chr20-3082716-C-T

Position:

• chr20-3082716-C-T

Variant summary

Our verdict is Uncertain significance. Variant got 2 ACMG points: 2P and 0B. PM2

The NM_000490.5(AVP):​c.409G>A​(p.Gly137Arg) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.00000353 in 1,133,958 control chromosomes in the GnomAD database, with no homozygous occurrence. Variant has been reported in ClinVar as Uncertain significance (★). Another nucleotide change resulting in same amino acid change has been previously reported as Uncertain significancein ClinVar.

• Frequency:
  • Genomes: not found (cov: 34)
  • Exomes 𝑓: 0.0000035 (0 hom.)
• Consequence: AVP NM_000490.5 missense
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: 0.380

Genes affected

AVP (HGNC:894): (arginine vasopressin) This gene encodes a member of the vasopressin/oxytocin family and preproprotein that is proteolytically processed to generate multiple protein products. These products include the neuropeptide hormone arginine vasopressin, and two other peptides, neurophysin 2 and copeptin. Arginine vasopressin is a posterior pituitary hormone that is synthesized in the supraoptic nucleus and paraventricular nucleus of the hypothalamus. Along with its carrier protein, neurophysin 2, it is packaged into neurosecretory vesicles and transported axonally to the nerve endings in the neurohypophysis where it is either stored or secreted into the bloodstream. The precursor is thought to be activated while it is being transported along the axon to the posterior pituitary. Arginine vasopressin acts as a growth factor by enhancing pH regulation through acid-base transport systems. It has a direct antidiuretic action on the kidney, and also causes vasoconstriction of the peripheral vessels. This hormone can contract smooth muscle during parturition and lactation. It is also involved in cognition, tolerance, adaptation and complex sexual and maternal behaviour, as well as in the regulation of water excretion and cardiovascular functions. Mutations in this gene cause autosomal dominant neurohypophyseal diabetes insipidus (ADNDI). This gene is present in a gene cluster with the related gene oxytocin on chromosome 20. [provided by RefSeq, Nov 2015]

ACMG classification

Verdict is Uncertain_significance. Variant got 2 ACMG points.

• PM2: Very rare variant in population databases, with high coverage

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
AVP	NM_000490.5	c.409G>A	p.Gly137Arg	missense_variant	3/3	ENST00000380293.3

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
AVP	ENST00000380293.3	c.409G>A	p.Gly137Arg	missense_variant	3/3	1	NM_000490.5	P1

Frequencies

GnomAD3 genomes Cov.: 34

GnomAD4 exome AF: 0.00000353 AC: 4 AN: 1133958 Hom.: 0 Cov.: 32 AF XY: 0.00000366 AC XY: 2 AN XY: 545896

Gnomad4 AFR exome AF: 0.00

Gnomad4 AMR exome AF: 0.00

Gnomad4 ASJ exome AF: 0.00

Gnomad4 EAS exome AF: 0.00

Gnomad4 SAS exome AF: 0.0000839

Gnomad4 FIN exome AF: 0.00

Gnomad4 NFE exome AF: 0.00

Gnomad4 OTH exome AF: 0.0000220

GnomAD4 genome Cov.: 34

Bravo AF: 0.0000113

ExAC AF: 0.0000529 AC: 1

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

Submissions by phenotype

Inborn genetic diseases Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Ambry Genetics

Nov 09, 2023

The c.409G>A (p.G137R) alteration is located in exon 3 (coding exon 3) of the AVP gene. This alteration results from a G to A substitution at nucleotide position 409, causing the glycine (G) at amino acid position 137 to be replaced by an arginine (R). Based on insufficient or conflicting evidence, the clinical significance of this alteration remains unclear. -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Benign	0.14
BayesDel_addAF	Pathogenic	0.18	D
BayesDel_noAF	Uncertain	0.020
CADD	Uncertain	23
DANN	Uncertain	1.0
DEOGEN2	Benign	0.35	T
Eigen	Benign	0.043
Eigen_PC	Benign	0.076
FATHMM_MKL	Benign	0.56	D
LIST_S2	Benign	0.70	T
M_CAP	Pathogenic	0.98	D
MetaRNN	Uncertain	0.44	T
MetaSVM	Uncertain	0.74	D
MutationAssessor	Uncertain	2.3	M
MutationTaster	Benign	0.53	N
PrimateAI	Pathogenic	0.87	D
PROVEAN	Benign	-2.3	N
REVEL	Uncertain	0.52
Sift	Uncertain	0.0020	D
Sift4G	Uncertain	0.012	D
Polyphen		0.94	P
Vest4		0.13
MutPred		0.43		Gain of solvent accessibility (P = 0.0023);
MVP		1.0
MPC		0.68
ClinPred		0.92	D
GERP RS		4.4
Varity_R		0.15
gMVP		0.40

Splicing

Name	Calibrated prediction	Score	Prediction
SpliceAI score (max)		0.0		Details are displayed if max score is > 0.2

Find out detailed SpliceAI scores and Pangolin per-transcript scores at spliceailookup.broadinstitute.org

Publications

LitVar

Other links and lift over

dbSNP: rs765019311; hg19: chr20-3063362;