Genetic Variant MCC:p.Leu998His (chr5-113027369-A-T) – ACMG Classification: Uncertain_significance (3 pts)

Variant summary

Our verdict is Uncertain significance. The variant received 3 ACMG points: 3P and 0B. PM2PP3

The NM_001085377.2(MCC):c.2993T>A(p.Leu998His) variant causes a missense change. The variant allele was found at a frequency of 0.00000274 in 1,461,886 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a pathogenic outcome for this variant. Variant has been reported in ClinVar as Uncertain significance (★).

Frequency

Genomes: not found (cov: 32)

Exomes 𝑓: 0.0000027 ( 0 hom. )

Consequence

MCC
NM_001085377.2 missense

Scores

Clinical Significance

Uncertain significance criteria provided, single submitter U:1

Conservation

PhyloP100: 7.08

Publications

0 publications found

Variant links:

Genes affected

MCC (HGNC:6935): (MCC regulator of WNT signaling pathway) This gene is a candidate colorectal tumor suppressor gene that is thought to negatively regulate cell cycle progression. The orthologous gene in the mouse expresses a phosphoprotein associated with the plasma membrane and membrane organelles, and overexpression of the mouse protein inhibits entry into S phase. Multiple transcript variants encoding different isoforms have been found for this gene. [provided by RefSeq, Jul 2008]

MCC links:

Genome browser will be placed here

ACMG classification

Classification was made for transcript

Our verdict: Uncertain_significance. The variant received 3 ACMG points.

PM2

Very rare variant in population databases, with high coverage;

PP3

MetaRNN computational evidence supports a deleterious effect, 0.764

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
MCC	NM_001085377.2 link	c.2993T>A	p.Leu998His	missense_variant	Exon 19 of 19	ENST00000408903.7	NP_001078846.2	P23508-2
MCC	NM_002387.3 link	c.2423T>A	p.Leu808His	missense_variant	Exon 17 of 17		NP_002378.2	P23508-1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	UniProt
MCC	ENST00000408903.7 link	c.2993T>A	p.Leu998His	missense_variant	Exon 19 of 19	2	NM_001085377.2	ENSP00000386227.3	P23508-2
MCC	ENST00000302475.9 link	c.2423T>A	p.Leu808His	missense_variant	Exon 17 of 17	1		ENSP00000305617.4	P23508-1
MCC	ENST00000515367.6 link	c.2234T>A	p.Leu745His	missense_variant	Exon 17 of 17	5		ENSP00000421615.2	D6REY2

Frequencies

GnomAD3 genomes

Cov.:

GnomAD4 exome

AF:

0.00000274

AC:

AN:

1461886

Hom.:

Cov.:

AF XY:

0.00000413

AC XY:

AN XY:

727242

show subpopulations

African (AFR)

AF:

0.00

AC:

AN:

33480

American (AMR)

AF:

0.00

AC:

AN:

44724

Ashkenazi Jewish (ASJ)

AF:

0.00

AC:

AN:

26136

East Asian (EAS)

AF:

0.00

AC:

AN:

39700

South Asian (SAS)

AF:

0.00

AC:

AN:

86258

European-Finnish (FIN)

AF:

0.00

AC:

AN:

53420

Middle Eastern (MID)

AF:

0.00

AC:

AN:

5768

European-Non Finnish (NFE)

AF:

0.00000360

AC:

AN:

1112004

Other (OTH)

AF:

0.00

AC:

AN:

60396

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.550

Heterozygous variant carriers

0.00

0.20

0.40

0.60

0.80

0.95

Allele balance

GnomAD4 genome

Cov.:

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

LINK: link

Submissions by phenotype

not specified

Uncertain:1

May 01, 2025

Ambry Genetics

Significance:Uncertain significance

Review Status:criteria provided, single submitter

Collection Method:clinical testing

The c.2993T>A (p.L998H) alteration is located in exon 19 (coding exon 19) of the MCC gene. This alteration results from a T to A substitution at nucleotide position 2993, causing the leucine (L) at amino acid position 998 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

Pathogenic

0.99

BayesDel_addAF

Pathogenic

0.31

BayesDel_noAF

Pathogenic

0.21

CADD

Pathogenic

(source)

DANN

Uncertain

0.98

DEOGEN2

Uncertain

0.66

D;.;.

Eigen

Uncertain

0.63

Eigen_PC

Pathogenic

0.68

FATHMM_MKL

Uncertain

0.92

LIST_S2

Uncertain

0.97

D;D;D

M_CAP

Uncertain

0.090

MetaRNN

Pathogenic

0.76

D;D;D

MetaSVM

Benign

-0.50

MutationAssessor

Benign

0.69

N;.;.

PhyloP100

7.1

PrimateAI

Pathogenic

0.90

PROVEAN

Pathogenic

-5.3

D;D;D

REVEL

Uncertain

0.43

Sift

Pathogenic

0.0

D;D;D

Sift4G

Uncertain

0.014

D;D;D

Polyphen

1.0

D;.;D

Vest4

0.87

MutPred

0.29

Loss of stability (P = 0.0467);.;.;

MVP

0.73

MPC

0.50

ClinPred

0.99

GERP RS

5.8

Varity_R

0.89

gMVP

0.79

Mutation Taster

=71/29

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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5-113027369-A-T

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