chr9-92717947-G-A

Variant names:

Variant summary

Our verdict is Pathogenic. Variant got 14 ACMG points: 14P and 0B. PM1PM2PP3_ModeratePP5_Very_Strong

The NM_001003800.2(BICD2):c.2108C>T(p.Thr703Met) variant causes a missense, splice region change involving the alteration of a conserved nucleotide. The variant allele was found at a frequency of 0.00000124 in 1,612,766 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a pathogenic outcome for this variant. 2/3 splice prediction tools predicting alterations to normal splicing. Variant has been reported in ClinVar as Likely pathogenic (★★).

Frequency

Genomes: 𝑓 0.0000066 ( 0 hom., cov: 33)

Exomes 𝑓: 6.8e-7 ( 0 hom. )

Consequence

BICD2
NM_001003800.2 missense, splice_region

Scores

Splicing: ADA: 0.9769

Clinical Significance

Pathogenic/Likely pathogenic criteria provided, multiple submitters, no conflicts P:7U:1

Conservation

PhyloP100: 9.89

Variant links:

Genes affected

BICD2 (HGNC:17208): (BICD cargo adaptor 2) This gene is one of two human homologs of Drosophila bicaudal-D and a member of the Bicoid family. It has been implicated in dynein-mediated, minus end-directed motility along microtubules. It has also been reported to be a phosphorylation target of NIMA related kinase 8. Two alternative splice variants have been described. [provided by RefSeq, Jul 2008]

BICD2 links:

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ACMG classification

Classification made for transcript

Verdict is Pathogenic. Variant got 14 ACMG points.

PM1

In a coiled_coil_region (size 142) in uniprot entity BICD2_HUMAN there are 6 pathogenic changes around while only 1 benign (86%) in NM_001003800.2

PM2

Very rare variant in population databases, with high coverage;

PP3

MetaRNN computational evidence supports a deleterious effect, 0.896

PP5

Variant 9-92717947-G-A is Pathogenic according to our data. Variant chr9-92717947-G-A is described in ClinVar as [Likely_pathogenic]. Clinvar id is 55858.Status of the report is criteria_provided_multiple_submitters_no_conflicts, 2 stars. Variant chr9-92717947-G-A is described in Lovd as [Likely_pathogenic].

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
BICD2	NM_001003800.2 link	c.2108C>T	p.Thr703Met	missense_variant, splice_region_variant	Exon 6 of 7	ENST00000356884.11	NP_001003800.1	Q8TD16-2Q96FU2
BICD2	NM_015250.4 link	c.2108C>T	p.Thr703Met	missense_variant, splice_region_variant	Exon 6 of 8		NP_056065.1	Q8TD16-1Q96FU2
BICD2	XM_017014551.2 link	c.2189C>T	p.Thr730Met	missense_variant, splice_region_variant	Exon 6 of 8		XP_016870040.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
BICD2	ENST00000356884.11 link	c.2108C>T	p.Thr703Met	missense_variant, splice_region_variant	Exon 6 of 7	1	NM_001003800.2	ENSP00000349351.6		Q8TD16-2
BICD2	ENST00000375512.3 link	c.2108C>T	p.Thr703Met	missense_variant, splice_region_variant	Exon 6 of 8	1		ENSP00000364662.3		Q8TD16-1

Frequencies

GnomAD3 genomes

AF:

0.00000657

AC:

AN:

152228

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.0000241

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:

0.00000399

AC:

AN:

250388

Hom.:

AF XY:

0.00

AC XY:

AN XY:

135396

show subpopulations

Gnomad AFR exome

AF:

0.0000616

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:

0.00

Gnomad OTH exome

AF:

0.00

GnomAD4 exome

AF:

6.85e-7

AC:

AN:

1460538

Hom.:

Cov.:

AF XY:

0.00000138

AC XY:

AN XY:

726622

show subpopulations

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:

9.00e-7

Gnomad4 OTH exome

AF:

0.00

GnomAD4 genome

AF:

0.00000657

AC:

AN:

152228

Hom.:

Cov.:

AF XY:

0.00

AC XY:

AN XY:

74360

show subpopulations

Gnomad4 AFR

AF:

0.0000241

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

Alfa

AF:

0.0000526

Hom.:

Bravo

AF:

0.00000378

ESP6500AA

AF:

0.000227

AC:

ESP6500EA

AF:

0.00

AC:

ExAC

AF:

0.00000824

AC:

ClinVar

Significance: Pathogenic/Likely pathogenic

Submissions summary: Pathogenic:7Uncertain:1

Revision: criteria provided, multiple submitters, no conflicts

LINK: link

Submissions by phenotype

Autosomal dominant childhood-onset proximal spinal muscular atrophy with contractures

Pathogenic:4Uncertain:1

Jan 06, 2016

Inherited Neuropathy Consortium Ii, University Of Miami

Significance: Uncertain significance

Review Status: no assertion criteria provided

Collection Method: literature only

- -

Jun 06, 2013

OMIM

Significance: Pathogenic

Review Status: no assertion criteria provided

Collection Method: literature only

- -

Oct 17, 2024

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 methionine, which is neutral and non-polar, at codon 703 of the BICD2 protein (p.Thr703Met). This variant is present in population databases (rs371707778, gnomAD 0.004%). This missense change has been observed in individual(s) with clinical features of BICD2-related conditions (PMID: 23664116, 27784775, 28635954; internal data). In at least one individual the variant was observed to be de novo. ClinVar contains an entry for this variant (Variation ID: 55858). 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. Experimental studies have shown that this missense change affects BICD2 function (PMID: 23664116, 27784775, 29528393). For these reasons, this variant has been classified as Pathogenic. -

Institute of Human Genetics, University Hospital of Duesseldorf

Significance: Pathogenic

Review Status: criteria provided, single submitter

Collection Method: not provided

- -

Genomics England Pilot Project, Genomics England

Significance: Likely pathogenic

Review Status: no assertion criteria provided

Collection Method: clinical testing

- -

not provided

Pathogenic:2

Nov 02, 2023

Mayo Clinic Laboratories, Mayo Clinic

Significance: Likely pathogenic

Review Status: criteria provided, single submitter

Collection Method: clinical testing

PP1, PS3, PS4_moderate -

Jan 14, 2025

GeneDx

Significance: Pathogenic

Review Status: criteria provided, single submitter

Collection Method: clinical testing

Published functional studies demonstrate a damaging effect: abnormal protein localization, increased Golgi fragmentation, and increased microtuble stability (PMID: 29528393, 23664116); Not observed at significant frequency in large population cohorts (gnomAD); In silico analysis supports that this missense variant has a deleterious effect on protein structure/function; This variant is associated with the following publications: (PMID: 27784775, 33369814, 23664116, 28635954, 35982159, 34758253, 33057194, 29528393) -

Inborn genetic diseases

Pathogenic:1

Dec 08, 2022

Ambry Genetics

Significance: Likely pathogenic

Review Status: criteria provided, single submitter

Collection Method: clinical testing

The c.2108C>T (p.T703M) alteration is located in exon 6 (coding exon 6) of the BICD2 gene. This alteration results from a C to T substitution at nucleotide position 2108, causing the threonine (T) at amino acid position 703 to be replaced by a methionine (M). Based on data from gnomAD, the T allele has an overall frequency of 0.001% (2/281794) total alleles studied. The highest observed frequency was 0.004% (1/24960) of African alleles. This alteration was detected in multiple individuals with features consistent with lower extremity-predominant spinal muscular atrophy 2 (Storbeck, 2017; Unger, 2016; Neveling, 2013). This amino acid position is highly conserved in available vertebrate species. Multiple functional assays show aberrant protein function and mis-localization of protein in vitro and in vivo (Unger, 2016; Neveling, 2013; Martinez Carrera, 2018). The in silico prediction for this alteration is inconclusive. Based on the available evidence, this alteration is classified as likely pathogenic. -

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

AlphaMissense

Pathogenic

0.89

BayesDel_addAF

Pathogenic

0.17

BayesDel_noAF

Pathogenic

0.18

CADD

Pathogenic

DANN

Uncertain

1.0

DEOGEN2

Pathogenic

0.87

.;D

Eigen

Pathogenic

0.78

Eigen_PC

Pathogenic

0.69

FATHMM_MKL

Uncertain

0.95

LIST_S2

Pathogenic

0.99

D;D

M_CAP

Uncertain

0.17

MetaRNN

Pathogenic

0.90

D;D

MetaSVM

Uncertain

-0.19

MutationAssessor

Pathogenic

3.4

M;M

PrimateAI

Pathogenic

0.85

PROVEAN

Pathogenic

-5.4

D;D

REVEL

Uncertain

0.51

Sift

Uncertain

0.0010

D;D

Sift4G

Pathogenic

0.0010

D;D

Polyphen

1.0

D;D

Vest4

0.94

MVP

0.91

MPC

1.5

ClinPred

0.99

GERP RS

5.2

RBP_binding_hub_radar

0.0

RBP_regulation_power_radar

1.7

Varity_R

0.60

gMVP

0.70

Splicing

Name

Calibrated prediction

Score

Prediction

dbscSNV1_ADA

Pathogenic

0.98

dbscSNV1_RF

Pathogenic

0.72

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

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