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پویش کل ژنومی و تجزیه و تحلیل غنیسازی مجموعههای ژنی مرتبط با صفات پشم در گوسفندان نژاد زندی | ||
| تولیدات دامی | ||
| مقاله 1، دوره 25، شماره 3، مهر 1402، صفحه 241-254 اصل مقاله (2.44 M) | ||
| نوع مقاله: مقاله پژوهشی | ||
| شناسه دیجیتال (DOI): 10.22059/jap.2023.357327.623738 | ||
| نویسندگان | ||
| حسین محمدی* 1؛ حسین مرادی شهربابک2؛ محمد شمس الهی3 | ||
| 1استادیار گروه علوم دامی، دانشکده کشاورزی و منابع طبیعی، دانشگاه اراک، اراک، ایران. | ||
| 2استادیار گروه علوم دامی، پردیس کشاورزی و منابع طبیعی کرج، دانشگاه تهران. کرج، ایران. | ||
| 3استادیار گروه علوم دامی، دانشکده کشاورزی، دانشگاه ایلام، ایلام، ایران. | ||
| چکیده | ||
| هدف پژوهش حاضر، شناسایی مناطق ژنومی و ژنهای کاندیدای مرتبط با صفات پشم از طریق پویش ژنومی برپایه آنالیز مسیر در گوسفند نژاد زندی بود. بدین منظور 96 رأس گوسفند با استفاده از آرایههای 50K تعیین ژنوتیپ شدند و برای هر دام رکوردهای فنوتیپی شامل میانگین قطر الیاف، ضریب تغییرات قطر الیاف، نسبت الیافی که مساوی یا بیش‌تر از 30 میکرومتر قطر الیاف، طول استاپل، نسبت کمپ و نسبت مو در الیاف اندازه‌گیری شد. ارزیابی پویش ژنومی برای صفات در نرمافزار GEMMA انجام شد، سپس با استفاده از بسته نرمافزاری biomaRt2 ژنهای معنیداری که در داخل و یا 50 کیلوباز بالا و پایین‌دست نشانگرهای معنیدار قرار داشتند، شناسایی گردید. در نهایت، آنالیز غنیسازی مجموعههای ژنی به‌وسیله برنامه برخط KOBAS با هدف شناسایی عملکرد بیولوژیکی ژنهای کاندیدا انجام شد. در این پژوهش ژنهای مرتبط با صفات قطر الیاف CEP290)، PRKCZ، TMTC3، RHPN2 و TNFSF4)، طول استاپل (NLGN1، SPHKAP و PLCE1) و نسبت کمپ و مو (FAT1 و PIK3R4) شناسایی شدند. در تحلیل غنیسازی مجموعههای ژنی، تعداد 21 مسیر با صفات پشم شناسایی شدند. از بین مسیرهای زیستی شناسایی‌شده نقش مهمی در رشد و توسعه فولیکولهای مو، تولید کراتینوسیتها، رشد و توسعه اپیدرمال، سنتز آنزیمهای تروئونین کینازها و مسیر سیگنالدهی Wntداشتند. با توجه به تأیید نتایج قبلی و شناسایی ژنهای کاندیدای جدید با عملکرد مولکولی مرتبط با صفات الیاف پشم، نتایج این پژوهش میتواند در درک سازوکار ژنتیکی کنترل کننده صفات پشم مورد استفاده قرار گیرد و در انتخاب ژنتیکی گوسفند از طریق کیفیت بالاتر پشم مفید باشد. | ||
| کلیدواژه‌ها | ||
| آنالیز مسیر؛ پویش ژنومی؛ ژن کاندیدا؛ کیفیت الیاف؛ گوسفند زندی | ||
| عنوان مقاله [English] | ||
| Genome wide association study based on pathway analysis relate to wool traits in Zandi sheep breed | ||
| نویسندگان [English] | ||
| Hossein Mohammadi1؛ Hossein Moradi Shahrebabak2؛ mohammad shamsollahi3 | ||
| 1Assistant Professor, Department of Animal Sciences, Faculty of Agriculture and Natural Resources, Arak University, Arak, Iran. | ||
| 2Assistant Professor, Department of Animal Sciences, University College of Agriculture and Natural Resources, University of Tehran. Karaj.Iran | ||
| 3Assistant Professor, Department of Animal Sciences, Faculty of Agriculture, University of Ilam. Ilam, Iran. | ||
| چکیده [English] | ||
| Introduction: Identifying of genes with large effects on economically important traits, has been one of the important goal to sheep breeding. Over recent years, advances in DNA-based marker technology have made it possible to identify genomic regions or quantitative trait loci (QTLs) underlying complex traits, such as fleece traits, in sheep. The present study aimed to conduct a genome wide association studies (GWAS) based on gene-set enrichment analysis for identifying the loci associated with wool traits in native Zandi sheep using the 50K arrays. Material and Methods: A total of 300 Iranian Zandi sheep used in this study came from the Zandi sheep breeding station. Wool sampling coincided with the maximum wool growth prior to the shearing of wool. In order to facilitate sampling, sheep were restrained in a lateral position and true wool from the left mid-side site was cut from a 5×5 cm2 close to the skin using regular scissors. Each sample was separately packaged and labeled with ear tag number of the sheep. We measured and recorded four wool production traits: staple length (SL), mean fiber diameter (MFD), fiber diameter coefficient of variation (CVFD), and the proportion of fiber that are equal or more than 30 µm (PR), kemp percentage (KEMP%) and outer coat fiber (OCF) were measured. Genomic DNA extraction from sheep blood was performed by the applying a modified salting out protocol and genotyping of the Sheep SNPChip 50 K SNP Bead from Illumina Inc. The gene set analysis consists basically in three different steps: the assignment of SNPs to genes, the assignment of genes to functional categories, and finally the association analysis between each functional category and the phenotype of interest. Genome wide association study was performed with wool traits using GEMMA software. Using the biomaRt2 R package, the SNP were assigned to genes if they were within the genomic sequence of the gene or within a flanking region of 50 kb up- and downstream of the gene and bioinformatics analysis was implemented to identify the biological pathways performed in GO, KEEG, DAVID and PANTHER databases. The GO database designates biological descriptors to genes based on attributes of their encoded products and it is further partitioned into 3 components: biological process, molecular function, and cellular component. The KEGG pathway database contains metabolic and regulatory pathways, representing the actual knowledge on molecular interactions and reaction networks. Finally, a Fisher’s exact test was performed to test for overrepresentation of the significant genes for each gene-set. In the next step, a bioinformatics analysis was implemented to identify the biological pathways performed in GeneCards databases. Result and Discussion: The result from genomic control showed weak population stratification with for woot traits among Zandi sheep population. We identified different sets of candidate genes related to wool traits including: CEP290, PRKCZ, TMTC3, RHPN2, TNFSF4, NLGN1, SPHKAP, PLCE1, FAT1 and PIK3R4 in Zandi sheep. Some of the found genes, are consistent with some of the previous studies related to reproductive traits. According to pathway analysis, 21 pathways from gene ontology and biological pathways were associated with the wool traits (P˂0.05). Some of the genes were found are consistent with some prior studies and to be involved biological pathways related to hair follicle development, keratinocytes differentiation, synthesizes an enzyme of threonine kinases, development of epidermal and Wnt signaling pathway. Conclusion: In total, this study supported previous results from GWAS of wool traits, also revealed additional regions in the sheep genome associated with these economically important traits. These findings could potentially be useful for genetic selection in the breeding programs and can be used to understand the genetic mechanism controlling this trait. | ||
| کلیدواژه‌ها [English] | ||
| Candidate gene, Genome Scan, Pathway analysis, Wool quality, Zandi Sheep | ||
| مراجع | ||
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