidden or masked". Beautiful image compilation by Bruno Vellutini
@bc_vellutini
@SocDevBio
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She rebounded & earned her PhD
@Penn
in 1940. Then Asst Professor at North Carolina College for Negroes
@NCCU
. Later Head of the Biology Department
@ShawUniversity
. Activist scientist. She wrote “Not failure, but low aim is a crime.”
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I am inspired by these outstanding junior & established developmental biologists (all PhDs) for their research achievements, teaching/mentoring, & outreach. Role models. Intl Day of Women & Girls in Science.
@___SDB___
@the_Node
@WhiteHouse
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Yesterday I finished the 50th anniversary Honolulu Marathon. It started at 5 am with fireworks. Lots of ocean views. No cutoff time. Still walking gingerly today. 😀
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Nipam Patel has been named the new Director of the
@MBLScience
in Woods Hole effective Sept 4, 2018. Congrats Nipam!
@___SDB___
@the_Node
@SICBtweets
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Postnatal (AFTER birth) development of the fat-tailed dunnart (Sminthopsis crassicaudata) marsupial in pouch by Cook et al. 2021.
#s
: days after birth.
@SocDevBio
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Here is the new Editorial Board for Differentiation recruited by Drs. Loydie Jerome-Majewska, Crystal Rogers, & Rosa Uribe. Great diversity!
@RogersLabUCD
@uribelabrice
@lamsciworld
@___SDB___
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Stage 22 bat 🦇 (Carollia perspicillata) embryo. Wing membranes are transparent in fresh specimens. Autopod length > zeugopod > stylopod. Thumbs are free & short. Toes are all same length (no big toe).
@___SDB___
@the_Node
@SICB_
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Craniofacial development 😀. Neural crest differentiation & morphogenesis variation between species.
@___SDB___
Asian house shrew (Suncus murinus). Elongated snouts compared to mouse.
@___SDB___
@SCGDB1
@the_Node
@SICB_
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Greater rhea (Rhea americana) development. Look at the neck elongation starting in Panel D!
@RogersLabUCD
@dsmithparedes
@AxelHNewton
@___SDB___
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Did you notice? The Session Chairs at
#2020SDB
were not only senior scientists but also junior faculty, postdocs, & grad students. This a great action to create an inclusive organization. This is 1 of many reasons why
@___SDB___
is my favorite science society.
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Undergrads checkout this well kept secret - Stowers Graduate School
@GSSIMR
. $37,000 stipend 😲, travel & conference allowance 😀, laptop computer 😆. No GRE. Seeks students with research experience. App deadline Dec 1, 2020.
#SACNAS2020
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Rare Rose-breasted Grosbeak gynandromorph (half male, half female) recently found Powdermill Nature Reserve in Rector, PA
@Powdermill_CMNH
. Photo credit: Annie Lindsay.
@JournalSxd
@___SDB___
@the_Node
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We (Dr. Bonnie Kircher) have been approved to start a brown anole colony
@MDAndersonNews
to study reproductive organ development. Generous help from
@dbmenke
.
@___SDB___
@the_Node
@SICB_
@EvoDevoPanAm
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Well, this is a brain teaser for a developmental biologist. How do you get eyes to develop in the oral cavity?
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A bit of a trek w/delayed flights & missed bus but I finally made it to Woods Hole for
@MBLScience
Embryology course to teach in mouse module w/Ondine Cleaver & Jenn Watts. I have 🐍🦎🐢🦇opossum & hamster embryos for students.
@SocDevBio
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Embryology Course
@MBLScience
began this evening with a reception for 24 students from around the world. Tatjana Piotrowski & Athula Wikramanayake are the course directors.
@NICHD_NIH
@SocDevBio
@NSF
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Postdoc position available in our lab to study reproductive organ development through a NIH T32 training grant. US citizen/perm resident. We study mouse but we use other vertebrate organisms.
@SSRepro
@___SDB___
@the_Node
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Neurula stage embryos but that are not Xenopus 🐸! These are developing paddlefish embryos from the Davis Lab - James Madison U, Harrisonburg, VA
@JMUCSM
. Not all fish embryos look like zebrafish.
@___SDB___
@the_Node
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Ironman Cozumel 2021. A challenging day. This was my 8th full course
@IRONMANtri
. We don’t always realize what we are truly capable of doing until we try. 🏊🏼♂️🚴🏽♂️🏃🏻♂️
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Australia lungfish (Neoceratodus forsteri) embryos. Lung is modified swim bladder for oxygen exchange & waste removal. 43 billion bp genome!
@___SDB___
@RogersLabUCD
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Bonnie Kircher
@holy_anole
receives Best Postdoc Presentation Award
#2023SDB
meeting for her wonderful talk on "Female reproductive organ anatomy and CRISPR gene editing in the brown anole" 🦎 Embryology 2016,
@FIRbees
@MBLScience
@MDAndersonNews
@NICHD_NIH
@NSF
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Ginny Papaioannou & I have been working on the 2nd edition of our book, Mouse Phenotypes: A Handbook of Mutation Analysis
@CSHLPress
- It should be out soon!
@SocDevBio
@GeneticsGSA
@ISTT_TG
@CSHLMouseCourse
@impc
@jacksonlab
@MRCMouseNetwork
@mgi_mouse
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Shaking
#xenopus
🐸 eggs in a dish shows they are pigmented on top but not pigmented on the bottom.
@___SDB___
@XenopusNXR
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Human embryo, sagittal fly through, high resolution episcopic microscopy (HREM).
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New paper from Jennifer McKey et al. (Capel Lab) combines iDISCO & CUBIC tissue clearing w/lightsheet microscopy for 3D imaging of adult mouse ovary. AMH (green) & HuC/D (red) show follicles & oocytes.
@BiolReprod
@SSRepro
@___SDB___
@the_Node
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Lampropeltis getula (King snake) embryos. Kim & Blackburn, 2015. Panel A shows the stage when the egg is laid! Note # of trunk coils increase as axis elongates.
@trinitycollege
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Beautiful chromatophores of striped pajama
#squid
🦑 (Sepioloidea lineolata) newly hatched at Embryology Course
@MBLScience
. Chromatophores are muscle-controlled pigment cells in cephalopod skin.
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