zacharoo

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  • March 15, 2016
  • 09:37 AM
  • 231 views

mtDNA sucks for inferring hominin relationships

by zacharoo in Lawn Chair Anthropology

Ancient DNA studies keep on delivering awesome findings about human evolution. Continuing this trend, Matthias Meyer and colleagues report today in Nature nuclear DNA (nDNA) sequenced from ~430,000 year old humans from the Sima de los Huesos (SH) site in Spain. SH is badass not only because the name translates as “pit of bones,” but also because […]... Read more »

Krause, J., Fu, Q., Good, J., Viola, B., Shunkov, M., Derevianko, A., & Pääbo, S. (2010) The complete mitochondrial DNA genome of an unknown hominin from southern Siberia. Nature, 464(7290), 894-897. DOI: 10.1038/nature08976  

Meyer, M., Fu, Q., Aximu-Petri, A., Glocke, I., Nickel, B., Arsuaga, J., Martínez, I., Gracia, A., de Castro, J., Carbonell, E.... (2013) A mitochondrial genome sequence of a hominin from Sima de los Huesos. Nature, 505(7483), 403-406. DOI: 10.1038/nature12788  

Meyer, M., Arsuaga, J., de Filippo, C., Nagel, S., Aximu-Petri, A., Nickel, B., Martínez, I., Gracia, A., de Castro, J., Carbonell, E.... (2016) Nuclear DNA sequences from the Middle Pleistocene Sima de los Huesos hominins. Nature. DOI: 10.1038/nature17405  

Reich, D., Green, R., Kircher, M., Krause, J., Patterson, N., Durand, E., Viola, B., Briggs, A., Stenzel, U., Johnson, P.... (2010) Genetic history of an archaic hominin group from Denisova Cave in Siberia. Nature, 468(7327), 1053-1060. DOI: 10.1038/nature09710  

  • February 12, 2016
  • 10:00 AM
  • 86 views

Bioanthro Lab Activity: Chimpanzee Developmental Osteology

by zacharoo in Lawn Chair Anthropology

We’ve just done the first lab activity in my Human Evo Devo course. My current university is young, and so we haven’t yet acquired good skeletal materials for teaching. Fortunately, the good people at Kyoto University’s Primate Research Institute have made a large, open access database of primate CT scans. For this first lab, students […]... Read more »

Jungers WL and Susman RL. (1984) Body size and skeletal allometry in African Apes. The Pygmy Chimpanzee: Evolutionary Biology and Behavior, 131-177. DOI: 10.1007/978-1-4757-0082-4_7  

  • January 13, 2016
  • 10:28 AM
  • 340 views

Did GDF6 “gene tweak” allow humans to become upright?

by zacharoo in Lawn Chair Anthropology

The short answer is, “Not really.” But as is often the case, the real story behind so many headlines last week is a bit more complicated. What are they talking about, Willis? These headlines, each saying something slightly different, are referring to a study by Indjeian and colleagues published in Cell.  Researchers identified a stretch of […]... Read more »

  • January 1, 2016
  • 10:11 AM
  • 331 views

#FossilFriday: 2015 Retrospecticus

by zacharoo in Lawn Chair Anthropology

Holy crap 2015 was a big year for fossils. And how fortuitous that 2016 begins on a Fossil Friday – let’s recap some of last year’s major discoveries. Homo naledi The Homo naledi sample is a paleoanthropologist’s dream – a new member of the genus Homo with a unique combination of traits, countless remains belonging to at least a dozen individuals from infant […]... Read more »

Haile-Selassie, Y., Gibert, L., Melillo, S., Ryan, T., Alene, M., Deino, A., Levin, N., Scott, G., & Saylor, B. (2015) New species from Ethiopia further expands Middle Pliocene hominin diversity. Nature, 521(7553), 483-488. DOI: 10.1038/nature14448  

Harmand, S., Lewis, J., Feibel, C., Lepre, C., Prat, S., Lenoble, A., Boës, X., Quinn, R., Brenet, M., Arroyo, A.... (2015) 3.3-million-year-old stone tools from Lomekwi 3, West Turkana, Kenya. Nature, 521(7552), 310-315. DOI: 10.1038/nature14464  

Thompson, J., McPherron, S., Bobe, R., Reed, D., Barr, W., Wynn, J., Marean, C., Geraads, D., & Alemseged, Z. (2015) Taphonomy of fossils from the hominin-bearing deposits at Dikika, Ethiopia. Journal of Human Evolution, 112-135. DOI: 10.1016/j.jhevol.2015.06.013  

Villmoare, B., Kimbel, W., Seyoum, C., Campisano, C., DiMaggio, E., Rowan, J., Braun, D., Arrowsmith, J., & Reed, K. (2015) Early Homo at 2.8 Ma from Ledi-Geraru, Afar, Ethiopia. Science, 347(6228), 1352-1355. DOI: 10.1126/science.aaa1343  

Ward, C., Feibel, C., Hammond, A., Leakey, L., Moffett, E., Plavcan, J., Skinner, M., Spoor, F., & Leakey, M. (2015) Associated ilium and femur from Koobi Fora, Kenya, and postcranial diversity in early Homo. Journal of Human Evolution, 48-67. DOI: 10.1016/j.jhevol.2015.01.005  

Chang, C., Kaifu, Y., Takai, M., Kono, R., Grün, R., Matsu’ura, S., Kinsley, L., & Lin, L. (2015) The first archaic Homo from Taiwan. Nature Communications, 6037. DOI: 10.1038/ncomms7037  

Hershkovitz, I., Marder, O., Ayalon, A., Bar-Matthews, M., Yasur, G., Boaretto, E., Caracuta, V., Alex, B., Frumkin, A., Goder-Goldberger, M.... (2015) Levantine cranium from Manot Cave (Israel) foreshadows the first European modern humans. Nature, 520(7546), 216-219. DOI: 10.1038/nature14134  

  • December 23, 2015
  • 12:00 PM
  • 194 views

Fragmentary fossils help reveal Neandertal skull growth

by zacharoo in Lawn Chair Anthropology

Frank Williams and I have a paper coming out shortly, comparing skull growth in Neandertals and humans. We use the resampling-based “grdif” method (see here) to compare an ontogenetic series of 20 non-adult and 20 adult Neandertals with a giant ontogenetic sample of humans. While Neandertal skull growth has been looked at before, the fragmentary […]... Read more »

Cofran Z. (2014) Mandibular development in Australopithecus robustus. American journal of physical anthropology, 154(3), 436-46. PMID: 24820665  

  • November 15, 2015
  • 12:58 PM
  • 333 views

Bioanthro lab activity: Hominin brain size

by zacharoo in Lawn Chair Anthropology

Last week in my Human Evolution class we looked at whether we could estimate hominin brain sizes, or endocranial volumes (ECV), based on just the length and width of the bony brain case. Students took these measurements on 3D surface scans… … and then plugged their data into equations relating these measurements to brain size […]... Read more »

  • November 8, 2015
  • 08:40 AM
  • 485 views

Osteology Everywhere: Bacon or first rib?

by zacharoo in Lawn Chair Anthropology

I went to a cafe today to eat breakfast and get some work done. It’s important to be properly nourished to ensure maximal productivity. But I was aghast to behold the food they placed before me: First of all, this is not a sufficient amount of bacon. Secondably, this bacon is a spitting image of a first rib: […]... Read more »

Lordkipanidze D, Jashashvili T, Vekua A, Ponce de León MS, Zollikofer CP, Rightmire GP, Pontzer H, Ferring R, Oms O, Tappen M.... (2007) Postcranial evidence from early Homo from Dmanisi, Georgia. Nature, 449(7160), 305-10. PMID: 17882214  

Schmid P, Churchill SE, Nalla S, Weissen E, Carlson KJ, de Ruiter DJ, & Berger LR. (2013) Mosaic morphology in the thorax of Australopithecus sediba. Science, 340(6129), 1234598. PMID: 23580537  

White TD, Asfaw B, Beyene Y, Haile-Selassie Y, Lovejoy CO, Suwa G, & WoldeGabriel G. (2009) Ardipithecus ramidus and the paleobiology of early hominids. Science, 326(5949), 75-86. PMID: 19810190  

  • November 7, 2015
  • 10:07 AM
  • 378 views

Bioanthro lab activity: Sexual dimorphism

by zacharoo in Lawn Chair Anthropology

A few weeks ago we examined sexual dimorphism – characteristic differences between males and females – in my Intro to Bioanthro class. Sexual dimorphism roughly correlates with aspects of social behavior in animals, and so we compared dimorphism in our class with what is seen in other primates. For the lab, we collected our body masses, heights, […]... Read more »

  • October 31, 2015
  • 04:56 AM
  • 359 views

Osteology everywhere: Halloween skull comet

by zacharoo in Lawn Chair Anthropology

It’s Halloween, a day when it’s socially acceptable for adults to play dress-up like children. Also, people celebrate things that are spooky-scary. So it’s perfect timing that NASA would announce that our planet will be visited by a dead comet, a celestial ghost hoping to haunt a planet full of the living. As NASA pointed out in […]... Read more »

  • October 30, 2015
  • 01:48 AM
  • 328 views

Bioanthro lab activity: What species is it?

by zacharoo in Lawn Chair Anthropology

We’re learning about the divergence between robust Australopithecus and early Homo 2.5-ish million years ago in my Human Evolution class this week. Because of this multiplicity of contemporaneous species, when scientists find new hominin fossils in Early Pleistocene sites, a preliminary question is, “What species is it?” To help my students learn how we know whether […]... Read more »

  • October 25, 2015
  • 01:28 PM
  • 366 views

Gracile & robust Australopithecus

by zacharoo in Lawn Chair Anthropology

Last week, I introduced my Human Evolution students to the “robust” australopithecines. It was a very delicate time, when we had to have a grown up, mature conversation about adult things. I reminded the students that they’re only human, but they must resist urges that seem only natural. No matter how much they want to, even if their friends are doing it, […]... Read more »

Asfaw B, White T, Lovejoy O, Latimer B, Simpson S, & Suwa G. (1999) Australopithecus garhi: a new species of early hominid from Ethiopia. Science (New York, N.Y.), 284(5414), 629-35. PMID: 10213683  

Domínguez-Rodrigo, M., Pickering, T., Baquedano, E., Mabulla, A., Mark, D., Musiba, C., Bunn, H., Uribelarrea, D., Smith, V., Diez-Martin, F.... (2013) First Partial Skeleton of a 1.34-Million-Year-Old Paranthropus boisei from Bed II, Olduvai Gorge, Tanzania. PLoS ONE, 8(12). DOI: 10.1371/journal.pone.0080347  

Haile-Selassie Y, Gibert L, Melillo SM, Ryan TM, Alene M, Deino A, Levin NE, Scott G, & Saylor BZ. (2015) New species from Ethiopia further expands Middle Pliocene hominin diversity. Nature, 521(7553), 483-8. PMID: 26017448  

Walker, A., Leakey, R., Harris, J., & Brown, F. (1986) 2.5-Myr Australopithecus boisei from west of Lake Turkana, Kenya. Nature, 322(6079), 517-522. DOI: 10.1038/322517a0  

  • September 13, 2015
  • 03:00 PM
  • 5,547 views

Homo naledi in a lawn chair

by zacharoo in Lawn Chair Anthropology

It is a great relief that Homo naledi, a most curious critter, was announced to the world on Thursday. I’ve been working on these fossils since May 2014, and it was really hard to keep my trap shut about it for over a year. I was in London for the ESHE conference last week when **it […]... Read more »

Berger LR, Hawks J, de Ruiter DJ, Churchill SE, Schmid P, Delezene LK, Kivell TL, Garvin HM, Williams SA, DeSilva JM.... (2015) Homo naledi, a new species of the genus Homo from the Dinaledi Chamber, South Africa. eLife. PMID: 26354291  

  • September 6, 2015
  • 06:00 AM
  • 411 views

A new year of bioanthro lab activities

by zacharoo in Lawn Chair Anthropology

One of my goals in teaching is to introduce students to how we come to know things in biological anthropology, and lab activities give students hands-on experience in using scientific approaches to address research questions. Biological anthropology (really, all biology) is about understanding variation, and I’ve created some labs for students to scrutinize biological variation within the classroom. In my Introduction class, the first aspect of […]... Read more »

  • August 23, 2015
  • 08:52 AM
  • 438 views

Easter Eggs from Raymond Dart

by zacharoo in Lawn Chair Anthropology

Some of the more colorful ideas and text in the anthropological literature are courtesy of Raymond Dart. In 1925, Dart identified the Taung fossil as a close relative of humans, and coined the scientific name, Australopithecus africanus. This was a pretty good idea, as Taung was the first in what is now a large collection of fossils attributed to this […]... Read more »

  • July 11, 2013
  • 02:10 PM
  • 537 views

Update: Brain growth in Homo erectus, and the age of the Mojokerto fossil

by zacharoo in Lawn Chair Anthropology

The Mojokerto calvaria. You're looking at the left side of the skull: the face would be to the left. Check it out in 3D here.A few months ago I posted an abridged version of the presentation I gave at this year's meetings of the American Association of Physical Anthropologists, about brain growth in Homo erectus. This study, co-authored with Jeremy DeSilva, adopts a novel approach (see "Methods" in that earlier post) to analyze the Mojokerto fossil (right). The specimen is the only H. ........ Read more »

  • June 19, 2013
  • 12:54 AM
  • 539 views

We like turtles ('s genomes)

by zacharoo in Lawn Chair Anthropology

June 2013, Volume 45 No 6 pp 579-714Jonathan the zombie isn't the only one who likes turtles. These heroes-in-a-half-shell adorn the cover of the current Nature Genetics, as two species of turtle have just joined the Genome Club (Wang et al. 2013; paper's free!).This definitely not one of those genome sequencing studies alluded to recently by John Hawks, that's "too boring for journals." Wang and colleagues didn't just sequence the genomes of soft-shell and green sea tur........ Read more »

  • May 12, 2013
  • 05:01 AM
  • 529 views

Online skeletal and dental datasets (links links links!)

by zacharoo in Lawn Chair Anthropology

Jean Jacques Hublin has a commentary [1] in the current issue of Nature, about making fossils available for scanning, digital replication, and ultimately hopefully open dissemination. As Hublin points out, it's a bit ridiculous that a fossil is a rare enough thing as it is, but even after their discovery, fossils "can become unreachable relics once they are in storage." Fortunately, Hublin goes on to point to online collections that are available to anyone interested. Somewhat ironically, t........ Read more »

  • May 11, 2013
  • 09:43 AM
  • 534 views

Arm and leg modelling

by zacharoo in Lawn Chair Anthropology

No, I'm not looking for people with lithe limbs to be photographed for money. Much more sexily, I'm referring to a recent paper (Pietak et al., 2013) that's found that the relative length of the segments of human limbs can be modeled with a log-periodic function:Figure 2 from Pietak et al. 2013. Human within-limb proportions are such that the length of each segment (e.g., H1-6) of a limb, from  fingertip to shoulder (A) and to to hip (B), can be predicted by a logarithmic periodic function&........ Read more »

  • April 16, 2013
  • 03:05 PM
  • 512 views

Pre-publication: Brain growth in Homo erectus (plus free code!)

by zacharoo in Lawn Chair Anthropology

The annual meetings of the American Association of Physical Anthropologists were going on all last week, and I gave my first talk before the Association. The talk focused on using resampling methods and the abysmal human fossil record to assess whether human-like brain size growth rates were present in our >1 mya ancestor Homo erectus. This is something I've actually been sitting on for a while, but wanted to wait til the talk to post for all to see. Here's a brief version:Background: Hu........ Read more »

Coqueugniot H, Hublin JJ, Veillon F, Houët F, & Jacob T. (2004) Early brain growth in Homo erectus and implications for cognitive ability. Nature, 431(7006), 299-302. PMID: 15372030  

Herndon JG, Tigges J, Anderson DC, Klumpp SA, & McClure HM. (1999) Brain weight throughout the life span of the chimpanzee. The Journal of comparative neurology, 409(4), 567-72. PMID: 10376740  

Sakai T, Matsui M, Mikami A, Malkova L, Hamada Y, Tomonaga M, Suzuki J, Tanaka M, Miyabe-Nishiwaki T, Makishima H.... (2013) Developmental patterns of chimpanzee cerebral tissues provide important clues for understanding the remarkable enlargement of the human brain. Proceedings. Biological sciences / The Royal Society, 280(1753), 20122398. PMID: 23256194  

  • February 28, 2013
  • 12:19 PM
  • 603 views

Go home, RNA, you're drunk

by zacharoo in Lawn Chair Anthropology

(Alternate title: "circRNA censors the RNA censors?")When I was a kid, RNA played second fiddle to DNA. RNA was a mere intermediary between the 'book of life' (DNA) and the stuff the book coded for (proteins). But in the years since, RNA has shown itself to be a key player in the regulation of gene expression (shut up, DNA!). We now know of lots of kinds of non-coding RNA (ncRNA) that do lots of important things in cells, such as maintaining genomic integrity in the germ line (piRNA) a........ Read more »

Hansen, T., Jensen, T., Clausen, B., Bramsen, J., Finsen, B., Damgaard, C., & Kjems, J. (2013) Natural RNA circles function as efficient microRNA sponges. Nature. DOI: 10.1038/nature11993  

Memczak, S., Jens, M., Elefsinioti, A., Torti, F., Krueger, J., Rybak, A., Maier, L., Mackowiak, S., Gregersen, L., Munschauer, M.... (2013) Circular RNAs are a large class of animal RNAs with regulatory potency. Nature. DOI: 10.1038/nature11928  

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