Genetic Variant AMPD2:c.223-4C>T (chr1-109625658-C-T) – ACMG Classification: Benign (-20 pts)

Variant summary

Our verdict is Benign. The variant received -20 ACMG points: 0P and 20B. BP4_StrongBP6_Very_StrongBS1BS2

The NM_001368809.2(AMPD2):c.223-4C>T variant causes a splice region, intron change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.0012 in 1,613,794 control chromosomes in the GnomAD database, including 22 homozygotes. In-silico tool predicts a benign outcome for this variant. 1/1 splice prediction tools predict no significant impact on normal splicing. Variant has been reported in ClinVar as Likely benign (★★).

Frequency

Genomes: 𝑓 0.0070 ( 16 hom., cov: 33)

Exomes 𝑓: 0.00060 ( 6 hom. )

Consequence

AMPD2
NM_001368809.2 splice_region, intron

Scores

Clinical Significance

Benign/Likely benign criteria provided, multiple submitters, no conflicts B:6

Conservation

PhyloP100: 0.367

Publications

0 publications found

Variant links:

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

AMPD2 links:

Genome browser will be placed here

ACMG classification

Classification was made for transcript

Our verdict: Benign. The variant received -20 ACMG points.

BP4

Computational evidence support a benign effect (BayesDel_noAF=-0.66).

BP6

Variant 1-109625658-C-T is Benign according to our data. Variant chr1-109625658-C-T is described in ClinVar as Benign/Likely_benign. ClinVar VariationId is 210137.Status of the report is criteria_provided_multiple_submitters_no_conflicts, 2 stars.

BS1

Variant frequency is greater than expected in population afr. GnomAd4 allele frequency = 0.00695 (1059/152332) while in subpopulation AFR AF = 0.0238 (988/41564). AF 95% confidence interval is 0.0225. There are 16 homozygotes in GnomAd4. There are 493 alleles in the male GnomAd4 subpopulation. Median coverage is 33. This position passed quality control check.

BS2

High Homozygotes in GnomAd4 at 16 AR,Unknown gene

Variant Effect in Transcripts

ACMG analysis was done for transcript: NM_001368809.2. You can select a different transcript below to see updated ACMG assignments.

RefSeq Transcripts

Gene	Transcript	Tags	HGVSc	Effect	Exon Rank	Protein
AMPD2	NM_001368809.2	MANE Select	c.223-4C>T	splice_region intron	N/A	NP_001355738.1
AMPD2	NM_004037.9		c.223-4C>T	splice_region intron	N/A	NP_004028.4
AMPD2	NM_001308170.1		c.160-4C>T	splice_region intron	N/A	NP_001295099.1

Ensembl Transcripts

Gene	Transcript	Tags	HGVSc	Effect	Exon Rank	Protein
AMPD2	ENST00000528667.7	TSL:1 MANE Select	c.223-4C>T	splice_region intron	N/A	ENSP00000436541.2
AMPD2	ENST00000342115.8	TSL:1	c.142-4C>T	splice_region intron	N/A	ENSP00000345498.4
AMPD2	ENST00000526301.6	TSL:1	n.286-4C>T	splice_region intron	N/A

Frequencies

GnomAD3 genomes

AF:

0.00694

AC:

1056

AN:

152214

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.0238

Gnomad AMI

AF:

0.00

Gnomad AMR

AF:

0.00360

Gnomad ASJ

AF:

0.00

Gnomad EAS

AF:

0.00

Gnomad SAS

AF:

0.000207

Gnomad FIN

AF:

0.00

Gnomad MID

AF:

0.00633

Gnomad NFE

AF:

0.0000441

Gnomad OTH

AF:

0.00478

GnomAD2 exomes

AF:

0.00178

AC:

446

AN:

250974

AF XY:

0.00128

show subpopulations

Gnomad AFR exome

AF:

0.0233

Gnomad AMR exome

AF:

0.00162

Gnomad ASJ exome

AF:

0.00

Gnomad EAS exome

AF:

0.00

Gnomad FIN exome

AF:

0.00

Gnomad NFE exome

AF:

0.0000706

Gnomad OTH exome

AF:

0.000490

GnomAD4 exome

AF:

0.000599

AC:

876

AN:

1461462

Hom.:

Cov.:

AF XY:

0.000531

AC XY:

386

AN XY:

726956

show subpopulations

African (AFR)

AF:

0.0201

AC:

674

AN:

33478

American (AMR)

AF:

0.00186

AC:

AN:

44706

Ashkenazi Jewish (ASJ)

AF:

0.00

AC:

AN:

26126

East Asian (EAS)

AF:

0.00

AC:

AN:

39692

South Asian (SAS)

AF:

0.0000116

AC:

AN:

86222

European-Finnish (FIN)

AF:

0.00

AC:

AN:

53392

Middle Eastern (MID)

AF:

0.000694

AC:

AN:

5762

European-Non Finnish (NFE)

AF:

0.0000180

AC:

AN:

1111720

Other (OTH)

AF:

0.00156

AC:

AN:

60364

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.499

Heterozygous variant carriers

110

164

219

274

0.00

0.20

0.40

0.60

0.80

0.95

Allele balance

Age Distribution

Exome Het

Exome Hom

Variant carriers

110

<30

30-35

35-40

40-45

45-50

50-55

55-60

60-65

65-70

70-75

75-80

>80

Age

GnomAD4 genome

AF:

0.00695

AC:

1059

AN:

152332

Hom.:

Cov.:

AF XY:

0.00662

AC XY:

493

AN XY:

74490

show subpopulations

African (AFR)

AF:

0.0238

AC:

988

AN:

41564

American (AMR)

AF:

0.00359

AC:

AN:

15312

Ashkenazi Jewish (ASJ)

AF:

0.00

AC:

AN:

3472

East Asian (EAS)

AF:

0.00

AC:

AN:

5180

South Asian (SAS)

AF:

0.000207

AC:

AN:

4832

European-Finnish (FIN)

AF:

0.00

AC:

AN:

10624

Middle Eastern (MID)

AF:

0.00680

AC:

AN:

294

European-Non Finnish (NFE)

AF:

0.0000441

AC:

AN:

68028

Other (OTH)

AF:

0.00473

AC:

AN:

2114

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.495

Heterozygous variant carriers

102

154

205

256

0.00

0.20

0.40

0.60

0.80

0.95

Allele balance

Age Distribution

Genome Het

Genome Hom

Variant carriers

100

<30

30-35

35-40

40-45

45-50

50-55

55-60

60-65

65-70

70-75

75-80

>80

Age

Alfa

AF:

0.00220

Hom.:

Bravo

AF:

0.00778

Asia WGS

AF:

0.000866

AC:

AN:

3478

EpiCase

AF:

0.00

EpiControl

AF:

0.0000593

ClinVar

ClinVar submissions as Germline

Significance:Benign/Likely benign

Revision:criteria provided, multiple submitters, no conflicts

View on ClinVar

Pathogenic

VUS

Benign

Condition

not provided (2)

Hereditary spastic paraplegia 63 (1)

Hereditary spastic paraplegia 63;C4014354:Pontocerebellar hypoplasia type 9 (1)

not specified (1)

Pontocerebellar hypoplasia type 9 (1)

Computational scores

Source: dbNSFP v4.9

Name

Calibrated prediction

Score

Prediction

BayesDel_noAF

Benign

-0.66

CADD

Benign

1.6

(source)

DANN

Benign

0.87

PhyloP100

0.37

RBP_binding_hub_radar

0.0

RBP_regulation_power_radar

1.7

Mutation Taster

=98/2

polymorphism

(source)

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

You must be logged in to view publications. This limit was set because tens of millions (!) of queries from AI bots are generated daily.

Variant summary

Frequency

Consequence

Scores

Clinical Significance

Conservation

Publications

ACMG classification

Variant Effect in Transcripts

RefSeq Transcripts

Ensembl Transcripts

Frequencies

Age Distribution

Age Distribution

ClinVar

Computational scores

Splicing

Publications

Other links and lift over