Genetic Variant L1CAM:p.Asp206Glu (chrX-153870866-G-T) – ACMG Classification: Benign (-7 pts)

Variant summary

Our verdict is Benign. The variant received -7 ACMG points: 2P and 9B. PM1BP6BS1BS2

The NM_001278116.2(L1CAM):c.618C>A(p.Asp206Glu) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.000247 in 1,209,123 control chromosomes in the GnomAD database, including 1 homozygotes. There are 89 hemizygotes in GnomAD. Variant has been reported in ClinVar as Conflicting classifications of pathogenicity (no stars).

Frequency

Genomes: 𝑓 0.000063 ( 0 hom., 1 hem., cov: 23)

Exomes 𝑓: 0.00027 ( 1 hom. 88 hem. )

Consequence

L1CAM
NM_001278116.2 missense

Scores

Clinical Significance

Conflicting classifications of pathogenicity criteria provided, conflicting classifications U:2B:1

Conservation

PhyloP100: 3.49

Publications

3 publications found

Variant links:

Genes affected

L1CAM (HGNC:6470): (L1 cell adhesion molecule) The protein encoded by this gene is an axonal glycoprotein belonging to the immunoglobulin supergene family. The ectodomain, consisting of several immunoglobulin-like domains and fibronectin-like repeats (type III), is linked via a single transmembrane sequence to a conserved cytoplasmic domain. This cell adhesion molecule plays an important role in nervous system development, including neuronal migration and differentiation. Mutations in the gene cause X-linked neurological syndromes known as CRASH (corpus callosum hypoplasia, retardation, aphasia, spastic paraplegia and hydrocephalus). Alternative splicing of this gene results in multiple transcript variants, some of which include an alternate exon that is considered to be specific to neurons. [provided by RefSeq, May 2013]

L1CAM Gene-Disease associations (from GenCC):

L1 syndrome
Inheritance: XL Classification: DEFINITIVE Submitted by: ClinGen
X-linked hydrocephalus with stenosis of the aqueduct of Sylvius
Inheritance: XL Classification: DEFINITIVE, STRONG, SUPPORTIVE Submitted by: Genomics England PanelApp, Orphanet, G2P
MASA syndrome
Inheritance: XL Classification: STRONG, SUPPORTIVE Submitted by: Genomics England PanelApp, Orphanet
X-linked complicated corpus callosum dysgenesis
Inheritance: XL Classification: STRONG, SUPPORTIVE Submitted by: Orphanet, Genomics England PanelApp, Labcorp Genetics (formerly Invitae)
X-linked complicated spastic paraplegia type 1
Inheritance: XL Classification: SUPPORTIVE Submitted by: Orphanet

L1CAM links:

Genome browser will be placed here

ACMG classification

Classification was made for transcript

Our verdict: Benign. The variant received -7 ACMG points.

PM1

In a hotspot region, there are 4 aminoacids with missense pathogenic changes in the window of +-8 aminoacids around while only 0 benign, 3 uncertain in NM_001278116.2

BP6

Variant X-153870866-G-T is Benign according to our data. Variant chrX-153870866-G-T is described in ClinVar as Conflicting_classifications_of_pathogenicity. ClinVar VariationId is 211342.

BS1

Variant frequency is greater than expected in population nfe. GnomAdExome4 allele frequency = 0.000266 (292/1097608) while in subpopulation NFE AF = 0.000337 (284/841572). AF 95% confidence interval is 0.000304. There are 1 homozygotes in GnomAdExome4. There are 88 alleles in the male GnomAdExome4 subpopulation. Median coverage is 33. This position passed quality control check.

BS2

High Hemizygotes in GnomAdExome4 at 88 XL gene

Variant Effect in Transcripts

ACMG analysis was done for transcript: NM_001278116.2. You can select a different transcript below to see updated ACMG assignments.

RefSeq Transcripts

Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein
L1CAM	NM_001278116.2	MANE Select	c.618C>A	p.Asp206Glu	missense	Exon 7 of 29	NP_001265045.1
L1CAM	NM_000425.5		c.618C>A	p.Asp206Glu	missense	Exon 6 of 28	NP_000416.1
L1CAM	NM_024003.3		c.618C>A	p.Asp206Glu	missense	Exon 6 of 27	NP_076493.1

Ensembl Transcripts

Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein
L1CAM	ENST00000370060.7	TSL:5 MANE Select	c.618C>A	p.Asp206Glu	missense	Exon 7 of 29	ENSP00000359077.1
L1CAM	ENST00000361699.8	TSL:1	c.618C>A	p.Asp206Glu	missense	Exon 6 of 27	ENSP00000355380.4
L1CAM	ENST00000361981.7	TSL:1	c.603C>A	p.Asp201Glu	missense	Exon 5 of 26	ENSP00000354712.3

Frequencies

GnomAD3 genomes

AF:

0.0000628

AC:

AN:

111515

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:

0.00

Gnomad SAS

AF:

0.00

Gnomad FIN

AF:

0.00

Gnomad MID

AF:

0.00

Gnomad NFE

AF:

0.000132

Gnomad OTH

AF:

0.00

GnomAD2 exomes

AF:

0.0000763

AC:

AN:

183477

AF XY:

0.000103

show subpopulations

Gnomad AFR exome

AF:

0.00

Gnomad AMR exome

AF:

0.0000365

Gnomad ASJ exome

AF:

0.00

Gnomad EAS exome

AF:

0.00

Gnomad FIN exome

AF:

0.00

Gnomad NFE exome

AF:

0.000146

Gnomad OTH exome

AF:

0.000221

GnomAD4 exome

AF:

0.000266

AC:

292

AN:

1097608

Hom.:

Cov.:

AF XY:

0.000242

AC XY:

AN XY:

362972

show subpopulations

African (AFR)

AF:

0.0000379

AC:

AN:

26384

American (AMR)

AF:

0.0000284

AC:

AN:

35207

Ashkenazi Jewish (ASJ)

AF:

0.00

AC:

AN:

19383

East Asian (EAS)

AF:

0.00

AC:

AN:

30204

South Asian (SAS)

AF:

0.00

AC:

AN:

54129

European-Finnish (FIN)

AF:

0.00

AC:

AN:

40520

Middle Eastern (MID)

AF:

0.00

AC:

AN:

4135

European-Non Finnish (NFE)

AF:

0.000337

AC:

284

AN:

841572

Other (OTH)

AF:

0.000130

AC:

AN:

46074

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.493

Heterozygous variant carriers

0.00

0.20

0.40

0.60

0.80

0.95

Allele balance

Age Distribution

Exome Het

Exome Hom

Variant carriers

100

<30

30-35

35-40

40-45

45-50

50-55

55-60

60-65

65-70

70-75

75-80

>80

Age

GnomAD4 genome

AF:

0.0000628

AC:

AN:

111515

Hom.:

Cov.:

AF XY:

0.0000297

AC XY:

AN XY:

33673

show subpopulations

African (AFR)

AF:

0.00

AC:

AN:

30636

American (AMR)

AF:

0.00

AC:

AN:

10557

Ashkenazi Jewish (ASJ)

AF:

0.00

AC:

AN:

2647

East Asian (EAS)

AF:

0.00

AC:

AN:

3532

South Asian (SAS)

AF:

0.00

AC:

AN:

2654

European-Finnish (FIN)

AF:

0.00

AC:

AN:

6026

Middle Eastern (MID)

AF:

0.00

AC:

AN:

240

European-Non Finnish (NFE)

AF:

0.000132

AC:

AN:

53044

Other (OTH)

AF:

0.00

AC:

AN:

1498

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.542

Heterozygous variant carriers

0.00

0.20

0.40

0.60

0.80

0.95

Allele balance

Age Distribution

Genome Het

Genome Hom

Variant carriers

<30

30-35

35-40

40-45

45-50

50-55

55-60

60-65

65-70

70-75

75-80

>80

Age

Alfa

AF:

0.00

Hom.:

Bravo

AF:

0.0000491

TwinsUK

AF:

0.000270

AC:

ALSPAC

AF:

0.000346

AC:

ESP6500AA

AF:

0.00

AC:

ESP6500EA

AF:

0.000149

AC:

ExAC

AF:

0.0000577

AC:

EpiCase

AF:

0.000164

EpiControl

AF:

0.000296

ClinVar

Significance: Conflicting classifications of pathogenicity

Submissions summary: Uncertain:2Benign:1

Revision: criteria provided, conflicting classifications

LINK: link

Submissions by phenotype

not specified

Uncertain:1

Jul 09, 2015

Genetic Services Laboratory, University of Chicago

Significance:Uncertain significance

Review Status:criteria provided, single submitter

Collection Method:clinical testing

not provided

Uncertain:1

Jun 01, 2016

CeGaT Center for Human Genetics Tuebingen

Significance:Uncertain significance

Review Status:criteria provided, single submitter

Collection Method:clinical testing

Spastic paraplegia

Benign:1

Nov 18, 2024

Labcorp Genetics (formerly Invitae), Labcorp

Significance:Benign

Review Status:criteria provided, single submitter

Collection Method:clinical testing

Computational scores

Source: dbNSFP v4.9

Name

Calibrated prediction

Score

Prediction

AlphaMissense

Pathogenic

0.62

BayesDel_addAF

Benign

-0.12

BayesDel_noAF

Benign

-0.15

CADD

Uncertain

(source)

DANN

Uncertain

1.0

DEOGEN2

Uncertain

0.73

FATHMM_MKL

Uncertain

0.91

LIST_S2

Uncertain

0.88

M_CAP

Pathogenic

0.41

MetaRNN

Uncertain

0.70

MetaSVM

Uncertain

-0.17

MutationAssessor

Uncertain

2.2

PhyloP100

3.5

PrimateAI

Pathogenic

0.81

PROVEAN

Uncertain

-3.8

REVEL

Pathogenic

0.65

Sift

Uncertain

0.0010

Sift4G

Uncertain

0.0080

Polyphen

1.0

Vest4

0.53

MutPred

0.70

Gain of catalytic residue at D206 (P = 0.045)

MVP

0.91

MPC

1.4

ClinPred

0.54

GERP RS

2.6

Varity_R

0.73

gMVP

0.96

Mutation Taster

=100/0

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

Variant Effect in Transcripts

RefSeq Transcripts

Ensembl Transcripts

Frequencies

Age Distribution

Age Distribution

ClinVar

Submissions by phenotype

Computational scores

Splicing

Publications

Other links and lift over