dbSNP rs4316537: DHCR7:p.Thr77Thr (chr11-71444083-G-A) – ACMG Classification: Benign (-21 pts)

Variant summary

Our verdict is Benign. The variant received -21 ACMG points: 0P and 21B. BP4_StrongBP6_Very_StrongBP7BA1

The NM_001360.3(DHCR7):c.231C>T(p.Thr77Thr) variant causes a synonymous change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.0698 in 1,613,310 control chromosomes in the GnomAD database, including 4,697 homozygotes. In-silico tool predicts a benign outcome for this variant. Variant has been reported in ClinVar as Benign (★★). Synonymous variant affecting the same amino acid position (i.e. T77T) has been classified as Likely benign.

Frequency

Genomes: 𝑓 0.087 ( 649 hom., cov: 33)

Exomes 𝑓: 0.068 ( 4048 hom. )

Consequence

DHCR7
NM_001360.3 synonymous

Scores

Clinical Significance

Benign criteria provided, multiple submitters, no conflicts B:11

Conservation

PhyloP100: -3.98

Publications

24 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), G2P, Myriad Women’s Health, ClinGen, Orphanet, Laboratory for Molecular Medicine

DHCR7 links:

Genome browser will be placed here

ACMG classification

Classification was made for transcript

Our verdict: Benign. The variant received -21 ACMG points.

BP4

Computational evidence support a benign effect (BayesDel_noAF=-0.87).

BP6

Variant 11-71444083-G-A is Benign according to our data. Variant chr11-71444083-G-A is described in ClinVar as Benign. ClinVar VariationId is 93716.Status of the report is criteria_provided_multiple_submitters_no_conflicts, 2 stars.

BP7

Synonymous conserved (PhyloP=-3.98 with no splicing effect.

BA1

GnomAd4 highest subpopulation (AFR) allele frequency at 95% confidence interval = 0.129 is higher than 0.05.

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.231C>T	p.Thr77Thr	synonymous	Exon 4 of 9	NP_001351.2	A0A024R5F7
DHCR7	NM_001425107.1		c.231C>T	p.Thr77Thr	synonymous	Exon 4 of 10	NP_001412036.1	A0A804HI25
DHCR7	NM_001425108.1		c.231C>T	p.Thr77Thr	synonymous	Exon 4 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.231C>T	p.Thr77Thr	synonymous	Exon 4 of 9	ENSP00000347717.4	Q9UBM7
DHCR7	ENST00000407721.6	TSL:1	c.231C>T	p.Thr77Thr	synonymous	Exon 4 of 9	ENSP00000384739.2	Q9UBM7
DHCR7	ENST00000685320.1		c.-333-22C>T		intron	N/A	ENSP00000509319.1	B4E1K5

Frequencies

GnomAD3 genomes

AF:

0.0871

AC:

13258

AN:

152136

Hom.:

647

Cov.:

show subpopulations

Gnomad AFR

AF:

0.132

Gnomad AMI

AF:

0.0143

Gnomad AMR

AF:

0.0673

Gnomad ASJ

AF:

0.0889

Gnomad EAS

AF:

0.0971

Gnomad SAS

AF:

0.125

Gnomad FIN

AF:

0.0859

Gnomad MID

AF:

0.123

Gnomad NFE

AF:

0.0615

Gnomad OTH

AF:

0.0939

GnomAD2 exomes

AF:

0.0780

AC:

19441

AN:

249200

AF XY:

0.0806

show subpopulations

Gnomad AFR exome

AF:

0.136

Gnomad AMR exome

AF:

0.0365

Gnomad ASJ exome

AF:

0.0875

Gnomad EAS exome

AF:

0.0961

Gnomad FIN exome

AF:

0.0794

Gnomad NFE exome

AF:

0.0646

Gnomad OTH exome

AF:

0.0754

GnomAD4 exome

AF:

0.0680

AC:

99345

AN:

1461056

Hom.:

4048

Cov.:

AF XY:

0.0702

AC XY:

51043

AN XY:

726718

show subpopulations

African (AFR)

AF:

0.138

AC:

4620

AN:

33474

American (AMR)

AF:

0.0389

AC:

1738

AN:

44630

Ashkenazi Jewish (ASJ)

AF:

0.0886

AC:

2313

AN:

26112

East Asian (EAS)

AF:

0.115

AC:

4553

AN:

39670

South Asian (SAS)

AF:

0.130

AC:

11215

AN:

86038

European-Finnish (FIN)

AF:

0.0750

AC:

4000

AN:

53306

Middle Eastern (MID)

AF:

0.120

AC:

692

AN:

5766

European-Non Finnish (NFE)

AF:

0.0592

AC:

65766

AN:

1111692

Other (OTH)

AF:

0.0737

AC:

4448

AN:

60368

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.484

Heterozygous variant carriers

4952

9904

14856

19808

24760

0.00

0.20

0.40

0.60

0.80

0.95

Allele balance

Age Distribution

Exome Het

Exome Hom

Variant carriers

2482

4964

7446

9928

12410

<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:

0.0871

AC:

13260

AN:

152254

Hom.:

649

Cov.:

AF XY:

0.0893

AC XY:

6649

AN XY:

74436

show subpopulations

African (AFR)

AF:

0.132

AC:

5473

AN:

41536

American (AMR)

AF:

0.0671

AC:

1027

AN:

15304

Ashkenazi Jewish (ASJ)

AF:

0.0889

AC:

308

AN:

3466

East Asian (EAS)

AF:

0.0973

AC:

504

AN:

5180

South Asian (SAS)

AF:

0.126

AC:

607

AN:

4826

European-Finnish (FIN)

AF:

0.0859

AC:

912

AN:

10614

Middle Eastern (MID)

AF:

0.122

AC:

AN:

294

European-Non Finnish (NFE)

AF:

0.0615

AC:

4184

AN:

68012

Other (OTH)

AF:

0.0929

AC:

196

AN:

2110

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.499

Heterozygous variant carriers

611

1222

1832

2443

3054

0.00

0.20

0.40

0.60

0.80

0.95

Allele balance

Age Distribution

Genome Het

Genome Hom

Variant carriers

154

308

462

616

770

<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:

0.0699

Hom.:

656

Bravo

AF:

0.0842

Asia WGS

AF:

0.0790

AC:

272

AN:

3478

ClinVar

ClinVar submissions

Significance:Benign

Revision:criteria provided, multiple submitters, no conflicts

View on ClinVar

Pathogenic

VUS

Benign

Condition

Smith-Lemli-Opitz syndrome (6)

not provided (2)

not specified (2)

Inborn genetic diseases (1)

Computational scores

Source: dbNSFP v4.9

Name

Calibrated prediction

Score

Prediction

BayesDel_noAF

Benign

-0.87

CADD

Benign

0.56

(source)

DANN

Benign

0.83

PhyloP100

-4.0

RBP_binding_hub_radar

0.0

RBP_regulation_power_radar

1.7

Mutation Taster

=100/0

polymorphism (auto)

(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

Computational scores

Splicing

Publications

Other links and lift over