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3. Genome wide association study for growth in Pakistani dromedary camels using genotyping-by-sequencing

Author

Sabahat, Sajida, Nadeem, Asif, Brauning, Rudiger, Thomson, Peter, and Khatkar, Mehar

Subjects
General Veterinary, Physiology, Genetics, Animal Science and Zoology, Animal reproduction and breeding, Food Science
Abstract

Objective: Growth performance and growth-related traits have a crucial role in livestock due to their influence on productivity. This genome-wide association study (GWAS) in Pakistani dromedary camels was conducted to identify single nucleotide polymorphisms (SNPs) associated with growth at specific camel ages, and for selected SNPs, to investigate in detail how their effects change with increasing camel age. This is the first GWAS conducted on dromedary camels in this region. Methods: Two Pakistani breeds, Marecha and Lassi, were selected for this study. A genotypingby-sequencing method was used, and a total of 65,644 SNPs were identified. For GWAS, weight records data with several body weight traits, namely, birthweight, weaning weight, and weights of camels at 1, 2, 4, and 6 years of age were analysed by using model-based growth curve analysis. Age-specific weight data were analysed with a linear mixed model that included fixed effects of SNP genotype as well as sex. Results: Based on the q-value method for false discovery control, for Marecha camels, five SNPs at qqqqConclusion: These results will help to better understand the genetic architecture of growth including how these genes are expressed at different phases of their life. This will serve to lay the foundations for applied breeding programs of camels by allowing the genetic selection of superior animals.

Published
2023
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6. Amino Acid Substitutions in Growth Hormone and Growth Hormone Receptor Genes Mutants in Camelus dromedarius.

Author

Sabahat, Sajida, Nadeem, Asif, Javed, Maryam, Zahoor, Muhammad Yasir, Nabeel, Shahid, and Hashmi, Abu Saeed

Abstract

The identification of genetic polymorphisms in genes enable us to estimate biological similarities and obtain a better perspective of quantitative traits that play key roles in development and regulating growth. The present study was conducted to characterize genetic variability in the growth hormone (GH) and growth hormone receptor (GHR) of Camelus dromedarius. GH is secreted and synthesized from somatotroph cells of the anterior pituitary lobe and plays significant role in growth, development, metabolism, lactation, and reproduction. Growth hormone interact with GHRs and influence on metabolism and growth. Changes in GHR concentration affect signalling pathways, binding capacity and alters activity of GH. Therefore, the GH and GHR genes are considered important candidate genes. DNA samples of Marecha camel were collected from the Camel Breeding and Research Station at Rakhmani Bhakar, Pakistan. Two significant polymorphic sites were identified in GH gene and three in GHR gene. Out of these, T1720A polymorphism in GH and A211927G polymorphism in GHR genes changed the amino acid from leucine to histidine and methionine to valine, respectively. These polymorphic results suggest that Marecha camel, a major breed in Pakistan, has genetic variability in the GH and GHR genes. These results suggest that Marecha camel has genetic variability in growth-related genes and identified polymorphisms may be helpful for association studies and future selection programs. [ABSTRACT FROM AUTHOR]

Published
2020
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