11-71437869-G-T

Variant names:

• chr11-71437869-G-T
• rs80338858
• NM_001360.3:c.906C>A

Variant summary

Our verdict is Pathogenic. The variant received 19 ACMG points: 19P and 0B. PS1_Very_Strong PM1 PM2 PM5 PP3_Strong PP5

The NM_001360.3(DHCR7):​c.906C>A​(p.Phe302Leu) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant was absent in control chromosomes in GnomAD project. In-silico tool predicts a pathogenic outcome for this variant. Variant has been reported in ClinVar as Likely pathogenic (no stars). Another nucleotide change resulting in the same amino acid substitution has been previously reported as Likely pathogenic in ClinVar. Another variant affecting the same amino acid position, but resulting in a different missense (i.e. F302V) has been classified as Likely pathogenic.

• Frequency: Genomes: not found (cov: 34)
• Consequence: DHCR7 NM_001360.3 missense
• Clinical Significance: Likely pathogenic no assertion criteria provided P:1
• Conservation: PhyloP100: -0.0670
• Publications: 0 publications found

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: Orphanet, G2P, Myriad Women’s Health, Laboratory for Molecular Medicine, ClinGen, Labcorp Genetics (formerly Invitae)

ACMG classification

Our verdict: Pathogenic. The variant received 19 ACMG points.

• PS1: Transcript NM_001360.3 (DHCR7) is affected with MISSENSE_VARIANT having same AA change as one Pathogenic present in ClinVar.
• PM1: In a hotspot region, there are 11 aminoacids with missense pathogenic changes in the window of +-8 aminoacids around while only 0 benign, 6 uncertain in NM_001360.3
• PM2: Very rare variant in population databases, with high coverage
• PM5: Other missense variant is known to change same aminoacid residue: Variant chr11-71437871-A-C is described in ClinVar as Likely_pathogenic. ClinVar VariationId is 2812732.Status of the report is criteria_provided_single_submitter, 1 stars.
• PP3: MetaRNN computational evidence supports a deleterious effect, 0.964
• PP5: Variant 11-71437869-G-T is Pathogenic according to our data. Variant chr11-71437869-G-T is described in ClinVar as Likely_pathogenic. ClinVar VariationId is 4065882.Status of the report is no_assertion_criteria_provided, 0 stars.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
DHCR7	NM_001360.3	c.906C>A	p.Phe302Leu	missense_variant	Exon 8 of 9	ENST00000355527.8	NP_001351.2

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
DHCR7	ENST00000355527.8	c.906C>A	p.Phe302Leu	missense_variant	Exon 8 of 9	1	NM_001360.3	ENSP00000347717.4
DHCR7	ENST00000685320.1	c.321C>A	p.Phe107Leu	missense_variant	Exon 7 of 8			ENSP00000509319.1

Frequencies

GnomAD3 genomes Cov.: 34

GnomAD4 exome Cov.: 32

GnomAD4 genome Cov.: 34

Alfa AF: 0.000238 Hom.: 1

ClinVar

Significance: Likely pathogenic

Submissions summary: Pathogenic:1

Revision: no assertion criteria provided

Submissions by phenotype

Smith-Lemli-Opitz syndrome Pathogenic:1

Jan 29, 2025

Natera, Inc.

Significance: Likely pathogenic

Review Status: no assertion criteria provided

Collection Method: clinical testing

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Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Pathogenic	1.0
BayesDel_addAF	Pathogenic	0.32	D
BayesDel_noAF	Pathogenic	0.22
CADD	Benign	14
DANN	Uncertain	0.99
DEOGEN2	Pathogenic	0.98	D;D;D;D
Eigen	Benign	-0.45
Eigen_PC	Benign	-0.63
FATHMM_MKL	Benign	0.50	D
LIST_S2	Uncertain	0.96	.;D;D;D
M_CAP	Pathogenic	0.47	D
MetaRNN	Pathogenic	0.96	D;D;D;D
MetaSVM	Pathogenic	1.0	D
MutationAssessor	Uncertain	2.5	M;M;.;.
PhyloP100		-0.067
PrimateAI	Pathogenic	0.87	D
PROVEAN	Pathogenic	-5.2	D;D;D;D
REVEL	Pathogenic	0.72
Sift	Uncertain	0.0080	D;D;D;D
Sift4G	Uncertain	0.0060	D;D;D;D
Polyphen		1.0	D;D;.;.
Vest4		0.91
MutPred		0.90		Loss of helix (P = 0.3949);Loss of helix (P = 0.3949);.;.;
MVP		0.88
MPC		0.60
ClinPred		1.0	D
GERP RS		-4.4
RBP_binding_hub_radar		0.0
RBP_regulation_power_radar		1.7
Varity_R		0.78
gMVP		0.92
Mutation Taster		=3/97	disease causing

Splicing

Name	Calibrated prediction	Score	Prediction
SpliceAI score (max)		0.050		Details are displayed if max score is > 0.2

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

Other links and lift over

dbSNP: rs80338858; hg19: chr11-71148915;