Genetic Variant NDE1:c.-340T>G (chr16-15643753-T-G) – ACMG Classification: Likely_benign (-2 pts)

Variant summary

Our verdict is Likely benign. The variant received -2 ACMG points: 2P and 4B. PM2BP4_Strong

The ENST00000674888.1(NDE1):n.-218T>G variant causes a non coding transcript exon change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.0000163 in 61,476 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. No clinical diagnostic laboratories have submitted clinical-significance assessments for this variant to ClinVar.

Frequency

Genomes: not found (cov: 32)

Exomes 𝑓: 0.000016 ( 0 hom. )

Consequence

NDE1
ENST00000674888.1 non_coding_transcript_exon

Scores

Clinical Significance

Not reported in ClinVar

Conservation

PhyloP100: -0.265

Publications

0 publications found

Variant links:

Genes affected

NDE1 (HGNC:17619): (nudE neurodevelopment protein 1) This gene encodes a member of the nuclear distribution E (NudE) family of proteins. The encoded protein is localized at the centrosome and interacts with other centrosome components as part of a multiprotein complex that regulates dynein function. This protein plays an essential role in microtubule organization, mitosis and neuronal migration. Mutations in this gene cause lissencephaly 4, a disorder characterized by lissencephaly, severe brain atrophy, microcephaly, and severe cognitive disability. Alternative splicing results in multiple transcript variants. [provided by RefSeq, Mar 2012]

NDE1 Gene-Disease associations (from GenCC):

lissencephaly 4
Inheritance: AR Classification: DEFINITIVE, STRONG, MODERATE Submitted by: PanelApp Australia, Ambry Genetics, G2P, Labcorp Genetics (formerly Invitae), Laboratory for Molecular Medicine
hydranencephaly
Inheritance: AR Classification: SUPPORTIVE Submitted by: Orphanet
microlissencephaly
Inheritance: AR Classification: SUPPORTIVE Submitted by: Orphanet
NDE1-related microhydranencephaly
Inheritance: Unknown, AR Classification: SUPPORTIVE, LIMITED Submitted by: Labcorp Genetics (formerly Invitae), Orphanet

NDE1 links:

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ACMG classification

Classification was made for transcript

Our verdict: Likely_benign. The variant received -2 ACMG points.

PM2

Very rare variant in population databases, with high coverage;

BP4

Computational evidence support a benign effect (BayesDel_noAF=-0.79).

Transcripts

RefSeq

Gene	Transcript	HGVSc	Effect	Exon rank	Protein	UniProt
NDE1	NM_001143979.2 link	c.-340T>G	5_prime_UTR_variant	Exon 1 of 10	NP_001137451.1	Q9NXR1-2X5DR54
NDE1	XM_006720897.5 link	c.-122T>G	5_prime_UTR_variant	Exon 1 of 8	XP_006720960.1
NDE1	XM_047434258.1 link	c.-122T>G	5_prime_UTR_variant	Exon 1 of 8	XP_047290214.1

Ensembl

Gene	Transcript	HGVSc	Effect	Exon rank	TSL	Protein	UniProt
NDE1	ENST00000396355.5 link	c.-340T>G	5_prime_UTR_variant	Exon 1 of 10	1	ENSP00000379643.1	Q9NXR1-2
NDE1	ENST00000674888.1 link	n.-218T>G	non_coding_transcript_exon_variant	Exon 1 of 10		ENSP00000501936.1	Q9NXR1-2
NDE1	ENST00000674888.1 link	n.-218T>G	5_prime_UTR_variant	Exon 1 of 10		ENSP00000501936.1	Q9NXR1-2

Frequencies

GnomAD3 genomes

Cov.:

GnomAD4 exome

AF:

0.0000163

AC:

AN:

61476

Hom.:

Cov.:

AF XY:

0.00

AC XY:

AN XY:

33470

show subpopulations

⚠️ The allele balance in gnomAD version 4 Exomes is significantly skewed from the expected value of 0.5.

African (AFR)

AF:

0.00

AC:

AN:

290

American (AMR)

AF:

0.00

AC:

AN:

308

Ashkenazi Jewish (ASJ)

AF:

0.00

AC:

AN:

1358

East Asian (EAS)

AF:

0.00

AC:

AN:

214

South Asian (SAS)

AF:

0.00

AC:

AN:

13884

European-Finnish (FIN)

AF:

0.00

AC:

AN:

3952

Middle Eastern (MID)

AF:

0.00

AC:

AN:

234

European-Non Finnish (NFE)

AF:

0.0000264

AC:

AN:

37864

Other (OTH)

AF:

0.00

AC:

AN:

3372

⚠️ The allele balance in gnomAD4 Exomes is highly skewed from 0.5 (p-value = 0.000000), which strongly suggests a high chance of mosaicism in these individuals.

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.325

Heterozygous variant carriers

0.00

0.20

0.40

0.60

0.80

0.95

Allele balance

GnomAD4 genome

Cov.:

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

BayesDel_noAF

Benign

-0.79

CADD

Benign

8.2

(source)

DANN

Benign

0.71

PhyloP100

-0.27

PromoterAI

-0.052

Neutral

(source)

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

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Variant summary

Frequency

Consequence

Scores

Clinical Significance

Conservation

Publications

ACMG classification

Transcripts

RefSeq

Ensembl

Frequencies

ClinVar

Computational scores

Splicing

Publications

Other links and lift over