Genetic Variant NM_033504.4:c.422T>A (chr1-32895592-A-T) – ACMG Classification: Uncertain_significance (2 pts)

Variant summary

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

The NM_033504.4(TMEM54):c.422T>A(p.Leu141His) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.00000279 in 1,431,980 control chromosomes in the GnomAD database, with no homozygous occurrence. Variant has been reported in ClinVar as Uncertain significance (★).

Frequency

Genomes: not found (cov: 33)

Exomes 𝑓: 0.0000028 ( 0 hom. )

Consequence

TMEM54
NM_033504.4 missense

Scores

Clinical Significance

Uncertain significance criteria provided, single submitter U:1

Conservation

PhyloP100: 2.71

Publications

0 publications found

Variant links:

Genes affected

TMEM54 (HGNC:24143): (transmembrane protein 54) Predicted to be integral component of membrane. [provided by Alliance of Genome Resources, Apr 2022]

TMEM54 links:

HPCA (HGNC:5144): (hippocalcin) The protein encoded by this gene is a member of neuron-specific calcium-binding proteins family found in the retina and brain. This protein is associated with the plasma membrane. It has similarities to proteins located in the photoreceptor cells that regulate photosignal transduction in a calcium-sensitive manner. This protein displays recoverin activity and a calcium-dependent inhibition of rhodopsin kinase. It is identical to the rat and mouse hippocalcin proteins and thought to play an important role in neurons of the central nervous system in a number of species. [provided by RefSeq, Jul 2008]

HPCA Gene-Disease associations (from GenCC):

torsion dystonia 2
Inheritance: AR Classification: STRONG, SUPPORTIVE Submitted by: Orphanet, Genomics England PanelApp, Labcorp Genetics (formerly Invitae)

HPCA links:

Genome browser will be placed here

ACMG classification

Classification was made for transcript

Our verdict: Uncertain_significance. The variant received 2 ACMG points.

PM2

Very rare variant in population databases, with high coverage;

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
TMEM54	NM_033504.4 link	c.422T>A	p.Leu141His	missense_variant	Exon 4 of 6	ENST00000373463.8	NP_277039.1	Q969K7-1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
TMEM54	ENST00000373463.8 link	c.422T>A	p.Leu141His	missense_variant	Exon 4 of 6	1	NM_033504.4	ENSP00000362562.3		Q969K7-1

Frequencies

GnomAD3 genomes

Cov.:

GnomAD4 exome

AF:

0.00000279

AC:

AN:

1431980

Hom.:

Cov.:

AF XY:

0.00

AC XY:

AN XY:

709266

show subpopulations

African (AFR)

AF:

0.00

AC:

AN:

33206

American (AMR)

AF:

0.00

AC:

AN:

38934

Ashkenazi Jewish (ASJ)

AF:

0.00

AC:

AN:

25426

East Asian (EAS)

AF:

0.00

AC:

AN:

38698

South Asian (SAS)

AF:

0.00

AC:

AN:

81962

European-Finnish (FIN)

AF:

0.00

AC:

AN:

51496

Middle Eastern (MID)

AF:

0.00

AC:

AN:

5730

European-Non Finnish (NFE)

AF:

0.00000365

AC:

AN:

1097140

Other (OTH)

AF:

0.00

AC:

AN:

59388

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.488

Heterozygous variant carriers

0.00

0.20

0.40

0.60

0.80

0.95

Allele balance

GnomAD4 genome

Cov.:

Alfa

AF:

0.00

Hom.:

Bravo

AF:

0.00000378

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

LINK: link

Submissions by phenotype

not specified

Uncertain:1

Nov 08, 2024

Ambry Genetics

Significance:Uncertain significance

Review Status:criteria provided, single submitter

Collection Method:clinical testing

The c.422T>A (p.L141H) alteration is located in exon 4 (coding exon 4) of the TMEM54 gene. This alteration results from a T to A substitution at nucleotide position 422, causing the leucine (L) at amino acid position 141 to be replaced by a histidine (H). 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

0.14

BayesDel_addAF

Uncertain

0.028

BayesDel_noAF

Benign

-0.20

CADD

Benign

(source)

DANN

Uncertain

0.98

DEOGEN2

Benign

0.15

T;.

Eigen

Uncertain

0.28

Eigen_PC

Benign

0.18

FATHMM_MKL

Benign

0.66

LIST_S2

Benign

0.74

T;T

M_CAP

Benign

0.026

MetaRNN

Uncertain

0.63

D;D

MetaSVM

Benign

-0.79

MutationAssessor

Uncertain

2.5

M;.

PhyloP100

2.7

PrimateAI

Uncertain

0.49

PROVEAN

Uncertain

-3.1

D;D

REVEL

Benign

0.24

Sift

Benign

0.033

D;D

Sift4G

Uncertain

0.055

T;D

Polyphen

1.0

D;D

Vest4

0.55

MutPred

0.49

Loss of stability (P = 0.0071);.;

MVP

0.37

MPC

0.89

ClinPred

0.96

GERP RS

5.3

RBP_binding_hub_radar

0.0

RBP_regulation_power_radar

1.7

Varity_R

0.28

gMVP

0.38

Mutation Taster

=68/32

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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NM_033504.4:c.422T>A

Variant summary

Frequency

Consequence

Scores

Clinical Significance

Conservation

Publications

ACMG classification

Transcripts

RefSeq

Ensembl

Frequencies

Age Distribution

ClinVar

Submissions by phenotype

Computational scores

Splicing

Publications

Other links and lift over