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1.  Phylogenetic profiling of bacterial community from two intimately located sites in Balramgari, North-East coast of India 
Indian Journal of Microbiology  2009;49(2):169-187.
Microbial communities in coastal subsurface sediments play an important role in biogeochemical cycles. In this study microbial communities in tidal subsurface sediments of Balramgari in the state of Orissa, India were investigated using a culture independent approach. Two 16S rDNA cloned libraries were prepared from the closely located (100 m along the coast) subsurface sediment samples. Library I sediment samples had higher organic carbon content but lower sand percentage in comparison to Library II. A total of 310 clone sequences were used for DOTUR analysis which revealed 51 unique phylotypes or operational taxonomic units (OTUs) for both libraries. The OTUs were affiliated with 13 major lineages of domain bacteria including Proteobacteria (α, β, δ and λ), Acidobacteria, Actinobacteria, Cyanobacteria, Chloroflexi, Firmicutes, Verrucomicrobia, Bacteroidetes, Gemmatimonadetes and TM7. We encountered few pathogenic bacteria such as Aeromonas hydrophila and Ochrobactrum intermedium, in sediment from Library I. ∫-LIBSHUFF comparison depicts that the two libraries were significantly different communities. Most of the OTUs from both libraries possessed ≥85% to <97% similarity to RDP database sequences depicting the putative presence of new species, genera and phylum. This work revealed the complex and unique bacterial diversity from coastal habitat of Balramgari and shows that, in coastal habitat a variability of physical and chemical parameter has a prominent impact on the microbial community structure.
PMCID: PMC3450138  PMID: 23100766
Ecosystem; Microbial diversity; Marine sediment; 16S rDNA
2.  Maternal Footprints of Southeast Asians in North India 
Human Heredity  2008;66(1):1-9.
We have analyzed 7,137 samples from 125 different caste, tribal and religious groups of India and 99 samples from three populations of Nepal for the length variation in the COII/tRNALys region of mtDNA. Samples showing length variation were subjected to detailed phylogenetic analysis based on HVS-I and informative coding region sequence variation. The overall frequencies of the 9-bp deletion and insertion variants in South Asia were 1.9 and 0.6%, respectively. We have also defined a novel deep-rooting haplogroup M43 and identified the rare haplogroup H14 in Indian populations carrying the 9-bp deletion by complete mtDNA sequencing. Moreover, we redefined haplogroup M6 and dissected it into two well-defined subclades. The presence of haplogroups F1 and B5a in Uttar Pradesh suggests minor maternal contribution from Southeast Asia to Northern India. The occurrence of haplogroup F1 in the Nepalese sample implies that Nepal might have served as a bridge for the flow of eastern lineages to India. The presence of R6 in the Nepalese, on the other hand, suggests that the gene flow between India and Nepal has been reciprocal.
PMCID: PMC2588665  PMID: 18223312
South Asia; 9bp indel; mtDNA; Haplogroup

Results 1-2 (2)