Genetic Variant TMCC2:p.Leu74Pro (chr1-205241518-T-C) – ACMG Classification: Uncertain_significance (2 pts)

Variant summary

Our verdict is Uncertain significance. Variant got 2 ACMG points: 2P and 0B. PM2

The NM_014858.4(TMCC2):c.221T>C(p.Leu74Pro) variant causes a missense change. The variant allele was found at a frequency of 0.0000161 in 1,613,456 control chromosomes in the GnomAD database, with no homozygous occurrence. Variant has been reported in ClinVar as Uncertain significance (★).

Frequency

Genomes: 𝑓 0.000013 ( 0 hom., cov: 32)

Exomes 𝑓: 0.000016 ( 0 hom. )

Consequence

TMCC2
NM_014858.4 missense

Scores

Clinical Significance

Uncertain significance criteria provided, single submitter U:1

Conservation

PhyloP100: 4.17

Variant links:

Genes affected

TMCC2 (HGNC:24239): (transmembrane and coiled-coil domain family 2) Involved in amyloid precursor protein metabolic process. Located in endoplasmic reticulum. [provided by Alliance of Genome Resources, Apr 2022]

TMCC2 links:

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ACMG classification

Classification made for transcript

Verdict is Uncertain_significance. Variant got 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
TMCC2	NM_014858.4 link	c.221T>C	p.Leu74Pro	missense_variant	Exon 2 of 5	ENST00000358024.8	NP_055673.2	O75069-1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	UniProt
TMCC2	ENST00000358024.8 link	c.221T>C	p.Leu74Pro	missense_variant	Exon 2 of 5	1	NM_014858.4	ENSP00000350718.3	O75069-1
TMCC2	ENST00000545499 link	c.-14T>C		5_prime_UTR_variant	Exon 2 of 5	2		ENSP00000437943.1	O75069-2
TMCC2	ENST00000495538.5 link	n.452T>C		non_coding_transcript_exon_variant	Exon 2 of 5	5

Frequencies

GnomAD3 genomes

AF:

0.0000132

AC:

AN:

152028

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.00

Gnomad AMI

AF:

0.00

Gnomad AMR

AF:

0.000131

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:

0.0000958

AC:

AN:

250454

Hom.:

AF XY:

0.0000812

AC XY:

AN XY:

135550

show subpopulations

Gnomad AFR exome

AF:

0.00

Gnomad AMR exome

AF:

0.000694

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:

0.00

Gnomad OTH exome

AF:

0.00

GnomAD4 exome

AF:

0.0000164

AC:

AN:

1461428

Hom.:

Cov.:

AF XY:

0.0000151

AC XY:

AN XY:

726974

show subpopulations

Gnomad4 AFR exome

AF:

0.00

Gnomad4 AMR exome

AF:

0.000537

Gnomad4 ASJ exome

AF:

0.00

Gnomad4 EAS exome

AF:

0.00

Gnomad4 SAS exome

AF:

0.00

Gnomad4 FIN exome

AF:

0.00

Gnomad4 NFE exome

AF:

0.00

Gnomad4 OTH exome

AF:

0.00

GnomAD4 genome

AF:

0.0000132

AC:

AN:

152028

Hom.:

Cov.:

AF XY:

0.0000135

AC XY:

AN XY:

74262

show subpopulations

Gnomad4 AFR

AF:

0.00

Gnomad4 AMR

AF:

0.000131

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

Alfa

AF:

0.0000844

Hom.:

Bravo

AF:

0.0000453

ExAC

AF:

0.0000741

AC:

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

LINK: link

Submissions by phenotype

not specified

Uncertain:1

Jan 19, 2024

Ambry Genetics

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

The c.221T>C (p.L74P) alteration is located in exon 2 (coding exon 2) of the TMCC2 gene. This alteration results from a T to C substitution at nucleotide position 221, causing the leucine (L) at amino acid position 74 to be replaced by a proline (P). 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

Pathogenic

0.94

BayesDel_addAF

Benign

-0.18

BayesDel_noAF

Benign

-0.12

CADD

Pathogenic

DANN

Uncertain

1.0

DEOGEN2

Benign

0.044

Eigen

Uncertain

0.31

Eigen_PC

Uncertain

0.29

FATHMM_MKL

Uncertain

0.87

LIST_S2

Benign

0.69

M_CAP

Uncertain

0.10

MetaRNN

Uncertain

0.55

MetaSVM

Benign

-0.80

MutationAssessor

Benign

1.4

PrimateAI

Pathogenic

0.91

PROVEAN

Benign

-0.33

REVEL

Benign

0.23

Sift

Uncertain

0.0010

Sift4G

Uncertain

0.014

Polyphen

0.99

Vest4

0.90

MutPred

0.19

Loss of helix (P = 0.0033);

MVP

0.53

MPC

2.0

ClinPred

0.21

GERP RS

4.8

Varity_R

0.29

gMVP

0.60

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