NM_001368809.2:c.106C>G

Variant names:

• chr1-109625317-C-G
• rs749918422
• NM_001368809.2:c.106C>G

Variant summary

Our verdict is Uncertain significance. The variant received 0 ACMG points: 2P and 2B. PM2 BP4_Moderate

The NM_001368809.2(AMPD2):​c.106C>G​(p.Leu36Val) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.0000103 in 1,460,786 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. 16/22 in silico tools predict a benign outcome for this variant. Variant has been reported in ClinVar as Uncertain significance (★★).

• Frequency:
  • Genomes: not found (cov: 33)
  • Exomes 𝑓: 0.000010 (0 hom.)
• Consequence: AMPD2 NM_001368809.2 missense
• Clinical Significance: Uncertain significance criteria provided, multiple submitters, no conflicts U:2
• Conservation: PhyloP100: 2.02
• Publications: 1 publications found

Genes affected

AMPD2 (HGNC:469): (adenosine monophosphate deaminase 2) The protein encoded by this gene is important in purine metabolism by converting AMP to IMP. The encoded protein, which acts as a homotetramer, is one of three AMP deaminases found in mammals. Several transcript variants encoding different isoforms have been found for this gene. [provided by RefSeq, Apr 2012]

AMPD2 Gene-Disease associations (from GenCC):

• pontocerebellar hypoplasia type 9

  Inheritance: AR Classification: DEFINITIVE, STRONG, SUPPORTIVE Submitted by: Orphanet, Labcorp Genetics (formerly Invitae), PanelApp Australia, G2P, Ambry Genetics
• hereditary spastic paraplegia 63

  Inheritance: Unknown, AR Classification: SUPPORTIVE, LIMITED Submitted by: Labcorp Genetics (formerly Invitae), Orphanet

ACMG classification

Our verdict: Uncertain_significance. The variant received 0 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• BP4: Computational evidence support a benign effect (MetaRNN=0.17303967).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
AMPD2	NM_001368809.2	c.106C>G	p.Leu36Val	missense_variant	Exon 3 of 19	ENST00000528667.7	NP_001355738.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
AMPD2	ENST00000528667.7	c.106C>G	p.Leu36Val	missense_variant	Exon 3 of 19	1	NM_001368809.2	ENSP00000436541.2

Frequencies

GnomAD3 genomes Cov.: 33

GnomAD2 exomes AF: 0.0000122 AC: 3 AN: 245140 AF XY: 0.0000150

Gnomad AFR exome AF: 0.00

Gnomad AMR exome AF: 0.00

Gnomad ASJ exome AF: 0.00

Gnomad EAS exome AF: 0.00

Gnomad FIN exome AF: 0.00

Gnomad NFE exome AF: 0.0000274

Gnomad OTH exome AF: 0.00

GnomAD4 exome AF: 0.0000103 AC: 15 AN: 1460786 Hom.: 0 Cov.: 32 AF XY: 0.0000110 AC XY: 8 AN XY: 726746

African (AFR) AF: 0.00 AC: 0 AN: 33476

American (AMR) AF: 0.00 AC: 0 AN: 44684

Ashkenazi Jewish (ASJ) AF: 0.00 AC: 0 AN: 26082

East Asian (EAS) AF: 0.00 AC: 0 AN: 39694

South Asian (SAS) AF: 0.00 AC: 0 AN: 86210

European-Finnish (FIN) AF: 0.00 AC: 0 AN: 52754

Middle Eastern (MID) AF: 0.00 AC: 0 AN: 5764

European-Non Finnish (NFE) AF: 0.0000117 AC: 13 AN: 1111766

Other (OTH) AF: 0.0000331 AC: 2 AN: 60356

GnomAD4 genome Cov.: 33

Alfa AF: 0.00 Hom.: 0

Bravo AF: 0.00000756

ExAC AF: 0.00000824 AC: 1

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:2

Revision: criteria provided, multiple submitters, no conflicts

Submissions by phenotype

Hereditary spastic paraplegia 63;C4014354:Pontocerebellar hypoplasia type 9 Uncertain:2

May 09, 2024

Fulgent Genetics, Fulgent Genetics

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

- -

Feb 07, 2017

Labcorp Genetics (formerly Invitae), Labcorp

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

In summary, this variant is a rare missense change that is not predicted to affect protein function. There is no indication that it causes disease, but the available evidence is currently insufficient to prove that conclusively. Therefore, it has been classified as a Variant of Uncertain Significance. Algorithms developed to predict the effect of missense changes on protein structure and function (SIFT, PolyPhen-2, Align-GVGD) all suggest that this variant is likely to be tolerated, but these predictions have not been confirmed by published functional studies. This variant is present in population databases (rs749918422, ExAC 0.002%) but has not been reported in the literature in individuals with a AMPD2-related disease. This sequence change replaces leucine with valine at codon 90 of the AMPD2 protein (p.Leu90Val). The leucine residue is moderately conserved and there is a small physicochemical difference between leucine and valine. -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Benign	0.070
BayesDel_addAF	Benign	-0.13	T
BayesDel_noAF	Benign	-0.31
CADD	Benign	18
DANN	Uncertain	0.99
DEOGEN2	Benign	0.21	.;.;T;T;T
Eigen	Benign	-0.24
Eigen_PC	Benign	-0.11
FATHMM_MKL	Uncertain	0.94	D
LIST_S2	Benign	0.79	T;T;.;T;.
M_CAP	Benign	0.015	T
MetaRNN	Benign	0.17	T;T;T;T;T
MetaSVM	Benign	-1.1	T
MutationAssessor	Benign	0.0	.;.;N;N;.
PhyloP100		2.0
PrimateAI	Benign	0.46	T
PROVEAN	Benign	-0.62	N;N;N;N;N
REVEL	Benign	0.25
Sift	Benign	0.14	T;T;T;T;T
Sift4G	Benign	0.57	T;T;T;T;T
Polyphen		0.023, 0.12	.;B;B;B;.
Vest4		0.36, 0.36, 0.34
MutPred		0.31		.;.;Gain of loop (P = 0.0851);Gain of loop (P = 0.0851);.;
MVP		0.71
MPC		0.66
ClinPred		0.082	T
GERP RS		4.1
RBP_binding_hub_radar		0.0
RBP_regulation_power_radar		1.7
Varity_R		0.067
gMVP		0.19
Mutation Taster		=85/15	polymorphism

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

Other links and lift over

dbSNP: rs749918422; hg19: chr1-110167939;