Ch. 14 - Analysis of Gene Function via Forward Genetics and Reverse Genetics

Sanders - Genetic Analysis: An Integrated Approach 3rd Edition

Sanders3rd EditionGenetic Analysis: An Integrated ApproachISBN: 9780135564172Non è quello che usi tu?Cambia libro di testo

Sanders 3rd Edition

Ch. 14 - Analysis of Gene Function via Forward Genetics and Reverse Genetics

Problema 29

Capitolo 14, Problema 29

Mutations in the Drosophila Ultrabithorax (Ubx) gene result in wings developing from two thoracic segments, rather than just one as in wild-type flies. In the mouse genome there are two Ubx orthologs . How would you determine whether the two mouse genes have distinct or redundant functions?

Guida verificata passo dopo passo

Step 1: Begin by identifying the two mouse Ubx orthologs in the genome. Use sequence alignment tools, such as BLAST, to confirm their similarity to the Drosophila Ubx gene and ensure they are true orthologs.

Step 2: Design experiments to study the expression patterns of the two mouse Ubx orthologs. Use techniques like RNA in situ hybridization or quantitative PCR to determine where and when each gene is expressed during development.

Step 3: Create knockout mouse models for each of the two Ubx orthologs individually. This involves using techniques like CRISPR-Cas9 to disrupt the function of each gene and observe the phenotypic effects in the mice.

Step 4: Generate double knockout mouse models where both Ubx orthologs are disrupted simultaneously. Compare the phenotypes of the double knockout mice to those of the single knockouts to assess whether the genes have redundant functions.

Step 5: Analyze the phenotypic data from the single and double knockout experiments. If the double knockout results in a more severe phenotype than either single knockout, the genes likely have redundant functions. If the phenotypes are distinct, the genes may have distinct roles.

Risposta video verificata per un problema simile:

Questa soluzione video è stata consigliata dai nostri tutor come utile per risolvere questo problema.

Durata del video:

Concetti chiave

Ecco i concetti essenziali che devi comprendere per rispondere correttamente alla domanda.

Gene Orthologs

Gene orthologs are genes in different species that evolved from a common ancestral gene through speciation. They typically retain the same function across species, making them crucial for comparative studies in genetics. Understanding orthologs helps researchers infer the evolutionary relationships and functional similarities between genes in different organisms, such as the Ubx gene in Drosophila and its counterparts in mice.

Video consigliato:

Percorso guidato

09:09

Mapping Genes

Gene Function Analysis

Gene function analysis involves experimental approaches to determine the roles of specific genes in an organism. Techniques such as gene knockout, where a gene is deliberately disrupted, and gene overexpression can reveal whether genes have distinct or redundant functions. By observing phenotypic changes in organisms lacking one or both genes, researchers can assess the functional contributions of each gene.

Video consigliato:

Percorso guidato

08:26

Functional Genomics

Phenotypic Analysis

Phenotypic analysis refers to the study of observable traits or characteristics resulting from the interaction of an organism's genotype with its environment. In the context of the Ubx gene, examining the physical traits of mice with mutations in the Ubx orthologs can provide insights into whether these genes perform unique roles or compensate for each other. This analysis is essential for understanding the functional dynamics of gene interactions.

Video consigliato:

Percorso guidato

02:48

Chi Square Analysis

Pratica correlata

Domanda del libro di testo

Most organisms display a circadian rhythm, a cycling of biological processes that is roughly synchronized with day length (e.g., jet lag occurs in humans when rapid movement between time zones causes established circadian rhythms to be out of synch with daylight hours). In Drosophila, pupae eclose (emerge as adults after metamorphosis) at dawn.

In each case, how would you clone the genes you identified by mutation?

542

views

Domanda del libro di testo

In most plants, such as Arabidopsis, genes whose encoded products have roles related to photosynthesis have expression patterns that vary in a circadian manner. Using this knowledge, how would you screen for Arabidopsis mutants that have an impaired circadian rhythm?

581

views

Domanda del libro di testo

Through a forward genetics screen in Arabidopsis you have identified a mutation that results in leaves curling upward, rather than being flat as in wild type. You have cloned the corresponding gene and note that it is a member of a small gene family composed of three additional members in Arabidopsis. How will you determine if the other three members of the gene family have similar or distinct functions as compared with the gene you first identified?

427

views

Domanda del libro di testo

Using this knowledge, how would you screen for Drosophila mutants that have an impaired circadian rhythm?

625

views

Domanda del libro di testo

The CRISPR–Cas9 complex directs the Cas9 endonuclease to a specific genomic locus. If the endonuclease domain is inactivated and replaced with a transcriptional activator (or repressor) domain, what would be the functional consequence of directing such a complex to a specific chromosomal location?

662

views

Domanda del libro di testo

How would you edit a specific nucleotide in a genome?

647

views