chr20-3082772-T-G

Position:

• chr20-3082772-T-G

Variant summary

Our verdict is Uncertain significance. Variant got 3 ACMG points: 4P and 1B. PM1 PM2 BP4

The NM_000490.5(AVP):​c.353A>C​(p.Glu118Ala) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.0000009 in 1,111,080 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. 12/21 in silico tools predict a benign outcome for this variant. Variant has been reported in ClinVar as Uncertain significance (★). Another variant affecting the same amino acid position, but resulting in a different missense (i.e. E118V) has been classified as Uncertain significance.

• Frequency:
  • Genomes: not found (cov: 34)
  • Exomes 𝑓: 9.0e-7 (0 hom.)
• Consequence: AVP NM_000490.5 missense
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: 0.0500

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 3 ACMG points.

• PM1: In a hotspot region, there are 2 aminoacids with missense pathogenic changes in the window of +-8 aminoacids around while only 2 benign, 4 uncertain in NM_000490.5
• PM2: Very rare variant in population databases, with high coverage
• BP4: Computational evidence support a benign effect (MetaRNN=0.3247273).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
AVP	NM_000490.5	c.353A>C	p.Glu118Ala	missense_variant	3/3	ENST00000380293.3

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
AVP	ENST00000380293.3	c.353A>C	p.Glu118Ala	missense_variant	3/3	1	NM_000490.5	P1

Frequencies

GnomAD3 genomes Cov.: 34

GnomAD4 exome AF: 9.00e-7 AC: 1 AN: 1111080 Hom.: 0 Cov.: 32 AF XY: 0.00000188 AC XY: 1 AN XY: 532890

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: 0.00

Gnomad4 FIN exome AF: 0.00

Gnomad4 NFE exome AF: 0.00000107

Gnomad4 OTH exome AF: 0.00

GnomAD4 genome Cov.: 34

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

Dec 13, 2022

The c.353A>C (p.E118A) alteration is located in exon 3 (coding exon 3) of the AVP gene. This alteration results from a A to C substitution at nucleotide position 353, causing the glutamic acid (E) at amino acid position 118 to be replaced by an alanine (A). 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	0.12
BayesDel_addAF	Uncertain	0.036	T
BayesDel_noAF	Benign	-0.19
CADD	Benign	17
DANN	Benign	0.95
DEOGEN2	Uncertain	0.44	T
Eigen	Benign	-0.88
Eigen_PC	Benign	-0.89
FATHMM_MKL	Benign	0.079	N
LIST_S2	Benign	0.54	T
M_CAP	Pathogenic	0.99	D
MetaRNN	Benign	0.32	T
MetaSVM	Benign	-0.29	T
MutationAssessor	Uncertain	2.2	M
MutationTaster	Benign	1.0	N
PrimateAI	Uncertain	0.68	T
PROVEAN	Benign	-2.0	N
REVEL	Benign	0.22
Sift	Benign	0.047	D
Sift4G	Benign	0.085	T
Polyphen		0.41	B
Vest4		0.12
MutPred		0.39		Gain of MoRF binding (P = 0.0615);
MVP		0.97
MPC		0.66
ClinPred		0.27	T
GERP RS		2.1
Varity_R		0.12
gMVP		0.44

Splicing

Name	Calibrated prediction	Score	Prediction
SpliceAI score (max)		0.050		Details are displayed if max score is > 0.2

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

Publications

No publications associated with this variant yet.

Other links and lift over

hg19: chr20-3063418;