Hossein Mohammadi

Extended Abstract Background: The identification of selection targeted genomic regions is one of the main aims of biological research. Domestication and selection have significantly changed the behavioral and phenotypic traits in modern domestic animals. The selection of animals by humans has left detectable signatures on the genome of modern cattle. ...

Domestication and selection significantly changed phenotypic traits in modern domestic animals. To identify the genomic regions associated with prolificacy in this study, 837 ewes from three Iranian indigenous sheep breeds, consisting of Baluchi, Lori-Bakhtiari, and Zandi uniparous breeds, and one Greek highly prolific dairy sheep, namely Chios, were genotyped using OvineSNP50K arrays. Statistical tests were then performed using different and complementary methods based on either site frequency (F_ST) and haplotype (hapFLK) between populations, followed by a pathway analysis of the genes contained in the selected regions. The results revealed that for the top 0.01 percentile of the obtained F_ST values, 16 genomic regions on chromosomes 2, 3, 4, 7, 8, 9, 13, 14, 16, 18, 19, and 20, and for hapFLK values, 3 regions located on chromosomes 3, 7, and 13, were under selection. A bioinformatic analysis of these genomic regions showed that these loci overlapped with potential candidate genes associated with prolificacy in sheep including GNAQ, COL5A2, COL3A1, HECW1, FBN1, COMMD3, RYR1, CCL28, SERPINA14, and HSPA2. These regions also overlapped with some quantitative trait loci (QTLs) linked to prolificacy traits, milk yield, and body weight. These findings suggest that future research could further link these genomic regions to prolificacy traits in sheep.

Extended Abstract Background: Angel wing is a developmental wing deformity that can influence breeding and reproduction in the commercial duck industry. Therefore, genetic diversity studies and detection of the genomic region related to angel wings in duck populations are essential. In this regard, powerful tools, such as next-generation sequencing technology, have ...

Extended Abstract Introduction and Objectives: Genetic architecture of sheep reproduction is increasingly gaining scientific interest due to the major impact on sheep production systems. The present study aimed to conduct for identifying the loci associated with total number of progeny born and first lambing age in highly prolific Chios sheep ...

هدف: غشای اسپرم سرشار از اسیدهای چرب غیراشباع است که نسبت به آسیب به‫وجود آمده توسط ROS در نتیجه پراکسیداسیون چربی­ها بسیار حساس می­باشد. استفاده از آنتی‌اکسیدان مناسب در رقیق­کننده­های منی می­تواند سطح ROS را کاهش دهد. پژوهش حاضر در جهت مقایسه غلظت‌های مختلف آنتی‌اکسیدان روتین در فرآیند سردسازی اسپرم قوچ بود.مواد و روش‌ها: بعد از فراوری اسپرم اپی‫دیدمی پارامترهای جنبایی (CASA)، یکپارچگی غشا (HOST)، زنده‌مانی، پراکسیداسیون لیپیدی (MDA) در زمان‌های 0، 24 و 48 ساعت بعد از سردسازی مورد ارزیابی قرار گرفتند. نتایج: داده‌های حاصل از این آزمایش نشان دهنده آن است که در زمان 24 و 48 ساعت بعد از سردسازی افزون آنتی‌اکسیدان روتین در غلظت 75/0 و 1 میلی مولار باعث افزایش معنی‌دار جنبایی کل، جنبایی پیش‌رونده و سرعت در مسیر مستقیم می‌شود. نتایج پژوهش حاضر نشان دهنده آن است که تیمارهای آزمایشی در زمان صفر، 24 و 48 ساعت بعد از سردسازی تاثیری روی VAP، VCL و STR ندارد. نتایج حاصل از این آزمایش نشان دهنده آن است که در زمان 24 و 48 ساعت بعد از سردسازی افزون آنتی‌اکسیدان روتین در غلظت 75/0 و 1 میلی مولار باعث افزایش معنی‌دار زنده­مانی، یکپارچگی غشا می‌شوند. همچنین نتایج نشان دهنده‫ی آن...

The objective of this study was to uncover genomic regions explaining a substantial proportion of the genetic variance in milk production traits and somatic cell score in a Valle del Belice dairy sheep. Weighted single-step genome-wide association studies (WssGWAS) were conducted for milk yield (MY), fat yield (FY), fat percentage (FAT%), protein yield (PY), protein percentage (PROT%), and somatic cell score (SCS). In addition, our aim was also to identify candidate genes within genomic regions that explained the highest proportions of genetic variance. Overall, the full pedigree consists of 5534 animals, of which 1813 ewes had milk data (15,008 records), and 481 ewes were genotyped with a 50 K single nucleotide polymorphism (SNP) array. The effects of markers and the genomic estimated breeding values (GEBV) of the animals were obtained by five iterations of WssGBLUP. We considered the top 10 genomic regions in terms of their explained genomic variants as candidate window regions for each trait. The results showed that top ranked genomic windows (1 Mb windows) explained 3.49, 4.04, 5.37, 4.09, 3.80, and 5.24% of the genetic variances for MY, FY, FAT%, PY, PROT%, and total SCS, respectively. Among the candidate genes found, some known associations were confirmed, while several novel candidate genes were also revealed, including PPARGC1A, LYPLA1, LEP, and MYH9 for MY; CACNA1C, PTPN1, ROBO2, CHRM3, and ERCC6 for FY and FAT%; PCSK5 and ANGPT1 for PY and PROT%; and IL26, IFNG, PEX26, NEGR1, LAP3, and MED28 for SCS. These findings increase our understanding of the genetic architecture of six examined traits and provide guidance for subsequent genetic improvement through genome selection.