20-3084620-C-T

Position:

• chr20-3084620-C-T

Variant summary

Our verdict is Pathogenic. Variant got 14 ACMG points: 14P and 0B. PM2 PP3_Strong PP5_Very_Strong

The NM_000490.5(AVP):​c.55G>A​(p.Ala19Thr) variant causes a missense change involving the alteration of a conserved nucleotide. The variant was absent in control chromosomes in GnomAD project. In-silico tool predicts a pathogenic outcome for this variant. Variant has been reported in ClinVar as Pathogenic (★★).

• Frequency: Genomes: not found (cov: 33)
• Consequence: AVP NM_000490.5 missense
• Clinical Significance: Pathogenic criteria provided, multiple submitters, no conflicts P:6
• Conservation: PhyloP100: 7.66

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 Pathogenic. Variant got 14 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• PP3: MetaRNN computational evidence supports a deleterious effect, 0.994
• PP5: Variant 20-3084620-C-T is Pathogenic according to our data. Variant chr20-3084620-C-T is described in ClinVar as [Pathogenic]. Clinvar id is 12206.Status of the report is criteria_provided_multiple_submitters_no_conflicts, 2 stars. Variant chr20-3084620-C-T is described in Lovd as [Pathogenic].

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
AVP	NM_000490.5	c.55G>A	p.Ala19Thr	missense_variant	1/3	ENST00000380293.3	NP_000481.2

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
AVP	ENST00000380293.3	c.55G>A	p.Ala19Thr	missense_variant	1/3	1	NM_000490.5	ENSP00000369647.3

Frequencies

GnomAD3 genomes Cov.: 33

GnomAD4 exome Cov.: 32

GnomAD4 genome Cov.: 33

ClinVar

Significance: Pathogenic

Submissions summary: Pathogenic:6

Revision: criteria provided, multiple submitters, no conflicts

Submissions by phenotype

not provided Pathogenic:3

Pathogenic, no assertion criteria provided	clinical testing	Joint Genome Diagnostic Labs from Nijmegen and Maastricht, Radboudumc and MUMC+	-	- -
Pathogenic, no assertion criteria provided	clinical testing	Genome Diagnostics Laboratory, University Medical Center Utrecht	-	- -
Pathogenic, criteria provided, single submitter	clinical testing	Labcorp Genetics (formerly Invitae), Labcorp	Jan 29, 2024	This sequence change replaces alanine, which is neutral and non-polar, with threonine, which is neutral and polar, at codon 19 of the AVP protein (p.Ala19Thr). This variant is not present in population databases (gnomAD no frequency). This missense change has been observed in individual(s) with familial neurohypophyseal diabetes insipidus (PMID: 8370682, 31238300). It has also been observed to segregate with disease in related individuals. ClinVar contains an entry for this variant (Variation ID: 12206). An algorithm developed to predict the effect of missense changes on protein structure and function (PolyPhen-2) suggests that this variant is likely to be disruptive. For these reasons, this variant has been classified as Pathogenic. -

Neurohypophyseal diabetes insipidus Pathogenic:2

Pathogenic, no assertion criteria provided	literature only	OMIM	Aug 01, 1999	- -
Pathogenic, criteria provided, single submitter	clinical testing	Fulgent Genetics, Fulgent Genetics	Dec 21, 2021	- -

AVP-related disorder Pathogenic:1

Pathogenic, no assertion criteria provided

clinical testing

PreventionGenetics, part of Exact Sciences

Sep 23, 2024

The AVP c.55G>A variant is predicted to result in the amino acid substitution p.Ala19Thr. This variant has been reported to be pathogenic for neurohypophyseal diabetes insipidus (Christensen et al. 2004. PubMed ID: 14673472, reported as 279G>A, p.A19T; Patti et al. 2019. PubMed ID: 31238300). In addition, a different substitution affecting the same amino acid (c.56C>T, p.Ala19Val) has also been reported to be pathogenic (Rittig et al. 1996. PubMed ID: 8554046; Patti et al. 2019. PubMed ID: 31238300). This variant has not been reported in a large population database, indicating this variant is rare. This variant is interpreted as pathogenic. -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Uncertain	0.49
BayesDel_addAF	Pathogenic	0.54	D
BayesDel_noAF	Pathogenic	0.54
CADD	Uncertain	26
DANN	Pathogenic	1.0
DEOGEN2	Uncertain	0.72	D
Eigen	Uncertain	0.60
Eigen_PC	Uncertain	0.45
FATHMM_MKL	Pathogenic	0.99	D
LIST_S2	Uncertain	0.91	D
M_CAP	Pathogenic	0.61	D
MetaRNN	Pathogenic	0.99	D
MetaSVM	Pathogenic	1.2	D
MutationAssessor	Pathogenic	3.1	M
PrimateAI	Uncertain	0.60	T
PROVEAN	Uncertain	-3.5	D
REVEL	Pathogenic	0.80
Sift	Uncertain	0.0010	D
Sift4G	Uncertain	0.0020	D
Polyphen		1.0	D
Vest4		0.97
MutPred		0.96		Gain of sheet (P = 0.0827);
MVP		0.99
MPC		1.5
ClinPred		1.0	D
GERP RS		4.5
Varity_R		0.62
gMVP		0.81

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: rs387906511; hg19: chr20-3065266; COSMIC: COSV66672097;