New paper: What do the colours of a female damselfly say?

Shantanu’s work on female colour variation in the widespread, tiny damselfly Agriocnemis pygmaea is now out! Females of this damselfly (seen at the campus pond) come in two colors: red and blue, as well as a bunch of intermediate forms. We wondered whether these colours represent allelic forms, or ontogenic (age-related) change. From laboratory studies and field observations at the pond, Shantanu found that the colour variation is ontogenic. Females start off red, and as they mature and develop eggs, they begin to look blue, resembling males. The colour change coincides with males becoming more interested in mating with them. Read the paper here, or the NCBS news article. Photograph: Shantanu Joshi.

Battling COVID-19 misinformation

As the pandemic unfolded (and continues) in India, some of us from the lab joined the ISRC, a motley group of scientists across India who banded together to address various issues relevant to COVID-19. The group has created a large repository of accurate scientific information about the pandemic; busted hoaxes; organized a number of formal and informal discussions; and produced population science articles to inform lay people. Importantly, all these resources are available in multiple regional languages. To find more, do visit the ISRC website, YouTube channel, or Facebook.

New paper: Mistranslation can be good!

Our work on ‘useful’ mistakes in bacteria (E. coli) is finally out! Laasya and Parth found that making rebel proteins not encoded by our DNA can be a good thing. In cells that frequently make mistakes, the accumulated ‘junk’ proteins end up triggering a high alert situation. This allows the cells to better deal with various external assaults (like increased temperature, damage to DNA and so on). When everything is normal this isn’t a big deal; in fact the junk makes cells mildly sick.  Under stress though, the high alert and error prone cells get the upper hand, leaving behind the more accurate (but less prepared) regular cells. For more: read the paper, and an NCBS news article. And, enjoy this summary cartoon from Pranjal Gupta that was featured on the journal cover!

New paper: Methylobacterium distribution shaped by host rice

Bacteria are so small and so ubiquitous that it seems like they should be found everywhere. But recent work shows that much like animals and plants, most bacteria have discrete distributions. We asked: does host association shape bacterial distribution in nature? In Pratibha’s first paper from the lab, we describe how bacteria from the genus Methylobacterium are distributed across nearly 40 different rice landraces from Arunachal Pradesh and Manipur. Collaborating with the labs of Shivaprasad and Radhika at NCBS, we found that bacterial carbon-use phenotypes are largely shaped by the landrace they inhabit. Suprisingly, sugar availability on rice leaves does not correlate with the carbon-use phenotypes, leaving us with many new questions. For more, read the paper. Meanwhile, enjoy this lovely illustration by Pranjal Gupta!

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New paper: Butterflies don’t need bacteria for survival and development

Kruttika’s work testing the impact of butterfly caterpillar microbiomes on growth and survival is published! This was a major collaborative effort with Krushnamegh Kunte, and very new kind of work for our lab. The results were puzzling because unlike patterns from other insects, butterflies seem to be just fine without their bacteria. But in conjunction with Rittik and Ashwin’s recent results with dragonflies, it seems that we’ve uncovered one end of the spectrum of host-microbe interactions. The end that spells “meh!” rather than “I need you”. Here’s a cartoon summary of the work by Kruttika and Shreya. Also read a lay summary here; or read the paper for more details!

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New paper: The little inhabitants of mighty dragon(flies)

Rittik Deb and Ashwin Nair’s paper on the gut bacterial communities of dragonflies is out! We sampled several species of dragonflies from different locations in India, and found that gut bacterial communities varied across host species, location, and season. For some of the dragonflies, we were also able to analyse gut contents, and found that these “generalist predators” eat quite different meals that probably end up introducing distinct bacteria in their guts. So, unlike in most other insects, dragonfly gut bacterial communities seem to be transient and are neutrally assembled (rather than host-selected). Read the paper for more details. Meanwhile, enjoy this beautiful summary of the paper by Pranjal Gupta!

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Announcing the 2020 ICTS School on Population Genetics and Evolution

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Kavita Jain and I are pleased to announce the fourth edition of the Bangalore School on Population genetics and Evolution. As always, we have an exciting speaker lineup, and we look forward to a group of enthusiastic participants. We invite applications from PhD students and postdocs (and exceptional MSc students) from biology, computer science, physics, or mathematics backgrounds. The key requirement is a strong interest in population genetics and/or evolutionary biology. Applications close 1 Oct 2019. For more information, see the school website.