chr2-135788386-G-A

Position:

chr2-135788386-G-A

Variant summary

Our verdict is Likely benign. Variant got -2 ACMG points: 3P and 5B. PM2PP2BP4_StrongBP6

The NM_002299.4(LCT):c.5722C>T(p.Arg1908Cys) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.000139 in 1,614,022 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. 14/21 in silico tools predict a benign outcome for this variant. Variant has been reported in ClinVar as Conflicting classifications of pathogenicity (no stars). Another variant affecting the same amino acid position, but resulting in a different missense (i.e. R1908H) has been classified as Uncertain significance.

Frequency

Genomes: 𝑓 0.00011 ( 0 hom., cov: 33)

Exomes 𝑓: 0.00014 ( 0 hom. )

Consequence

LCT
NM_002299.4 missense

Scores

Clinical Significance

Conflicting classifications of pathogenicity criteria provided, conflicting classifications U:1B:1

Conservation

PhyloP100: 0.288

Variant links:

Genes affected

LCT (HGNC:6530): (lactase) The protein encoded by this gene belongs to the glycosyl hydrolase 1 family of proteins. The encoded preproprotein is proteolytically processed to generate the mature enzyme. This enzyme is integral to the plasma membrane and has both phlorizin hydrolase activity and lactase activity. Mutations in this gene are associated with congenital lactase deficiency. Polymorphisms in this gene are associated with lactase persistence, in which intestinal lactase activity persists at childhood levels into adulthood. [provided by RefSeq, Jan 2016]

LCT 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;

PP2

Missense variant in gene, where missense usually causes diseases (based on misZ statistic), LCT. . Gene score misZ 3.1554 (greater than the threshold 3.09). Trascript score misZ 4.9736 (greater than threshold 3.09). GenCC has associacion of gene with congenital lactase deficiency.

BP4

Computational evidence support a benign effect (MetaRNN=0.025337279).

BP6

Variant 2-135788386-G-A is Benign according to our data. Variant chr2-135788386-G-A is described in ClinVar as [Conflicting_classifications_of_pathogenicity]. Clinvar id is 1025930.We mark this variant Likely_benign, oryginal submissions are: {Likely_benign=1, Uncertain_significance=1}.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
LCT	NM_002299.4 linkuse as main transcript	c.5722C>T	p.Arg1908Cys	missense_variant	17/17	ENST00000264162.7

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
LCT	ENST00000264162.7 linkuse as main transcript	c.5722C>T	p.Arg1908Cys	missense_variant	17/17	1	NM_002299.4	P1

Frequencies

GnomAD3 genomes

AF:

0.000112

AC:

AN:

152188

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.00

Gnomad AMI

AF:

0.00

Gnomad AMR

AF:

0.00

Gnomad ASJ

AF:

0.00

Gnomad EAS

AF:

0.000192

Gnomad SAS

AF:

0.00

Gnomad FIN

AF:

0.000283

Gnomad MID

AF:

0.00

Gnomad NFE

AF:

0.000191

Gnomad OTH

AF:

0.00

GnomAD3 exomes

AF:

0.000223

AC:

AN:

251452

Hom.:

AF XY:

0.000206

AC XY:

AN XY:

135900

show subpopulations

Gnomad AFR exome

AF:

0.00

Gnomad AMR exome

AF:

0.00

Gnomad ASJ exome

AF:

0.00

Gnomad EAS exome

AF:

0.000381

Gnomad SAS exome

AF:

0.000261

Gnomad FIN exome

AF:

0.000508

Gnomad NFE exome

AF:

0.000255

Gnomad OTH exome

AF:

0.000163

GnomAD4 exome

AF:

0.000142

AC:

207

AN:

1461834

Hom.:

Cov.:

AF XY:

0.000150

AC XY:

109

AN XY:

727212

show subpopulations

Gnomad4 AFR exome

AF:

0.00

Gnomad4 AMR exome

AF:

0.00

Gnomad4 ASJ exome

AF:

0.00

Gnomad4 EAS exome

AF:

0.000252

Gnomad4 SAS exome

AF:

0.000359

Gnomad4 FIN exome

AF:

0.000543

Gnomad4 NFE exome

AF:

0.000101

Gnomad4 OTH exome

AF:

0.000397

GnomAD4 genome

AF:

0.000112

AC:

AN:

152188

Hom.:

Cov.:

AF XY:

0.000108

AC XY:

AN XY:

74346

show subpopulations

Gnomad4 AFR

AF:

0.00

Gnomad4 AMR

AF:

0.00

Gnomad4 ASJ

AF:

0.00

Gnomad4 EAS

AF:

0.000192

Gnomad4 SAS

AF:

0.00

Gnomad4 FIN

AF:

0.000283

Gnomad4 NFE

AF:

0.000191

Gnomad4 OTH

AF:

0.00

Alfa

AF:

0.000115

Hom.:

Bravo

AF:

0.0000793

ESP6500AA

AF:

0.00

AC:

ESP6500EA

AF:

0.000233

AC:

ExAC

AF:

0.000255

AC:

Asia WGS

AF:

0.000577

AC:

AN:

3478

EpiCase

AF:

0.000491

EpiControl

AF:

0.000237

ClinVar

Significance: Conflicting classifications of pathogenicity

Submissions summary: Uncertain:1Benign:1

Revision: criteria provided, conflicting classifications

LINK: link

Submissions by phenotype

not provided

Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Labcorp Genetics (formerly Invitae), Labcorp

Jun 15, 2022

This sequence change replaces arginine, which is basic and polar, with cysteine, which is neutral and slightly polar, at codon 1908 of the LCT protein (p.Arg1908Cys). This variant is present in population databases (rs138964370, gnomAD 0.05%). This variant has not been reported in the literature in individuals affected with LCT-related conditions. ClinVar contains an entry for this variant (Variation ID: 1025930). Algorithms developed to predict the effect of missense changes on protein structure and function output the following: SIFT: "Not Available"; PolyPhen-2: "Benign"; Align-GVGD: "Not Available". The cysteine amino acid residue is found in multiple mammalian species, which suggests that this missense change does not adversely affect protein function. In summary, the available evidence is currently insufficient to determine the role of this variant in disease. Therefore, it has been classified as a Variant of Uncertain Significance. -

Congenital lactase deficiency

Benign:1

Likely benign, criteria provided, single submitter

clinical testing

3billion

Sep 20, 2024

The homozygous variant was found in patients diagnosed with another variant in a different gene, with no symptoms related to the gene containing the homozygous variant. -

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

AlphaMissense

Benign

0.087

BayesDel_addAF

Benign

-0.48

BayesDel_noAF

Benign

-0.61

CADD

Benign

8.0

DANN

Benign

0.66

DEOGEN2

Benign

0.33

Eigen

Benign

-1.3

Eigen_PC

Benign

-1.3

FATHMM_MKL

Benign

0.099

LIST_S2

Benign

0.32

M_CAP

Benign

0.011

MetaRNN

Benign

0.025

MetaSVM

Benign

-1.0

MutationAssessor

Uncertain

2.3

MutationTaster

Benign

1.0

PrimateAI

Benign

0.21

PROVEAN

Benign

-1.1

REVEL

Benign

0.055

Sift

Benign

0.18

Sift4G

Benign

0.20

Polyphen

0.0

Vest4

0.080

MVP

0.19

MPC

0.84

ClinPred

0.026

GERP RS

0.60

Varity_R

0.075

gMVP

0.33

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