rs281797256

Positions:

• chr1-54865405-C-G

Variant summary

Our verdict is Uncertain significance. Variant got 2 ACMG points: 2P and 0B. PM2

The NM_014762.4(DHCR24):​c.918G>C​(p.Lys306Asn) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.00000752 in 1,461,894 control chromosomes in the GnomAD database, with no homozygous occurrence. Variant has been reported in ClinVar as no classification for the single variant (no stars).

• Frequency:
  • Genomes: not found (cov: 32)
  • Exomes 𝑓: 0.0000075 (0 hom.)
• Consequence: DHCR24 NM_014762.4 missense
• Clinical Significance: Not reported in ClinVar
• Conservation: PhyloP100: 2.58

Genes affected

DHCR24 (HGNC:2859): (24-dehydrocholesterol reductase) This gene encodes a flavin adenine dinucleotide (FAD)-dependent oxidoreductase which catalyzes the reduction of the delta-24 double bond of sterol intermediates during cholesterol biosynthesis. The protein contains a leader sequence that directs it to the endoplasmic reticulum membrane. Missense mutations in this gene have been associated with desmosterolosis. Also, reduced expression of the gene occurs in the temporal cortex of Alzheimer disease patients and overexpression has been observed in adrenal gland cancer cells. [provided by RefSeq, Jul 2008]

ACMG classification

Verdict is Uncertain_significance. Variant got 2 ACMG points.

• PM2: Very rare variant in population databases, with high coverage

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
DHCR24	NM_014762.4	c.918G>C	p.Lys306Asn	missense_variant	6/9	ENST00000371269.9

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
DHCR24	ENST00000371269.9	c.918G>C	p.Lys306Asn	missense_variant	6/9	1	NM_014762.4	P1

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome AF: 0.00000752 AC: 11 AN: 1461894 Hom.: 0 Cov.: 35 AF XY: 0.00000825 AC XY: 6 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: 0.00000899

Gnomad4 OTH exome AF: 0.0000166

GnomAD4 genome Cov.: 32

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Pathogenic	0.82
BayesDel_addAF	Uncertain	0.058	T
BayesDel_noAF	Benign	-0.16
CADD	Uncertain	24
DANN	Uncertain	1.0
DEOGEN2	Uncertain	0.71	D;D;.;D
Eigen	Benign	-0.094
Eigen_PC	Benign	0.027
FATHMM_MKL	Uncertain	0.90	D
LIST_S2	Uncertain	0.97	.;.;D;D
M_CAP	Benign	0.082	D
MetaRNN	Uncertain	0.67	D;D;D;D
MetaSVM	Uncertain	0.055	D
MutationAssessor	Uncertain	2.6	M;M;.;M
MutationTaster	Benign	1.0	D;D;D
PrimateAI	Uncertain	0.77	T
PROVEAN	Uncertain	-3.0	.;D;.;.
REVEL	Uncertain	0.41
Sift	Benign	0.083	.;T;.;.
Sift4G	Benign	0.17	.;T;.;.
Polyphen		0.27	B;B;.;B
Vest4		0.89
MutPred		0.82		Loss of methylation at K306 (P = 5e-04);Loss of methylation at K306 (P = 5e-04);Loss of methylation at K306 (P = 5e-04);Loss of methylation at K306 (P = 5e-04);
MVP		0.88
MPC		0.53
ClinPred		0.84	D
GERP RS		4.1
Varity_R		0.33
gMVP		0.85

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: rs281797256; hg19: chr1-55331078;