rs587777606

Variant summary

Our verdict is Pathogenic. Variant got 18 ACMG points: 18P and 0B. PVS1PM2PP5_Very_Strong

The NM_001122955.4(BSCL2):c.985C>T(p.Arg329Ter) variant causes a stop gained change. The variant allele was found at a frequency of 0.0000118 in 1,613,974 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a pathogenic outcome for this variant. Variant has been reported in ClinVar as Pathogenic (★★). Variant results in nonsense mediated mRNA decay.

Frequency

Genomes: 𝑓 0.0000066 ( 0 hom., cov: 32)

Exomes 𝑓: 0.000012 ( 0 hom. )

Consequence

BSCL2
NM_001122955.4 stop_gained

Scores

Clinical Significance

Pathogenic criteria provided, multiple submitters, no conflicts P:3U:1O:1

Conservation

PhyloP100: 3.85

Variant links:

Genes affected

BSCL2 (HGNC:15832): (BSCL2 lipid droplet biogenesis associated, seipin) This gene encodes the multi-pass transmembrane protein protein seipin. This protein localizes to the endoplasmic reticulum and may be important for lipid droplet morphology. Mutations in this gene have been associated with congenital generalized lipodystrophy type 2 or Berardinelli-Seip syndrome, a rare autosomal recessive disease characterized by a near absence of adipose tissue and severe insulin resistance. Alternatively spliced transcript variants encoding different isoforms have been found for this gene. Naturally occurring read-through transcription occurs between this locus and the neighboring locus HNRNPUL2 (heterogeneous nuclear ribonucleoprotein U-like 2).[provided by RefSeq, Mar 2011]

BSCL2 links:

HNRNPUL2-BSCL2 (HGNC:):

HNRNPUL2-BSCL2 links:

Genome browser will be placed here

ACMG classification

Classification made for transcript

Verdict is Pathogenic. Variant got 18 ACMG points.

PVS1

Loss of function variant, product undergoes nonsense mediated mRNA decay. LoF is a known mechanism of disease.

PM2

Very rare variant in population databases, with high coverage;

PP5

Variant 11-62691300-G-A is Pathogenic according to our data. Variant chr11-62691300-G-A is described in ClinVar as [Pathogenic]. Clinvar id is 143858.Status of the report is criteria_provided_multiple_submitters_no_conflicts, 2 stars. Variant chr11-62691300-G-A is described in Lovd as [Pathogenic].

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
BSCL2	NM_001122955.4 linkuse as main transcript	c.985C>T	p.Arg329Ter	stop_gained	7/11	ENST00000360796.10
HNRNPUL2-BSCL2	NR_037946.1 linkuse as main transcript	n.3505C>T		non_coding_transcript_exon_variant	20/24

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
BSCL2	ENST00000360796.10 linkuse as main transcript	c.985C>T	p.Arg329Ter	stop_gained	7/11	1	NM_001122955.4	A2	Q96G97-4

Frequencies

GnomAD3 genomes

AF:

0.00000657

AC:

AN:

152092

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.0000242

Gnomad AMI

AF:

0.00

Gnomad AMR

AF:

0.00

Gnomad ASJ

AF:

0.00

Gnomad EAS

AF:

0.00

Gnomad SAS

AF:

0.00

Gnomad FIN

AF:

0.00

Gnomad MID

AF:

0.00

Gnomad NFE

AF:

0.00

Gnomad OTH

AF:

0.00

GnomAD3 exomes

AF:

0.00000398

AC:

AN:

251404

Hom.:

AF XY:

0.00000736

AC XY:

AN XY:

135904

show subpopulations

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:

0.0000462

Gnomad NFE exome

AF:

0.00

Gnomad OTH exome

AF:

0.00

GnomAD4 exome

AF:

0.0000123

AC:

AN:

1461882

Hom.:

Cov.:

AF XY:

0.00000963

AC XY:

AN XY:

727244

show subpopulations

Gnomad4 AFR exome

AF:

0.0000299

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:

0.0000187

Gnomad4 NFE exome

AF:

0.0000144

Gnomad4 OTH exome

AF:

0.00

GnomAD4 genome

AF:

0.00000657

AC:

AN:

152092

Hom.:

Cov.:

AF XY:

0.0000135

AC XY:

AN XY:

74294

show subpopulations

Gnomad4 AFR

AF:

0.0000242

Gnomad4 AMR

AF:

0.00

Gnomad4 ASJ

AF:

0.00

Gnomad4 EAS

AF:

0.00

Gnomad4 SAS

AF:

0.00

Gnomad4 FIN

AF:

0.00

Gnomad4 NFE

AF:

0.00

Gnomad4 OTH

AF:

0.00

ExAC

AF:

0.00000824

AC:

ClinVar

Significance: Pathogenic

Submissions summary: Pathogenic:3Uncertain:1Other:1

Revision: criteria provided, multiple submitters, no conflicts

LINK: link

Submissions by phenotype

Congenital generalized lipodystrophy type 2

Pathogenic:1Other:1

Pathogenic, criteria provided, single submitter	clinical testing	Mendelics	May 28, 2019	- -
not provided, no classification provided	literature only	GeneReviews	-	- -

Severe neurodegenerative syndrome with lipodystrophy

Pathogenic:1

Pathogenic, no assertion criteria provided

literature only

OMIM

Jun 01, 2013

- -

Charcot-Marie-Tooth disease type 2

Pathogenic:1

Pathogenic, criteria provided, single submitter

clinical testing

Invitae

Oct 22, 2018

For these reasons, this variant has been classified as Pathogenic. Loss-of-function variants in BSCL2 are known to be pathogenic (PMID: 11479539). Experimental studies have shown that this nonsense change alters splicing, protein aggregation and oligomerization (PMID: 23564749, 26282322). This variant has been observed to be homozygous or on the opposite chromosome (in trans) from other pathogenic variants in individuals affected with BSCL2-related progressive encephalopathy with or without lipodystrophy (PMID: 23564749,¬†27452399). This finding is consistent with autosomal recessive inheritance, and suggests that this variant contributes to disease. This variant is also known as c.985C>T (p.Arg329*) in the literature. ClinVar contains an entry for this variant (Variation ID: 143858). This variant is present in population databases (rs587777606, ExAC 0.001%). This sequence change creates a premature translational stop signal (p.Arg265*) in the BSCL2 gene. It is expected to result in an absent or disrupted protein product. -

Berardinelli-Seip congenital lipodystrophy

Uncertain:1

Uncertain significance, no assertion criteria provided

literature only

Inherited Neuropathy Consortium Ii, University Of Miami

Jan 06, 2016

- -

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

BayesDel_addAF

Pathogenic

0.62

BayesDel_noAF

Pathogenic

0.55

Cadd

Pathogenic

Dann

Uncertain

1.0

Eigen

Uncertain

0.38

Eigen_PC

Benign

0.19

FATHMM_MKL

Pathogenic

0.97

MutationTaster

Benign

1.0

A;A;A;A;A;A;D

Vest4

0.90, 0.89, 0.89, 0.89

GERP RS

1.9

RBP_binding_hub_radar

0.0

RBP_regulation_power_radar

1.1

Splicing

Name

Calibrated prediction

Score

Prediction

SpliceAI score (max)

0.090

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

Below is the list of publications found by LitVar. It may be empty.

Variant summary

Frequency

Consequence

Scores

Clinical Significance

Conservation

ACMG classification

Transcripts

RefSeq

Ensembl

Frequencies

ClinVar

Submissions by phenotype

Computational scores

Splicing

Publications

LitVar

Other links and lift over