11-71444928-T-C

Position:

• chr11-71444928-T-C

Variant summary

Our verdict is Likely benign. Variant got -2 ACMG points: 2P and 4B. PM2 BP4_Strong

The NM_001360.3(DHCR7):​c.25A>G​(p.Ile9Val) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.00000205 in 1,461,892 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. 14/21 in silico tools predict a benign outcome for this variant. No clinical diagnostic laboratories have submitted clinical-significance assessments for this variant to ClinVar.

• Frequency:
  • Genomes: not found (cov: 33)
  • Exomes 𝑓: 0.0000021 (0 hom.)
• Consequence: DHCR7 NM_001360.3 missense
• Clinical Significance: Not reported in ClinVar
• Conservation: PhyloP100: -0.556

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 (HGNC:):

ACMG classification

Verdict is Likely_benign. Variant got -2 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• BP4: Computational evidence support a benign effect (MetaRNN=0.038606733).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
DHCR7	NM_001360.3	c.25A>G	p.Ile9Val	missense_variant	3/9	ENST00000355527.8	NP_001351.2
DHCR7	NM_001163817.2	c.25A>G	p.Ile9Val	missense_variant	3/9		NP_001157289.1
DHCR7	XM_011544777.3	c.25A>G	p.Ile9Val	missense_variant	3/9

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
DHCR7	ENST00000355527.8	c.25A>G	p.Ile9Val	missense_variant	3/9	1	NM_001360.3	ENSP00000347717.4
DHCR7	ENST00000685320.1	c.-333-867A>G		intron_variant				ENSP00000509319.1

Frequencies

GnomAD3 genomes Cov.: 33

GnomAD3 exomes AF: 0.00000398 AC: 1 AN: 251490 Hom.: 0 AF XY: 0.00 AC XY: 0 AN XY: 135916

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: 0.00000879

Gnomad OTH exome AF: 0.00

GnomAD4 exome AF: 0.00000205 AC: 3 AN: 1461892 Hom.: 0 Cov.: 32 AF XY: 0.00000275 AC XY: 2 AN XY: 727248

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: 0.00000270

Gnomad4 OTH exome AF: 0.00

GnomAD4 genome Cov.: 33

ExAC AF: 0.00000824 AC: 1

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Benign	0.060
BayesDel_addAF	Uncertain	0.019	T
BayesDel_noAF	Benign	-0.21
CADD	Benign	0.056
DANN	Benign	0.31
DEOGEN2	Benign	0.39	T;T;.;T;T;T;T
Eigen	Benign	-1.8
Eigen_PC	Benign	-1.8
FATHMM_MKL	Benign	0.0042	N
LIST_S2	Benign	0.36	.;T;T;T;T;T;T
M_CAP	Benign	0.018	T
MetaRNN	Benign	0.039	T;T;T;T;T;T;T
MetaSVM	Uncertain	0.043	D
MutationAssessor	Benign	-1.5	N;N;.;.;.;.;.
PrimateAI	Benign	0.25	T
PROVEAN	Benign	0.010	N;N;N;N;N;N;N
REVEL	Uncertain	0.39
Sift	Benign	1.0	T;T;T;T;T;T;T
Sift4G	Benign	0.67	T;T;.;.;T;.;T
Polyphen		0.0	B;B;.;.;.;.;.
Vest4		0.13
MutPred		0.091		Gain of MoRF binding (P = 0.1247);Gain of MoRF binding (P = 0.1247);Gain of MoRF binding (P = 0.1247);Gain of MoRF binding (P = 0.1247);Gain of MoRF binding (P = 0.1247);Gain of MoRF binding (P = 0.1247);Gain of MoRF binding (P = 0.1247);
MVP		0.60
MPC		0.098
ClinPred		0.013	T
GERP RS		-4.6
RBP_binding_hub_radar		0.0
RBP_regulation_power_radar		1.7
Varity_R		0.010
gMVP		0.27

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

Other links and lift over

dbSNP: rs115595829; hg19: chr11-71155974;