DHCR7 p.Val330Met

Variant names:

Variant summary

Our verdict is Uncertain significance. The variant received 1 ACMG points: 2P and 1B. PM1BP4

The NM_001360.3(DHCR7):c.988G>A(p.Val330Met) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.000411 in 1,603,764 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. Variant has been reported in ClinVar as Conflicting classifications of pathogenicity (no stars). Synonymous variant affecting the same amino acid position (i.e. V330V) has been classified as Likely benign.

Frequency

Genomes: 𝑓 0.00043 ( 0 hom., cov: 35)

Exomes 𝑓: 0.00041 ( 0 hom. )

Consequence

DHCR7
NM_001360.3 missense

Scores

Clinical Significance

Conflicting classifications of pathogenicity criteria provided, conflicting classifications P:1U:12

Conservation

PhyloP100: 3.28

Publications

11 publications found

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 Gene-Disease associations (from GenCC):

Smith-Lemli-Opitz syndrome
Inheritance: AR Classification: DEFINITIVE, STRONG, SUPPORTIVE Submitted by: Labcorp Genetics (formerly Invitae), Laboratory for Molecular Medicine, Myriad Women's Health, G2P, ClinGen, Orphanet

DHCR7 links:

Genome browser will be placed here

new If you want to explore the variant's impact on the transcript NM_001360.3, check out the Mutation Effect Viewer. This is especially useful for frameshift variants or if you want to visualize the effect of exon loss / intron retention.

ACMG classification

Classification was made for transcript

Our verdict: Uncertain_significance. The variant received 1 ACMG points.

PM1

In a hotspot region, there are 6 aminoacids with missense pathogenic changes in the window of +-8 aminoacids around while only 1 benign, 8 uncertain in NM_001360.3

BP4

Computational evidence support a benign effect (MetaRNN=0.39428446).

Variant Effect in Transcripts

ACMG analysis was done for transcript: NM_001360.3. You can select a different transcript below to see updated ACMG assignments.

RefSeq Transcripts

Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
DHCR7	NM_001360.3	MANE Select	c.988G>A	p.Val330Met	missense	Exon 9 of 9	NP_001351.2	A0A024R5F7
DHCR7	NM_001425107.1		c.1039G>A	p.Val347Met	missense	Exon 10 of 10	NP_001412036.1	A0A804HI25
DHCR7	NM_001425108.1		c.1024G>A	p.Val342Met	missense	Exon 9 of 9	NP_001412037.1	A0A804HJQ7

Ensembl Transcripts

Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
DHCR7	ENST00000355527.8	TSL:1 MANE Select	c.988G>A	p.Val330Met	missense	Exon 9 of 9	ENSP00000347717.4	Q9UBM7
DHCR7	ENST00000407721.6	TSL:1	c.988G>A	p.Val330Met	missense	Exon 9 of 9	ENSP00000384739.2	Q9UBM7
DHCR7	ENST00000685320.1		c.403G>A	p.Val135Met	missense	Exon 8 of 8	ENSP00000509319.1	B4E1K5

Frequencies

GnomAD3 genomes

AF:

0.000427

AC:

AN:

152204

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.000241

Gnomad AMI

AF:

0.00

Gnomad AMR

AF:

0.00111

Gnomad ASJ

AF:

0.00

Gnomad EAS

AF:

0.00

Gnomad SAS

AF:

0.00

Gnomad FIN

AF:

0.0000942

Gnomad MID

AF:

0.00

Gnomad NFE

AF:

0.000485

Gnomad OTH

AF:

0.00191

GnomAD2 exomes

AF:

0.000364

AC:

AN:

239088

AF XY:

0.000367

show subpopulations

Gnomad AFR exome

AF:

0.000268

Gnomad AMR exome

AF:

0.000643

Gnomad ASJ exome

AF:

0.00

Gnomad EAS exome

AF:

0.0000557

Gnomad FIN exome

AF:

0.000103

Gnomad NFE exome

AF:

0.000496

Gnomad OTH exome

AF:

0.000679

GnomAD4 exome

AF:

0.000409

AC:

594

AN:

1451442

Hom.:

Cov.:

AF XY:

0.000420

AC XY:

303

AN XY:

720604

show subpopulations

African (AFR)

AF:

0.0000900

AC:

AN:

33340

American (AMR)

AF:

0.000651

AC:

AN:

44516

Ashkenazi Jewish (ASJ)

AF:

0.00

AC:

AN:

25876

East Asian (EAS)

AF:

0.0000253

AC:

AN:

39500

South Asian (SAS)

AF:

0.0000233

AC:

AN:

85946

European-Finnish (FIN)

AF:

0.000337

AC:

AN:

50416

Middle Eastern (MID)

AF:

0.00261

AC:

AN:

5750

European-Non Finnish (NFE)

AF:

0.000455

AC:

503

AN:

1106150

Other (OTH)

AF:

0.000400

AC:

AN:

59948

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.484

Heterozygous variant carriers

106

141

176

0.00

0.20

0.40

0.60

0.80

0.95

Allele balance

Age Distribution

Exome Het

Variant carriers

110

<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:

0.000427

AC:

AN:

152322

Hom.:

Cov.:

AF XY:

0.000457

AC XY:

AN XY:

74472

show subpopulations

African (AFR)

AF:

0.000241

AC:

AN:

41576

American (AMR)

AF:

0.00111

AC:

AN:

15306

Ashkenazi Jewish (ASJ)

AF:

0.00

AC:

AN:

3468

East Asian (EAS)

AF:

0.00

AC:

AN:

5170

South Asian (SAS)

AF:

0.00

AC:

AN:

4826

European-Finnish (FIN)

AF:

0.0000942

AC:

AN:

10618

Middle Eastern (MID)

AF:

0.00

AC:

AN:

294

European-Non Finnish (NFE)

AF:

0.000485

AC:

AN:

68038

Other (OTH)

AF:

0.00189

AC:

AN:

2114

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.490

Heterozygous variant carriers

0.00

0.20

0.40

0.60

0.80

0.95

Allele balance

Age Distribution

Genome Het

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:

0.000677

Hom.:

Bravo

AF:

0.000370

EpiCase

AF:

0.000654

EpiControl

AF:

0.000771

ClinVar

ClinVar submissions

Significance:Conflicting classifications of pathogenicity

Revision:criteria provided, conflicting classifications

View on ClinVar

Pathogenic

VUS

Benign

Condition

Smith-Lemli-Opitz syndrome (7)

not provided (3)

DHCR7-related disorder (1)

Hepatoblastoma (1)

not specified (1)

Computational scores

Source: dbNSFP v4.9

Name

Calibrated prediction

Score

Prediction

AlphaMissense

Benign

0.15

BayesDel_addAF

Pathogenic

0.17

BayesDel_noAF

Pathogenic

0.37

CADD

Pathogenic

(source)

DANN

Uncertain

1.0

DEOGEN2

Pathogenic

0.92

Eigen

Uncertain

0.57

Eigen_PC

Uncertain

0.44

FATHMM_MKL

Uncertain

0.90

LIST_S2

Uncertain

0.95

M_CAP

Uncertain

0.17

MetaRNN

Benign

0.39

MetaSVM

Pathogenic

0.88

MutationAssessor

Pathogenic

3.3

PhyloP100

3.3

PrimateAI

Uncertain

0.63

PROVEAN

Benign

-2.1

REVEL

Pathogenic

0.72

Sift

Uncertain

0.0050

Sift4G

Uncertain

0.025

RBP_binding_hub_radar

0.0

RBP_regulation_power_radar

1.8

Varity_R

0.32

gMVP

0.81

Mutation Taster

=8/92

disease causing

(source)

Splicing

Name

Calibrated prediction

Score

Prediction

SpliceAI score (max)

0.13

Details are displayed if max score is > 0.2

Find out detailed SpliceAI scores and Pangolin per-transcript scores at spliceailookup.broadinstitute.org

MaxEntScan Visualizer can be used to analyze the impact of this mutation on the neighboring sequence.

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

Computational scores

Splicing

Publications

Other links and lift over