chr8-142876242-G-C

Variant names:

• chr8-142876242-G-C
• rs104894061
• NM_000497.4:c.953C>G

Variant summary

Our verdict is Pathogenic. The variant received 11 ACMG points: 11P and 0B. PM1 PM5 PP2 PP3_Strong PP5_Moderate

The NM_000497.4(CYP11B1):​c.953C>G​(p.Thr318Arg) variant causes a missense, splice region change. The variant allele was found at a frequency of 0.0000171 in 1,461,840 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a pathogenic outcome for this variant. 3/3 splice prediction tools predict no significant impact on normal splicing. Variant has been reported in ClinVar as Pathogenic (★). Another variant affecting the same amino acid position, but resulting in a different missense (i.e. T318M) has been classified as Pathogenic.

• Frequency:
  • Genomes: not found (cov: 33)
  • Exomes 𝑓: 0.000017 (0 hom.)
• Consequence: CYP11B1 NM_000497.4 missense, splice_region
• Scores: Splicing: ADA: 0.04217
• Clinical Significance: Pathogenic criteria provided, single submitter P:2
• Conservation: PhyloP100: 4.03
• Publications: 16 publications found

Genes affected

CYP11B1 (HGNC:2591): (cytochrome P450 family 11 subfamily B member 1) This gene encodes a member of the cytochrome P450 superfamily of enzymes. The cytochrome P450 proteins are monooxygenases which catalyze many reactions involved in drug metabolism and synthesis of cholesterol, steroids and other lipids. This protein localizes to the mitochondrial inner membrane and is involved in the conversion of progesterone to cortisol in the adrenal cortex. Mutations in this gene cause congenital adrenal hyperplasia due to 11-beta-hydroxylase deficiency. Transcript variants encoding different isoforms have been noted for this gene. [provided by RefSeq, Jul 2008]

GML (HGNC:4375): (glycosylphosphatidylinositol anchored molecule like) Predicted to be involved in DNA damage response, signal transduction by p53 class mediator resulting in cell cycle arrest; apoptotic process; and negative regulation of cell population proliferation. Predicted to be extrinsic component of membrane. [provided by Alliance of Genome Resources, Apr 2022]

ACMG classification

Our verdict: Pathogenic. The variant received 11 ACMG points.

• PM1: In a hotspot region, there are 3 aminoacids with missense pathogenic changes in the window of +-8 aminoacids around while only 0 benign, 7 uncertain in NM_000497.4
• PM5: Other missense variant is known to change same aminoacid residue: Variant chr8-142876242-G-A is described in ClinVar as Pathogenic. ClinVar VariationId is 1173.Status of the report is criteria_provided_multiple_submitters_no_conflicts, 2 stars.
• PP2: Missense variant in the gene, where a lot of missense mutations are associated with disease in ClinVar. The gene has 45 curated pathogenic missense variants (we use a threshold of 10). The gene has 9 curated benign missense variants. Gene score misZ: -1.5619 (below the threshold of 3.09). Trascript score misZ: -0.26962 (below the threshold of 3.09). GenCC associations: The gene is linked to glucocorticoid-remediable aldosteronism, congenital adrenal hyperplasia due to 11-beta-hydroxylase deficiency.
• PP3: MetaRNN computational evidence supports a deleterious effect, 0.992
• PP5: Variant 8-142876242-G-C is Pathogenic according to our data. Variant chr8-142876242-G-C is described in ClinVar as Pathogenic. ClinVar VariationId is 556549.Status of the report is criteria_provided_single_submitter, 1 stars.

Variant Effect in Transcripts

ACMG analysis was done for transcript: NM_000497.4. You can select a different transcript below to see updated ACMG assignments.

RefSeq Transcripts

Selected	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	CYP11B1	NM_000497.4	MANE Select	c.953C>G	p.Thr318Arg	missense splice_region	Exon 5 of 9	NP_000488.3
	CYP11B1	NM_001026213.1		c.953C>G	p.Thr318Arg	missense splice_region	Exon 5 of 8	NP_001021384.1

Ensembl Transcripts

Selected	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	CYP11B1	ENST00000292427.10	TSL:1 MANE Select	c.953C>G	p.Thr318Arg	missense splice_region	Exon 5 of 9	ENSP00000292427.5
	CYP11B1	ENST00000377675.3	TSL:1	c.1166C>G	p.Thr389Arg	missense splice_region	Exon 7 of 11	ENSP00000366903.3
	CYP11B1	ENST00000517471.5	TSL:1	c.953C>G	p.Thr318Arg	missense splice_region	Exon 5 of 8	ENSP00000428043.1

Frequencies

GnomAD3 genomes Cov.: 33

GnomAD2 exomes AF: 0.00000398 AC: 1 AN: 251354 AF XY: 0.00

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 FIN exome AF: 0.00

Gnomad NFE exome AF: 0.00000880

Gnomad OTH exome AF: 0.00

GnomAD4 exome AF: 0.0000171 AC: 25 AN: 1461840 Hom.: 0 Cov.: 33 AF XY: 0.0000220 AC XY: 16 AN XY: 727224

African (AFR) AF: 0.00 AC: 0 AN: 33478

American (AMR) AF: 0.00 AC: 0 AN: 44724

Ashkenazi Jewish (ASJ) AF: 0.00 AC: 0 AN: 26136

East Asian (EAS) AF: 0.00 AC: 0 AN: 39700

South Asian (SAS) AF: 0.00 AC: 0 AN: 86256

European-Finnish (FIN) AF: 0.00 AC: 0 AN: 53418

Middle Eastern (MID) AF: 0.00 AC: 0 AN: 5734

European-Non Finnish (NFE) AF: 0.0000225 AC: 25 AN: 1112000

Other (OTH) AF: 0.00 AC: 0 AN: 60394

GnomAD4 genome Cov.: 33

Alfa AF: 0.00000428 Hom.: 0

ClinVar

Significance: Pathogenic

Submissions summary: Pathogenic:2

Revision: criteria provided, single submitter

Submissions by phenotype

Deficiency of steroid 11-beta-monooxygenase Pathogenic:1

Feb 06, 2018

Counsyl

Significance: Likely pathogenic

Review Status: no assertion criteria provided

Collection Method: clinical testing

This submission and the accompanying classification are no longer maintained by the submitter. For more information on current observations and classification, please contact variantquestions@myriad.com.

not provided Pathogenic:1

Jul 30, 2023

Labcorp Genetics (formerly Invitae), Labcorp

Significance: Pathogenic

Review Status: criteria provided, single submitter

Collection Method: clinical testing

This sequence change replaces threonine, which is neutral and polar, with arginine, which is basic and polar, at codon 318 of the CYP11B1 protein (p.Thr318Arg). This variant is not present in population databases (gnomAD no frequency). This missense change has been observed in individual(s) with congenital adrenal hyperplasia due to 11β-hydroxylase deficiency (PMID: 9435454, 16046588, 26476331, 28228528). In at least one individual the data is consistent with being in trans (on the opposite chromosome) from a pathogenic variant. ClinVar contains an entry for this variant (Variation ID: 556549). An algorithm developed to predict the effect of missense changes on protein structure and function (PolyPhen-2) suggests that this variant is likely to be disruptive. This variant disrupts the p.Thr318 amino acid residue in CYP11B1. Other variant(s) that disrupt this residue have been determined to be pathogenic (PMID: 8506298, 10487675). This suggests that this residue is clinically significant, and that variants that disrupt this residue are likely to be disease-causing. For these reasons, this variant has been classified as Pathogenic.

Computational scores

Source: dbNSFP v4.9

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Pathogenic	0.75
BayesDel_addAF	Pathogenic	0.41	D
BayesDel_noAF	Pathogenic	0.35
CADD	Pathogenic	28
DANN	Uncertain	0.99
DEOGEN2	Pathogenic	0.89	D
Eigen	Uncertain	0.32
Eigen_PC	Benign	0.15
FATHMM_MKL	Benign	0.71	D
LIST_S2	Uncertain	0.90	D
M_CAP	Pathogenic	0.66	D
MetaRNN	Pathogenic	0.99	D
MetaSVM	Uncertain	0.76	D
MutationAssessor	Pathogenic	3.2	M
PhyloP100		4.0
PrimateAI	Uncertain	0.77	T
PROVEAN	Pathogenic	-5.6	D
REVEL	Pathogenic	0.85
Sift	Uncertain	0.0010	D
Sift4G	Uncertain	0.018	D
Polyphen		1.0	D
Vest4		0.88
MutPred		0.96		Loss of glycosylation at T390 (P = 0.1162)
MVP		0.95
MPC		0.50
ClinPred		1.0	D
GERP RS		3.2
PromoterAI		-0.017	Neutral
Varity_R		0.97
gMVP		0.93
Mutation Taster		=4/96	disease causing (ClinVar)

Splicing

Name	Calibrated prediction	Score	Prediction
dbscSNV1_ADA	Benign	0.042
dbscSNV1_RF	Benign	0.22
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

Other links and lift over

dbSNP: rs104894061; hg19: chr8-143957658;