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Point and Frameshift Mutations

Point and Frameshift Mutations

Point mutations are genetic alterations involving the change of a single nucleotide base pair in DNA. Depending on how the alteration affects protein synthesis, they can lead to various consequences.Point mutations fall into the following types:Silent mutations occur when a nucleotide change does not alter the amino acid sequence due to the redundancy of the genetic code. For instance, changing ACC to ACA still encodes threonine, leaving the protein function unaffected. This occurs because...

Mutations

Mutations

Mutations are changes in the sequence of DNA. These changes can occur spontaneously or they can be induced by exposure to environmental factors. Mutations can be characterized in a number of different ways: whether and how they alter the amino acid sequence of the protein, whether they occur over a small or large area of DNA, and whether they occur in somatic cells or germline cells.
Chromosomal Alterations Are Large-Scale Mutations
While point mutations are changes in a single nucleotide in...

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Spontaneous and Induced Mutations

Spontaneous and Induced Mutations

Spontaneous mutations arise infrequently during DNA replication due to errors in the process. A key factor behind these errors is tautomeric shifts in nitrogenous bases, where bases transition from keto to enol forms or amino to imino forms. This shift can alter base-pairing rules, leading to mutations. Additionally, reactive oxygen species (ROS) arising from aerobic metabolism can damage DNA, resulting in depurination (loss of a purine base) or depyrimidination (loss of a pyrimidine base).

Alternative RNA Splicing

Alternative RNA Splicing

Alternative RNA splicing is the regulated splicing of exons and introns to produce different mature mRNAs from a single pre-mRNA. Unlike in constitutive splicing where a single gene produces a single type of mRNA, alternative splicing allows an organism to produce multiple proteins from a single gene and plays an important role in protein diversity.
There are five types of alternative RNA splicing that vary in the ways the pre-mRNA segments are removed or retained in the mature mRNA. The first...

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In Vivo Functional Study of Disease-associated Rare Human Variants Using Drosophila

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A novel disease-causing mutation in AVPR2: Q96H.

Mathieu Lemaire¹, David Chitayat, Denis F Geary

¹Division of Nephrology , The Hospital for Sick Children.

|May 8, 2015

Summary

A novel mutation (Q96H) in the arginine vasopressin receptor-2 (AVPR2) gene caused nephrogenic diabetes insipidus (NDI) in an infant. This discovery highlights the critical role of this specific gene region in kidney function.

Keywords:

AVPR2 DDAVP nephrogenic diabetes insipidus vasopressin

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Engineering Oncogenic Heterozygous Gain-of-Function Mutations in Human Hematopoietic Stem and Progenitor Cells

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Published on: March 10, 2023

Area of Science:

Genetics
Molecular Biology
Endocrinology

Background:

Nephrogenic diabetes insipidus (NDI) is a condition characterized by the kidneys' inability to respond to arginine vasopressin (AVP).
Genetic mutations in the arginine vasopressin receptor-2 (AVPR2) gene are a common cause of X-linked NDI.
Understanding the molecular basis of AVPR2 dysfunction is crucial for diagnosing and potentially treating NDI.

Purpose of the Study:

To identify the genetic cause of NDI in a 4-month-old male infant.
To characterize a novel mutation in the AVPR2 gene and its functional implications.
To investigate the role of the conserved Q96 residue in AVPR2 function.

Main Methods:

Genetic testing (sequencing) of the AVPR2 gene.
Protein sequence comparison across AVPR subtypes.
Molecular modeling of the AVPR1 receptor.
Analysis of mutation location relative to known disease-causing sites.

Main Results:

A novel X-linked mutation, Q96H, was identified in the AVPR2 gene of the infant and his mother.
The Q96 residue is located within a highly conserved motif in the AVPR2 protein.
Molecular modeling suggests the equivalent residue in AVPR1 is vital for vasopressin binding.

Conclusions:

The novel Q96H mutation in AVPR2 is the likely cause of NDI in this patient.
The conserved Q96 residue is critical for the functional integrity of the AVPR2.
This finding expands the spectrum of known AVPR2 mutations and their impact on NDI pathogenesis.