11-71444018-A-G

Position:

chr11-71444018-A-G

Variant summary

Our verdict is Pathogenic. Variant got 16 ACMG points: 16P and 0B. PM1PM2PP3_StrongPP5_Very_Strong

The ENST00000355527.8(DHCR7):c.296T>C(p.Leu99Pro) variant causes a missense change involving the alteration of a conserved nucleotide. The variant allele was found at a frequency of 0.0000116 in 1,460,672 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 Likely pathogenic (★★). Synonymous variant affecting the same amino acid position (i.e. L99L) has been classified as Likely benign.

Frequency

Genomes: not found (cov: 33)

Exomes 𝑓: 0.000012 ( 0 hom. )

Consequence

DHCR7
ENST00000355527.8 missense

Scores

Clinical Significance

Pathogenic/Likely pathogenic criteria provided, multiple submitters, no conflicts P:4

Conservation

PhyloP100: 7.77

Variant links:

Genes affected

DHCR7 (HGNC:2860): (7-dehydrocholesterol reductase) This gene encodes an enzyme that removes the C(7-8) double bond in the B ring of sterols and catalyzes the conversion of 7-dehydrocholesterol to cholesterol. This gene is ubiquitously expressed and its transmembrane protein localizes to the endoplasmic reticulum membrane and nuclear outer membrane. Mutations in this gene cause Smith-Lemli-Opitz syndrome (SLOS); a syndrome that is metabolically characterized by reduced serum cholesterol levels and elevated serum 7-dehydrocholesterol levels and phenotypically characterized by cognitive disability, facial dysmorphism, syndactyly of second and third toes, and holoprosencephaly in severe cases to minimal physical abnormalities and near-normal intelligence in mild cases. Alternative splicing results in multiple transcript variants that encode the same protein.[provided by RefSeq, Aug 2009]

DHCR7 links:

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ACMG classification

Classification made for transcript

Verdict is Pathogenic. Variant got 16 ACMG points.

PM1

In a hotspot region, there are 2 aminoacids with missense pathogenic changes in the window of +-8 aminoacids around while only 0 benign, 4 uncertain in ENST00000355527.8

PM2

Very rare variant in population databases, with high coverage;

PP3

MetaRNN computational evidence supports a deleterious effect, 0.977

PP5

Variant 11-71444018-A-G is Pathogenic according to our data. Variant chr11-71444018-A-G is described in ClinVar as [Likely_pathogenic]. Clinvar id is 553296.Status of the report is criteria_provided_multiple_submitters_no_conflicts, 2 stars. Variant chr11-71444018-A-G is described in Lovd as [Pathogenic].

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein
DHCR7	NM_001360.3 linkuse as main transcript	c.296T>C	p.Leu99Pro	missense_variant	4/9	ENST00000355527.8	NP_001351.2
DHCR7	NM_001163817.2 linkuse as main transcript	c.296T>C	p.Leu99Pro	missense_variant	4/9		NP_001157289.1
DHCR7	XM_011544777.3 linkuse as main transcript	c.296T>C	p.Leu99Pro	missense_variant	4/9		XP_011543079.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
DHCR7	ENST00000355527.8 linkuse as main transcript	c.296T>C	p.Leu99Pro	missense_variant	4/9	1	NM_001360.3	ENSP00000347717	P1

Frequencies

GnomAD3 genomes

Cov.:

GnomAD3 exomes

AF:

0.00000401

AC:

AN:

249078

Hom.:

AF XY:

0.00

AC XY:

AN XY:

134662

show subpopulations

Gnomad AFR exome

AF:

0.00

Gnomad AMR exome

AF:

0.00

Gnomad ASJ exome

AF:

0.00

Gnomad EAS exome

AF:

0.00

Gnomad SAS exome

AF:

0.00

Gnomad FIN exome

AF:

0.00

Gnomad NFE exome

AF:

0.00000889

Gnomad OTH exome

AF:

0.00

GnomAD4 exome

AF:

0.0000116

AC:

AN:

1460672

Hom.:

Cov.:

AF XY:

0.0000124

AC XY:

AN XY:

726578

show subpopulations

Gnomad4 AFR exome

AF:

0.00

Gnomad4 AMR exome

AF:

0.00

Gnomad4 ASJ exome

AF:

0.00

Gnomad4 EAS exome

AF:

0.00

Gnomad4 SAS exome

AF:

0.00

Gnomad4 FIN exome

AF:

0.00

Gnomad4 NFE exome

AF:

0.0000153

Gnomad4 OTH exome

AF:

0.00

GnomAD4 genome

Cov.:

ExAC

AF:

0.00000824

AC:

ClinVar

Significance: Pathogenic/Likely pathogenic

Submissions summary: Pathogenic:4

Revision: criteria provided, multiple submitters, no conflicts

LINK: link

Submissions by phenotype

Smith-Lemli-Opitz syndrome

Pathogenic:2

Pathogenic, criteria provided, single submitter	clinical testing	Labcorp Genetics (formerly Invitae), Labcorp	Sep 05, 2023	This sequence change replaces leucine, which is neutral and non-polar, with proline, which is neutral and non-polar, at codon 99 of the DHCR7 protein (p.Leu99Pro). This variant is present in population databases (rs104886041, gnomAD 0.0009%). This missense change has been observed in individual(s) with Smith-Lemli-Opitz syndrome (PMID: 9653161, 16181459). In at least one individual the data is consistent with being in trans (on the opposite chromosome) from a pathogenic variant. ClinVar contains an entry for this variant (Variation ID: 553296). Advanced modeling of protein sequence and biophysical properties (such as structural, functional, and spatial information, amino acid conservation, physicochemical variation, residue mobility, and thermodynamic stability) performed at Invitae indicates that this missense variant is expected to disrupt DHCR7 protein function. Experimental studies have shown that this missense change affects DHCR7 function (PMID: 9653161). For these reasons, this variant has been classified as Pathogenic. -
Likely pathogenic, criteria provided, single submitter	clinical testing	Counsyl	Aug 15, 2017	- -

not provided

Pathogenic:2

Likely pathogenic, criteria provided, single submitter	clinical testing	ARUP Laboratories, Molecular Genetics and Genomics, ARUP Laboratories	Dec 01, 2017	- -
Pathogenic, criteria provided, single submitter	clinical testing	GeneDx	Jan 10, 2024	Published functional studies demonstrate a damaging effect [variant reduced DHCR7 protein expression of to less than 10% of wildtype] (PMID: 9653161); Not observed at significant frequency in large population cohorts (gnomAD); In silico analysis supports that this missense variant has a deleterious effect on protein structure/function; This variant is associated with the following publications: (PMID: 31840946, 16181459, 10814720, 11175299, 9653161) -

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

AlphaMissense

Pathogenic

0.87

BayesDel_addAF

Pathogenic

0.54

BayesDel_noAF

Pathogenic

0.53

CADD

Uncertain

DANN

Uncertain

1.0

DEOGEN2

Pathogenic

0.97

D;D;.;T;T;T

Eigen

Uncertain

0.49

Eigen_PC

Uncertain

0.44

FATHMM_MKL

Pathogenic

1.0

LIST_S2

Benign

0.79

.;T;T;T;T;T

M_CAP

Pathogenic

0.35

MetaRNN

Pathogenic

0.98

D;D;D;D;D;D

MetaSVM

Pathogenic

1.1

MutationAssessor

Uncertain

2.5

M;M;.;.;.;.

MutationTaster

Benign

1.0

A;A

PrimateAI

Uncertain

0.49

PROVEAN

Uncertain

-3.1

D;D;D;D;D;D

REVEL

Pathogenic

0.93

Sift

Uncertain

0.010

D;D;D;D;D;D

Sift4G

Uncertain

0.0080

D;D;.;.;D;.

Polyphen

0.97

D;D;.;.;.;.

Vest4

0.87

MutPred

0.83

Loss of stability (P = 0.0308);Loss of stability (P = 0.0308);.;Loss of stability (P = 0.0308);Loss of stability (P = 0.0308);Loss of stability (P = 0.0308);

MVP

0.95

MPC

0.63

ClinPred

0.94

GERP RS

4.5

Varity_R

0.67

gMVP

0.95

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