Correct option is B
Option B-ii:
AKT, Ras, Myc, Her2 with PTEN, E-cadherin, APC, Smad4
This combination makes sense because:AKT, Ras, Myc, and Her2 are genes commonly upregulated in cancer. These genes contribute to tumorigenesis and increased cell growth and survival.
On the other hand, the inactivated genes PTEN, E-cadherin, APC, and Smad4 are tumor suppressors. Mutations, deletions, or recombination of these genes lead to their inactivation, contributing to cancer progression.
Specifically, PTEN is a tumor suppressor gene that is often deleted or mutated in cancer; E-cadherin is involved in cell adhesion, and its loss contributes to tumor metastasis; APC and Smad4 are also tumor suppressor genes often inactivated in various cancers.
Why Option B-ii is correct:
AKT, Ras, Myc, and Her2 are often overexpressed or amplified in various cancers, driving cell growth and survival.
PTEN, E-cadherin, APC, and Smad4 are inactivated by mutations, deletions, or recombination events, making this combination the most plausible for cancer-critical genes.
Other Options:
Option A-i:
E-cadherin, Smad4, Ras, Myc with PTEN, APC, AKT, Her2
This combination does not fit because E-cadherin, Smad4, Ras, and Myc are not typically all upregulated in the same tumor. Furthermore, the response of PTEN, APC, and AKT being inactivated by mutations is unlikely to match this combination.
Option C-iii:
AKT, Ras, Myc, Smad4 with PTEN, E-cadherin, APC, Her2
Smad4 is typically a tumor suppressor gene, not one that is overexpressed in tumors. Therefore, this option doesn’t make sense in the context of gene deregulation.
Option D-iv:
E-cadherin, AKT, Ras, Myc with Her2, PTEN, APC, Smad4
This combination is unlikely because E-cadherin is usually downregulated in cancer, while AKT, Ras, and Myc are typically upregulated. Therefore, this is not a good match for gene deregulation leading to cancer.
