rs137852973

Positions:

Variant summary

Our verdict is Pathogenic. Variant got 16 ACMG points: 16P and 0B. PM1PM2PM5PP3_ModeratePP5_Very_Strong

The NM_001122955.4(BSCL2):c.461C>T(p.Ser154Leu) variant causes a missense change involving the alteration of a conserved nucleotide. The variant allele was found at a frequency of 0.00000657 in 152,148 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 Likely pathogenic (★★). Another variant affecting the same amino acid position, but resulting in a different missense (i.e. S154P) has been classified as Pathogenic.

Frequency

Genomes: 𝑓 0.0000066 ( 0 hom., cov: 31)

Consequence

BSCL2
NM_001122955.4 missense

Scores

Clinical Significance

Pathogenic/Likely pathogenic criteria provided, multiple submitters, no conflicts P:12U:1O:1

Conservation

PhyloP100: 7.98

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 16 ACMG points.

PM1

In a topological_domain Lumenal (size 194) in uniprot entity BSCL2_HUMAN there are 12 pathogenic changes around while only 0 benign (100%) in NM_001122955.4

PM2

Very rare variant in population databases, with high coverage;

PM5

Other missense variant is known to change same aminoacid residue: Variant chr11-62702494-A-G is described in Lovd as [Pathogenic].

PP3

MetaRNN computational evidence supports a deleterious effect, 0.895

PP5

Variant 11-62702493-G-A is Pathogenic according to our data. Variant chr11-62702493-G-A is described in ClinVar as [Likely_pathogenic]. Clinvar id is 4544.Status of the report is criteria_provided_multiple_submitters_no_conflicts, 2 stars. Variant chr11-62702493-G-A is described in Lovd as [Pathogenic]. Variant chr11-62702493-G-A is described in Lovd as [Pathogenic].

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
BSCL2	NM_001122955.4 linkuse as main transcript	c.461C>T	p.Ser154Leu	missense_variant	3/11	ENST00000360796.10	NP_001116427.1
HNRNPUL2-BSCL2	NR_037946.1 linkuse as main transcript	n.2981C>T		non_coding_transcript_exon_variant	16/24

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
BSCL2	ENST00000360796.10 linkuse as main transcript	c.461C>T	p.Ser154Leu	missense_variant	3/11	1	NM_001122955.4	ENSP00000354032	A2	Q96G97-4

Frequencies

GnomAD3 genomes

AF:

0.00000657

AC:

AN:

152148

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.00

Gnomad AMI

AF:

0.00

Gnomad AMR

AF:

0.00

Gnomad ASJ

AF:

0.00

Gnomad EAS

AF:

0.000192

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

GnomAD4 exome

Cov.:

GnomAD4 genome

AF:

0.00000657

AC:

AN:

152148

Hom.:

Cov.:

AF XY:

0.00

AC XY:

AN XY:

74318

show subpopulations

Gnomad4 AFR

AF:

0.00

Gnomad4 AMR

AF:

0.00

Gnomad4 ASJ

AF:

0.00

Gnomad4 EAS

AF:

0.000192

Gnomad4 SAS

AF:

0.00

Gnomad4 FIN

AF:

0.00

Gnomad4 NFE

AF:

0.00

Gnomad4 OTH

AF:

0.00

Bravo

AF:

0.00000378

ClinVar

Significance: Pathogenic/Likely pathogenic

Submissions summary: Pathogenic:12Uncertain:1Other:1

Revision: criteria provided, multiple submitters, no conflicts

LINK: link

Submissions by phenotype

not provided

Pathogenic:5

Pathogenic, no assertion criteria provided	clinical testing	Clinical Genetics, Academic Medical Center	-	- -
Pathogenic, criteria provided, single submitter	clinical testing	Mayo Clinic Laboratories, Mayo Clinic	Feb 02, 2023	PP1_strong, PP3, PM1, PM2, PM6, PS4_very_strong -
Pathogenic, criteria provided, single submitter	clinical testing	Athena Diagnostics	Aug 04, 2020	Not found in the total gnomAD dataset, and the data is high quality. Found in at least one patient with expected phenotype for this gene. Predicted to have a damaging effect on the protein. Assessment of experimental evidence regarding the effect of this variant on protein function is inconclusive. Strong co-segregation with disease, and data include affected and unaffected individuals from multiple families. One de novo case with parental identity confirmed plus 2 unconfirmed cases. -
Pathogenic, no assertion criteria provided	clinical testing	Joint Genome Diagnostic Labs from Nijmegen and Maastricht, Radboudumc and MUMC+	-	- -
Pathogenic, criteria provided, single submitter	clinical testing	GeneDx	Jul 26, 2021	Published functional studies indicate that S90L inhibits protein glycosylation (Windpassinger et al., 2004) which results in a misfolding of seipin in the endoplasmic reticulum leading to cell death through ER stress (Ito and Suzuki, 2007); Not observed at significant frequency in large population cohorts (gnomAD); This variant is associated with the following publications: (PMID: 21957196, 18325928, 27549087, 28668300, 14981520, 20806400, 17387721, 26815532, 26989944, 27862672, 28362824, 27027447, 31211173, 31372974, 30835347, 32489946, 34504732, 18790819, 11479539, 25487175, 17486577, 27738760, 24604904, 33726816) -

Hereditary spastic paraplegia 17

Pathogenic:2Other:1

Likely pathogenic, no assertion criteria provided	clinical testing	Foundation for Research in Genetics and Endocrinology, FRIGE's Institute of Human Genetics	Oct 23, 2017	Variant c.461C>T (p.S154L) has not been reported in 1000 genomes and ExAC databases. The in silico prediction of the variant are possibly damaging by PolyPhen-2 and damaging by SIFT and MutationTaster2. -
not provided, no classification provided	literature only	GeneReviews	-	- -
Pathogenic, no assertion criteria provided	literature only	OMIM	Sep 01, 2010	- -

Abnormal central motor function

Pathogenic:1

Likely pathogenic, criteria provided, single submitter

clinical testing

Kariminejad - Najmabadi Pathology & Genetics Center

Jul 10, 2021

- -

BSCL2-related disorder

Pathogenic:1

Pathogenic, criteria provided, single submitter

clinical testing

Women's Health and Genetics/Laboratory Corporation of America, LabCorp

Aug 21, 2024

Variant summary: BSCL2 c.269C>T (p.Ser90Leu) results in a non-conservative amino acid change in the encoded protein sequence. Five of five in-silico tools predict a damaging effect of the variant on protein function. The variant was absent in 251342 control chromosomes. c.269C>T has been reported at a heterozygous state in the literature in multiple individuals affected with inherited neuropathy, either arising de novo (Felice_2021), or segregating with disease in a large faimily with inherited neuropathy (Klein_2014). These data indicate that the variant is very likely to be associated with disease. To our knowledge, no experimental evidence demonstrating an impact on protein function has been reported. The following publications have been ascertained in the context of this evaluation (PMID: 34232518, 24604904). ClinVar contains an entry for this variant (Variation ID: 4544). Based on the evidence outlined above, the variant was classified as pathogenic. -

Charcot-Marie-Tooth disease type 2

Pathogenic:1

Pathogenic, criteria provided, single submitter

clinical testing

Labcorp Genetics (formerly Invitae), Labcorp

Jan 12, 2024

This sequence change replaces serine, which is neutral and polar, with leucine, which is neutral and non-polar, at codon 90 of the BSCL2 protein (p.Ser90Leu). This variant is not present in population databases (gnomAD no frequency). This missense change has been observed in individual(s) with BSCL2-related neuropathy, including Silver syndrome, distal hereditary motor neuropathy V, and Charcot-Marie-Tooth disease 2 (PMID: 14981520, 17486577, 24604904, 25487175, 26815532). In at least one individual the variant was observed to be de novo. It has also been observed to segregate with disease in related individuals. ClinVar contains an entry for this variant (Variation ID: 4544). Advanced modeling of protein sequence and biophysical properties (such as structural, functional, and spatial information, amino acid conservation, physicochemical variation, residue mobility, and thermodynamic stability) performed at Invitae indicates that this missense variant is expected to disrupt BSCL2 protein function with a positive predictive value of 80%. Experimental studies have shown that this missense change affects BSCL2 function (PMID: 14981520, 17387721, 21957196, 26815532). For these reasons, this variant has been classified as Pathogenic. -

Neuronopathy, distal hereditary motor, type 5C

Pathogenic:1

Pathogenic, no assertion criteria provided

literature only

OMIM

Sep 01, 2010

- -

Hereditary spastic paraplegia 17;CN031873:Neuronopathy, distal hereditary motor, type 5A

Pathogenic:1

Pathogenic, no assertion criteria provided

research

Department of Rehabilitation Medicine, Incheon St. Mary’s Hospital, College of Medicine, The Catholic University of Korea

Feb 11, 2019

- -

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

AlphaMissense

Benign

0.26

BayesDel_addAF

Pathogenic

0.42

BayesDel_noAF

Pathogenic

0.36

CADD

Pathogenic

DANN

Pathogenic

1.0

DEOGEN2

Pathogenic

0.85

.;.;.;D;D;D;.;D;D

Eigen

Pathogenic

0.79

Eigen_PC

Pathogenic

0.78

FATHMM_MKL

Uncertain

0.96

LIST_S2

Uncertain

0.92

D;D;D;.;.;D;D;D;D

M_CAP

Uncertain

0.12

MetaRNN

Pathogenic

0.90

D;D;D;D;D;D;D;D;D

MetaSVM

Uncertain

0.71

MutationAssessor

Uncertain

2.7

.;M;.;M;M;M;.;.;.

MutationTaster

Benign

1.0

A;A;A;A;A;A;A

PrimateAI

Uncertain

0.57

PROVEAN

Uncertain

-4.0

D;D;D;D;D;D;D;D;D

REVEL

Pathogenic

0.81

Sift

Uncertain

0.018

D;D;D;D;D;D;D;D;D

Sift4G

Uncertain

0.011

D;D;D;D;D;D;.;.;.

Polyphen

0.99, 1.0

.;D;.;D;D;D;.;.;.

Vest4

0.75

MVP

0.97

ClinPred

0.99

GERP RS

5.6

Varity_R

0.46

gMVP

0.72

Splicing

Name

Calibrated prediction

Score

Prediction

SpliceAI score (max)

0.010

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