Genetic Variant ABHD16B:p.Arg43Trp (chr20-63861667-C-T) – ACMG Classification: Likely_benign (-2 pts)

Variant summary

Our verdict is Likely benign. Variant got -2 ACMG points: 2P and 4B. PM2BP4_Strong

The NM_080622.4(ABHD16B):c.127C>T(p.Arg43Trp) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.0000429 in 1,536,868 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. 13/21 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. R43Q) has been classified as Uncertain significance.

Frequency

Genomes: 𝑓 0.00011 ( 0 hom., cov: 31)

Exomes 𝑓: 0.000035 ( 0 hom. )

Consequence

ABHD16B
NM_080622.4 missense

Scores

Clinical Significance

Uncertain significance criteria provided, single submitter U:1

Conservation

PhyloP100: -0.671

Variant links:

Genes affected

ABHD16B (HGNC:16128): (abhydrolase domain containing 16B) Predicted to enable acylglycerol lipase activity; palmitoyl-(protein) hydrolase activity; and phospholipase activity. Predicted to be involved in monoacylglycerol catabolic process and phosphatidylserine catabolic process. Located in nucleoplasm. [provided by Alliance of Genome Resources, Apr 2022]

ABHD16B links:

ENSG00000268858 (HGNC:):

ENSG00000268858 links:

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ACMG classification

Classification made for transcript

Verdict is Likely_benign. Variant got -2 ACMG points.

PM2

Very rare variant in population databases, with high coverage;

BP4

Computational evidence support a benign effect (MetaRNN=0.056010276).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
ABHD16B	NM_080622.4 link	c.127C>T	p.Arg43Trp	missense_variant	Exon 1 of 1	ENST00000369916.5	NP_542189.1	Q9H3Z7

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
ABHD16B	ENST00000369916.5 link	c.127C>T	p.Arg43Trp	missense_variant	Exon 1 of 1	6	NM_080622.4	ENSP00000358932.3		Q9H3Z7
ENSG00000268858	ENST00000601296.2 link	n.2627G>A		non_coding_transcript_exon_variant	Exon 1 of 1	6

Frequencies

GnomAD3 genomes

AF:

0.000112

AC:

AN:

151918

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.000387

Gnomad AMI

AF:

0.00

Gnomad AMR

AF:

0.0000655

Gnomad ASJ

AF:

0.00

Gnomad EAS

AF:

0.00

Gnomad SAS

AF:

0.00

Gnomad FIN

AF:

0.00

Gnomad MID

AF:

0.00

Gnomad NFE

AF:

0.00

Gnomad OTH

AF:

0.00

GnomAD3 exomes

AF:

0.0000869

AC:

AN:

138032

Hom.:

AF XY:

0.0000803

AC XY:

AN XY:

74688

show subpopulations

Gnomad AFR exome

AF:

0.000141

Gnomad AMR exome

AF:

0.000369

Gnomad ASJ exome

AF:

0.00

Gnomad EAS exome

AF:

0.00

Gnomad SAS exome

AF:

0.00

Gnomad FIN exome

AF:

0.00

Gnomad NFE exome

AF:

0.0000188

Gnomad OTH exome

AF:

0.000240

GnomAD4 exome

AF:

0.0000354

AC:

AN:

1384838

Hom.:

Cov.:

AF XY:

0.0000439

AC XY:

AN XY:

683532

show subpopulations

Gnomad4 AFR exome

AF:

0.000482

Gnomad4 AMR exome

AF:

0.000338

Gnomad4 ASJ exome

AF:

0.00

Gnomad4 EAS exome

AF:

0.000566

Gnomad4 SAS exome

AF:

0.00

Gnomad4 FIN exome

AF:

0.00

Gnomad4 NFE exome

AF:

9.29e-7

Gnomad4 OTH exome

AF:

0.0000173

GnomAD4 genome

AF:

0.000112

AC:

AN:

152030

Hom.:

Cov.:

AF XY:

0.0000807

AC XY:

AN XY:

74358

show subpopulations

Gnomad4 AFR

AF:

0.000386

Gnomad4 AMR

AF:

0.0000655

Gnomad4 ASJ

AF:

0.00

Gnomad4 EAS

AF:

0.00

Gnomad4 SAS

AF:

0.00

Gnomad4 FIN

AF:

0.00

Gnomad4 NFE

AF:

0.00

Gnomad4 OTH

AF:

0.00

Bravo

AF:

0.000166

ExAC

AF:

0.0000240

AC:

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

LINK: link

Submissions by phenotype

not specified

Uncertain:1

Jul 27, 2024

Ambry Genetics

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

The c.127C>T (p.R43W) alteration is located in exon 1 (coding exon 1) of the ABHD16B gene. This alteration results from a C to T substitution at nucleotide position 127, causing the arginine (R) at amino acid position 43 to be replaced by a tryptophan (W). 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

0.10

BayesDel_addAF

Benign

-0.55

BayesDel_noAF

Benign

-0.72

CADD

Benign

7.9

DANN

Uncertain

0.98

DEOGEN2

Benign

0.0081

Eigen

Benign

-1.3

Eigen_PC

Benign

-1.4

FATHMM_MKL

Benign

0.034

LIST_S2

Benign

0.52

M_CAP

Benign

0.025

MetaRNN

Benign

0.056

MetaSVM

Benign

-1.0

MutationAssessor

Benign

0.0

PrimateAI

Uncertain

0.71

PROVEAN

Benign

-1.8

REVEL

Benign

0.044

Sift

Uncertain

0.016

Sift4G

Uncertain

0.010

Polyphen

0.0

Vest4

0.23

MutPred

0.36

Loss of disorder (P = 0.0023);

MVP

0.12

MPC

0.68

ClinPred

0.013

GERP RS

-2.0

Varity_R

0.037

gMVP

0.25

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

Below is the list of publications found by LitVar. It may be empty.

Variant summary

Frequency

Consequence

Scores

Clinical Significance

Conservation

ACMG classification

Transcripts

RefSeq

Ensembl

Frequencies

ClinVar

Submissions by phenotype

Computational scores

Splicing

Publications

LitVar

Other links and lift over