Genetic Variant BCHE:p.Ala212Asp (chr3-165830399-G-T) – ACMG Classification: Uncertain_significance (4 pts)

Variant summary

Our verdict is Uncertain significance. The variant received 4 ACMG points: 4P and 0B. PM2PM5

The NM_000055.4(BCHE):c.635C>A(p.Ala212Asp) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.000000684 in 1,461,694 control chromosomes in the GnomAD database, with no homozygous occurrence. No clinical diagnostic laboratories have submitted clinical-significance assessments for this variant to ClinVar. Another variant affecting the same amino acid position, but resulting in a different missense (i.e. A212V) has been classified as Likely pathogenic.

Frequency

Genomes: not found (cov: 32)

Exomes 𝑓: 6.8e-7 ( 0 hom. )

Consequence

BCHE
NM_000055.4 missense

Scores

Clinical Significance

Not reported in ClinVar

Conservation

PhyloP100: 1.68

Publications

0 publications found

Variant links:

Genes affected

BCHE (HGNC:983): (butyrylcholinesterase) This gene encodes a cholinesterase enzyme and member of the type-B carboxylesterase/lipase family of proteins. The encoded enzyme exhibits broad substrate specificity and is involved in the detoxification of poisons including organophosphate nerve agents and pesticides, and the metabolism of drugs including cocaine, heroin and aspirin. Humans homozygous for certain mutations in this gene exhibit prolonged apnea after administration of the muscle relaxant succinylcholine. [provided by RefSeq, Jul 2016]

BCHE links:

LINC01322 (HGNC:50528): (long intergenic non-protein coding RNA 1322)

LINC01322 links:

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ACMG classification

Classification was made for transcript

Our verdict: Uncertain_significance. The variant received 4 ACMG points.

PM2

Very rare variant in population databases, with high coverage;

PM5

Other missense variant is known to change same aminoacid residue: Variant chr3-165830399-G-A is described in ClinVar as [Conflicting_classifications_of_pathogenicity]. Clinvar id is 370854.We mark this variant Likely_pathogenic, oryginal submission is: [Conflicting_classifications_of_pathogenicity].

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
BCHE	NM_000055.4 link	c.635C>A	p.Ala212Asp	missense_variant	Exon 2 of 4	ENST00000264381.8	NP_000046.1	P06276
BCHE	NR_137636.2 link	n.753C>A		non_coding_transcript_exon_variant	Exon 2 of 5
BCHE	NR_137635.2 link	n.110+6915C>A		intron_variant	Intron 1 of 2

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
BCHE	ENST00000264381.8 link	c.635C>A	p.Ala212Asp	missense_variant	Exon 2 of 4	1	NM_000055.4	ENSP00000264381.3		P06276

Frequencies

GnomAD3 genomes

Cov.:

GnomAD4 exome

AF:

6.84e-7

AC:

AN:

1461694

Hom.:

Cov.:

AF XY:

0.00000138

AC XY:

AN XY:

727122

show subpopulations

⚠️ The allele balance in gnomAD version 4 Exomes is significantly skewed from the expected value of 0.5.

African (AFR)

AF:

0.00

AC:

AN:

33470

American (AMR)

AF:

0.00

AC:

AN:

44698

Ashkenazi Jewish (ASJ)

AF:

0.00

AC:

AN:

26126

East Asian (EAS)

AF:

0.00

AC:

AN:

39694

South Asian (SAS)

AF:

0.00

AC:

AN:

86252

European-Finnish (FIN)

AF:

0.00

AC:

AN:

53394

Middle Eastern (MID)

AF:

0.00

AC:

AN:

5766

European-Non Finnish (NFE)

AF:

8.99e-7

AC:

AN:

1111904

Other (OTH)

AF:

0.00

AC:

AN:

60390

⚠️ The allele balance in gnomAD4 Exomes is highly skewed from 0.5 (p-value = 0.000000), which strongly suggests a high chance of mosaicism in these individuals.

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.375

Heterozygous variant carriers

0.00

0.20

0.40

0.60

0.80

0.95

Allele balance

GnomAD4 genome

Cov.:

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

AlphaMissense

Benign

0.15

BayesDel_addAF

Uncertain

0.12

BayesDel_noAF

Uncertain

-0.060

CADD

Benign

(source)

DANN

Uncertain

0.99

DEOGEN2

Uncertain

0.64

Eigen

Benign

0.034

Eigen_PC

Benign

0.089

FATHMM_MKL

Benign

0.62

LIST_S2

Benign

0.82

M_CAP

Benign

0.030

MetaRNN

Uncertain

0.72

MetaSVM

Benign

-0.52

MutationAssessor

Pathogenic

2.9

PhyloP100

1.7

PrimateAI

Uncertain

0.50

PROVEAN

Uncertain

-2.7

REVEL

Uncertain

0.41

Sift

Benign

0.13

Sift4G

Benign

0.20

Polyphen

0.24

Vest4

0.66

MutPred

0.73

Loss of MoRF binding (P = 0.1371);

MVP

0.96

MPC

0.025

ClinPred

0.94

GERP RS

4.8

Varity_R

0.77

gMVP

0.74

Mutation Taster

=69/31

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

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Variant summary

Frequency

Consequence

Scores

Clinical Significance

Conservation

Publications

ACMG classification

Transcripts

RefSeq

Ensembl

Frequencies

ClinVar

Computational scores

Splicing

Publications

Other links and lift over